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新しいアクティビティをクリックして開くと、各行に5行を形成するlistactivityがあります。

（カスタマイズするために）それぞれに個別のクラスを設定したので、5つのクラスがあります：as（City1、City2、City3など）

各行クラスには多くのビューがあり、クリックするとボタンの1つがカスタマイズされた無限のギャラリーを開き、

putextra intentを使用して、この無限のギャラリーを5行のクラスに渡したい

しかし、アプリを実行すると、ボタンを押して無限のギャラリーを開きます（強制終了）

、私はアンドロイド開発の経験がほとんどありません、

私を助けてくれませんか、アドバイスをいただければ幸いです、ありがとう

私のコード：GalleryCityクラス 

 public class GalleryCity extends Activity {
  static String city;

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);

     Boolean customTitleSupported = requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); 
      // Set the layout to use
      setContentView(R.layout.main);
      if (customTitleSupported) { 
 getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.custom_title); 
    TextView tv = (TextView) findViewById(R.id.tv); 
         Typeface face=Typeface.createFromAsset(getAssets(),"BFantezy.ttf");     
         tv.setTypeface(face);
         tv.setText("My Pictures"); 
            } 

      Intent intent = getIntent(); 
      city = intent.getStringExtra("galleryimags"); 

      InfiniteGallery galleryOne = (InfiniteGallery) findViewById(R.id.galleryOne);
      galleryOne.setAdapter(new InfiniteGalleryAdapter(this)); 
      galleryOne.setSelection(galleryOne.getCount()/2);            
                     }
                     }


   class InfiniteGalleryAdapter extends BaseAdapter { 
      private Context mContext;
      public InfiniteGalleryAdapter(Context c, int[] imageIds) { 
      this.mContext = c; } 

       public int getCount() { 
      return Integer.MAX_VALUE; } 

       public Object getItem(int position) { 
      return position; } 

       public long getItemId(int position) { 
      return position; } 

    private LayoutInflater inflater=null; 
    public InfiniteGalleryAdapter(Context a) { 
       this.mContext = a; 
       inflater = (LayoutInflater)mContext.getSystemService (
            Context.LAYOUT_INFLATER_SERVICE); 
       getImagesforCity(); 
        } 

      private int[] images;
      private void getImagesforCity() {
        if(GalleryCity.city.equalsIgnoreCase("City1")){ 
         int[] imagestemp = {
               R.drawable.one_1, R.drawable.one_1, 
                R.drawable.one_1

                  }; 
        images=imagestemp;

                        }
        if(GalleryCity.city.equalsIgnoreCase("City2")){
         int[] imagestemp = {
        R.drawable.one_2, R.drawable.one_2, 
             R.drawable.one_2   }; 
       images=imagestemp;

                                  }

        if(GalleryCity.city.equalsIgnoreCase("City3")){
          int[] imagestemp = {
        R.drawable.one_3, R.drawable.one_3, 
             R.drawable.one_3   }; 
        images=imagestemp;

                       }
        if(GalleryCity.city.equalsIgnoreCase("City4")){
          int[] imagestemp = {
        R.drawable.one_4, R.drawable.one_4, 
             R.drawable.one_4   }; 
        images=imagestemp;

                         }
        if(GalleryCity.city.equalsIgnoreCase("City5")){
            int[] imagestemp = {
        R.drawable.one_5, R.drawable.one_5, 
             R.drawable.one_5   }; 
       images=imagestemp;

                          }
                   }
       public class ViewHolder{ 
      public TextView text; 
      public ImageView image; } 

      private String[] name = { "in the cafe", "im in park", "nice place", };

      public View getView(int position, View convertView, ViewGroup parent) { 
         ImageView i = getImageView(); 

             int itemPos = (position % images.length); 

        try { i.setImageResource(images[itemPos]); ((BitmapDrawable) i.getDrawable 
                     ()).setAntiAlias(true); } 

       catch (OutOfMemoryError e) { Log.e("InfiniteGalleryAdapter", "Out of memory
                    creating imageview. Using empty view.", e); } 

