源代码如下：
1 public class ReceiveHandler extends BroadcastReceiver{ 2 3 private final String ACTION_RECE_LinkReply="com.hutao.linkRequestReceive"; 4 private Context context; 5 private int ReceiveNumber; 6 private byte businessType; 7 @Override 8 public void onReceive(Context context, Intent intent) { 9 // TODO Auto-generated method stub 10 this.context=context; 11 if (intent.getAction().equals(ACTION_RECE_LinkReply)) { 12 ReceiveNumber=intent.getIntExtra("number", 0); 13 businessType=intent.getByteExtra("businessType", (byte) 0); 14 switch (businessType) { 15 case DataReceive.AUDIO_CONNECT: 16 audioHandle(); 17 break; 18 19 default: 20 break; 21 } 22 23 } 24 25 } 26 private void audioHandle() { 27 // TODO Auto-generated method stub 28 AlertDialog builder=new AlertDialog.Builder(context).setTitle("注意：") 29 .setIcon(R.drawable.dailog_icon) 30 .setMessage("MS0"+ReceiveNumber+"请求建立语音连接,是否同意？") 31 .setPositiveButton("同意", new DialogInterface.OnClickListener() { 32 33 @Override 34 public void onClick(DialogInterface arg0, int arg1) { 35 // TODO Auto-generated method stub 36 /*发送语音连接请求，同意接收*/ 37 System.out.println("进入语音连接请求中……………………"); 38 new Thread(new DataSend(CreateSignal.LinkReply(businessType))).start();/*发送连接请求同意信令，businessType业务类型*/ 39 new Thread(new DataSend(CreateSignal.AudioReceive())).start();/*发送音频接收操作命令*/ 40 Intent audioIntent=new Intent(context,PhoneInterface.class); 41 audioIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 42 context.startActivity(audioIntent); 43 } 44 }) 45 .setNegativeButton("取消", new DialogInterface.OnClickListener() { 46 47 @Override 48 public void onClick(DialogInterface arg0, int arg1) { 49 // TODO Auto-generated method stub 50 51 } 52 }).create(); 53 builder.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); 54 builder.show(); 55 } 56 57 }
在没有audioIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);这句时候程序会报错，报错内容如下：
1 06-28 11:24:40.359: E/AndroidRuntime(7397): android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want? 2 06-28 11:24:40.359: E/AndroidRuntime(7397): at android.app.ContextImpl.startActivity(ContextImpl.java:617) 3 06-28 11:24:40.359: E/AndroidRuntime(7397): at android.content.ContextWrapper.startActivity(ContextWrapper.java:258) 4 06-28 11:24:40.359: E/AndroidRuntime(7397): at com.hotalk.ui.homepage.favorites.FavoritesListAdapter$7.onClick(FavoritesListAdapter.java:1509) 5 06-28 11:24:40.359: E/AndroidRuntime(7397): at android.view.View.performClick(View.java:2408) 6 06-28 11:24:40.359: E/AndroidRuntime(7397): at android.view.View$PerformClick.run(View.java:8816) 7 06-28 11:24:40.359: E/AndroidRuntime(7397): at android.os.Handler.handleCallback(Handler.java:587) 8 06-28 11:24:40.359: E/AndroidRuntime(7397): at android.os.Handler.dispatchMessage(Handler.java:92) 9 06-28 11:24:40.359: E/AndroidRuntime(7397): at android.os.Looper.loop(Looper.java:123) 10 06-28 11:24:40.359: E/AndroidRuntime(7397): at android.app.ActivityThread.main(ActivityThread.java:4627) 11 06-28 11:24:40.359: E/AndroidRuntime(7397): at java.lang.reflect.Method.invokeNative(Native Method) 12 06-28 11:24:40.359: E/AndroidRuntime(7397): at java.lang.reflect.Method.invoke(Method.java:521) 13 06-28 11:24:40.359: E/AndroidRuntime(7397): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 14 06-28 11:24:40.359: E/AndroidRuntime(7397): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 15 06-28 11:24:40.359: E/AndroidRuntime(7397): at dalvik.system.NativeStart.main(Native Method)
报错的原因：
Caused by: android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want?
Context中有一个startActivity方法，Activity继承Context，重载了startActivity方法。如果使用的startActivity方法，不会有任何限制，而如果使用Context的startActivity方法的话，就需要开启一个新的task,遇到上面那个异常的，都是因为使用了Context的startActivity方法。解决办法是：加一个flag，audioIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);