Android onTouch事件仅被称为第一次

Question

我有Android应用程序的图库查看器。

我需要首先显示一张大图片，然后在其下方显示其他图片的缩略图。 5秒后，缩略图消失，当用户触摸屏幕时，缩略图应该再次出现。

这里的问题是，如果缩略图再次出现，它们不会再消失，因此这只能在第一次使用。

我该如何解决这个问题？

这是我的布局代码：

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_gravity="center_horizontal" 
    android:gravity="center_horizontal" 
    android:orientation="horizontal" > 

    <ImageView 
     android:id="@+id/GalleryImage" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_gravity="center_horizontal" > 
    </ImageView> 

    <Gallery 
     android:id="@+id/GalleryThumbnails" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/GalleryImage" /> 
</RelativeLayout> 

这是我实现：

public class GalleryView extends Activity { 
    Integer[] pics = { R.drawable.antartica1, R.drawable.antartica2, R.drawable.antartica3, R.drawable.antartica4, R.drawable.antartica5, R.drawable.antartica6, R.drawable.antartica7, 
      R.drawable.antartica8, R.drawable.antartica9, R.drawable.antartica10 }; 
    ImageView imageView; 

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

     final Gallery ga = (Gallery) findViewById(R.id.GalleryThumbnails); 
     ga.setAdapter(new ImageAdapter(this)); 

     imageView = (ImageView) findViewById(R.id.GalleryImage); 

     // We show the first image when creating the view gallery 

     imageView.setScaleType(ImageView.ScaleType.CENTER); 
     imageView.setImageResource(pics[0]); 

     // Hiding the thumbnails after 5 seconds 

     final View v = new View(this); 
     v.postDelayed(new Runnable() { 
      public void run() { 
       ga.setVisibility(View.GONE); 
      } 
     }, (long) 5000); 

     // Showing the thumbnails again when touching the screen 
     // TODO: Not working yet 

     imageView.setOnTouchListener(new OnTouchListener() { 
      public boolean onTouch(View v, MotionEvent event) { 
       if (event.getAction() == MotionEvent.ACTION_DOWN) { 
        ga.setVisibility(View.VISIBLE); 
       } 
       return false; 
      } 
     }); 

     ga.setOnItemClickListener(new OnItemClickListener() { 
      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 
       imageView.setScaleType(ImageView.ScaleType.CENTER); 
       imageView.setImageResource(pics[arg2]); 
      } 
     }); 
    } 

    public class ImageAdapter extends BaseAdapter { 

     private Context ctx; 
     int imageBackground; 

     public ImageAdapter(Context c) { 
      ctx = c; 
      TypedArray ta = obtainStyledAttributes(R.styleable.Gallery1); 
      imageBackground = ta.getResourceId(R.styleable.Gallery1_android_galleryItemBackground, 1); 
      ta.recycle(); 
     } 

     public int getCount() { 

      return pics.length; 
     } 

     public Object getItem(int arg0) { 
      return arg0; 
     } 

     public long getItemId(int arg0) { 
      return arg0; 
     } 

     // Thumbnails gallery 

     public View getView(int arg0, View arg1, ViewGroup arg2) { 
      ImageView iv = new ImageView(ctx); 
      iv.setImageResource(pics[arg0]); 
      iv.setScaleType(ImageView.ScaleType.FIT_XY); 
      iv.setLayoutParams(new Gallery.LayoutParams(200, 120)); 
      iv.setBackgroundResource(imageBackground); 
      return iv; 
     } 
    } 
} 

非常感谢提前！

Answer 1

这是奇怪的代码

final View v = new View(this); 
    v.postDelayed(new Runnable() { 
     public void run() { 
      ga.setVisibility(View.GONE); 
     } 
    }, (long) 5000); 

您正在创建一个悬空查看以便安排延迟呼叫到ga。

我猜你的意思

private Gallery ga; // make ga to a member 

private void scheduleHide() 
{ 
    ga.postDelayed(new Runnable() { 
     public void run() { 
      ga.setVisibility(View.GONE); 
     } 
    }, (long) 5000); 
} 

public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.gallery_view_layout); 

    ga = (Gallery) findViewById(R.id.GalleryThumbnails); 
... 
    scheduleHide(); 
... 
    imageView.setOnTouchListener(new OnTouchListener() { 
     public boolean onTouch(View v, MotionEvent event) { 
      if (event.getAction() == MotionEvent.ACTION_DOWN) { 
       ga.setVisibility(View.VISIBLE); 
       scheduleHide(); 
      } 
      return false; 
     } 
    }); 
... 

Answer 2

了自己：只包括在setOnItemClickListener再次调用定时器：

ga.setOnItemClickListener(new OnItemClickListener() { 
      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 
       final View v = new View(getApplicationContext()); 
       v.postDelayed(new Runnable() { 
        public void run() { 
         ga.setVisibility(View.GONE); 
        } 
       }, (long) 5000); 
       imageView.setScaleType(ImageView.ScaleType.CENTER); 
       imageView.setImageResource(pics[arg2]); 
      } 
     }); 

这是所有乡亲:)