Android application - long loading

Android application - long loading - android

I've developed this app, everything works fine, but loading takes 4-5 seconds and I don't know why, because there is no image or internet content to be loaded, just logcat spreads about 500 messages about garbage collector. Can you tell me what am I doing wrong? here's some code:
public class HNappActivity extends SherlockFragmentActivity implements
HeadlinesFragment.OnHeadlineSelectedListener, CABNavLis{
HeadlinesFragment hnHeadlinesFragment;
int hnCatIndex = 0;
int hnArtIndex = 0;
Categories hnCurrentCat;
public String[] Rubriky = null;
int count;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_hnapp);
Rubriky = ((HNapp) this.getApplication()).getRubriky();
count=((HNapp) this.getApplication()).getCount();
hnHeadlinesFragment = (HeadlinesFragment) getSupportFragmentManager().findFragmentById(
R.id.headlines);
hnHeadlinesFragment.setOnHeadlineSelectedListener(this);
hnCatIndex = savedInstanceState == null ? 0 : savedInstanceState.getInt("catIndex", 0);
hnHeadlinesFragment.setSelectable(true);
restoreSelection(savedInstanceState);
}
void restoreSelection(Bundle savedInstanceState) {
if (savedInstanceState != null) {
setNewsCategory(savedInstanceState.getInt("catIndex", 0));
int artIndex = savedInstanceState.getInt("artIndex", 0);
hnHeadlinesFragment.setSelection(artIndex);
OnHeadlineSelected(artIndex);
}
}
activity_hnapp.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment
android:id="#+id/headlines"
android:name="sk.ecopress.hn.android.HeadlinesFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1.03" />
<RelativeLayout
android:id="#+id/relative_layout1"
android:layout_width="match_parent"
android:layout_height="40dp"
android:orientation="horizontal" >
<Button
android:id="#+id/titulka"
android:layout_width="40dp"
android:layout_height="40dp"
android:padding="0dp"
android:layout_alignParentLeft="true"
android:text="#string/titulka" />
<Button
android:id="#+id/sekcie"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_toRightOf="#id/titulka"
android:text="#string/sekcie"
android:padding="0dp" />
<Button
android:id="#+id/bookmarks"
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_toRightOf="#id/sekcie"
android:text="#string/bookmarks"
android:padding="0dp" />
<Button
android:id="#+id/info"
android:layout_width="40dp"
android:layout_height="40dp"
android:padding="0dp"
android:layout_alignParentRight="true"
android:onClick="info"
android:text="#string/info" />
<Button
android:id="#+id/nastavenia"
android:layout_width="40dp"
android:layout_height="40dp"
android:padding="0dp"
android:layout_toLeftOf="#id/info"
android:onClick="settings"
android:text="#string/nastavenia" />
thanks

If the garbage collection is working hard it's because you are creating a lot of garbage :). Run over in debug line by line and see which line gets stuck.
From the code you've posted it's non of the android sdk code that generate this garbage.
My bet would be on the line:
Rubriky = ((HNapp) this.getApplication()).getRubriky();
What does it do? accessing a local file or something?

Related

Filling a layout dynamically crashes the application without errors

When I try to open this new activity through a button on a previous layout the app crashes with no apparent reason.
My code is this :
public class Main3Activity extends AppCompatActivity {
private int limitsImages[] = {R.drawable.onelimits, R.drawable.twolimits, R.drawable.threelimits, R.drawable.fourlimits, R.drawable.fivelimits, R.drawable.sixlimits,
R.drawable.sevenlimits, R.drawable.eightlimits, R.drawable.ninelimits, R.drawable.tenlimits};
private String answersLimits[] = {"-9", "2", "1/10", "1/6", "1/2", "12", "1", "2/3", "5/6", "1/4"};
private String choicesLimits[][] = {{"-19", "19", "-9", "2"},{"0", "-2", "Does not exist", "2"}, {"Does not exist","1/5","0","1/10"},{"1/6","1/5","1/4","1"}
,{"1","1/2","0","Does not exist"},{"0","4","12","10"},{"0","1","1/2","2/3"},{"2/3","1","3/2","0"},{"1","2/6","5/6","4"},{"1/4","1"
,"Does not exist","4"}};
private TextView questionNum;
private TextView questionTxt;
private ImageView questionImage;
private CheckBox choiceOne;
private CheckBox choiceTwo;
private CheckBox choiceThree;
private CheckBox choiceFour;
private static int testIdentifier=0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
questionNum = (TextView) findViewById(R.id.questionNumber);
questionTxt = (TextView) findViewById(R.id.questionText);
questionImage = (ImageView) findViewById(R.id.questionImage);
choiceOne = (CheckBox) findViewById(R.id.choice1);
choiceTwo = (CheckBox) findViewById(R.id.choice2);
choiceThree = (CheckBox) findViewById(R.id.choice3);
choiceFour = (CheckBox) findViewById(R.id.choice4);
//choicesLimits[4][3]=getString(R.string.doesntexist);
//choicesLimits[9][2]=getString(R.string.doesntexist);
startLimitsQuestion(testIdentifier);
}
public void startLimitsQuestion( int questionNum) {
this.questionNum.setText(questionNum+1+"/10");
questionTxt.setText(getString(R.string.limitsQ));
questionImage.setImageResource(limitsImages[questionNum]);
choiceOne.setText(choicesLimits[questionNum][1]);
choiceTwo.setText(choicesLimits[questionNum][2]);
choiceThree.setText(choicesLimits[questionNum][3]);
choiceFour.setText(choicesLimits[questionNum][4]);
}
Sub Question:I have been troubled a bit if my initialization and declaration before the onCreate() method is correct.
edit: Layout file
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:background="#color/colorPrimaryDark"
tools:context="com.example.learnmath.Main2Activity"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button4"
android:background="#color/colorPrimary"
android:textColor="#android:color/black"
android:layout_marginTop="27dp"
android:layout_below="#+id/textView3"
android:layout_alignLeft="#+id/button5"
android:layout_alignStart="#+id/button5"
android:text="#string/quadratics" />
<Button
android:text="#string/derivatives"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button6"
android:background="#color/colorPrimary"
android:textColor="#android:color/black"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="18dp"
android:layout_marginEnd="18dp" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#drawable/timetostart"
android:id="#+id/imageView"
android:layout_alignTop="#+id/button4"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="22dp"
android:layout_above="#+id/button6" />
<Button
android:text="#string/limits"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button5"
android:background="#color/colorPrimary"
android:textColor="#android:color/black"
android:layout_marginTop="35dp"
android:layout_below="#+id/button4"
android:layout_alignLeft="#+id/button6"
android:layout_alignStart="#+id/button6"
android:elevation="0dp"
android:onClick="limitsQuiz" />
<ImageView
android:layout_width="200dp"
android:layout_height="200dp"
app:srcCompat="#drawable/mathtest"
android:id="#+id/imageView2"
android:layout_marginRight="46dp"
android:layout_marginEnd="46dp"
android:layout_alignParentBottom="true"
android:layout_alignRight="#+id/button6"
android:layout_alignEnd="#+id/button6" />
<TextView
android:text="#string/tests"
android:typeface="monospace"
android:textStyle="italic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#android:color/holo_orange_light"
android:id="#+id/textView3"
android:textSize="35sp"
android:shadowColor="#android:color/background_light"
android:layout_alignParentTop="true"
android:layout_alignLeft="#+id/imageView2"
android:layout_alignStart="#+id/imageView2" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="#drawable/index"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/imageView3"
android:onClick="homePage" />
</RelativeLayout>

You said that you clicked and then it crashed. So some problem will be there in the onclick. We need to follow your code from onclick. The above snippet is just showing the first question display and these are correct except the test identifier is not incremented.
Please do post full class code of that snippet. Also do give logcat error
What i could guess is some where the error should be in registering activity to manifest or error durimg onclick where your accessing arrays. May be arrayoutofbounds too.

I have resolved your problem. The app theme you declared in your AndroidManifest.xml is not appropriate. As you are extending the AppCompatActivity in your activity, you need to use the Appcompat theme for your particular activity or application.
Change your current app theme to android:theme="#style/Theme.AppCompat.Light" in AndroidManifest.xml file will resolve your problem.
Note:: Your initialisation and declaration is perfect and your onClick method is not the issue. This AppTheme is the only issue. Tell me if you didn't get me.

