覆盖over在其他应用APP上的图View,使用TYPE_SYSTEM_OVERLAY特性

原文：http://stackoverflow.com/questions/4481226/creating-a-system-overlay-always-on-top-button-in-android

怕哪天丢了。。先收起

I'm trying to create an always-op-top button/clickable-image which stays on top of all the windows all the time. The proof of concept is here - Smart Taskbar (on AppBrain) and here V1.4.0 Sidebar style SWKey - Button savior (on xda-developers) I was following sample code that used to live at this URL but the link is now dead. services/java/com/android/server/LoadAverageService.java (on http://android.git.kernel.org) I have been successful and have a running service now. The service displays some text on top left corner of screen all the time while user can freely interact with rest of apps in normal manner. What I'm doing is subclass ViewGroup and add it to root window manager with flag TYPE_SYSTEM_OVERLAY. Now I want to add a button/clickable-image in place of this text which can receive touch events on itself. I tried overriding "onTouchEvent" for the whole ViewGroup but it does not receive any event. How can I receive events only on certain parts of my always-on-top view group? Kindly suggest. public class HUD extends Service { HUDView mView; @Override public IBinder onBind(Intent intent) { return null; } @Override public void onCreate() { super.onCreate(); Toast.makeText(getBaseContext(),"onCreate", Toast.LENGTH_LONG).show(); mView = new HUDView(this); WindowManager.LayoutParams params = new WindowManager.LayoutParams( WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY, 0, // WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE // | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE, PixelFormat.TRANSLUCENT); params.gravity = Gravity.RIGHT | Gravity.TOP; params.setTitle("Load Average"); WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE); wm.addView(mView, params); } @Override public void onDestroy() { super.onDestroy(); Toast.makeText(getBaseContext(),"onDestroy", Toast.LENGTH_LONG).show(); if(mView != null) { ((WindowManager) getSystemService(WINDOW_SERVICE)).removeView(mView); mView = null; } } } class HUDView extends ViewGroup { private Paint mLoadPaint; public HUDView(Context context) { super(context); Toast.makeText(getContext(),"HUDView", Toast.LENGTH_LONG).show(); mLoadPaint = new Paint(); mLoadPaint.setAntiAlias(true); mLoadPaint.setTextSize(10); mLoadPaint.setARGB(255, 255, 0, 0); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); canvas.drawText("Hello World", 5, 15, mLoadPaint); } @Override protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) { } @Override public boolean onTouchEvent(MotionEvent event) { //return super.onTouchEvent(event); Toast.makeText(getContext(),"onTouchEvent", Toast.LENGTH_LONG).show(); return true; } } android overlay android-ui share | improve this question edited Oct 17 '12 at 18:43 Richard Le Mesurier 3,684 14 59 asked Dec 19 '10 at 1:57 coreSOLO 396 1 6 15

@coreSOLO, I hope you get you're answer, my oddly similar questions didnt get any response. :) +1 – st0le Dec 19 '10 at 6:44   @st0le I promise I'll spend my night and day until I find the solution and share it with you :) – coreSOLO Dec 19 '10 at 8:02   @coreSOLO, hehe ;) – st0le Dec 19 '10 at 8:15   @st0le Ok maybe you and me can dig it out together, give me a link of your question and let me know how much progress you were able to make... – coreSOLO Dec 19 '10 at 9:01   its not much :-\ stackoverflow.com/questions/3732935/… – st0le Dec 19 '10 at 9:40 show 1 more comment

6 Answers

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up vote 40 down vote accepted

This might be a stupid solution. But it works. If you can improve it, please let me know. OnCreate of your Service: I have used WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH flag. This is the only change in service. @Override public void onCreate() { super.onCreate(); Toast.makeText(getBaseContext(),"onCreate", Toast.LENGTH_LONG).show(); mView = new HUDView(this); WindowManager.LayoutParams params = new WindowManager.LayoutParams( WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY, WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH, PixelFormat.TRANSLUCENT); params.gravity = Gravity.RIGHT | Gravity.TOP; params.setTitle("Load Average"); WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE); wm.addView(mView, params); } Now, you will start getting each and every click event. So, you need to rectify in your event handler. In your ViewGroup touch event @Override public boolean onTouchEvent(MotionEvent event) { // ATTENTION: GET THE X,Y OF EVENT FROM THE PARAMETER // THEN CHECK IF THAT IS INSIDE YOUR DESIRED AREA Toast.makeText(getContext(),"onTouchEvent", Toast.LENGTH_LONG).show(); return true; } share | improve this answer edited Jul 12 '11 at 23:33 Jacob 27.4k 4 38 102 answered Dec 19 '10 at 12:12 Sarwar Erfan 8,671 2 17 32

