I'm coding a simple android app where you write in a box your name then click ok and a new page will show your name... The problem is that when you click ok nothing happens.
Here the main activity
public class Click extends Activity implements OnClickListener{
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
String TypedText = (String)MyText.getText().toString();
Intent MyInt = new Intent(this, HelloWorld.class);
MyInt.putExtra("user", TypedText);
this.startActivity(MyInt);
Bundle Retrive = this.getIntent().getExtras();
Retrive.getString("user");
setContentView(R.id.Text);
TextView TextV = (TextView)findViewById(R.id.Text);
TextV.setText("user");
}
android.widget.EditText MyText;
public void OnCreate (Bundle savedInstanceState){
super.onCreate(savedInstanceState);
this.setContentView(R.layout.name_getter);
MyText = (EditText)this.findViewById(R.id.editText1);
this.findViewById(R.id.button1);
android.widget.Button RefBut = (Button)this.findViewById(R.id.button1);
RefBut.setOnClickListener(this);
}
And here the manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="edu.calpoly.android.lab1Sada"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".Click"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="HelloWorld" ></activity>
</application>
</manifest>
Starting the android emulator will launch the first activity click but then the app doesn't show the new view...
I dont know what you are doing but you can send/retrieve data from/to activity to another activity like this way:
For that you need to understand the concept of Intent.
From First activity:
Intent i = new Intent(this, ActivityTwo.class);
i.putExtra("name", "paresh");
i.putExtra("technology", "android");
startActivity(i);
From Second activity:
Bundle extras = getIntent().getExtras();
if (extras == null) {
return;
}
String strName = extras.getString("name");
String strTechnology = extras.getString("technology");
Still for your reference, here is the article to know more about the same: Android Intents
You must pass the text from activity 1 and receive it as bundle in activity 2.
Go through the helloworld program as your first tutorial for android.
Just extending Activity will work. You do not need to mention the entire package of the superclass.
Related
I need my app to check if it's running for first time or not. If it's the first time, then it should launch LoginActivity instead of MainActivity. And if it's not the first run, it should display MainActivity as usual.
I used SharedPreference value to check if it's available, then app decides its not running it's first run.
This is what I've tried so far
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Set default values into settings
PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
// Check if the app is running on its first run
SharedPreferences fRun = getPreferences(MODE_PRIVATE);
if(fRun.getBoolean("firstrun", true)){
SharedPreferences.Editor editX=fRun.edit();
editX.putBoolean("firstrun", false);
editX.apply();
// Login activity stuff here
// Goto login screen
Intent loginIntent=new Intent(getApplicationContext(),LoginActivity.class);
startActivity(loginIntent);
//finish();
} else {
setContentView(R.layout.activity_main);
}
}
}
My problem is, when I run my app, it suddenly crashes and displays message Unfortunately, the app has stopped.
Why does the app crash? Is it because code in my LoginActivity have errors or do I need to first load MainActivity then call LoginActivity?
You can use LoginActivity as LAUNCHER activty and check whether the user is logged in. If yes, start MainActivity.
The AndroidManifest.xml:
<activity
android:name=".LoginActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".MainActivity"/>
And the LoginActivity:
public class LoginActivity extends ActionBarActivity {
private static final String LOGIN_KEY = "LOGIN_KEY";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SharedPreferences pref = getPreferences(Context.MODE_PRIVATE);
if (pref.getBoolean(LOGIN_KEY, false)) {
//has login
startActivity(new Intent(this, MainActivity.class));
//must finish this activity (the login activity will not be shown when click back in main activity)
finish();
}
else {
// Mark login
pref.edit().putBoolean(LOGIN_KEY, true).apply();
// Do something
}
}
}
The MainActivity:
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Do something
}
}
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme"
tools:ignore="GoogleAppIndexingWarning">
<activity android:name=".Activity.MainActivity" />
<activity android:name=".Activity.SignupActivity" />
<activity android:name=".Activity.SigninActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
You need to rearrange your Activity classes a bit I think. It's very simple to decide if your application has run first time or not and launch some Activity based on this decision. I would like to suggest the following architecture.
You can set a LauncherActivity to decide whether you need to start LoginActivity or MainActivity like this:
public class LauncherActivity extends Activity {
private boolean firstLaunch = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent i;
SharedPreferences pref = getSharedPreferences(Constants.ApplicationTag, MODE_PRIVATE);
firstLaunch = pref.getBoolean(Constants.FIRST_LAUNCH, true);
if (firstLaunch) {
i = new Intent(LauncherActivity.this, LoginActivity.class);
startActivity(i);
} else {
i = new Intent(LauncherActivity.this, MainActivity.class);
startActivity(i);
}
finish();
}
}
You have another problem I need to sort out is calling setContentView inside an else statement which is erroneous. You need to put setContentView just after the super.onCreate(savedInstanceState); in any of your Activity.
When you're putting it inside an else statement, the content view may not be set which will cause an application crash.
So remove the checking for first run from MainActivity and move that portion to LauncherActivity which will solve the problem.
