Java Android:thread id=1:线程退出时出现未捕获异常（组=0xb3d17b20）

我不明白为什么会发生这种情况。我花了很多时间试图弄明白。尽管已经有很多类似的问题被问到了

只发布相关代码

1.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);
}

getconva.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

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

只是

activity.getString(newqn); 

这给了我一个错误

SetQn.setquestion（conva）；//在这里，conva可能返回了错误的上下文

你可以试试下面的方法

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设置问题（本）

什么是conval1.java:34这里？？？@PrinceThomas:SetQn.setquestion（conva）；你申请表的第21行是什么class@Elltz：字符串getqn=getconva.getqn（活动）；我已经添加了所有提到的行。如果只是这样，请尝试String yourstring=activity.getResources（）。getString（getResources（）.getIdentifier（“propertyName”，“String”，activity.getPackageName（）））propertyName是字符串的键名。他将此分配给了Conva！

activity.getString(newqn);