Android的：如何在AlertDialog

Question

有圖像複選框的名單，我需要我的AlertDialog像上面的圖像，但使用複選框

我測試過這個Post，我不得不創建以下代碼

animal_text.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout android:padding="10dp" android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="horizontal"  android:id="@+id/layout_root" xmlns:android="http://schemas.android.com/apk/res/android"> 

<CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:id="@+id/miastorow_text" 
    android:layout_width="fill_parent" 
    android:layout_height="?android:attr/listPreferredItemHeight" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:gravity="center_vertical" 
    android:checkMark="?android:attr/listChoiceIndicatorMultiple" 
    android:paddingLeft="6dip" 
    android:paddingRight="6dip" 
    android:textColor="#000"/> 
</LinearLayout> 

main.xml中

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

<Button 
    android:id="@+id/button1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="Button" /> 

</LinearLayout> 

ImageActivity.java

package com.imagetest; 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.DialogInterface.OnClickListener; 
import android.graphics.drawable.Drawable; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.CheckedTextView; 
import android.widget.ListAdapter; 

public class ImageActivity extends Activity { 
    /** Called when the activity is first created. */ 
    private static final String TAG = "HelloWorld"; 
    Animal[] _animals; 
    Button btnStart; 
    public static int count =0; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     System.out.println("on create"); 
     setContentView(R.layout.main); 
     loadAnimals(); 
     btnStart = (Button)findViewById(R.id.button1); 
     final Button button = (Button) findViewById(R.id.button1); 
     button.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       System.out.println("##########"); 
       handlePush(v); 
      } 
     }); 
     //btnStart.setOnClickListener((android.view.View.OnClickListener) btnStartListener); 
     System.out.println("on create after main"); 
     System.out.println("on create before load animals"); 

    } 

    private void loadAnimals() { 
     System.out.println("########## 1 "); 
     _animals = new Animal[3]; 

     // define the display string, the image, and the value to use 
     // when the choice is selected 
     _animals[0] = new Animal("dog", getImg(R.drawable.dog),"dog_sitting"); 
     _animals[1] = new Animal("cat", getImg(R.drawable.cat),"cat_sitting"); 
     _animals[1] = new Animal("bird", getImg(R.drawable.bird),"bird_sitting"); 

    } 

    private Drawable getImg(int res) 
    { 
     System.out.println("########## 3 "); 
     Drawable img = getResources().getDrawable(res); 
     img.setBounds(0, 0, 48, 48); 
     return img; 
    } 

    public void handlePush(View target) { 
    System.out.println("########## button clicked handle push"); 
    // define the list adapter with the choices 
     ListAdapter adapter = new AnimalAdapter(this, _animals); 

     final AlertDialog.Builder ad = new AlertDialog.Builder(this); 
     // define the alert dialog with the choices and the action to take 
     // when one of the choices is selected 
     ad.setSingleChoiceItems(adapter, -1, new OnClickListener() { 
      public void onClick(DialogInterface dialog, int which) { 
       // a choice has been made! 
       String selectedVal = _animals[which].getVal(); 
       Log.d(TAG, "chosen " + selectedVal); 
       dialog.dismiss(); 
      } 
     }); 
     ad.show(); 
    } 

    static class AnimalAdapter extends ArrayAdapter<Animal> { 

     private static final int RESOURCE = R.layout.animal_text; 
     private LayoutInflater inflater; 

     static class ViewHolder { 
      CheckedTextView nameTxVw; 
     } 

     //@SuppressWarnings("unchecked") 
     public AnimalAdapter(Context context, Animal[] objects) 
     { 
      super(context, RESOURCE, objects); 
      inflater = LayoutInflater.from(context); 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) 
     { 
      count=count+1; 
      System.out.println("################ "+count+" position "+position+" parent "+parent); 
      ViewHolder holder; 
      System.out.println("########## getview outside if 1 "+count); 
      if (convertView == null) { 
       System.out.println("########## getview if 1 "+count); 
       // inflate a new view and setup the view holder for future use 
       convertView = inflater.inflate(RESOURCE, null); 

       holder = new ViewHolder(); 
       holder.nameTxVw = 
        (CheckedTextView) convertView.findViewById(R.id.miastorow_text); 
       convertView.setTag(holder); 
      } else { 
       System.out.println("########## getview else 1 "+count+" convert "+convertView.toString()); 
       // view already defined, retrieve view holder 
       holder = (ViewHolder) convertView.getTag(); 
      } 

      Animal cat = (Animal) getItem(position); 
      if (cat == null) { 
       System.out.println("########## getview if 2"); 
       //Log.e(TAG, 「Invalid category for position: 」+position); 
      } 
      holder.nameTxVw.setText(cat.getName()); 
      holder.nameTxVw.setCompoundDrawables(cat.getImg(), null, null, null); 

      return convertView; 
     } 
    } 



    class Animal { 
     private String _name; 
     private Drawable _img; 
     private String _val; 

     public Animal(String name, Drawable img, String val) { 

      System.out.println("########## 2"); 
      _name = name; 
      _img = img; 
      _val = val; 
     } 

     public String getName() { 
      return _name; 
     } 

     public Drawable getImg() { 
      return _img; 
     } 

     public String getVal() { 
      return _val; 
     } 
    }  

} 

我得到一個空指針異常 ..我不知道如何解決它，IAM新到Android。 PLZ儘快幫助我。

而且我logcat的詳情如下

07-26 12:14:12.436: DEBUG/AndroidRuntime(13275): Shutting down VM 
07-26 12:14:12.436: WARN/dalvikvm(13275): threadid=1: thread exiting with uncaught exception (group=0x400205a0) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275): FATAL EXCEPTION: main 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275): java.lang.NullPointerException 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at com.imagetest.ImageActivity$AnimalAdapter.getView(ImageActivity.java:130) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.AbsListView.obtainView(AbsListView.java:1409) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1264) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.ListView.onMeasure(ListView.java:1127) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.View.measure(View.java:8526) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3228) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.View.measure(View.java:8526) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3228) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:386) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:309) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at com.android.internal.widget.WeightedLinearLayout.onMeasure(WeightedLinearLayout.java:60) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.View.measure(View.java:8526) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3228) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.View.measure(View.java:8526) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3228) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:250) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.View.measure(View.java:8526) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.ViewRoot.performTraversals(ViewRoot.java:902) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1957) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.os.Looper.loop(Looper.java:150) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at android.app.ActivityThread.main(ActivityThread.java:4277) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at java.lang.reflect.Method.invoke(Method.java:507) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
07-26 12:14:12.456: ERROR/AndroidRuntime(13275):  at dalvik.system.NativeStart.main(Native Method) 
07-26 12:14:12.476: WARN/ActivityManager(124): Force finishing activity com.imagetest/.ImageActivity 
07-26 12:14:12.976: WARN/ActivityManager(124): Activity pause timeout for HistoryRecord{4081ff48 com.imagetest/.ImageActivity} 
07-26 12:14:13.056: INFO/CarouselTimeLog(259): onStart() finish: 1343285053068 

Answer 1

//你是錯誤的複製粘貼

_animals[0] = new Animal("dog", getImg(R.drawable.dog),"dog_sitting"); 
_animals[1] = new Animal("cat", getImg(R.drawable.cat),"cat_sitting"); 
_animals[1] = new Animal("bird", getImg(R.drawable.bird),"bird_sitting"); 

//變化如下 _animals [2] =新的動物（ 「鳥」 ，getImg（R.drawable.bird），「bird_sitting」）;

//刪除任何一個線下

btnStart = (Button)findViewById(R.id.button1); 
final Button button = (Button) findViewById(R.id.button1);