由于最近小蔡的手机音量键坏了，调节音量有点麻烦，突发奇想，想自己实现一个快捷键来调节音量。在忘上参考了一些代码，总结出一般本章，分享给大家。
首先 按钮要想实现悬浮在任何界面，那么必须是要写在服务里面的，使用定时器，2.5s不触摸后，背景变淡
清单文件中加权限
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
public class FloatViewService extends Service { private static final String TAG = "FloatViewService"; // 定义浮动窗口布局 private LinearLayout mFloatLayout; private WindowManager.LayoutParams wmParams; // 创建浮动窗口设置布局参数的对象 private WindowManager mWindowManager; private ImageButton mFloatView; private int screenHeight; private int screenWidth; private MyCountDownTimer myCountDownTimer; @Override public void onCreate() { super.onCreate(); Log.i(TAG, "onCreate"); screenHeight = ScreenParam.getInstance().height;//自己写的工具类用来获取屏幕宽高。 screenWidth = ScreenParam.getInstance().width; createFloatView(); myCountDownTimer = new MyCountDownTimer(2500, 1000); //设置计时2.5s myCountDownTimer.start(); } @SuppressWarnings("static-access") @SuppressLint("InflateParams") private void createFloatView() { wmParams = new WindowManager.LayoutParams(); // 通过getApplication获取的是WindowManagerImpl.CompatModeWrapper mWindowManager = (WindowManager) getApplication().getSystemService( getApplication().WINDOW_SERVICE); // 设置window type wmParams.type = LayoutParams.TYPE_PHONE; // 设置图片格式，效果为背景透明 wmParams.format = PixelFormat.RGBA_8888; // 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） wmParams.flags = LayoutParams.FLAG_NOT_FOCUSABLE; // 调整悬浮窗显示的停靠位置为右侧底部 wmParams.gravity = Gravity.RIGHT | Gravity.BOTTOM; // 以屏幕左上角为原点，设置x、y初始值，相对于gravity wmParams.x = 0; wmParams.y = 150; // 设置悬浮窗口长宽数据 wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT; wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT; LayoutInflater inflater = LayoutInflater.from(getApplication()); // 获取浮动窗口视图所在布局 mFloatLayout = (LinearLayout) inflater.inflate( R.layout.alert_window_menu, null); // 添加mFloatLayout mWindowManager.addView(mFloatLayout, wmParams); // 浮动窗口按钮 mFloatView = (ImageButton) mFloatLayout .findViewById(R.id.alert_window_imagebtn); mFloatLayout.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec .makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)); // 设置监听浮动窗口的触摸移动 mFloatView.setOnTouchListener(new OnTouchListener() { boolean isClick; private int leftDistance; private float rawX; private float rawY; @SuppressLint("ClickableViewAccessibility") @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mFloatLayout.setAlpha(1.0f); myCountDownTimer.cancel();取消计时 rawX = event.getRawX(); rawY = event.getRawY(); break; case MotionEvent.ACTION_MOVE: // getRawX是触摸位置相对于屏幕的坐标，getX是相对于按钮的坐标 int distanceX = (int) (event.getRawX()-rawX); int distanceY = (int) (event.getRawY()-rawY); leftDistance = (int) event.getRawX() + mFloatView.getMeasuredWidth() / 2; wmParams.x = wmParams.x-distanceX; wmParams.y = wmParams.y-distanceY; // 刷新 mWindowManager.updateViewLayout(mFloatLayout, wmParams); rawX = event.getRawX(); rawY = event.getRawY(); break; case MotionEvent.ACTION_UP: myCountDownTimer.start();重新开始计时 if(wmParams.x>leftDistance){ wmParams.x = screenWidth-mFloatView.getMeasuredWidth() / 2; }else{ wmParams.x = 0; } mWindowManager.updateViewLayout(mFloatLayout, wmParams); break; } return false; } }); mFloatView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { AudioManager audioManager = (AudioManager) getSystemService(Service.AUDIO_SERVICE); audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, audioManager.getStreamVolume(AudioManager.STREAM_MUSIC), AudioManager.FLAG_SHOW_UI); // Toast.makeText(FloatViewService.this, "hello!", // Toast.LENGTH_SHORT).show(); } }); } @Override public void onDestroy() { super.onDestroy(); if (mFloatLayout != null) { // 移除悬浮窗口 mWindowManager.removeView(mFloatLayout); } } @Override public IBinder onBind(Intent intent) { return null; } public class MyCountDownTimer extends CountDownTimer { public MyCountDownTimer(long millisInFuture, long countDownInterval) { super(millisInFuture, countDownInterval); } @Override public void onTick(long millisUntilFinished) { } @Override public void onFinish() { mFloatLayout.setAlpha(0.4f); } } }
然后再Activity里启动服务就好了
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ScreenParam.getInstance().init(this); } @Override protected void onStart() { // TODO Auto-generated method stub Intent intent = new Intent(MainActivity.this, FloatViewService.class); //启动FloatViewService startService(intent); super.onStart(); }
如果不想显示Activity界面的话，可以在配置这个属性就ok了
android:theme="@android:style/Theme.NoDisplay"
就是这么简单！