填充複選框與光標產生錯誤

Question

我填充有複選框，按鈕和列表視圖從數據庫得到填充的列表視圖中的字符串。

寄託都工作正常，我，直到我試圖從數據庫中讀取行值設置爲複選框的文本，用Google搜索了很多，但執行不能從填充數據庫中的值來檢查框中的文本。

下面是我的代碼：我在這裏只retriving一個有大約10條記錄

public class stockmanager extends Activity{ 

    /*public stockmanager() { 
     // TODO Auto-generated constructor stub 
     populatelist pl=new populatelist(); 
     //pl.getView(position, getCurrentFocus(), null); 
    }*/ 
    String getentry; 
    private int storeID=0; 
    Database d; 
    StockTable st; 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.stockmanager); 
     d=new Database(getApplicationContext()); 
     st=new StockTable(getApplicationContext()); 
    final Button AddStock=(Button) findViewById(R.id.button1); 
     final EditText entry=(EditText) findViewById(R.id.editText1); 
     final Button BroDetail=(Button) findViewById(R.id.button2); 
     final ListView popstocks=(ListView) findViewById(R.id.listView1); 

     AddStock.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 

       getentry=entry.getText().toString(); 
       //st.insert(getentry); 
       System.out.println(getentry); 
       //d.db.rawQuery(st.select(), null); 
       d.db.insert(st.tablename, null,st.insert(getentry)); 
       populatelist populatestocks=new populatelist(); 
       popstocks.setAdapter(populatestocks); 

      } 
     }); 
       } 


    public class populatelist extends BaseAdapter{ 

     StockTable st1=new StockTable(getApplicationContext()); 
     Database d1=new Database(getApplicationContext()); 
     private String getstocks="Select "+ st1.column2 + " From "+ st1.tablename; 
     private Cursor a1; 
     @Override 
     public int getCount() { 
      // TODO Auto-generated method stub 
      a1=d.db.rawQuery(getstocks, null); 
      return a1.getCount(); 
     } 

     @Override 
     public Object getItem(int arg0) { 
      // TODO Auto-generated method stub 
      return arg0; 
     } 

     @Override 
     public long getItemId(int position) { 
      // TODO Auto-generated method stub 
      return position; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      // TODO Auto-generated method stub 
      if(convertView==null){ 

       convertView=getLayoutInflater().inflate(R.layout.stocklist,null); 
      } 

      final CheckBox cb=(CheckBox) findViewById(R.id.checkBox1); 
      final Button view=(Button) findViewById(R.id.button1); 


      if(a1.moveToFirst()){ 

      cb.setText(a1.getString(a1.getColumnIndex(st1.column2))); 


