由于最近小蔡的手機音量鍵壞了，調節音量有點麻煩，突發奇想，想自己實現一個快捷鍵來調節音量。在忘上參考了一些代碼，總結出一般本章，分享給大家。

首先 按鈕要想實現懸浮在任何界面，那么必須是要寫在服務里面的，使用定時器，2.5s不觸摸后，背景變淡

下載地址

清單文件中加權限

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

public class FloatViewService extends Service {

    private static final String TAG = "FloatViewService";
    // 定義浮動窗口布局
    private LinearLayout mFloatLayout;
    private WindowManager.LayoutParams wmParams;
    // 創建浮動窗口設置布局參數的對象
    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;//自己寫的工具類用來獲取屏幕寬高。
        screenWidth = ScreenParam.getInstance().width;
        createFloatView();
        myCountDownTimer = new MyCountDownTimer(2500, 1000); //設置計時2.5s
        myCountDownTimer.start();
    }

    @SuppressWarnings("static-access")
    @SuppressLint("InflateParams")
    private void createFloatView() {
        wmParams = new WindowManager.LayoutParams();
        // 通過getApplication獲取的是WindowManagerImpl.CompatModeWrapper
        mWindowManager = (WindowManager) getApplication().getSystemService(
                getApplication().WINDOW_SERVICE);
        // 設置window type
        wmParams.type = LayoutParams.TYPE_PHONE;
        // 設置圖片格式，效果為背景透明
        wmParams.format = PixelFormat.RGBA_8888;
        // 設置浮動窗口不可聚焦（實現操作除浮動窗口外的其他可見窗口的操作）
        wmParams.flags = LayoutParams.FLAG_NOT_FOCUSABLE;
        // 調整懸浮窗顯示的停靠位置為右側底部
        wmParams.gravity = Gravity.RIGHT | Gravity.BOTTOM;
        // 以屏幕左上角為原點，設置x、y初始值，相對于gravity
        wmParams.x = 0;
        wmParams.y = 150;
        // 設置懸浮窗口長寬數據
        wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
        wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT;

        LayoutInflater inflater = LayoutInflater.from(getApplication());
        // 獲取浮動窗口視圖所在布局
        mFloatLayout = (LinearLayout) inflater.inflate(
                R.layout.alert_window_menu, null);
        // 添加mFloatLayout
        mWindowManager.addView(mFloatLayout, wmParams);
        // 浮動窗口按鈕
        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));

        // 設置監聽浮動窗口的觸摸移動
        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();取消計時
                    
                    rawX = event.getRawX();
                    rawY = event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    // getRawX是觸摸位置相對于屏幕的坐標，getX是相對于按鈕的坐標
                    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();重新開始計時
                    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) {
            // 移除懸浮窗口
            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里啟動服務就好了

   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);  
         //啟動FloatViewService  
         startService(intent);  
        super.onStart();
    }

如果不想顯示Activity界面的話，可以在配置這個屬性就ok了

android:theme="@android:style/Theme.NoDisplay"

就是這么簡單！

總結

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