android 应用程序可以只有广播接收器和服务而没有 Activity 吗? 如果这是可能的,我该如何调用广播接收器? Android 系统自动调用 broadcsat 接收器 ?
Broadcastreceiver代码
public class CheckReceiver extends BroadcastReceiver {
public Context con;
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Toast.makeText(context, "Received", Toast.LENGTH_LONG).show();
// add PhoneStateListener
PhoneCallListener phoneListener = new PhoneCallListener();
TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
telephonyManager.listen(phoneListener,
PhoneStateListener.LISTEN_CALL_STATE);
con = context;
}
class PhoneCallListener extends PhoneStateListener {
private boolean isPhoneCalling = false;
String LOG_TAG = "LOGGING 123";
@Override
public void onCallStateChanged(int state, String incomingNumber) {
if (TelephonyManager.CALL_STATE_RINGING == state) {
// phone ringing
Log.i(LOG_TAG, "RINGING, number: " + incomingNumber);
}
if (TelephonyManager.CALL_STATE_OFFHOOK == state) {
// active
Log.i(LOG_TAG, "OFFHOOK");
isPhoneCalling = true;
}
if (TelephonyManager.CALL_STATE_IDLE == state) {
// run when class initial and phone call ended, need detect flag
// from CALL_STATE_OFFHOOK
Log.i(LOG_TAG, "IDLE");
if (isPhoneCalling) {
Log.i(LOG_TAG, "restart app");
Intent start = new Intent(con, CheckService.class);
con.startService(start);
isPhoneCalling = false;
}
}
}
}
}
服务准则是
public class CheckService extends Service{
@Override
public IBinder onBind(Intent arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onStart(Intent intent, int startId) {
// TODO Auto-generated method stub
super.onStart(intent, startId);
Intent dialogIntent = new Intent(CheckService.this,SmartDialog.class);
dialogIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(dialogIntent);
//Toast.makeText(CheckService.this, "Serive", Toast.LENGTH_LONG).show();
}
}
Android list 文件是
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mkyong.android"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.CALL_PHONE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<receiver android:name="CheckReceiver"></receiver>
<service android:name="CheckService"></service>
<activity android:name="SmartDialog" android:theme="@android:style/Theme.Dialog"></activity>
</application>
当我尝试运行此代码时,接收器未启动。任何帮助都会非常有帮助
最佳答案
从 Honeycomb 开始,BroadcastReceivers 以停止状态安装,并且在应用程序实际运行之前不会触发,即您需要一个 Activity 至少运行一次。这篇 Commonsware 博客文章对此进行了深入解释:
关于android - android应用程序可以只有广播接收器和没有 Activity 的服务吗,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12315325/