       View vi=convertView; 
       ViewHolder holder; 
    if(convertView==null){ 
     vi = inflater.inflate(R.layout.gallery_items, null); 
      holder=new ViewHolder(); holder.text=(TextView)vi.findViewById
                    (R.id.textView1); 
      holder.image=(ImageView)vi.findViewById(R.id.image); 
         vi.setTag(holder); } 

      else holder=(ViewHolder)vi.getTag(); 
      holder.text.setText(name[itemPos]); 

      final int stub_id=images[itemPos]; 
      holder.image.setImageResource(stub_id); 

         return vi; } 

      private ImageView getImageView() { 

        ImageView i = new ImageView(mContext); 

               return i; } 

                        }
    class InfiniteGallery extends Gallery {

   public InfiniteGallery(Context context) {
    super(context);
      init();
            }

public InfiniteGallery(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
                   }

public InfiniteGallery(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
               }

private void init(){
    setSpacing(25);
    setHorizontalFadingEdgeEnabled(false);
                   }

public void setResourceImages(int[] name){
    setAdapter(new InfiniteGalleryAdapter(getContext(), name));
    setSelection((getCount() / 2));
                  }
                    }

各行クラス（City1、City2、City3など）：

私はこのコードを入れました：

 public void handleClick(View v){


    Intent intent = new Intent(this, GalleryCity.class);
    intent.putExtra("galleryimags",city);
    startActivity(intent);                           

            }

                }

また、クラスごとに異なる画像の文字列名を設定する方法を教えてください：（City1、City2、City3、City4、City5）クラス。

そのような ：

   private String[] name = { "in the cafe", "im in park",
                                 "nice place", };

これはスタックトレースです：

 04-20 18:29:17.421: E/AndroidRuntime(5007): FATAL EXCEPTION: main
 04-20 18:29:17.421: E/AndroidRuntime(5007): java.lang.RuntimeException: Unable to
 start activity ComponentInfo{com.test.city/com.test.city.GalleryCity}:
 java.lang.NullPointerException
 04-20 18:29:17.421: E/AndroidRuntime(5007):
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
 04-20 18:29:17.421: E/AndroidRuntime(5007):
 at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at android.app.ActivityThread.access$1500(ActivityThread.java:117)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
 04-20 18:29:17.421: E/AndroidRuntime(5007):
 at android.os.Handler.dispatchMessage(Handler.java:99)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at android.os.Looper.loop(Looper.java:123)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at android.app.ActivityThread.main(ActivityThread.java:3687)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at java.lang.reflect.Method.invokeNative(Native Method)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at java.lang.reflect.Method.invoke(Method.java:507)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at dalvik.system.NativeStart.main(Native Method)
 04-20 18:29:17.421: E/AndroidRuntime(5007):
 Caused by: java.lang.NullPointerException
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at com.test.city.InfiniteGalleryAdapter.getImagesforCity(GalleryCity.java:71)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at com.test.city.InfiniteGalleryAdapter.<init>(GalleryCity.java:66)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at com.test.city.GalleryCity.onCreate(GalleryCity.java:43)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
 at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
 04-20 18:29:17.421: E/AndroidRuntime(5007): 
    ... 11 more

更新：次のようにGallerCityに変更を適用します：

  public class GalleryCity extends Activity {
 static String city;

    /** Called when the activity is first created. */
   @Override
      public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

    Boolean customTitleSupported = requestWindowFeature(Window.FEATURE_CUSTOM_TITLE); 
    // Set the layout to use
    setContentView(R.layout.main);
    if (customTitleSupported) { 
 getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,R.layout.custom_title); 
         TextView tv = (TextView) findViewById(R.id.tv); 
     Typeface face=Typeface.createFromAsset(getAssets(),"BFantezy.ttf");     
         tv.setTypeface(face);
         tv.setText("My Pictures"); 
            } 

    Intent intent = getIntent(); 
    city = intent.getStringExtra("galleryimags"); 

    InfiniteGallery galleryOne = (InfiniteGallery) findViewById(R.id.galleryOne);

    galleryOne.setAdapter(new InfiniteGalleryAdapter(this,intent.getStringExtra
                          ("galleryimags"))); 
    galleryOne.setSelection(galleryOne.getCount()/2);            
     }
      }

  class InfiniteGalleryAdapter extends BaseAdapter { 
  private Context mContext;

