[安卓] 10、悬浮窗与获取其他任务信息

这里介绍的是一个浮动窗口以及用该浮动窗口显示当前在顶层的应用信息~一个需要写2个layout和2个java

 1 public class MainActivity extends Activity {
 2     @Override
 3     public void onCreate(Bundle savedInstanceState) {
 4         super.onCreate(savedInstanceState);
 5         setContentView(R.layout.main);
 6         // FloatingWindowActivity的布局视图按钮
 7         Button start = (Button) findViewById(R.id.start_id);
 8         Button remove = (Button) findViewById(R.id.remove_id);
 9         start.setOnClickListener(new OnClickListener() {
10             @Override
11             public void onClick(View v) {
12                 // TODO Auto-generated method stub
13                 Intent intent = new Intent(MainActivity.this, FxService.class);
14                 startService(intent);
15                 finish();
16             }
17         });
18
19         remove.setOnClickListener(new OnClickListener() {
20             @Override
21             public void onClick(View v) {
22                 Intent intent = new Intent(MainActivity.this, FxService.class);
23                 stopService(intent);
24             }
25         });
26
27     }
28 }

 1 private void createFloatView() {
 2     wmParams = new WindowManager.LayoutParams();
 3     // 获取WindowManagerImpl.CompatModeWrapper
 4     mWindowManager = (WindowManager) getApplication().getSystemService(
 5             getApplication().WINDOW_SERVICE);
 6     // 设置window type
 7     wmParams.type = LayoutParams.TYPE_PHONE;
 8     // 设置图片格式，效果为背景透明
 9     wmParams.format = PixelFormat.RGBA_8888;
10     // 设置浮动窗口不可聚焦（实现操作除浮动窗口外的其他可见窗口的操作）
11     wmParams.flags =
12     // LayoutParams.FLAG_NOT_TOUCH_MODAL |
13     LayoutParams.FLAG_NOT_FOCUSABLE
14     // LayoutParams.FLAG_NOT_TOUCHABLE
15     ;
16
17     // 调整悬浮窗显示的停靠位置为左侧置顶
18     wmParams.gravity = Gravity.LEFT | Gravity.TOP;
19
20     // 以屏幕左上角为原点，设置x、y初始值
21     wmParams.x = 0;
22     wmParams.y = 0;
23
24     /*
25      * // 设置悬浮窗口长宽数据 wmParams.width = 200; wmParams.height = 80;
26      */
27
28     // 设置悬浮窗口长宽数据
29     wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
30     wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
31
32     LayoutInflater inflater = LayoutInflater.from(getApplication());
33     // 获取浮动窗口视图所在布局
34     mFloatLayout = (LinearLayout) inflater.inflate(R.layout.float_layout,
35             null);
36     // 添加mFloatLayout
37     mWindowManager.addView(mFloatLayout, wmParams);
38
39     Log.i(TAG, "mFloatLayout-->left" + mFloatLayout.getLeft());
40     Log.i(TAG, "mFloatLayout-->right" + mFloatLayout.getRight());
41     Log.i(TAG, "mFloatLayout-->top" + mFloatLayout.getTop());
42     Log.i(TAG, "mFloatLayout-->bottom" + mFloatLayout.getBottom());
43
44     // 浮动窗口按钮
45     mFloatView = (Button) mFloatLayout.findViewById(R.id.float_id);
46     mFloatLayout.measure(View.MeasureSpec.makeMeasureSpec(0,
47             View.MeasureSpec.UNSPECIFIED), View.MeasureSpec
48             .makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
49     Log.i(TAG, "Width/2--->" + mFloatView.getMeasuredWidth() / 2);
50     Log.i(TAG, "Height/2--->" + mFloatView.getMeasuredHeight() / 2);
51     // 设置监听浮动窗口的触摸移动
52     mFloatView.setOnTouchListener(new OnTouchListener() {
53
54         @Override
55         public boolean onTouch(View v, MotionEvent event) {
56             // TODO Auto-generated method stub
57             // getRawX是触摸位置相对于屏幕的坐标，getX是相对于按钮的坐标
58             wmParams.x = (int) event.getRawX()
59                     - mFloatView.getMeasuredWidth() / 2;
60             // Log.i(TAG, "Width/2--->" + mFloatView.getMeasuredWidth()/2);
61             Log.i(TAG, "RawX" + event.getRawX());
62             Log.i(TAG, "X" + event.getX());
63             // 25为状态栏的高度
64             wmParams.y = (int) event.getRawY()
65                     - mFloatView.getMeasuredHeight() / 2 - 25;
66             // Log.i(TAG, "Width/2--->" + mFloatView.getMeasuredHeight()/2);
67             Log.i(TAG, "RawY" + event.getRawY());
68             Log.i(TAG, "Y" + event.getY());
69             // 刷新
70             mWindowManager.updateViewLayout(mFloatLayout, wmParams);
71             return false;
72         }
73     });
74
75     mFloatView.setOnClickListener(new OnClickListener() {
76         @Override
77         public void onClick(View v) {//显示当前是哪个应用在顶层
78             // TODO Auto-generated method stub
79             pm = getPackageManager();
80             am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
81             String packageName = am.getRunningTasks(1).get(0).topActivity
82                     .getPackageName();
83             try {
84                 String progressName = pm.getApplicationLabel(
85                         pm.getApplicationInfo(packageName,
86                                 PackageManager.GET_META_DATA)).toString();
87                 mFloatView = (Button) mFloatLayout
88                         .findViewById(R.id.float_id);
89                 mFloatView.setText(progressName);
90                 Toast.makeText(FxService.this, progressName,
91                         Toast.LENGTH_SHORT).show();
92             } catch (NameNotFoundException e) {
93                 // TODO Auto-generated catch block
94                 e.printStackTrace();
95             }
96         }
97     });
98 }

注意：如果想获得系统的TopActivity，还必须获得权限：

<uses-permission android:name="android.permission.GET_TASKS" />

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

本文链接：http://www.cnblogs.com/zjutlitao/p/4231525.html

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github:   https://github.com/beautifulzzzz/Android/tree/master/FloatingWindow