不能在自定义微调的Android

设置文本在这里我只是想设置文本视图文本在旋转的Android，文字是从数据库中获取，但它总是错误java.lang.NullPointerExeception。这是我的活动。 Erorr登录下面的代码。不能在自定义微调的Android

public class Front_end_akreditasi extends Activity { 

    private DBDataSource dataSource; 
MyAdapter spn; 
    // Spinner element 
Spinner spinner; 
ArrayList<Akreditasi> dataArr = new ArrayList<Akreditasi>(); 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.front_end_akreditasi); 

      dataSource = new DBDataSource(this); 


      dataSource.open(); 

      spinner = (Spinner) findViewById(R.id.spinner_show); 


      ArrayList<Akreditasi> values = dataSource.getnama_Akreditasi(); 
      for (Akreditasi cn : values) 
      { 
       String log = "ID :" + cn.getId() + "Name: " + cn.getNama(); 
       Log.d("Result: ", log); 
       dataArr.add(cn); 

       spn = new MyAdapter(this, R.layout.custom_spinner, dataArr); 
       spinner.setAdapter(spn); 
      } 
     } 
     public class MyAdapter extends ArrayAdapter<Akreditasi> { 
     Context context; 
     int layoutResourceId; 
     ArrayList<Akreditasi> data = new ArrayList<Akreditasi>(); 
    public MyAdapter(Context ctx, int txtViewResourceId, ArrayList<Akreditasi> objects) 
      { 
       super(ctx, txtViewResourceId, objects); 
      this.layoutResourceId = txtViewResourceId; 
      this.context = ctx; 
      this.data = objects; 
    } 
    @Override 
    public View getDropDownView(int position, View cnvtView, ViewGroup prnt) { 
     return getCustomView(position, cnvtView, prnt); 
    } 

    @Override 
    public View getView(int pos, View cnvtView, ViewGroup prnt) { 
     return getCustomView(pos, cnvtView, prnt); 

    } 
      public View getCustomView(int position, View convertView, ViewGroup parent) 
    { 
     LayoutInflater inflater = getLayoutInflater(); 
     View mySpinner = inflater.inflate(R.layout.custom_spinner, parent,false); 

     ImageHolder holder = null; 

     if(mySpinner == null) 
     { 
      holder = new ImageHolder(); 
      holder.txtTitle  = (TextView)mySpinner.findViewById(R.id.text_main_seen); 
      holder.imgIcon  = (ImageView)mySpinner.findViewById(R.id.left_pic); 
      holder.txtName  = (TextView)mySpinner.findViewById(R.id.sub_text_seen); 
      mySpinner.setTag(holder); 
     } 
     else 
     { 

      holder = (ImageHolder)mySpinner.getTag(); 
     } 
     Akreditasi a = data.get(position); 
        //When i add this code below, then the program is error, it's says java.lang.NullPointerExeception 
     holder.txtTitle.setText("coba"); 
     return mySpinner; 

    } 
    class ImageHolder 
    { 
     ImageView imgIcon; 
     TextView txtTitle; 
     TextView txtName; 
    }

这里是我的custom_spinner.xml

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:orientation="vertical" 
android:padding="3px" > 

<ImageView 
    android:id="@+id/left_pic" 
    android:layout_width="100px" 
    android:layout_height="80px" 
    android:background="@drawable/ic_launcher" /> 

<TextView 
    android:id="@+id/text_main_seen" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginLeft="5px" 
    android:layout_marginTop="2px" 
    android:layout_toRightOf="@+id/left_pic" 
    android:padding="3px" 
    android:text="JMD Group" 
    android:textColor="#0022ee" 
    android:textSize="22px" 
    android:textStyle="bold" /> 

<TextView 
    android:id="@+id/sub_text_seen" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/text_main_seen" 
    android:layout_marginLeft="5dip" 
    android:layout_toRightOf="@+id/left_pic" 
    android:padding="2px" 
    android:text="beyond the expectations..." 
    android:textColor="#777777" /> 

</RelativeLayout>

，这里是我的日志

05-08 13:06:31.889: E/AndroidRuntime(16634): FATAL EXCEPTION: main 
    05-08 13:06:31.889: E/AndroidRuntime(16634): java.lang.NullPointerException 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at  com.example.frontend.category.search.Front_end_akreditasi$MyAdapter.getCustomView(Front_end  _akreditasi.java:165) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at  com.example.frontend.category.search.Front_end_akreditasi$MyAdapter.getView(Front_end_akred  itasi.java:138) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at  android.widget.AbsSpinner.onMeasure(AbsSpinner.java:193) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.widget.Spinner.onMeasure(Spinner.java:439) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.View.measure(View.java:15592) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.View.measure(View.java:15592) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.View.measure(View.java:15592) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.widget.LinearLayout.measureVertical(LinearLayout.java:847) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.View.measure(View.java:15592) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4825) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.widget.FrameLayout.onMeasure(FrameLayout.java:310) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2180) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.View.measure(View.java:15592) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1878) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1089) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1265) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4356) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.Choreographer.doCallbacks(Choreographer.java:562) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.Choreographer.doFrame(Choreographer.java:532) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.os.Handler.handleCallback(Handler.java:725) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.os.Handler.dispatchMessage(Handler.java:92) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.os.Looper.loop(Looper.java:137) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at android.app.ActivityThread.main(ActivityThread.java:5099) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at java.lang.reflect.Method.invokeNative(Native Method) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at java.lang.reflect.Method.invoke(Method.java:511) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:803) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:570) 
    05-08 13:06:31.889: E/AndroidRuntime(16634): at dalvik.system.NativeStart.main(Native Method)

来源

2014-05-08 ndr_sd

后错误日志..和点破线处空指针例外是 –

@RachitaNanda我已经做了，你能帮我吗？ –

@ndr_sd但你为什么要创建'getCustomView（....）'实现直接'getView（......）' –

尝试下面的代码。我想这应该有助于

 holder = new ImageHolder(); 
       holder.txtTitle  = (TextView)mySpinner.findViewById(R.id.text_main_seen); 
       holder.imgIcon  = (ImageView)mySpinner.findViewById(R.id.left_pic); 
       holder.txtName  = (TextView)mySpinner.findViewById(R.id.sub_text_seen);  

      if(mySpinner == null) 
      { 

       mySpinner.setTag(holder); 
      } 
      else 
      { 


       holder = (ImageHolder)mySpinner.getTag(); 
      } 
      Akreditasi a = data.get(position); 

      holder.txtTitle.setText("coba"); 
      return mySpinner; 

     }

的问题可能是holder.txtTitle仍然在其他情况下，空，你目前还没有找到通过ID其观点。

来源

2014-05-08 06:19:42

@RN这个_code_中有什么新东西？ –

持有者每次都被初始化，无论是if还是case。 –

@RachitaNanda：这很好，但为什么txtTitle变得空？你能向我解释一下吗？ ahhahahha –

我认为这是没有得到语境所以请使用下面的代码创建LayoutInflater

LayoutInflater mInflater = LayoutInflater.from(context);

，而不是这个，

LayoutInflater inflater = getLayoutInflater();

来源

2014-05-08 09:26:12 MFP

不能在自定义微调的Android

回答

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