   String city ="";  
  public InfiniteGalleryAdapter(Context c, String city) {  
     this.mContext = c;     
     this.city=city;       }  


   public int getCount() { 
return Integer.MAX_VALUE; } 

   public Object getItem(int position) { 
return position; } 

   public long getItemId(int position) { 
return position; } 

   private LayoutInflater inflater=null; 
   public InfiniteGalleryAdapter(Context a) { 
  this.mContext = a; 
     inflater = (LayoutInflater)mContext.getSystemService
             (Context.LAYOUT_INFLATER_SERVICE);                        
       getImagesforCity(); 
           } 

      private int[] images;


   private void getImagesforCity() {
  if(city.equalsIgnoreCase("City1")){  
    int[] imagestemp = {
            R.drawable.one_1, R.drawable.one_1, 
            R.drawable.one_1

    }; 
    images=imagestemp;

            }
 if(city.equalsIgnoreCase("City2")){  
    int[] imagestemp = {
            R.drawable.one_2, R.drawable.one_2, 
            R.drawable.one_2   }; 
    images=imagestemp;

            }

 if(city.equalsIgnoreCase("City3")){  
    int[] imagestemp = {
            R.drawable.one_3, R.drawable.one_3, 
            R.drawable.one_3   }; 
    images=imagestemp;

            }
 if(city.equalsIgnoreCase("City4")){  
    int[] imagestemp = {
            R.drawable.one_4, R.drawable.one_4, 
            R.drawable.one_4   }; 
    images=imagestemp;

            }
 if(city.equalsIgnoreCase("City5")){  
    int[] imagestemp = {
            R.drawable.one_5, R.drawable.one_5, 
            R.drawable.one_5   }; 
    images=imagestemp;

          }
        }
 public class ViewHolder{ 
 public TextView text; 
 public ImageView image; } 

   private String[] name = { "in the cafe", "im in park", "nice place", };

   public View getView(int position, View convertView, ViewGroup parent) { 
      ImageView i = getImageView(); 

   int itemPos = (position % images.length); 

   try { i.setImageResource(images[itemPos]); ((BitmapDrawable) i.getDrawable
                   ()).setAntiAlias(true); } 

  catch (OutOfMemoryError e) { Log.e("InfiniteGalleryAdapter", "Out of memory
              creating imageview. Using empty view.", e); } 

     View vi=convertView; 
     ViewHolder holder; 
   if(convertView==null){ 
 vi = inflater.inflate(R.layout.gallery_items, null); 
 holder=new ViewHolder(); holder.text=(TextView)vi.findViewById(R.id.textView1); 
 holder.image=(ImageView)vi.findViewById(R.id.image); 
 vi.setTag(holder); } 

      else holder=(ViewHolder)vi.getTag(); 
      holder.text.setText(name[itemPos]); 

      final int stub_id=images[itemPos]; 
      holder.image.setImageResource(stub_id); 

        return vi; } 

    private ImageView getImageView() { 

     ImageView i = new ImageView(mContext); 

      return i; } 

            }
    class InfiniteGallery extends Gallery {

  public InfiniteGallery(Context context) {
    super(context);
    init();
           }

public InfiniteGallery(Context context, AttributeSet attrs) {
    super(context, attrs);
    init();
                 }

public InfiniteGallery(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    init();
              }

private void init(){
    setSpacing(25);
    setHorizontalFadingEdgeEnabled(false);
              }
public void setResourceImages(String name){
    setAdapter(new InfiniteGalleryAdapter(getContext(), name));
    setSelection((getCount() / 2));
                }
            }

変更を適用した後の最初のことは、この部分で赤い線のエラーがありました：

  public void setResourceImages(int[] name){
    setAdapter(new InfiniteGalleryAdapter(getContext(), name));
    setSelection((getCount() / 2));
          }
          }
  red mark under :
     setAdapter(new InfiniteGalleryAdapter(getContext(), name));

次に、これに変更しました（したがって、赤い線のエラーは表示されません）：

    public void setResourceImages(String name){
    setAdapter(new InfiniteGalleryAdapter(getContext(), name));
    setSelection((getCount() / 2));
 }
     }

