当试图从gridview面临错误打开一个活动时

时间:2013-10-12 06:58:09

标签: android gridview

当试图打开一个活动时,它显示错误,表示活动无法实例化。我有一个gridview,它必须打开不同的活动,当gridview处于mainactivity时,没有问题但是当网格视图在另一个活动中时,问题是araises

package com.guru.finalpro1;

公共类Level1扩展Activity实现AdapterView.OnItemClickListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_level1);
    GridView gva= (GridView)findViewById(R.id.gridView1);


    gva.setAdapter(new ImageAdaptera(getApplicationContext()));
     gva.setOnItemClickListener(this);

}

@Override
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
       switch(position){
            case 0:

              {

                    Intent intenta = new Intent (Level1.this, AA.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);


                    startActivityForResult(intenta,0);

                }

                break;

            case 1:
            {
                Intent intentb = new Intent (Level1.this, AB.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivityForResult(intentb,0);
            }
               break;


      case 2:
    {
        Intent intentc = new Intent (getBaseContext(), AC.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
       startActivityForResult(intentc,0);
    }
   break;

案例3:     {         Intent intentd = new Intent(getBaseContext(),AD.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);        startActivityForResult(intentd,0);     }    打破;

案例4:         {             Intent intente = new Intent(getBaseContext(),AE.class).setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);           startActivityForResult(intente,0);         }       打破;

      }}

错误:

10-12 04:55:13.543:E / AndroidRuntime(1145):致命异常:主要 10-12 04:55:13.543:E / AndroidRuntime(1145):java.lang.RuntimeException:无法实例化活动ComponentInfo {com.guru.finalpro1 / com.guru.finalpro1.AA}:java.lang.NullPointerException 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2137) 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.app.ActivityThread.access $ 600(ActivityThread.java:141) 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1256) 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.os.Handler.dispatchMessage(Handler.java:99) 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.os.Looper.loop(Looper.java:137) 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.app.ActivityThread.main(ActivityThread.java:5103) 10-12 04:55:13.543:E / AndroidRuntime(1145):at java.lang.reflect.Method.invokeNative(Native Method) 10-12 04:55:13.543:E / AndroidRuntime(1145):at java.lang.reflect.Method.invoke(Method.java:525) 10-12 04:55:13.543:E / AndroidRuntime(1145):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:737) 10-12 04:55:13.543:E / AndroidRuntime(1145):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-12 04:55:13.543:E / AndroidRuntime(1145):at dalvik.system.NativeStart.main(Native Method) 10-12 04:55:13.543:E / AndroidRuntime(1145):引起:java.lang.NullPointerException 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.app.Activity.findViewById(Activity.java:1853) 10-12 04:55:13.543:E / AndroidRuntime(1145):at com.guru.finalpro1.AA。(AA.java:26) 10-12 04:55:13.543:E / AndroidRuntime(1145):at java.lang.Class.newInstanceImpl(Native Method) 10-12 04:55:13.543:E / AndroidRuntime(1145):at java.lang.Class.newInstance(Class.java:1130) 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.app.Instrumentation.newActivity(Instrumentation.java:1061) 10-12 04:55:13.543:E / AndroidRuntime(1145):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2128) 10-12 04:55:13.543:E / AndroidRuntime(1145):... 11更多

0 个答案:

没有答案