Use Firebase crash library to report Crash to detect crash if you are not able to crash in logcate
https://firebase.google.com/docs/crash/

Android - How to "match" the data in mysql after pressed a button

In my project, im going to make a multiple choice type question. I can select the questions and answer from mysql, however, i cant do the "matching" of the answer between input answer and the data from mysql. I tried some solutions but they doesnt work as well. I need a big help on it. Below are my codes.
the java class that make multiple choice
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.normalmode);
new DataAsyncTask().execute();
}
public void onClick(View v){
inputtext = ((Button) v).getText().toString();
tv3 = (TextView)findViewById(R.id.textView3);
tv3.setText(inputtext);
if(inputtext == tv2.getText().toString()){
playerscore +=5;
} else {
playerscore +=1;
}
score.setText("Scores : " + playerscore);
new DataAsyncTask().execute();
}
class DataAsyncTask extends AsyncTask<String, String, String>{
#Override
protected String doInBackground(String... param) {
String result = DBConnector.executeQuery("SELECT * FROM questions ORDER BY RAND( ) LIMIT 1");
return result;
}
#Override
protected void onPostExecute(String result) {
question = (TextView)findViewById(R.id.textView_question);
fchoice = (Button)findViewById(R.id.Btn_choice1);
schoice = (Button)findViewById(R.id.Btn_choice2);
tchoice = (Button)findViewById(R.id.Btn_choice3);
tv2 = (TextView)findViewById(R.id.textView2);
score = (TextView)findViewById(R.id.textView_score);
try {
JSONArray jsonArray = new JSONArray(result);
JSONObject jsonData = jsonArray.getJSONObject(0);
question.setText(jsonData.getString("q_desc"));
fchoice.setText(jsonData.getString("fchoice"));
schoice.setText(jsonData.getString("schoice"));
tchoice.setText(jsonData.getString("tchoice"));
ans = jsonData.getString("q_ans");
tv2.setText(ans);
} catch(Exception e) {
Log.e("log_tag", e.toString());
}
}
}
}
three buttons are sharing same onClick in xml file by using
android:onClick="onClick"
the current problem i faced is that it always return "false" no matter i pressed which button. also, is there any way to store/pass "previous" async task data?
I have tried using internal storage but it doesnt work as well
EDIT:
my xml file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.95" >
<TextView
android:id="#+id/textView_score"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/player_score" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.95" >
<TextView
android:id="#+id/textView_question"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="#string/string_question"
android:textAppearance="?android:attr/textAppearanceMedium" />
<Button
android:id="#+id/Btn_choice3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="#string/third_choice"
android:onClick="onClick" />
<Button
android:id="#+id/Btn_choice2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/Btn_submit"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="#string/second_choice"
android:onClick="onClick" />
<Button
android:id="#+id/Btn_choice1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/Btn_choice2"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="#string/first_choice"
android:onClick="onClick" />
</RelativeLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="TextView" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="#+id/textView1"
android:text="TextView" />
</RelativeLayout>
</LinearLayout
textview2 and textview3 are used to test my output and display them as text

try this if(inputtext.equals(tv2.getText().toString())) instead of if(inputtext == tv2.getText().toString())
becasue the == operator checks to see if the two strings are exactly the same object.
The .equals() method will check if the two strings have the same value.