      } 
      return convertView; 
     } 


    } 

    public void Declerations(){ 


    } 


} 

登錄貓

02-09 17:02:28.391: D/libEGL(19478): loaded /system/lib/egl/libEGL_genymotion.so 
02-09 17:02:28.455: D/(19478): HostConnection::get() New Host Connection established 0xb8ad4fc8, tid 19478 
02-09 17:02:28.499: D/libEGL(19478): loaded /system/lib/egl/libGLESv1_CM_genymotion.so 
02-09 17:02:28.523: D/libEGL(19478): loaded /system/lib/egl/libGLESv2_genymotion.so 
02-09 17:02:28.927: W/EGL_genymotion(19478): eglSurfaceAttrib not implemented 
02-09 17:02:28.959: E/OpenGLRenderer(19478): Getting MAX_TEXTURE_SIZE from GradienCache 
02-09 17:02:29.011: E/OpenGLRenderer(19478): Getting MAX_TEXTURE_SIZE from Caches::initConstraints() 
02-09 17:02:29.011: D/OpenGLRenderer(19478): Enabling debug mode 0 
02-09 17:02:34.215: W/EGL_genymotion(19478): eglSurfaceAttrib not implemented 
02-09 17:02:40.079: D/dalvikvm(19478): GC_FOR_ALLOC freed 105K, 1% free 16944K/17072K, paused 73ms, total 76ms 
02-09 17:02:40.331: W/EGL_genymotion(19478): eglSurfaceAttrib not implemented 
02-09 17:02:40.631: I/System.out(19478): sdef 
02-09 17:02:40.631: I/System.out(19478): Select Max(Stock_ID) from StockTable 
02-09 17:02:40.647: I/System.out(19478): 1 
02-09 17:02:40.727: I/System.out(19478): Has Values 
02-09 17:02:41.271: D/AndroidRuntime(19478): Shutting down VM 
02-09 17:02:41.295: W/dalvikvm(19478): threadid=1: thread exiting with uncaught exception (group=0xa4c44648) 
02-09 17:02:41.359: E/AndroidRuntime(19478): FATAL EXCEPTION: main 
02-09 17:02:41.359: E/AndroidRuntime(19478): java.lang.NullPointerException 
02-09 17:02:41.359: E/AndroidRuntime(19478): at com.example.portfoliomanager.stockmanager$populatelist.getView(stockmanager.java:96) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.widget.AbsListView.obtainView(AbsListView.java:2177) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.widget.ListView.makeAndAddView(ListView.java:1840) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.widget.ListView.fillDown(ListView.java:675) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.widget.ListView.fillFromTop(ListView.java:736) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.widget.ListView.layoutChildren(ListView.java:1655) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.widget.AbsListView.onLayout(AbsListView.java:2012) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.View.layout(View.java:14289) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.ViewGroup.layout(ViewGroup.java:4562) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.View.layout(View.java:14289) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.ViewGroup.layout(ViewGroup.java:4562) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.View.layout(View.java:14289) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.ViewGroup.layout(ViewGroup.java:4562) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at com.android.internal.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:349) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.View.layout(View.java:14289) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.ViewGroup.layout(ViewGroup.java:4562) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.widget.FrameLayout.onLayout(FrameLayout.java:448) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.View.layout(View.java:14289) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.ViewGroup.layout(ViewGroup.java:4562) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1976) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1730) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.Choreographer.doFrame(Choreographer.java:532) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.os.Handler.handleCallback(Handler.java:730) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.os.Handler.dispatchMessage(Handler.java:92) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.os.Looper.loop(Looper.java:137) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at android.app.ActivityThread.main(ActivityThread.java:5103) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at java.lang.reflect.Method.invokeNative(Native Method) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at java.lang.reflect.Method.invoke(Method.java:525) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
02-09 17:02:41.359: E/AndroidRuntime(19478): at dalvik.system.NativeStart.main(Native Method) 
02-09 17:02:46.431: I/Process(19478): Sending signal. PID: 19478 SIG: 9 
02-09 17:02:49.055: D/libEGL(19514): loaded /system/lib/egl/libEGL_genymotion.so 
02-09 17:02:49.079: D/(19514): HostConnection::get() New Host Connection established 0xb8ad4d00, tid 19514 
02-09 17:02:49.187: D/libEGL(19514): loaded /system/lib/egl/libGLESv1_CM_genymotion.so 
02-09 17:02:49.191: D/libEGL(19514): loaded /system/lib/egl/libGLESv2_genymotion.so 
02-09 17:02:49.483: W/EGL_genymotion(19514): eglSurfaceAttrib not implemented 
02-09 17:02:49.515: E/OpenGLRenderer(19514): Getting MAX_TEXTURE_SIZE from GradienCache 
02-09 17:02:49.599: E/OpenGLRenderer(19514): Getting MAX_TEXTURE_SIZE from Caches::initConstraints() 
02-09 17:02:49.599: D/OpenGLRenderer(19514): Enabling debug mode 0 

請建議我的出路列值。

感謝 溼婆

Answer 1

變化

final CheckBox cb=(CheckBox) findViewById(R.id.checkBox1); 
final Button view=(Button) findViewById(R.id.button1); 

到

final CheckBox cb=(CheckBox) convertView.findViewById(R.id.checkBox1); 
final Button view=(Button) convertView.findViewById(R.id.button1); 

你checkBox1和button1是R.layout.stocklist和你在convertView膨脹，所以你需要從convertView

找到他們