アプリを実行した後、ギャラリーを開くボタンをクリックすると強制的に閉じます。

次のlogcatログは次のとおりです。

  04-21 23:31:32.394: E/AndroidRuntime(27795): FATAL EXCEPTION: main
  04-21 23:31:32.394: E/AndroidRuntime(27795): java.lang.NullPointerException
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
    at com.test.city.InfiniteGalleryAdapter.getView(GalleryCity.java:126)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
    at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:192)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.View.measure(View.java:8366)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.widget.LinearLayout.measureVertical(LinearLayout.java:386)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.View.measure(View.java:8366)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.View.measure(View.java:8366)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.View.measure(View.java:8366)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.View.measure(View.java:8366)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.ViewRoot.performTraversals(ViewRoot.java:844)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.view.ViewRoot.handleMessage(ViewRoot.java:1865)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.os.Handler.dispatchMessage(Handler.java:99)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.os.Looper.loop(Looper.java:123)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at android.app.ActivityThread.main(ActivityThread.java:3687)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at java.lang.reflect.Method.invokeNative(Native Method)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at java.lang.reflect.Method.invoke(Method.java:507)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
  04-21 23:31:32.394: E/AndroidRuntime(27795): 
   at dalvik.system.NativeStart.main(Native Method)

この行のlogcatのエラー：

   04-21 23:31:32.394: E/AndroidRuntime(27795): 
     at com.test.city.InfiniteGalleryAdapter.getView(GalleryCity.java:126)

コードブロックのこの行に一致するもの：

     int itemPos = (position % images.length);
4

3 に答える 3

0

更新：CityGalleryクラスに対して次のコードを試してください。

InfiniteGallery galleryOne = (InfiniteGallery) findViewById(R.id.galleryOne);
        galleryOne.setAdapter(initializeImages()); 
        galleryOne.setSelection(galleryOne.getCount()/2);            





    }

    private InfiniteGalleryAdapter initializeImages() {
        InfiniteGalleryAdapter galleryAdapter = null;

        String city = getIntent().getStringExtra("cityname");
        tv.setText("My "+city+" Pictures"); 

        if(city.equalsIgnoreCase("City1")){
            int[] tempimages = { R.drawable.ic_launcher, R.drawable.ic_launcher,R.drawable.ic_launcher };  
            String[] name = { "Image 1","Image 2", "Image 3"};  

            galleryAdapter=new InfiniteGalleryAdapter(this, tempimages, name);
        }else if(city.equalsIgnoreCase("City2")){
            int[] tempimages = { R.drawable.ic_launcher, R.drawable.ic_launcher,R.drawable.ic_launcher };  
            String[] name = { "Image 4","Image 5", "Image 6"};  

            galleryAdapter=new InfiniteGalleryAdapter(this, tempimages, name);


        }else if(city.equalsIgnoreCase("City3")){
            int[] tempimages = { R.drawable.ic_launcher, R.drawable.ic_launcher,R.drawable.ic_launcher };  
            String[] name = { "Image 7","Image 8", "Image 9"};  

            galleryAdapter=new InfiniteGalleryAdapter(this, tempimages, name);

        }else if(city.equalsIgnoreCase("City4")){
            int[] tempimages = { R.drawable.ic_launcher, R.drawable.ic_launcher,R.drawable.ic_launcher };  
            String[] name = { "Image 10","Image 11", "Image 12"};  

            galleryAdapter=new InfiniteGalleryAdapter(this, tempimages, name);

        }else if(city.equalsIgnoreCase("City5")){
            int[] tempimages = { R.drawable.ic_launcher, R.drawable.ic_launcher,R.drawable.ic_launcher };  
            String[] name = { "Image 13","Image 14", "Image 15"};  

            galleryAdapter=new InfiniteGalleryAdapter(this, tempimages, name);
        }
        return galleryAdapter;





    }

}

于 2012-04-20T18:29:23.647 に答える
0

次のようなことを試しましたか 

Intent myIntent = new Intent();
myIntent.putExtra("key", "value");
startActivity(myIntent);
于 2012-04-20T00:28:50.253 に答える