APP給出錯誤，並停止在Android上工作

我檢查alert.class以查找錯誤，因爲logcat文件在啓動alert.class活動時顯示錯誤，但找不到任何錯誤。
下面是代碼：APP給出錯誤，並停止在Android上工作

public class alert extends Activity 
{ 
    Button button1; 
    Button button2; 

public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.alert); 
    button1 = (Button) findViewById(R.id.button1); 
    button2 = (Button) findViewById(R.id.button2); 

    button1.setOnClickListener(new OnClickListener() 
    { 
     public void onClick(View v1) 
     { 
     setContentView(R.layout.set); 
     Intent myIntent = new Intent(getApplicationContext(), set.class); 
     startActivity(myIntent); 

     } 
    }); 
    button2.setOnClickListener(new OnClickListener() 
    { 
     public void onClick(View v1) 
     { 
      setContentView(R.layout.set); 
      Intent myIntent = new Intent(getApplicationContext(), set.class); 
      startActivity(myIntent); 
     } 
    }); 
}

}

這是logcat的：

03-23 08:28:28.239: E/AndroidRuntime(463): FATAL EXCEPTION: main 
03-23 08:28:28.239: E/AndroidRuntime(463): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.indianic.demo.calendark/com.indianic.demo.calendark.alert}: java.lang.NullPointerException 
03-23 08:28:28.239: E/AndroidRuntime(463): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
03-23 08:28:28.239: E/AndroidRuntime(463): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
03-23 08:28:28.239: E/AndroidRuntime(463): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
03-23 08:28:28.239: E/AndroidRuntime(463): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
03-23 08:28:28.239: E/AndroidRuntime(463): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-23 08:28:28.239: E/AndroidRuntime(463): at android.os.Looper.loop(Looper.java:123) 
03-23 08:28:28.239: E/AndroidRuntime(463): at android.app.ActivityThread.main(ActivityThread.java:3683) 
03-23 08:28:28.239: E/AndroidRuntime(463): at java.lang.reflect.Method.invokeNative(Native Method) 
03-23 08:28:28.239: E/AndroidRuntime(463): at java.lang.reflect.Method.invoke(Method.java:507) 
03-23 08:28:28.239: E/AndroidRuntime(463): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
03-23 08:28:28.239: E/AndroidRuntime(463): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
03-23 08:28:28.239: E/AndroidRuntime(463): at dalvik.system.NativeStart.main(Native Method) 
03-23 08:28:28.239: E/AndroidRuntime(463): Caused by: java.lang.NullPointerException 
03-23 08:28:28.239: E/AndroidRuntime(463): at com.indianic.demo.calendark.alert.onCreate(alert.java:37) 
03-23 08:28:28.239: E/AndroidRuntime(463): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
03-23 08:28:28.239: E/AndroidRuntime(463): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
03-23 08:28:28.239: E/AndroidRuntime(463): ... 11 more

來源

2013-03-23 Metalhead1247

任何線37，這就是你的錯誤。你得到一個NPE。在你的帖子裏註釋，第37行是 – ElefantPhace 2013-03-23 03:23:44

類名不應該是小寫..他們應該是UpperCasedLikeThis。 – JoxTraex 2013-03-23 03:35:59

我在同一個應用程序中有很多課程，但是所有的活動都在正常工作 – Metalhead1247 2013-03-23 03:42:55

button1.setOnClickListener(new OnClickListener() 
{ 
    public void onClick(View v1) 
    { 
     // dont set layout here 
    Intent myIntent = new Intent(getApplicationContext(), set.class); 
    startActivity(myIntent); // after starting activity set.java it will create layout it self 

    } 
}); 
button2.setOnClickListener(new OnClickListener() 
{ 
    public void onClick(View v1) 
    { 

     Intent myIntent = new Intent(getApplicationContext(), set.class); 
     startActivity(myIntent); 
    } 
});

來源

2013-03-23 04:54:22 Shiv

APP給出錯誤，並停止在Android上工作

回答

相關問題