Question

我的上一个主题：How to finish activity in broadcastreceiver onCallEnded()

尝试将侦听器移动到IncomingCallActivity，因此编辑了IcomingCallReceiver：

public class IncomingCallReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {


        Intent i = new Intent(context, IncomingCallActivity.class);  
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
        context.startActivity(i); }

现在开始新活动时获得NullPointerExeption ...有什么想法？

logcat的

   FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at IncomingCallActivity.onCreate(IncomingCallActivity.java:34)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
    ... 11 more

使用此代码：

公共类IncomingCallReceiver扩展了BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
     SipAudioCall incomingCall = null;
    try {

        SipAudioCall.Listener listener = new SipAudioCall.Listener() {

            ...

            @Override
            public void onCallEnded(SipAudioCall call) {

             // IncomingCallActivity.finish();

            }
        };

        Main mainActivity = (Main) context;
        incomingCall = mainActivity.manager.takeAudioCall(intent, listener);
        mainActivity.call = incomingCall;

        Intent i = new Intent(context, IncomingCallActivity.class);  
        i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
        context.startActivity(i);

活动没有遇到麻烦，但我需要将听众转移到IncomingCallActivity

Answer 1

看这里：

检查IncomingCallActivity活动中的第34行并粘贴IncomingCallActivity活动代码。

Answer 2

Caused by: java.lang.NullPointerException
at IncomingCallActivity.onCreate(IncomingCallActivity.java:34)

在onCreate（）方法中查看IncomingCallActivity中的34行。

祝你好运！

启动新Activity时出现NullPointerException

2 个答案: