@Overridepublic void onAttachedToWindow() {  this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);  super.onAttachedToWindow();}

if (keyCode == KeyEvent.KEYCODE_HOME) {  //在這里發送一個廣播出去}

private boolean isTesting = true;class CatchLogThread extends Thread {  @Override  public void run() {    Process mLogcatProc = null;    BufferedReader reader = null;    String line;    while (isTesting) {      try {        // 獲取logcat日志信息        mLogcatProc = Runtime.getRuntime().exec(new String[] { "logcat", "ActivityManager:I *:S" });        reader = new BufferedReader(new InputStreamReader(mLogcatProc.getInputStream()));        while ((line = reader.readLine()) != null) {          if (line.indexOf("android.intent.category.HOME") > 0) {            isTesting = false;            handler.sendMessage(handler.obtainMessage());            Runtime.getRuntime().exec("logcat -c");//刪除日志            break;          }        }      } catch (Exception e) {        e.printStackTrace();      }    }  }};Handler handler = new Handler() {  public void handleMessage(android.os.Message msg) {    Log.i(TAG,"Home key press");    //do something here  };};