Android layout help, missing elements

I’m trying to creating a layout that contains a "SurfaceView" at the top with a horizontal toolbar that is section into 3 segments in the bottom, however my SurfaceView which contains camera preview is only the only element that is showing. Please point out the error in my layout xml or provide me the similar layout xml, Thanks.
Below is my layout & updates based on user recommendations
Attempt # 1 (RelativeLayout as root):
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LayoutForPreview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:screenOrientation="portrait" >
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/linearLayoutToolbar"
android:layout_gravity="top"
android:scaleType="fitXY" />
<LinearLayout
android:id="#+id/linearLayoutToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_left" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.68"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_center_toolbar" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_right_landscape_button" />
</LinearLayout>
</RelativeLayout>
Below is my desired GUI look:
Attempt #1 Result , device snapshot , which only shows the SurfaceView:
Snapshot of eclipse GUI tool, which shows what the layout should look like.
Attempt # 2 (LinearLayout as root):
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LayoutForPreview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:screenOrientation="portrait" >
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:scaleType="fitXY"
android:layout_weight="1" />
<LinearLayout
android:id="#+id/linearLayoutToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="bottom" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_left" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.68"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_center_toolbar" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_right_landscape_button" />
</LinearLayout>
</LinearLayout>
Attempt #2 , Result , Device snapshot :
Issues:
1) Toolbar appears on top rather than on bottom
2) Camera preview freezes & app crashes. For some reason LinearLayout causes the Camera error 1001 , and I think its related to preview sizes.
Attempt #3 (Add toolbar programmatically to either Relative or Linear layout in activity onCreate).
LinearLayout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LayoutForPreview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:screenOrientation="portrait" >
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:scaleType="fitXY"
android:layout_weight="1" />
</LinearLayout>
Toolbar defined in separate XML added later via Java code:
<?xml version="1.0" encoding="UTF-8"?>
<!-- LinearLayout that contains toolbar that is divided into 3 sections horizontally , layout_below="#+id/BarcodeScannerFrame-->
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayoutToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_left" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.68"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_center_toolbar" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_right_landscape_button" />
</LinearLayout>
onCreate,onResume,other relevant code snippets of my activity only, the LinearLayout toolbar is added to Linear or Relative layout at runtime:
//import not included
public class ScanVinFromBarcodeActivity extends Activity {
// camera object that is used globally in this activity and also passed
// reference to PreviewSurface inner class
private Camera globalCamera;
private int cameraId = 0;
// bitmap that would created after picture is taken and converted from
// camera bytes
private Bitmap bmpOfTheImageFromCamera = null;
// global flag whether a camera has been detected
private boolean isThereACamera = false;
// layout for this activity
private LinearLayout RelativeLayoutBarcodeScanner= null;
// CameraPreview extends SurfaceView displays preview of images from the
// Camera
private CameraPreview newCameraPreview = null;
// used to inflate the xml layout
private SurfaceView surfaceViewBarcodeScanner = null;
private boolean cameraPreviewing = false;
// this continueToAutomaticallyDecode flag is initially set to TRUE, but
// will be set to FALSE on the first successful decode OR when a crucial
// method in the code process fails or throws an exception
private volatile boolean continueToAutomaticallyDecode = true;
// global flag used to indicate picture taking & decoding is in progress
private volatile boolean takingPictureAndDecodeInprogress = false;
// Bitmap options for bitmap creation from camera picture
BitmapFactory.Options options = null;
// used for samsung galaxy s devices only
private Matrix rotationMatrix90CounterClockWise = null;
// Reader is class from zxing used to decode barcodes
Reader reader = null;
// DecodeHintType hashtable is used to provide help to the zxing Reader
// class
Hashtable<DecodeHintType, Object> decodeHints = null;
//
private boolean onTouchEvent = true;
//
private OrientationEventListener orientationEventListener = null;
// 1 means the screen is PORTRAIT and 2 means screen is LANDSCAPE
private int latestScreenOrientation = 1;
//
Camera.Parameters Flash = null;
//
private String globalVIN = null;
//
private Handler handler = null;
//
private LinearLayout barcodeVinScannerToolbar = null;
public boolean isContinueToAutomaticallyDecode() {
return continueToAutomaticallyDecode;
}
public void setContinueToAutomaticallyDecode(
boolean continueToAutomaticallyDecode) {
this.continueToAutomaticallyDecode = continueToAutomaticallyDecode;
}
public boolean isTakingPictureAndDecodeInprogress() {
return takingPictureAndDecodeInprogress;
}
public void setTakingPictureAndDecodeInprogress(
boolean takingPictureAndDecodeInprogress) {
this.takingPictureAndDecodeInprogress = takingPictureAndDecodeInprogress;
}
/*
* This method , finds FEATURE_CAMERA, opens the camera, set parameters ,
* add CameraPreview to layout, set camera surface holder, start preview
*/
#SuppressLint("InlinedApi")
private void initializeGlobalCamera() {
try {
if (!getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA)) {
Toast.makeText(this, "No camera on this device",
Toast.LENGTH_LONG).show();
} else { // check for front camera ,and get the ID
cameraId = findFrontFacingCamera();
if (cameraId < 0) {
Toast.makeText(this, "No front facing camera found.",
Toast.LENGTH_LONG).show();
} else {
Log.d("ClassScanViewBarcodeActivity",
"camera was found , ID: " + cameraId);
// camera was found , set global camera flag to true
isThereACamera = true;
// OPEN
globalCamera = getGlobalCamera(cameraId);
// parameters auto focus
globalCamera.getParameters().setFocusMode(
Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
// set picture format to JPEG, everytime makesure JPEg
globalCamera.getParameters().setPictureFormat(
ImageFormat.JPEG);
autoFocusSetupForBarcode(globalCamera);
/*
* START early setup variables & setting used in
* jpegCallback in order to optimize the jpegCallback code
*/
options = new BitmapFactory.Options();
// option set for down sampling he captured image taken from
// the camera in order to MemoryOutOfBounds exception
options.inSampleSize = 4;
// image quality rather than speed in order to achieve early
// barcode detection & decode
options.inPreferQualityOverSpeed = false;
// Samsung galaxy S only , rotate to correct orientation
// ,and capture only the image within the guidance rectangle
rotationMatrix90CounterClockWise = new Matrix();
rotationMatrix90CounterClockWise.postRotate(90);
// early variable used by zxing to decode method
decodeHints = new Hashtable<DecodeHintType, Object>();
decodeHints.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
decodeHints.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
decodeHints.put(DecodeHintType.ASSUME_CODE_39_CHECK_DIGIT,
Boolean.TRUE);
reader = new MultiFormatReader();
turnOnFlashlight(globalCamera);
// pass surfaceView to CameraPreview
newCameraPreview = new CameraPreview(this, globalCamera) {
#Override
public boolean onTouchEvent(MotionEvent event) {
Log.d("ClassScanViewBarcodeActivity",
" onTouchEvent(MotionEvent event) ");
onTouchEvent = true;
globalCamera
.autoFocus(autoFocusCallbackForAutomaticScan);
return super.onTouchEvent(event);
}
};
// pass CameraPreview to Layout
RelativeLayoutBarcodeScanner.addView(newCameraPreview);
// give reference SurfaceView to camera object
globalCamera.setPreviewDisplay(surfaceViewBarcodeScanner
.getHolder());
// PREVIEW
if (cameraPreviewing != true) {
globalCamera.startPreview();
}
Log.d("ClassScanViewBarcodeActivity",
"camera opened & previewing");
}
}// end else ,check for front camera
}// end try
catch (Exception exc) {
// in case of exception release resources & cleanup
if (globalCamera != null) {
globalCamera.stopPreview();
cameraPreviewing = false;
globalCamera.setPreviewCallback(null);
