Android：线程ID = 1：线程退出与未捕获的异常（组= 0xb3d17b20）

Question

我不知道为什么这种情况继续发生。花了很多时间试图弄清楚这一点。尽管有很多类似的问题已经问过。

仅发布相关代码。

Convo1.java

public class Convo1 extends Activity { 
Convo1 convo; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_convo1); 
    convo=this; 
    SetQn.setquestion(convo); 
} 

SetQn.java

public class SetQn extends Application { 
public static void setquestion(Activity activity){ 

    String getqn = GetConvo.getqn(activity); 
} 

GetConvo.java

public class GetConvo extends Activity { 

public static String getqn(Activity activity) { 
int newqn=activity.getResources().getIdentifier("a", "string","com.kings.englishforretail"); 
String opt1 = activity.getString(newqn); 
return opt1; 
} 

logcat的

11-24 06:32:26.559: D/dalvikvm(6992): GC_FOR_ALLOC freed 83K, 5% free 2842K/2980K, paused 2ms, total 4ms 
11-24 06:32:26.559: I/dalvikvm-heap(6992): Grow heap (frag case) to 3.733MB for 950412-byte allocation 
11-24 06:32:26.579: D/dalvikvm(6992): GC_FOR_ALLOC freed 7K, 4% free 3763K/3912K, paused 18ms, total 18ms 
11-24 06:32:26.609: D/dalvikvm(6992): GC_FOR_ALLOC freed 2K, 4% free 3777K/3912K, paused 2ms, total 2ms 
11-24 06:32:26.609: I/dalvikvm-heap(6992): Grow heap (frag case) to 4.581MB for 880892-byte allocation 
11-24 06:32:26.629: D/dalvikvm(6992): GC_FOR_ALLOC freed <1K, 3% free 4637K/4776K, paused 18ms, total 18ms 
11-24 06:32:26.629: W/string(6992): 2131361805 
11-24 06:32:26.639: D/AndroidRuntime(6992): Shutting down VM 
11-24 06:32:26.639: W/dalvikvm(6992): threadid=1: thread exiting with uncaught exception (group=0xb3d17b20) 
11-24 06:32:26.639: E/AndroidRuntime(6992): FATAL EXCEPTION: main 
11-24 06:32:26.639: E/AndroidRuntime(6992): Process: com.kings.englishforretail, PID: 6992 
11-24 06:32:26.639: E/AndroidRuntime(6992): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.kings.englishforretail/com.kings.englishforretail.Convo1}: java.lang.NullPointerException 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.app.ActivityThread.access$800(ActivityThread.java:135) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.os.Handler.dispatchMessage(Handler.java:102) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.os.Looper.loop(Looper.java:136) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.app.ActivityThread.main(ActivityThread.java:5017) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at java.lang.reflect.Method.invokeNative(Native Method) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at java.lang.reflect.Method.invoke(Method.java:515) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at dalvik.system.NativeStart.main(Native Method) 
11-24 06:32:26.639: E/AndroidRuntime(6992): Caused by: java.lang.NullPointerException 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at com.kings.englishforretail.SetQn.setquestion(SetQn.java:21) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at com.kings.englishforretail.Convo1.onCreate(Convo1.java:34) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.app.Activity.performCreate(Activity.java:5231) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
11-24 06:32:26.639: E/AndroidRuntime(6992):  ... 11 more 

编辑：

获取正确的输出

int newqn=activity.getResources().getIdentifier("a","string","com.kings.englishforretail"); 

它只是

activity.getString(newqn); 

，让我的错误。

Answer 1

SetQn.setquestion（convo）; //这里康沃可能会返回错误的上下文

你可以试试下面的

SetQn.setquestion（本）;