Widget for turning on/off camera flashlight in android
I am developing a widget for turning on/off camera led of phone.
I have made a widget that can work like toggle button (on/off).
Behavior is like follows : Sometimes the led light remains on when i enable the widget. But it doesnot turn on/off the camera led but it changes the icon.
I am not able to figure out whats the actual problem.
The same thing works fine in Activity (Torch Light Application).
Can anyone please explain me how can i solve my problem ?
Where i am going wrong ?
You can look at the code below that i have done so far
onUpdate method
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
//super.onUpdate(context, appWidgetManager, appWidgetIds);
remoteViews = new RemoteViews( context.getPackageName(), R.layout.widgetlayout);
watchWidget = new ComponentName( context, FlashLightWidget.class );
Intent intentClick = new Intent(context,FlashLightWidget.class);
intentClick.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, ""+appWidgetIds[0]);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, appWidgetIds[0],intentClick, 0);
remoteViews.setOnClickPendingIntent(R.id.myToggleWidget, pendingIntent);
appWidgetManager.updateAppWidget( watchWidget, remoteViews );
ctx=context;
}
onReceive method is as follows :
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
remoteViews = new RemoteViews( context.getPackageName(), R.layout.widgetlayout);
if (intent.getAction()==null) {
Bundle extras = intent.getExtras();
if(extras!=null) {
if(status)
{
status=false;
remoteViews.setImageViewResource(R.id.myToggleWidget, R.drawable.shutdown1);
processOnClick();
Toast.makeText(context,"Status==false-onclick",Toast.LENGTH_SHORT).show();
}
else
{
status = true;
remoteViews.setImageViewResource(R.id.myToggleWidget, R.drawable.shutdown2);
processOffClick();
Toast.makeText(context,"Status==true--Ofclick",Toast.LENGTH_SHORT).show();
}
}
watchWidget = new ComponentName( context, FlashLightWidget.class );
(AppWidgetManager.getInstance(context)).updateAppWidget( watchWidget, remoteViews );
}
}
}
processOffClick method
private void processOffClick() {
if (mCamera != null) {
mCamera.stopPreview();
mCamera.setPreviewCallback(null);
mCamera.release();
mCamera = null;
}
}
processOnClick method
private void processOnClick() {
if(mCamera==null)
{
try {
mCamera = Camera.open();
} catch (Exception e) {
e.printStackTrace();
}
}
if (mCamera != null) {
Parameters params = mCamera.getParameters();
List<String> flashModes = params.getSupportedFlashModes();
if (flashModes == null) {
return;
} else {
params.setFlashMode(Parameters.FLASH_MODE_OFF);
mCamera.setParameters(params);
mCamera.startPreview();
String flashMode = params.getFlashMode();
if (!Parameters.FLASH_MODE_TORCH.equals(flashMode)) {
if (flashModes.contains(Parameters.FLASH_MODE_TORCH)) {
params.setFlashMode(Parameters.FLASH_MODE_TORCH);
mCamera.setParameters(params);
}
}
}
} else if (mCamera == null) {
//Toast.makeText(ctx, "Camera not found", Toast.LENGTH_LONG).show();
return;
}
}
Answer
After a long time, I got free to solve this problem.
Here is what I did.
FlashlightWidgetProvider class :
public class FlashlightWidgetProvider extends AppWidgetProvider {
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds) {
Intent receiver = new Intent(context, FlashlightWidgetReceiver.class);
receiver.setAction("COM_FLASHLIGHT");
receiver.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, receiver, 0);
RemoteViews views = new RemoteViews(context.getPackageName(),
R.layout.widget_layout);
views.setOnClickPendingIntent(R.id.button, pendingIntent);
appWidgetManager.updateAppWidget(appWidgetIds, views);
}
}
and BroadcastReceiver for FlashlightWidgetReceiver :
public class FlashlightWidgetReceiver extends BroadcastReceiver {
private static boolean isLightOn = false;
private static Camera camera;
@Override
public void onReceive(Context context, Intent intent) {
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_layout);
if(isLightOn) {
views.setImageViewResource(R.id.button, R.drawable.off);
} else {
views.setImageViewResource(R.id.button, R.drawable.on);
}
AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context);
appWidgetManager.updateAppWidget(new ComponentName(context, FlashlightWidgetProvider.class),
views);
if (isLightOn) {
if (camera != null) {
camera.stopPreview();
camera.release();
camera = null;
isLightOn = false;
}
} else {
// Open the default i.e. the first rear facing camera.
camera = Camera.open();
if(camera == null) {
Toast.makeText(context, R.string.no_camera, Toast.LENGTH_SHORT).show();
} else {
// Set the torch flash mode
Parameters param = camera.getParameters();
param.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
try {
camera.setParameters(param);
camera.startPreview();
isLightOn = true;
} catch (Exception e) {
Toast.makeText(context, R.string.no_flash, Toast.LENGTH_SHORT).show();
}
}
}
}
}
Permission required in Manifest.xml file :
<uses-permission android:name="android.permission.CAMERA"></uses-permission>
Also register receivers in Manifest.xml file :
<receiver android:name=".FlashlightWidgetProvider" android:icon="@drawable/on" android:label="@string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="@xml/flashlight_appwidget_info" />
</receiver>
<receiver android:name="FlashlightWidgetReceiver">
<intent-filter>
<action android:name="COM_FLASHLIGHT"></action>
</intent-filter>
</receiver>
Important Note : This code works perfect if your phone has FLASH_MODE_TORCH supported.
I have tested in Samsung Galaxy Ace 2.2.1 & 2.3.3. The code is not working because that device has no FLASH_MODE_TORCH.
Works fine in HTC Salsa, Wildfire..
If anyone can test and post results here, it would be best.