i want to share the global data across activities and i have followed
this link
.but i am not getting how to declare it in my manifest. i am posting my manifest code, i have tried it in different ways, but still getting the error. please tell me how to resolve it.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.helloandroid"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7" />
<application android:icon="#drawable/icon" android:label="#string/app_name"
android:name=".Myapp">
<activity android:name=".AndroidtestActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
This is my main activity
public class AndroidtestActivity extends Activity
{
/** Called when the activity is first created. */
public static final String PREFS_NAME = "MyPrefsFile";
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
EditText et = (EditText) findViewById(R.id.text1);
Myapp appState = ((Myapp)getApplicationContext());
String s= appState.getState();
et.setText(s);
}
}
and my Myapp class is
class Myapp extends Application {
private String myState;
public String getState(){
return myState;
}
public void setState(String s){
myState = "hello world";
}
}
i am getting error in the line
Myapp appState = ((Myapp)getApplicationContext());
illegal access exception ,please tell me how to resolve this problem
please help me with this.
Merge the application tags (i.e. put the android:name in the first one and delete the rest):
<application android:icon="#drawable/icon" android:label="#string/app_name"
android:name=".MyApp">
<activity android:name=".AndroidtestActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Then use getApplication() instead of getApplicationContext().
Related
I want to send and receive remote notification through Firebase but my custom class could not find getApplicationContext() method.
From my understanding, FirebaseMessagingService extends Service, which extendsContextWrapper` which extends Context.
So I don't know getApplicationContext() is not working. Any help will be appreciated!
import com.google.firebase.messaging.FirebaseMessagingService;
import com.google.firebase.messaging.RemoteMessage;
public class FirebaseMessageService extends FirebaseMessagingService {
#Override
public void onMessageReceived(RemoteMessage remoteMessage) {
if(remoteMessage.getNotification() != null){
String title = remoteMessage.getNotification().getTitle();
String text = remoteMessage.getNotification().getBody();
NotificationHelper.displayNotification(getApplicationContext(), title, text);
}
super.onMessageReceived(remoteMessage);
}
}
Here's my AndroidManifest.xml file.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mealz">
<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.NoActionBar">
<activity android:name=".Activities.UserActivity"></activity>
<activity android:name=".Activities.LoginActivity" />
<activity android:name=".Activities.SignupActivity" />
<activity android:name=".Activities.SearchRecipeActivity" />
<activity android:name=".Activities.RecipeDetailActivity" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".Notifications.FirebaseMessageService">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT" />
</intent-filter>
</service>
</application>
</manifest>
You can achieve this in many way one way is to keep a weak refrence of context make a app class extending android.app.application and on it's create method and make a variable of weak refrence of context and assign it to getApplicationContext() and you may use this context anywhere you want.
public class app extends android.app.Application{
private static WeakReference<Context> referenceCntx;
#Override
public void onCreate() {
super.onCreate();
referenceCntx = new WeakReference<>(getApplicationContext());
}
public static Context getApplicationCntx(){
return referenceCntx.get();
}
}
And don't forget to add this line in manifest
<application
android:name=".app"
First off, I know this has been asked before and I have gone through many many posts regarding this. Unfortunately, my case seems to be a bit different. Most of the posts advised to remove the permission statement from application tag. This, unfortunately, does not help my situation, as I do not have permissions inside the application tag. I would very much appreciate any assistance.
Here is my AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.jonasSoftware.blueharvest"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme">
<activity
android:name="com.jonasSoftware.blueharvest.LoginActivity"
android:label="#string/app_name"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.jonasSoftware.blueharvest.ChargeActivity"
android:label="#string/title_activity_charge" >
</activity>
<activity
android:name="com.google.zxing.client.android.CaptureActivity"
android:configChanges="orientation|keyboardHidden"
android:screenOrientation="landscape"
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
android:windowSoftInputMode="stateAlwaysHidden" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
<intent-filter>
<action android:name="com.google.zxing.client.android.SCAN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name="com.jonasSoftware.blueharvest.HomeActivity"
android:label="Home" >
</activity>
<activity
android:name="com.jonasSoftware.blueharvest.ConfigActivity"
android:label="Config" >
</activity>
<activity
android:name="com.jonasSoftware.blueharvest.SettingsActivity"
android:label="Settings" >
</activity>
<activity android:name=".WebServiceDemo" android:label="WebServiceDemo"/>
<activity android:name=".UploadActivity"/>
<activity android:name=".TransferActivity"/>
<activity android:name=".ReceivePO"/>
<activity android:name=".LoginActivity"/>
</application>
</manifest>
The LoginActivity, if needed, is below. For testing purposes, it just starts the HomeActivity intent, with the majority of the code being commented out.
public class LoginActivity extends Activity {
// JSON Response node names
private static String KEY_SUCCESS = "success";
private static String KEY_ERROR = "error";
private static String KEY_ERROR_MSG = "error_msg";
private static String KEY_UID = "uid";
private static String KEY_NAME = "name";
private static String KEY_USERNAME = "username";
private static String KEY_CREATED_AT = "created_at";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
setTitle("onas Scanner Login");
final Button loginBtn = (Button) findViewById(R.id.btnLogin);
final EditText loginUsername = (EditText) findViewById(R.id.loginUsername);
final EditText loginPassword = (EditText) findViewById(R.id.loginPassword);
final TextView loginErrorMsg = (TextView) findViewById(R.id.login_error);
loginBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//do stuff
String username = loginUsername.getText().toString();
String password = loginPassword.getText().toString();
Intent homeActivity = new Intent(getApplicationContext(), HomeActivity.class);
homeActivity.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(homeActivity);
}
});
}
}
If any other information is required, please let me know.
