Android 正在从服务启动已在运行的活动
我正在尝试制作锁屏,所以我在它里面制作了服务类n广播接收器和MainActivity。 它一直工作到屏幕关闭,whn屏幕打开时主要活动关闭并显示异常。 请帮我解决它 MyService.javaAndroid 正在从服务启动已在运行的活动,android,android-intent,service,broadcastreceiver,Android,Android Intent,Service,Broadcastreceiver,我正在尝试制作锁屏,所以我在它里面制作了服务类n广播接收器和MainActivity。 它一直工作到屏幕关闭,whn屏幕打开时主要活动关闭并显示异常。 请帮我解决它 MyService.java package com.example.broadcast_receiver; import android.app.Service; ... public class MyService extends Service { @Override public IBinder onBi
package com.example.broadcast_receiver;
import android.app.Service;
...
public class MyService extends Service {
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
Log.i("[myService]", "onCreate");
registerReceiver(mybroadcast, new IntentFilter(Intent.ACTION_SCREEN_ON));
registerReceiver(mybroadcast, new IntentFilter(Intent.ACTION_SCREEN_OFF));
}
@Override
public void onStart(Intent intent, int startId) {
Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
Log.i("[myService]", "onStart");
}
@Override
public void onDestroy() {
Toast.makeText(this, "MyService Stopped", Toast.LENGTH_LONG).show();
Log.i("[myService]", "onDestroy");
}
BroadcastReceiver mybroadcast = new BroadcastReceiver(){
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
Log.i("[BroadcastReceiver]", "MyReceiver");
if(intent.getAction().equals(Intent.ACTION_SCREEN_ON)){
Log.i("[BroadcastReceiver]", "Screen ON");
Intent i=new Intent(context, MainActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_PREVIOUS_IS_TOP);
context.startActivity(i);
}
else if(intent.getAction().equals(Intent.ACTION_SCREEN_OFF)){
Log.i("[BroadcastReceiver]", "Screen OFF");
}
}
};
}
MainActivity.java
package com.example.broadcast_receiver;
import android.os.Bundle;
...
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.i("[MainActivity]", "Created");
try{
boolean a=isMyServiceRunning();
if(a==false){
startService(new Intent(this,MyService.class));
}
}catch (Exception e) {
// TODO: handle exception
Log.i("Error", e.getMessage().toString());
Toast.makeText(this, e.getMessage().toString(), Toast.LENGTH_LONG).show();
}
}
private boolean isMyServiceRunning() {
ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
if (MyService.class.getName().equals(service.service.getClassName())) {
return true;
}
}
return false;
}
}
AndroidManifest.xml
(未添加用户权限)
请帮助我解决dis问题。错误告诉您,如果不设置
意图标志NEW\u TASK
,您就无法从活动
外部调用startActivity()
。在调用startActivity()之前,将Intent.FLAG\u ACTIVITY\u NEW\u TASK
添加到Intent
发布您的LogCat错误。另外,什么是上下文
?一个服务有它自己的上下文
,所以你应该能够使用MyService。这个
@TronicZomB u可以从下面的链接看到LogCat@codeMagic我没有使用新上下文,我只使用服务上下文,检查我是否将服务上下文名称作为上下文。Thnx,我jst从另一个链接找到了dis解决方案,即。
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<service android:name="com.example.broadcast_receiver.MyService"
android:label="@string/app_name"
android:icon="@drawable/ic_launcher" ></service>
<activity
android:name="com.example.broadcast_receiver.MainActivity"
android:label="@string/app_name"
android:launchMode="singleTop" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Intent i=new Intent(context, MainActivity.class);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);