Unity3D研究院之悬浮框显示其他游戏电流功耗（一百二十六）

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (!Settings.canDrawOverlays(this)) {
            Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);
            startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName())), 0);
        }else{
            startService(new Intent(MainActivity.this, FloatingButtonService.class));
        }
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (!Settings.canDrawOverlays(this)) {
            Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();
            startService(new Intent(MainActivity.this, FloatingButtonService.class));
        }

    }

}

public class FloatingButtonService extends Service {

    private WindowManager windowManager;
    private WindowManager.LayoutParams layoutParams;
    private Button button;
    BatteryManager bm;

    String value="";
    private Handler handler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            handler.removeMessages(0);
            float a =  ToMA(bm.getIntProperty(BatteryManager.BATTERY_PROPERTY_CURRENT_NOW));
            value="电流" + a + "毫安";
            button.setText("电流" + a + "毫安");
            handler.sendEmptyMessageDelayed(0, 1000);
        };
    };

    static float ToMA(float maOrua)
    {
        return maOrua < 10000 ? maOrua : maOrua / 1000f;
    }


    @Override
    public void onCreate() {
        super.onCreate();
        windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        layoutParams = new WindowManager.LayoutParams();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
        } else {
            layoutParams.type = WindowManager.LayoutParams.TYPE_PHONE;
        }
        layoutParams.format = PixelFormat.RGBA_8888;
        layoutParams.gravity = Gravity.CENTER;
        layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        layoutParams.width = 500;
        layoutParams.height = 100;
        layoutParams.x = 300;
        layoutParams.y = 300;
        bm = (BatteryManager)getSystemService(BATTERY_SERVICE);
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        showFloatingWindow();
        return super.onStartCommand(intent, flags, startId);
    }

    private void showFloatingWindow() {
        if (Settings.canDrawOverlays(this)) {
            button = new Button(getApplicationContext());
            button.setBackgroundColor(Color.BLUE);
            button.setAlpha(0.8f);
            button.setPadding(0,0,0,0);
            windowManager.addView(button, layoutParams);
            handler.sendEmptyMessage(0);
            button.setOnTouchListener(new FloatingOnTouchListener());

        }
    }

    private class FloatingOnTouchListener implements View.OnTouchListener {
        private int x;
        private int y;

        @Override
        public boolean onTouch(View view, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    x = (int) event.getRawX();
                    y = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int nowX = (int) event.getRawX();
                    int nowY = (int) event.getRawY();
                    int movedX = nowX - x;
                    int movedY = nowY - y;
                    x = nowX;
                    y = nowY;
                    layoutParams.x = layoutParams.x + movedX;
                    layoutParams.y = layoutParams.y + movedY;
                    windowManager.updateViewLayout(view, layoutParams);
                    break;
                default:
                    break;
            }
            return false;
        }
    }
}