以上一篇為例，還需準備一個共用class，在共用的class裡設置一個int count = 0;
當點擊硬體鍵時，共用class裡的count++，再搭配cTimer.schedule(cTimerTask,500);
執行後500毫秒才開始判斷count ==1 或==2 在傳遞訊息給主程式執行播放、暫停、下一首。
首先要在MainFest添加共用class:
<application
android:name=".PP"
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:launchMode="singleInstance" >
<activity
.
.
共用class:
public class PP extends Application {
int count =0;
private MyHandler handler ;
// 傳遞訊息的方法
public void setHandler(MyHandler handler) {
this.handler = handler;
}
// 得到訊息方法
public MyHandler getHandler() {
return handler;
}
//點擊硬體鍵count++
public void addcount(){
count++;
}
//得到硬體鍵點擊的次數
public int getcount(){
return count;
}
//回復count初始化
public void recovercount(){
count = 0;
}
}
BroadcastReceiver.java
public class MediaButtonReceiver extends BroadcastReceiver {
private static final String TAG = "MediaButtonReceiver";
private PP pp ; //共用class
private static final int CHANGED = 0x0010;
private static final int CHANGEDNEXTSONG = 0x0011;
private MyHandler mHandler ;
private boolean isStart = true;
private Timer cTimer = null;
@Override
public void onReceive(final Context context, Intent intent) {
// 獲得Action
String intentAction = intent.getAction();
// 獲得KeyEvent对象
KeyEvent keyEvent = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
// 按下 / 鬆開按鈕
int keyAction = keyEvent.getAction();
pp = (PP)context.getApplicationContext();
mHandler = pp.getHandler();
if (Intent.ACTION_MEDIA_BUTTON.equals(intentAction) && (KeyEvent.ACTION_DOWN == keyAction)) {
// 獲得按鍵字節碼
int keyCode = keyEvent.getKeyCode();
if (KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE == keyCode) {
}
if (KeyEvent.KEYCODE_HEADSETHOOK == keyCode) {
pp.addcount();
if (cTimer == null){
cTimer = new Timer();
cTimer.schedule(cTimerTask,500);
}
cTimer=null;
}
if (KeyEvent.KEYCODE_MEDIA_PREVIOUS == keyCode) {
}
if (KeyEvent.KEYCODE_MEDIA_STOP == keyCode) {
}
// 輸出點擊的按鍵碼
} else if (KeyEvent.ACTION_UP == keyAction) {
}
}
private TimerTask cTimerTask = new TimerTask() {
@Override
public void run() {
isStart = true;
if (isStart) {
if (pp.getcount() == 1 ){
// 發送消息，判斷當點1下，發送CHANGED到class，再由Activity接收
mHandler.sendEmptyMessage(CHANGED);
} else if (pp.getcount() == 2 || pp.getcount() > 2){
// 發送消息，判斷當點2下，發送CHANGEDNEXTSONG到class，再由 Activity接收
mHandler.sendEmptyMessage(CHANGEDNEXTSONG);
}
pp.recovercount();//初始化共用count=0;
}
isStart = false;
}
};
}
Activity.java
public class PlayListActivity extends Activity {
private static final int CHANGED = 0x0010;
private static final int CHANGEDNEXTSONG = 0x0011;
private MyHandler handler ;
.
.
略
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.playlist);
listView = (ListView) findViewById(R.id.listView);
imgFront = (ImageView) findViewById(R.id.front);
imgPlay = (ImageView) findViewById(R.id.play);
imgPause = (ImageView) findViewById(R.id.pause);
.
.
.
略
pp = (PP) getApplicationContext();
handler = new MyHandler();{
pp.setHandler(handler);
}
.
.
.
略
public class MyHandler extends Handler {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if(msg.what == CHANGED) {
// 當接收的訊息為CHANGED，也就是點一下，播放歌曲
}
} else if (msg.what == CHANGEDNEXTSONG){
// 當接收的訊息為CHANGEDNEXTSONG，也就是點兩下，下一首
}
}
}
