自定义全局快捷键

在Activity类onKeyDown方法中进入拦截事件
    public boolean onKeyDown(int keyCode, KeyEvent event)  {
    Log.i("key down", "key code:"+event.getKeyCode());
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            if (getApplicationInfo().targetSdkVersion
                    >= Build.VERSION_CODES.ECLAIR) {
                event.startTracking();
            } else {
                onBackPressed();
            }
            return true;
        }else if(keyCode == 7){ （快捷键code=7，定位到桌面时钟）
            ComponentName cmp = new ComponentName("com.android.deskclock", "com.android.deskclock.DeskClock");
            Intent intent = new Intent();
            intent.setComponent(cmp);
            startActivity(intent);
            return true;
        }else if(keyCode == 42){
            ComponentName cmp = new ComponentName("com.autonavi.routedemo", "com.autonavi.routedemo.Main");
            Intent intent = new Intent();
            intent.setComponent(cmp);
            startActivity(intent);
            return true;
        }else if(keyCode == 31){（快捷键code=31，定位到日历）
            ComponentName cmp = new ComponentName("com.android.calendar", "com.android.calendar.LaunchActivity");
            Intent intent = new Intent();
            intent.setComponent(cmp);
            startActivity(intent);
            return true;
        }else if(keyCode == KeyEvent.KEYCODE_X){（快捷键X，静音/取消静音）
            Log.i("activity onkeydown", "you have clicked the x key");
                      
            AudioManager mAudioManager = (AudioManager)getSystemService(Service.AUDIO_SERVICE);
            Log.i("activity onkeydown RingerMode before:", ""+mAudioManager.getRingerMode());
    boolean state = ((mAudioManager.getRingerMode()&2)==0)?false:true;
            Log.i("activity onkeydown state", ""+state);
    mAudioManager.setStreamMute(AudioManager.STREAM_MUSIC,state);
            mAudioManager.setRingerMode(state==false?2:1);
            Log.i("activity onkeydown RingerMode after:", ""+mAudioManager.getRingerMode());
            return true;
        }else if(keyCode == KeyEvent.KEYCODE_EQUALS){（快速启动播放器）
            Log.i("activity onkeydown", "you have clicked the KEYCODE_EQUALS key:"+KeyEvent.KEYCODE_EQUALS);
                      
            AudioManager mAudioManager = (AudioManager)getSystemService(Service.AUDIO_SERVICE);
            mAudioManager.setStreamMute(AudioManager.STREAM_MUSIC,false);
            mAudioManager.setRingerMode(2);
    mAudioManager.adjustVolume(AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
            return true;
        }else if(keyCode == KeyEvent.KEYCODE_MINUS){
            Log.i("activity onkeydown", "you have clicked the KEYCODE_MINUS key:"+KeyEvent.KEYCODE_MINUS);       
            AudioManager mAudioManager = (AudioManager)getSystemService(Service.AUDIO_SERVICE);
            mAudioManager.adjustVolume(AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
            return true;
        }