The AndroidManifest.xml of the LauncherActivity may look like this
<activity
android:name=".Activities.LauncherActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
I am trying to achieve following case on Android, but no success:
1) Launch Application (Launcher Activity which is a subclass of Base Activity). The Base Activity has code as follows:
///This is in BaseActivity
#Override
public void onCreate(Bundle instance)
{
super.onCreate(instance);
//Config.isLoggedIn() is a static function.
if(! Config.isLoggedIn())
{
////Config.startLoginActivity is a static function
Config.startLoginActivity(this, getIntent());
finish();
}
}
The Config.startLoginActivity functions is defined as
public static void startLoginActivity(final Context ctx, final Intent finishIntent)
{
Intent i = new Intent(ctx, ItemListActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.putExtra("FINISH_INTENT", finishIntent);
ctx.startActivity(i);
}
Now, the ItemListActivity contains a list of Items as {Item1, Item2, Item3}. In ItemListActivity, I am saving the passed "finishIntent" as
///This is ItemListActivity onCreate Method
if(getIntent().hasExtra("FINISH_INTENT"))
mFinishIntent = getIntent().getParcelableExtra("FINISH_INTENT");
and the onItemListSelected method is described as follows :
#Override
public void onItemSelected(String id) {
Config.setLogInState(true);
if(mFinishIntent != null)
{
Log.i("ITEMLISTACTIVITY", "Class Name = " + mFinishIntent.getClass().getName());
Log.i("ITEMLISTACTIVITY", "Starting mFinishIntent Activity");
startActivity(mFinishIntent);
finish();
}
}
But the issue is the Main Activity is not being launched again, Android takes me to the home screen instead. While looking for a solution, I saw that Google I/O app has the same implementation and that works flawlessly but in my case it is not. I am unable to figure it out. Please help.
Thanks in Advance.
Manifest File is as follows :
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.app.myapplication.ItemListActivity"
android:label="#string/app_name" >
</activity>
<activity
android:name="com.app.myapplication.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
Ok Here is a quick help which works for 100 percent which I'm using not mostly but EVERYTIME! you must past it through intent and in your case here it is how it must look like.
Intent intent = new intent(//name of your activity in which you are at the moment.this, //name of activity to which you want to go.class);
startActivity(intent);
Hope this will help
i am developing an application, when the app is open there may be any missed call the notification is displayed,how i hide or remove the notification bar & is there any way to implement it.
i have put all codes like below in my application,
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
and
android:theme="#android:style/Theme.Black.NoTitleBar.Fullscreen"
but i open an activity file using broadcast receiver, then the notification is seen when missed call or message arrives
You can use this code:
public class FullScreen
extends android.app.Activity
{
#Override
public void onCreate(android.os.Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
}
}
I was having the exact same problem as yours, but I hade it for both incoming and outgoing calls. I found the solution for the incoming calls/ missed calls but not yet for the outgoing calls.
What you are going to do is the following: 1.Create a BroadCastReceiver Class to listen to incoming calls with the highest priority:
a.In the Manifest.xml add:
<receiver android:name=".MyPhoneBroadcastReceiver">
<intent-filter android:priority="99999">
<action android:name="android.intent.action.PHONE_STATE" />
</intent-filter>
</receiver>
b.Then the Class
#Override
public void onReceive(final Context context, Intent intent) {
Bundle extras = intent.getExtras();
if (extras != null) {
String state = extras.getString(TelephonyManager.EXTRA_STATE);
final String incomingNumber = extras.getString("incoming_number");
Handler callActionHandler = new Handler();
Runnable runRingingActivity = new Runnable(){
#Override
public void run() {
//Notice the intent, cos u will add intent filter for your class(CustomCallsReceiver)
Intent intentPhoneCall = new Intent("android.intent.action.ANSWER");
intentPhoneCall.putExtra("INCOMING_NUM", incomingNumber);
intentPhoneCall.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intentPhoneCall);
}
};
if (state.equals(TelephonyManager.EXTRA_STATE_RINGING)) {
//increase the delay amount if problem occur something like -the screen didn't show up- that's the key about this method(the delay).
callActionHandler.postDelayed(runRingingActivity, 100);
}
if (state.equals(TelephonyManager.EXTRA_STATE_IDLE)) {
callActionHandler.removeCallbacks(runRingingActivity);
}
}
}
2.a.In the Manifest.xml file add this intent filter for the class you will use as a custome call receiver.
<activity android:name="CustomCallsReceiver" android:noHistory="true" android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.ANSWER" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
2.b.The CustomeCallsReceiver Class:
public class CustomCallsReceiver extends Activity {
private String TAG = "CustomCallsReceiver";
String incomingNumber, caller;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custome_calls_receiver);
TextView number = (TextView) findViewById(R.id.number);
number.setGravity(Gravity.CENTER);
incomingNumber = getIntent().getExtras().getString("INCOMING_NUM");
caller = getCallerName(incomingNumber);
if (caller != null) {
number.setText(caller + "\n" + incomingNumber); } }
3.And finally of course don't forget to add the Theme for not title or notification bar at the Manifest.XML file
<application
android:theme="#android:style/Theme.NoTitleBar.Fullscreen">
You need to set the theme in Android manifest .xml.. .
android:theme="#android:style/Theme.Black.NoTitleBar.Fullscreen"
Hope this will help you..
if you set this as application theme it will give effect all the pages of your app..
