Hi,
I want to override the back key of the Android device to display a
dialog,
which consists of two buttons say "Back" and "Exit". when you press
the Back button
in dialog it should dispatch back key to the top activity which is
currently running, i can able to get
system context by adding following code snippet to
<android_source_directory>frameworks/
base/services/java/com/android/server/WindowManagerService.java.
ActivityThread at = ActivityThread.currentActivityThread();
if (at == null) {
Looper.prepare();
at = ActivityThread.systemMain();
}
if(at != null){
sysContext = at.getSystemContext();
Log.d(TAG, "SystemContext = " + sysContext);
}
to display the dialog i added following code
Dialog dialog = new Dialog(myContext);
dialog.setContentView(com.android.internal.R.layout.<my-layout-name>);
dialog.setTitle("Custom Dialog");
dialog.show();
Using sysContext, I can able to display toast, and I can able to
launch the activity, but
when i try to display a dialog using the same sysContext i got the
error saying,
unable to add window "window token is null" it would be great if you
give any input
why it is not able to display dialog using sysConttext?
i added the following code, snippet to get top activity pid
am = (ActivityManager)
myContext.getSystemService(Activity.ACTIVITY_SERVICE);
currentPackageName =
am.getRunningTasks(1).get(0).topActivity.getPackageName();
List<ActivityManager.RunningAppProcessInfo> processes;
processes = am.getRunningAppProcesses();
for(ActivityManager.RunningAppProcessInfo info: processes) {
Log.i("Process:", info.processName);
if(currentPackageName.equalsIgnoreCase(info.processName)){
Log.i(TAG, "Found !");
mpid = info.pid; //pid of top Activity
muid = 0; // will be always 0
}
}
private Handler msgHandler = new Handler(){
//this method will handle the calls from other threads.
public void handleMessage(Message msg) {
int result = -1;
switch (msg.what) {
case TPMUHelper.DISPATCH_BACK_KEY:
Log.d(TAG, "Dispatching Back_Key");
code = KeyEvent.KEYCODE_BACK;
KeyEvent backEvent = new KeyEvent(downTime,
eventTime,
action, code, repeatCount, metaState,
deviceId, scancode, KeyEvent.FLAG_FROM_SYSTEM);
Log.i(TAG, "PID = " + mpid + ", UID = " +muid);
result = dispatchKey(backEvent, mpid, muid);
Log.d(TAG, "Dispatch Key Returns = " + result);
break;
}
}
};
When i send "DISPATCH_BACK_KEY" message from my-activity "Back" button
press event, it comes here
and dispatch back key, dispatchkey(KeyEvent event, int pid, int uid)
returns '1', i am success with
this, however currently running activity is not getting closed. simply
what i need is, i want to
send back key to whichever the activity is currently running, (system
application or 3rd party
application). input regarding the same is appreciated.
Thanks & Regards
Praveen
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