globalCamera.release();
globalCamera = null;
options = null;
rotationMatrix90CounterClockWise = null;
reader = null;
}
Log.d("ClassScanViewBarcodeActivity initializeGlobalCamera() exception:",
exc.getMessage());
exc.printStackTrace();
}// end catch
}// end ini
/* this method detect whether the camera flashlight a.k.a torch feature is available to be turned on then turns on the light*/
public void turnOnFlashlight(Camera camera) {
Log.d("ClassScanViewBarcodeActivity",
"turnOnFlashlight(Camera camera )");
boolean flag = false;
Context context = null;
if (camera != null) {
Log.d("ClassScanViewBarcodeActivity",
"turnOnFlashlight() , FEATURE_CAMERA_FLASH: " + flag);
context = RelativeLayoutBarcodeScanner.getContext();
if (context != null) {
flag = context.getPackageManager().hasSystemFeature(
PackageManager.FEATURE_CAMERA_FLASH);
if (flag) {
Flash = camera.getParameters();
Flash.setFlashMode("torch");
camera.setParameters(Flash);
}// end if camera feature is available
else {
Log.d("ClassScanViewBarcodeActivity",
"turnOnFlashlight() , FEATURE_CAMERA_FLASH: "
+ flag);
}
}// end if context not null
}// end camera not null
}// end turnOnFlashlight(Camera camera )
// onCreate, instantiates layouts & surfaceView used for video preview
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_barcode_vin_scanner);
Log.d("ClassScanViewBarcodeActivity", "onCreate ");
// create surfaceView for previewing of camera image
RelativeLayoutBarcodeScanner = (LinearLayout) findViewById(R.id.LayoutForPreview);
surfaceViewBarcodeScanner = (SurfaceView) findViewById(R.id.surfaceViewBarcodeScanner);
barcodeVinScannerToolbar = (LinearLayout) findViewById(R.id.linearLayoutToolbar);
initializeGlobalCamera();
//*****TOOLBAR IS ADDED*****
if (RelativeLayoutBarcodeScanner!=null && barcodeVinScannerToolbar!=null)
{
//surfaceViewBarcodeScanner.addChildrenForAccessibility(list);
RelativeLayoutBarcodeScanner.addView(barcodeVinScannerToolbar);
}
// instantiate orientationEventListener
orientationEventListener = new OrientationEventListener(this,
SensorManager.SENSOR_DELAY_NORMAL) {
#Override
public void onOrientationChanged(int arg0) {
/*
latestScreenOrientation = ScreenUtility
.getScreenOrientation(RelativeLayoutBarcodeScanner.getContext());
Log.d("ClassScanViewBarcodeActivity",
"latestScreenOrientation: " + latestScreenOrientation);
if (orientationEventListener.canDetectOrientation()) {
orientationEventListener.enable();
Log.d("ClassScanViewBarcodeActivity",
"enabled orientationEventListener: "
+ String.valueOf(orientationEventListener
.canDetectOrientation()));
} else {
Log.d("ClassScanViewBarcodeActivity",
"enabled orientationEventListener: "
+ String.valueOf(orientationEventListener
.canDetectOrientation()));
}
*/
}
};
handler = new Handler();
}// end onCreate
#Override
protected void onResume() {
Log.d("ClassScanViewBarcodeActivity, onResume() globalCamera:",
String.valueOf(globalCamera));
initializeGlobalCamera();
//*****TOOLBAR IS ADDED*****
if (RelativeLayoutBarcodeScanner!=null && barcodeVinScannerToolbar!=null)
{
//surfaceViewBarcodeScanner.addChildrenForAccessibility(list);
RelativeLayoutBarcodeScanner.addView(barcodeVinScannerToolbar);
}
if (orientationEventListener != null) {
orientationEventListener.enable();
}
super.onResume();
}
#Override
protected void onStop() {
if (globalCamera != null) {
globalCamera.stopPreview();
cameraPreviewing = false;
globalCamera.setPreviewCallback(null);
globalCamera.release();
globalCamera = null;
}
if (orientationEventListener != null) {
orientationEventListener.disable();
}
super.onStop();
}
#Override
protected void onPause() {
if (globalCamera != null) {
globalCamera.stopPreview();
cameraPreviewing = false;
globalCamera.setPreviewCallback(null);
globalCamera.release();
globalCamera = null;
options = null;
rotationMatrix90CounterClockWise = null;
reader = null;
}
if (orientationEventListener != null) {
orientationEventListener.disable();
}
super.onPause();
}// end onPause()
//other irrelevant code was not included
}//end activity
Attempt #3, result, screen freezes , no particular error or exception reported:
Error log:
**If the eclipse GUI tool shows the desired look , than why is the toolbar still missing??? I would like to have the toolbar in the bottom , preferably using RelativeLayout without any crashes or screen freezes. Any help will be appreciated.
I'm using Samsung Galaxy S3 for testing.
Thanks.**