AWESOME!!! Thanks a bunch. I'll try this out and let you know, but I know for sure that it works :) Yes I have a couple of possible improvements in mind for my original service which might optimize event handling. I'll let you know soon! Thanks again! – coreSOLO Dec 19 '10 at 14:02   can you give some more codes,when i run the code,but get more errors – pengwang Dec 27 '10 at 10:10 1   @pengwang: what errors are you getting? This code is not independent, you need to place them in your project with appropriate file names under appropriate project. – Sarwar Erfan Dec 28 '10 at 3:34 1   @pengwang: Find simplest implementation here:docs.google.com/… – Sarwar Erfan Dec 28 '10 at 12:07 2   the whole code is correct,i find my mistake,i forget the link <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> Sarwar Erfan i think you edit your answer,it can become more wonderful – pengwang Dec 28 '10 at 13:23 show 7 more comments

up vote 14 down vote

Following @Sam Lu's answer, Indeed Android 4.x blocks certain types from listening to outside touch events, but some types, such as TYPE_SYSTEM_ALERT, still do the job. Example WindowManager.LayoutParams params = new WindowManager.LayoutParams( WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.TYPE_SYSTEM_ALERT, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL|WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH, PixelFormat.TRANSLUCENT); WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE); LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE); View myView = inflater.inflate(R.layout.my_view, null); myView.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { Log.d(TAG, "touch me"); return false; } }); // Add layout to window manager wm.addView(myView, params); Permissions <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/> share | improve this answer edited Feb 8 at 17:42 ArtemStorozhuk 5,581 1 8 29 answered May 20 '12 at 14:53 amirlazarovich 276 3 5

Great! Thanks so much! – pypmannetjies Aug 30 '12 at 12:00 1   Its making my screen hanged .. Any idea – Arju Apr 5 at 16:38   Great post. Hopefully this isn't disabled in future releases either. – Cookster Apr 23 at 16:47   Animations won't work on it... :( And it's unable to catch clicks on any view in it on 4.2.X. Any suggestions? – Kamran Jun 1 at 5:26

up vote 7 down vote

Starting from Android 4.x, Android team Android team fixed a potential security problem by adding a new function adjustWindowParamsLw() in which it will add FLAG_NOT_FOCUSABLE, FLAG_NOT_TOUCHABLE and remove FLAG_WATCH_OUTSIDE_TOUCH flags for TYPE_SYSTEM_OVERLAY window. That's TYPE_SYSTEM_OVERLAY window won't receive any touch event on ICS platform and, of course, to use TYPE_SYSTEM_OVERLAY is not a workable solution for ICS and future devices. share | improve this answer answered Feb 27 '12 at 8:47 Sam Lu 449 3 9

2   so what are the alternatives? – radhoo Apr 4 '12 at 8:56 1   See this question about ICS : stackoverflow.com/questions/9656185/type-system-overlay-in-ics – clemp6r Jun 28 '12 at 7:46

up vote 3 down vote

Well try my code, atleast it gives you a string as overlay, you can very well replace it with a button or an image. You wont believe this is my first ever android app LOL. Anyways if you are more experienced with android apps than me, please try changing parameters 2 and 3 in "new WindowManager.LayoutParams" try some different event approach share | improve this answer answered Dec 19 '10 at 10:00 coreSOLO 396 1 6 15

I've got over 8 months of Android behind me, but here's a thread that helped me earlier...stackoverflow.com/questions/3734099/… – st0le Dec 19 '10 at 11:05   i eventually didnt find time to pursue this, hence i'm still scarce on its details... – st0le Dec 19 '10 at 11:06

up vote 1 down vote

Try this. Works fine in ICS. If You want to stop service simply click the notification generated in statusbar. public class HUD extends Service { protected boolean foreground = false; protected boolean cancelNotification = false; private Notification notification; private View myView; protected int id = 0; private WindowManager wm; private WindowManager.LayoutParams params; @Override public IBinder onBind(Intent intent) { return null; } @Override public void onCreate() { super.onCreate(); // System.exit(0); Toast.makeText(getBaseContext(),"onCreate", Toast.LENGTH_SHORT).show(); params = new WindowManager.LayoutParams(WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_PHONE, WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, PixelFormat.TRANSLUCENT); params.gravity=Gravity.TOP|Gravity.LEFT; wm = (WindowManager) getSystemService(WINDOW_SERVICE); inflateview(); foregroundNotification(1); //moveToForeground(1,n,true); } @Override public void onDestroy() { super.onDestroy(); ((NotificationManager) getSystemService(NOTIFICATION_SERVICE)).cancel(0); Toast.makeText(getBaseContext(),"onDestroy", Toast.LENGTH_SHORT).show(); if(myView != null) { ((WindowManager) getSystemService(WINDOW_SERVICE)).removeView(myView); myView = null; } } protected Notification foregroundNotification(int notificationId) { notification = new Notification(R.drawable.ic_launcher, "my Notification", System.currentTimeMillis()); notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT | Notification.FLAG_ONLY_ALERT_ONCE; notification.setLatestEventInfo(this, "my Notification", "my Notification", notificationIntent()); ((NotificationManager) getSystemService(NOTIFICATION_SERVICE)).notify(id, notification); return notification; } private PendingIntent notificationIntent() { Intent intent = new Intent(this, stopservice.class); PendingIntent pending = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT); return pending; } public void inflateview() { LayoutInflater inflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE); myView = inflater.inflate(R.layout.activity_button, null); myView.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { Toast.makeText(getBaseContext(),"onToasttt", Toast.LENGTH_SHORT).show(); return false; } }); // Add layout to window manager wm.addView(myView, params); } } share | improve this answer edited Jun 7 at 13:41 kirelagin 4,714 9 28 answered Apr 5 at 18:52 Arju 577 1 14

up vote 0 down vote

WORKING ALWAYS ON TOP IMAGE BUTTON first of all sorry for my english i edit your codes and make working image button that listens his touch event do not give touch control to his background elements. also it gives touch listeners to out of other elements button alingments are bottom and left you can chage alingments but you need to chages cordinats in touch event in the if element import android.annotation.SuppressLint; import android.app.Service; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.PixelFormat; import android.os.IBinder; import android.util.Log; import android.view.Gravity; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.Toast; public class HepUstte extends Service { HUDView mView; @Override public void onCreate() { super.onCreate(); Toast.makeText(getBaseContext(),"onCreate", Toast.LENGTH_LONG).show(); final Bitmap kangoo = BitmapFactory.decodeResource(getResources(), R.drawable.logo_l); WindowManager.LayoutParams params = new WindowManager.LayoutParams( kangoo.getWidth(), kangoo.getHeight(), WindowManager.LayoutParams.TYPE_SYSTEM_ALERT, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL |WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH, PixelFormat.TRANSLUCENT); params.gravity = Gravity.LEFT | Gravity.BOTTOM; params.setTitle("Load Average"); WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE); mView = new HUDView(this,kangoo); mView.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View arg0, MotionEvent arg1) { // TODO Auto-generated method stub //Log.e("kordinatlar", arg1.getX()+":"+arg1.getY()+":"+display.getHeight()+":"+kangoo.getHeight()); if(arg1.getX()<kangoo.getWidth() & arg1.getY()>0) { Log.d("tıklandı", "touch me"); } return false; } }); wm.addView(mView, params); } @Override public IBinder onBind(Intent arg0) { // TODO Auto-generated method stub return null; } } @SuppressLint("DrawAllocation") class HUDView extends ViewGroup { Bitmap kangoo; public HUDView(Context context,Bitmap kangoo) { super(context); this.kangoo=kangoo; } protected void onDraw(Canvas canvas) { //super.onDraw(canvas); // delete below line if you want transparent back color, but to understand the sizes use back color canvas.drawColor(Color.BLACK); canvas.drawBitmap(kangoo,0 , 0, null); //canvas.drawText("Hello World", 5, 15, mLoadPaint); } protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) { } public boolean onTouchEvent(MotionEvent event) { //return super.onTouchEvent(event); // Toast.makeText(getContext(),"onTouchEvent", Toast.LENGTH_LONG).show(); return true; }