<application
android:theme="#android:style/Theme.Black.NoTitleBar.Fullscreen"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
>
I am a newbie to Android development. I am trying to invent a broadcast receiver from my activity.
public class MyReceiver extends BroadcastReceiver{
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context,"ABC", Toast.LENGTH_LONG).show();
Bundle extras = intent.getExtras();
String[] parameters= (String[])intent.getSerializableExtra("parameters");
}
}
my activity is
public class MyActivity extends Activity {
public static String BROADCAST_ACTION="com.kiosk.cbal.CALL_RECEIVER";
/**
* #see android.app.Activity#onCreate(Bundle)
*/
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String parameters = "safdsam,fdsa,fdsa,fdsa,fdsa";
String[] parameters =abc.split(",");
Intent i = new Intent("com.package.MyReceiver");
i.putExtra("parameters", parameters);
sendBroadcast(i);
}
}
My Manifest file is
<?xml version="1.0" encoding="UTF-8"?>
<manifest android:versionCode="1" android:versionName="1.0"
package="com.package" xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk android:minSdkVersion="7"/>
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:label="#string/app_name" android:name="MyActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<receiver android:name="MyReceiver">
<intent-filter>
<action android:name="com.kiosk.cbal.CALL_RECEIVER"/>
</intent-filter>
</receiver>
</application>
<uses-permission android:name="android.permission.BATTERY_STATS"/>
</manifest>
Now how I'll Be able to give a call to broadcast receiver through an activity?
Remove the space from the action name. Use the name when you create the Intent.
Update: The code above still has Intent i = new Intent("com.package.MyReceiver");. It should be Intent i = new Intent("com.kiosk.cbal.CALL_RECEIVER");
Meanwhile, in your manifest the receiver name is specified as <receiver android:name="MyReceiver">. note that android:name must be either a fully qualified class name, or a name relative to the package name. The way PackageManager distinguishes the two is by the presence of a . at the beginning of the name. Thus, with your declaration, PackageManager is most likely attempting to instantiate MyReceiver' instead ofcom.package.MyReceiver`.
In any case, you should check the Android log file for details on what's going wrong with the intent you're broadcasting.
The string that you pass to the Intent constructor must be the same as the string specified for the action element for your receiver in the manifest. You are constructing the Intent with your receiver class name, but your receiver is declared to listen to the VIEW intent instead.
I can't seem to get my extra information to get sent along with an intent. The intent loads the next activity properly, but without the payload.
Caller:
//a list item was clicked
protected void onListItemClick(ListView l, View v, int position, long id)
{
super.onListItemClick(l, v, position, id);
Intent i = new Intent(this, ProgramTracks.class);
i.putExtra("_id", id);
startActivity(i);
}
Receiver:
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.program_tracks);
if( savedInstanceState != null )
{
mDateId = savedInstanceState != null ? savedInstanceState.getLong("_id") : null;
Toast.makeText(this, "ID " + mDateId, Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(this, "Null!", Toast.LENGTH_SHORT).show();
}
}
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.site.android.app"
android:versionCode="1" android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".MainActivity" android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ProgramTracks" android:label="#string/app_name">
</activity>
</application>
</manifest>
I'm not sure what I'm missing, but my if keeps Toasting null.
Edit: If I Toast or Log the id variable that gets putExtra()'d, it is set.
In your original activity, you put "_id" as an extra in your intent, but in the second activity you are attempting to retrieve the long from the savedInstanceState.
Instead you should do something like this:
Intent myIntent = getIntent();
Long id = myIntent.getLongExtra("_id", 0);
Where 0 is the default value if no long is found with the tag "_id".
Here's another question about the difference between getting extras from savedInstanceState and Intents.
And here's the developer page on putting/getting extras in Intents.
getIntent().getExtra() will give you the bundle
Then from bundle you can get the required value
Try this:
Bundle bundle = getIntent().getExtras();
long _id = bundle.getLong("_id");
In your Receiver's onCreate() you need to get the passed variable using
Bundle extras = getIntent().getExtras();
mDateId = extras.getLong("_id");
savedInstance is used only when your Activity is being recreated.
Neeraj was almost right. Use getIntent() to retrieve the data passed with the intent used to start the activity.
mDateId = getIntent().getLongExtra("_id", -1);
savedInstanceState is used to retrieve data saved when the activity is suspended.
try this
Intent i = new Intent(MainActivity.this, ProgramTracks.class);
use mDateId = intent.getLongExtra("_id", -1);
if(mDateId != -1)
Toast.makeText(this, "ID " + mDateId, Toast.LENGTH_SHORT).show();