You wanted something like this?
the layout I used is:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:id="#+id/linearLayoutToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
>
<ImageView
android:id="#+id/imageView1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:src="#drawable/ic_launcher"
/>
<ImageView
android:id="#+id/imageView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:src="#drawable/ic_launcher"
/>
<ImageView
android:id="#+id/imageView3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="center"
android:src="#drawable/ic_launcher"
/>
</LinearLayout>
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/linearLayoutToolbar"
/>
</RelativeLayout>
Please note that, since I didn't have your images in my res/drawable folder, I replaced them with ic_launcher.
Also note that I used an ldpi device running Froyo (API level 2.2). This is why the image is smaller than yours and the UI differs slighthly (...). Anyway, it works at every resolution and with every os version.

Add this to your LinearLayout containing imageView
android:layout_alignParentBottom="true"

What you really want is not to use a Relativelayout but instead use a Linearlayout as your root. Then set the surfaceview weight to 1, something like:
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"/>
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/scanner_bottom_left" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/scanner_bottom_center_toolbar" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/scanner_bottom_right_landscape_button" />
</LinearLayout>

You forgot to tell the surfaceView to be above the linearLayout. Your code will need to look similar to this:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="#+id/linearLayoutToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/scanner_bottom_left" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/scanner_bottom_center_toolbar" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/scanner_bottom_right_landscape_button" />
</LinearLayout>
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/linearLayoutToolbar" />
</RelativeLayout>

Why do you use RelativeLayout as a root layout, I think it is much simplier to use LinearLayou with layout_weight parameter in one of children view:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<SurfaceView
android:layout_weight="1"
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="0dp" />
<!-- LinearLayout that contains toolbar that is divided into 3 sections horizontally -->
<LinearLayout
android:id="#+id/linearLayoutToolbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/scanner_bottom_left" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/scanner_bottom_center_toolbar" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/scanner_bottom_right_landscape_button" />
</LinearLayout>
</LinearLayout>

try changing the layout to this:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LayoutForPreview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:screenOrientation="portrait" >
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_gravity="top"
android:scaleType="fitXY"
android:layout_weight="1" />
<LinearLayout
android:id="#+id/linearLayoutToolbar"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight=".1"
android:orientation="horizontal"
android:layout_gravity="bottom" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_left" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.68"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_center_toolbar" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_right_landscape_button" />
</LinearLayout>

I see a few mistakes in your initial XML
1. In the surfaceview you use:
android:layout_above="#+id/linearLayoutToolbar"
You should use #+id when you create an Id but when you want to make a reference you should only do #id like this:
android:layout_above="#id/linearLayoutToolbar"
2. You can't do a reference to another object that isn't created yet! So you should put the surfaceview below de linearlayout like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/LayoutForPreview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:screenOrientation="portrait" >
<LinearLayout
android:id="#+id/linearLayoutToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_left" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.68"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_center_toolbar" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_right_landscape_button" />
</LinearLayout>
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#id/linearLayoutToolbar"
android:layout_gravity="top"
android:scaleType="fitXY" />
</RelativeLayout>
3. You should add weight to your 3 ImageViews like this:
android:layout_weight="1"

Some small changes in your initial layout will lead to remove the error. You need to use android:layout_height="0dp" , defining 0dp will help your surfaceview to fit in your screen.
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_above="#+id/linearLayoutToolbar"
/>
And I've not found use of below attribute in SurfaceView.
android:layout_gravity="top"
android:scaleType="fitXY"
Checkout this layout designs, how android:layout_height="0dp" works, and how android:layout_width="0dp" works.

I have used that kind of layouts in many apps, and here is how should be your layout. No tricks, no praying for luck, this is just the clean, happy, and always-working way to achieve it
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:screenOrientation="portrait" >
<SurfaceView
android:id="#+id/surfaceViewBarcodeScanner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/linearLayoutToolbar"
android:layout_alignParentTop="true" />
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/linearLayoutToolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_left" />
<ImageView
android:id="#+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="0.68"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_center_toolbar" />
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scaleType="fitXY"
android:src="#drawable/scanner_bottom_right_landscape_button" />
</LinearLayout>
</RelativeLayout>
here you have a preview on one of my apps.
The posted code is adapted to yours so a copy/paste will do it. please note that its everything in a simple file, so you have to change slightly your activity

