Develop Reference

How do I programmatically dismiss a crash dialog?

I'm building a DPC (Device Policy Controller), and one of the issues I'm seeing is that while the Play Store and Play Services are being updated, the Google Contact Sync service crashes -- leaving the typical crash dialog on the screen. Since part of the idea of the initial set up process is to have as little user interaction as possible, how can I dismiss this dialog programmatically (since I seem to be pretty much guaranteed that this will happen)?
I've tried dismissing system dialogs...
ctx.sendBroadcast(new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
... but that doesn't seem to do the trick.
Since this is a DPC, anything that requires device ownership/administration is fine.
edit: Usually I have no UI on screen at the time, so if one is necessary please do mention it. Also, preferably the solution should work on at least 6.0+, if not 4.0+.

Try to do it onWindowsFocusChanged method like this for example :
#Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
if (!hasFocus) {
Intent ctx= new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
sendBroadcast(ctx);
}
}
I'm not sure about app crash Dialog but maybe it'll help you

AppErrorDialog can be dismissed by broadcasting ACTION_CLOSE_SYSTEM_DIALOGS if Android version is N.
ctx.sendBroadcast(new Intent(Intent.ACTION_CLOSE_SYSTEM_DIALOGS));
However, AppErrorDialog won't be displayed if phone is locked.
public boolean canShowErrorDialogs() {
return mShowDialogs && !mSleeping && !mShuttingDown
&& mLockScreenShown != LOCK_SCREEN_SHOWN;
} // ActivityManagerService

Please try this code.
try {
Class ActivityManagerNative = Class.forName("android.app.ActivityManagerNative");
Class IActivityManager = Class.forName("android.app.IActivityManager");
Method getDefault = ActivityManagerNative.getMethod("getDefault", null);
Object am = IActivityManager.cast(getDefault.invoke(ActivityManagerNative, null));
Method closeSystemDialogs = am.getClass().getMethod("closeSystemDialogs", String.class);
closeSystemDialogs.invoke(am, "DPC close");
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}

Dropbox Synchronous interrupts

In my Android app, when the following code is successful:
mDbxAcctMgr.startLink(SyncActivity.this,REQUEST_LINK_TO_DBX);
This code runs:
if (ds.getSyncStatus().hasIncoming) {
try {
Map<String, Set<DbxRecord>> mMap = mDatastore
.sync();
dataHasIncoming(mMap); // Inserted into the database
} catch (DbxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
If you close the app while this is occurring, dataHasIncoming(mMap) just inserts part of the data, but loses the rest. Is there any way around this, such as setting a node, or re-opening the synchronization without checking all the data?

how to create the camera object that other apps also use the camera when my app also running?

I am doing a project related to live wallpaper, in that camera was set as wallpaper, so in my app camera was running continuously, if user set camera as wallpaper, after he opening the camera it will shows the camera failed to load error,
so, i am using the following code to avoid this error:
public void onVisibilityChanged(boolean visible) {
if (visible){
try {
mCamera.reconnect();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
else{
try {
mCamera.unlock();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
But my problem is could not unlock the camera object to other apps use the camera.
can any one give me an idea how can i do this?

You cannot access the object used by the native camera app or other apps to access camera. When you create mCamera, you are creating your own object which is used by your app. At a time, only one object can access a particular camera resource, and you have no control over other objects of other apps accessing that camera resource.
If you want avoid the failed to load error, you need to release your camera object before you open another app which uses camera resource. But then I do not think your main objective will be accomplished.

I am using same method with small modifications to solve the issue, i was doing following changes in the code
public void onVisibilityChanged(boolean visible) {
// TODO Auto-generated method stub
super.onVisibilityChanged(visible);
if (visible) {
try {
"open camera object"
}catch (Exception e) {
e.printStackTrace();
}
}else {
try {
"release the camera object"
}catch (RuntimeException e) {
e.printStackTrace();
}
}
}

Try Catch method for open bluetooth function

I made a simple android appication for connect with bluetooth serial device and I want to add closeBT if android not connected maybe the device is out of range because crash.
How do I do this? This code is correct?
protected void onStart() {
super.onStart();
findBT(); //Check if bluettoth enable and paired devices
try {
openBT(); //open sockets,streams
} catch (IOException e) {
e.printStackTrace();
closeBT();
}
}

Try-catch is not for the application logic! It is for doing stuff when something went wrong! You want to use an if-else here, like
if (findBT() != null) { // I don't know what findBT does, but maybe it returns BT-devices
try {
openBT(); //open sockets,streams
} catch (IOException e) {
e.printStackTrace();
// inform the user that a connection could not be established or something similar
}
} else {
// inform the user, that no BT-device was found.
}
you want to use closeBT() for instance when the user or your application decides to disconnect the BT-devices.

How to easily add Exception subclasses into catch?

Let's say I need to add some Exception subclasses into catch, such as these ones
...//
catch (ConnectTimeoutException e) {
e.printStackTrace();
} catch (HttpHostConnectException e) {
e.printStackTrace();
}catch (IOException e) {
e.printStackTrace();
}
The first two are (obviously) subclasses of IOException.
How can I add such subclasses into catch in a better (quicker, easier) way than copy/pasting then?
I am confident that IDEA has such automatic feature, but I am not sure which one it is or how to use it.

Alt+Enter on try, Detail exceptions: