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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.example.android.apis.view;
     17 
     18 import com.example.android.apis.R;
     19 
     20 import android.app.Activity;
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.graphics.Color;
     24 import android.graphics.PixelFormat;
     25 import android.net.Uri;
     26 import android.os.Build;
     27 import android.os.Bundle;
     28 import android.provider.Settings;
     29 import android.view.Gravity;
     30 import android.view.View;
     31 import android.view.View.OnClickListener;
     32 import android.view.WindowManager;
     33 import android.view.WindowManager.LayoutParams;
     34 import android.widget.Button;
     35 import android.widget.TextView;
     36 
     37 /**
     38  * Demonstrates the display of overlay windows, i.e. windows that are drawn on top of other apps.
     39  */
     40 public class OverlayWindowActivity extends Activity {
     41 
     42     private static int MANAGE_OVERLAY_PERMISSION_REQUEST_CODE = 1;
     43     private View mOverlayView;
     44 
     45     @Override
     46     protected void onCreate(Bundle savedInstanceState) {
     47         super.onCreate(savedInstanceState);
     48 
     49         setContentView(R.layout.overlay_window);
     50 
     51         Button button = (Button)findViewById(R.id.show_overlay);
     52         button.setOnClickListener(mShowOverlayListener);
     53         button = (Button)findViewById(R.id.hide_overlay);
     54         button.setOnClickListener(mHideOverlayListener);
     55     }
     56 
     57     private OnClickListener mShowOverlayListener = new OnClickListener() {
     58         @Override
     59         public void onClick(View view) {
     60             if (Settings.canDrawOverlays(OverlayWindowActivity.this)) {
     61                 drawOverlay();
     62             } else {
     63                 // Need to ask the user's permission first. We'll redirect them to Settings.
     64                 Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
     65                         Uri.parse("package:" + getPackageName()));
     66                 startActivityForResult(intent, MANAGE_OVERLAY_PERMISSION_REQUEST_CODE);
     67             }
     68         }
     69     };
     70 
     71     private OnClickListener mHideOverlayListener = new OnClickListener() {
     72         @Override
     73         public void onClick(View view) {
     74             if (mOverlayView != null) {
     75                 WindowManager wm = getWindowManager();
     76                 wm.removeView(mOverlayView);
     77                 mOverlayView = null;
     78             }
     79         }
     80     };
     81 
     82     /**
     83      * This is called after the user chooses whether they grant permission to the app to display
     84      * overlays or not.
     85      */
     86     @Override
     87     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     88         if (requestCode == MANAGE_OVERLAY_PERMISSION_REQUEST_CODE) {
     89             // Check if the user granted permission to draw overlays.
     90             if (Settings.canDrawOverlays(this)) {
     91                 drawOverlay();
     92             }
     93         }
     94     }
     95 
     96     private void drawOverlay() {
     97         if (mOverlayView != null) {
     98             // Already shown.
     99             return;
    100         }
    101 
    102         TextView textView = new TextView(this);
    103         textView.setText("I'm an overlay");
    104         textView.setBackgroundColor(Color.WHITE);
    105         textView.setTextColor(Color.BLACK);
    106         textView.setPadding(10, 10, 10, 10);
    107 
    108         WindowManager wm = getWindowManager();
    109         LayoutParams params = new LayoutParams();
    110 
    111         params.type = (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
    112                 ? LayoutParams.TYPE_APPLICATION_OVERLAY
    113                 : LayoutParams.TYPE_PHONE;
    114         params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
    115                 | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
    116                 | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;
    117         params.format = PixelFormat.TRANSPARENT;
    118 
    119         params.width = LayoutParams.WRAP_CONTENT;
    120         params.height = LayoutParams.WRAP_CONTENT;
    121         // Snap to the upper right corner of the screen.
    122         params.gravity = Gravity.TOP | Gravity.RIGHT;
    123         // Set position relative to upper right corner.
    124         params.x = 10;
    125         params.y = 10;
    126 
    127         wm.addView(textView, params);
    128         mOverlayView = textView;
    129     }
    130 }
    131