NullPointerException on Extending a Custom Activity

Have a DashBoardActivity that extends a custom MainActivity but i get NullPointerException when trying to access certain views from the DashBoardActivity. Any idea why this could be happening or something am not seeing here?. Thanks
MainActivity:
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.dashboard_layout);
linearlayout = (LinearLayout)findViewById(R.id.footer_container_id);
actionlayout = (LinearLayout)findViewById(R.id.actionbar_container_id);
mainboard = (ImageView)findViewById(R.id.image_dashboard_id);
dashboard = (ImageView)findViewById(R.id.image_comparison_id);
graph = (ImageView)findViewById(R.id.image_graph_id);
contact = (ImageView)findViewById(R.id.image_contact_id);
actionbar = getSupportActionBar();
actionbarView = getLayoutInflater().inflate(R.layout.actionbar, null);
actionbar.setCustomView(actionbarView, new ActionBar.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
actionbar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
}
public void setSelectedDashBoard(){
mainboard.setSelected(true);
}
DashBoardActivity:
public class DashBoardActivity extends MainActivity implements OnClickListener {
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
int orientation = getResources().getConfiguration().orientation;
sessionmanager = new SessionManager(this);
prefs = getSharedPreferences(PREFS_NAME,0);
String cached_username = prefs.getString(USERNAME, "");
mainboard.setSelected(true); // NullPointerException here.
dashboard_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:orientation="horizontal"
android:id="#+id/footer_container_id"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
<include layout="#layout/footer"></include>
</LinearLayout>
<FrameLayout
android:id="#+id/dashboard_fragment_container_id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#id/footer_container_id"
android:layout_alignParentTop="true">
</FrameLayout>
</RelativeLayout>
part of footer.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/layout_footer_id" android:layout_width="fill_parent"
android:layout_height="wrap_content" android:layout_alignParentBottom="true"
android:background="#292929" android:orientation="horizontal">
<LinearLayout android:id="#+id/ytd_container_id"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_weight="1" android:orientation="vertical">
<ImageView android:id="#+id/image_dashboard_id"
android:layout_width="wrap_content" android:layout_height="wrap_content"
android:layout_gravity="center" android:src="#drawable/footer_icons_ytd" />
<TextView android:id="#+id/ytd_text_id" android:layout_width="match_parent"
android:layout_height="wrap_content" android:layout_gravity="center"
android:layout_marginBottom="5dp" android:layout_marginLeft="5dp"
android:clickable="false" android:paddingLeft="10dp" android:text="Year to Date"
android:textColor="#FFFFFF" android:textSize="10sp">
</TextView>
"
</LinearLayout>
Update
if i use the method setSelectedDashBoard() instead, which i just added from the MainActivity class, i don't get the NullPointerException. don't understand it..

dashboard = (ImageView)findViewById(R.id.image_comparison_id);
the only reason for dashboard to be null is R.id.image_comparison_id does not belongs to R.layout.dashboard_layout

It looks like a typical error of subclass member variable obscuration. You should check if you re-declared the variable dashboard in DashBoardActivity. The subclass is just substituting the inherited variable with a local one which is not initialised.

It is the character " , unless it is a typo.
</TextView>
**"**
</LinearLayout>

android coding force close

here is the code that is giving the force close error running on avd
public class MainActivity extends Activity {
Button magic;
TextView display;
int random;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
magic=(Button)findViewById(R.id.magic);
display=(TextView)findViewById(R.id.textView1);
magic.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
random = (int)Math.ceil(Math.random()*100);
display.setText("your number is"+random);
}
});
}
}
here is the code i am using even if random function or settext is not used application force closes please help
activity_main.xml not giving any error or warning..........
xml file
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/magic8ball"
android:gravity="center"
tools:context=".MainActivity" >
<android.widget.Space
android:id="#+id/space1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="144dp"
android:layout_marginTop="192dp" />
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="131dp"
android:layout_marginTop="171dp"
android:orientation="vertical" >
</LinearLayout>
<Button
android:id="#+id/magic"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="#+id/linearLayout1"
android:layout_toRightOf="#+id/linearLayout1"
android:text="#string/Magic" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/Magic"
android:layout_alignParentRight="true"
android:layout_marginBottom="64dp"
android:layout_marginRight="74dp"
android:text="#string/Ask"
android:textAppearance="? android:attr/textAppearanceLarge"
android:textColor="#EE5533" />
</RelativeLayout>
the xml file is given where the single waring is related to the textview1 when hard coded
since the text is about to change whether it is good to set it on string.xml or hard code it ?????

For what purpose you are using following code.
**<android.widget.Space
android:id="#+id/space1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="144dp"
android:layout_marginTop="192dp" />**
This seems not available.. its working fine in the ICS devices.. but not working in Gingerbread devices.. I think that's the unusable code...

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Android application - long loading - android

Related

Filling a layout dynamically crashes the application without errors

Android - How to "match" the data in mysql after pressed a button

Android layout help, missing elements

NullPointerException on Extending a Custom Activity

android coding force close

Categories

Resources