So as I was about to post this, I realized what my mistake was. Looking through the Manifest again I noticed something interesting. The application did not originally have the LoginActivity. When I added the LoginActivity, the following line was added to the Manifest.
<activity android:name=".LoginActivity"/>
I did not know this at the time and so just edited the original launcher activity, as seen below.
<activity
android:name="com.jonasSoftware.blueharvest.LoginActivity"
android:label="#string/app_name"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
the android:name= line had originally been "com.jonasSoftware.blueharvest.HomeActivity". So when I removed the extra line from the Manifest, everything started working again.
I hope this helps someone.
Brad.
In my application I need to process physical button events such as volume button clicks. For that I'm using audiomanager's registerMediaButtonEventReceiver method. There's an article relevant to my situation, though I can't get it working.
Here's code I'm using:
public class VolumeBroadcastActivity extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
AudioManager manager = (AudioManager) getSystemService(AUDIO_SERVICE);
manager.registerMediaButtonEventReceiver(new ComponentName(getPackageName(), RemoteControlReceiver.class.getName()));
}
public class RemoteControlReceiver extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(VolumeBroadcastActivity.this, "1",1).show();
if (Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction())) {
}
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="localhost.volume.broadcast"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:name=".VolumeBroadcastActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="RemoteControlReceiver">
<intent-filter>
<action android:name="android.intent.action.MEDIA_BUTTON" />
</intent-filter>
</receiver>
</application>
</manifest>
Your RemoteControlReceiver class is an inner class of VolumeBroadcastActivity. Your manifest doesn't say so and I don't think it could. Make it a regular class and precede its android:name with a dot.
You might need this permission (declare in manifest):
uses-permission android:name="android.permission.BLUETOOTH"
I'm trying to make a home screen. I've got the widget to display but I need to send some kind of notify to it so it will start. Perhaps I'm missing something in the AndroidManifest.xml?
AndroidManifest.xml:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Fredrik" android:versionCode="1" android:versionName="1.0">
<uses-permission android:name="android.permission.INTERNET" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".HomeScreen" android:label="#string/app_name"
android:launchMode="singleInstance" android:stateNotNeeded="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
HomeScreen.java:
public class HomeScreen extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final AppWidgetManager widgets = AppWidgetManager
.getInstance(getApplicationContext());
List<AppWidgetProviderInfo> installedProviders = widgets
.getInstalledProviders();
for (AppWidgetProviderInfo ws : installedProviders) {
if (ws.label.startsWith("Music (Large)")) {
AppWidgetHost h = new AppWidgetHost(getApplicationContext(), 10);
int id = h.allocateAppWidgetId();
AppWidgetHostView v= h.createView(this, id, ws);
setContentView(v);
h.startListening();
break;
}
}
}
}
Does anyone have a clue?
According to this post, you cannot program widget insertion yourself: http://groups.google.com/group/android-developers/browse_thread/thread/e4a5b4a87afcf707?pli=1
You have to call an intend that will give the user the ability to pick.
I was still surprised to hear you managed to get it to display...
I'm trying to implement search functionality in my app, which is very basic at the moment. When I press the search button on my Nexus, the search intent seems to not fire because neither onCreate() nor onNewIntent() gets called. I have basically copied the whole example you can find on Android developers, but it is still not working. Thanks for your help
res/searchable.xml
<?xml version="1.0" encoding="utf-8"?>
<searchable xmlns:android="http://schemas.android.com/apk/res/android"
android:label="hello"
android:hint="Search lectures" >
</searchable>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.openday.lectures"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".LecturesListActivity"
android:label="#string/app_name"
android:launchMode="singleTop">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<intent-filter>
<action android:name="android.intent.action.SEARCH" />
</intent-filter>
<meta-data android:name="android.app.searchable"
android:resource="#xml/searchable"/>
</activity>
<activity android:name=".SingleLectureActivity"
android:label="Lecture">
</activity>
</application>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
</manifest>
LecturesListActivity.java (shortened)
public class LecturesListActivity extends ListActivity {
private String categoryDisplayed;
private String facultyDisplayed;
private List<Lecture> lectures;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
loadLectures();
displayFaculties();
}
#Override
protected void onNewIntent(Intent intent) {
setIntent(intent);
handleIntent(intent);
}
private void handleIntent(Intent intent) {
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
searchForLectures(query);
}
}
}
Problem with constant string in searchable.xml, same answer as this question