GridView的onTouchListener不工作，因爲我期望

Question

請幫助我的問題：

我有一個gridview和touchListener的元素。問題是當我觸摸一個元素，我想改變它的背景，當觸摸完成（Action up或ouside）來顯示初始背景。問題是當我點擊一個元素然後拖動我的手指在另一個元素上，最初的元素改變它的背景，但是當我將手指拖到另一個元素上並完成觸摸後，第一個觸摸元素的背景不會改變爲最初的背景。這個想法是，當我從gridview中觸摸一個elemnt來獲得他的鎖。這是5月代碼：

package com.mines.gui.components; 

import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.drawable.BitmapDrawable; 
import android.util.Log; 
import android.view.MotionEvent; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.BaseAdapter; 
import android.widget.GridView; 
import android.widget.ImageView; 

import com.mines.globals.GlobalVariables; 

public class MinesView extends GridView { 

    private int[] length = new int[81]; 
    private final Bitmap grid0 = Bitmap.createBitmap(GlobalVariables.icons, 0, 88, 50, 50); 
    private final Bitmap grid1 = Bitmap.createBitmap(GlobalVariables.icons, 50, 88, 50, 50); 
    private int id; 

    public MinesView(Context context) { 
     super(context); 

     setAdapter(new MineAdapter(context)); 
     setStretchMode(GridView.NO_STRETCH); 
     setNumColumns(9); 
     setHorizontalSpacing(40); 
    } 

    class MineAdapter extends BaseAdapter { 

     private Context context; 

     public MineAdapter(Context context) { 
      this.context = context; 
     } 

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

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

     public int getCount() { 
      return length.length; 
     } 

     public View getView(int position, View convertView, ViewGroup parent) { 
      final ImageView imageView; 

      if(convertView == null) { 
       imageView = new ImageView(context); 
       imageView.setLayoutParams(new GridView.LayoutParams(40, 40)); 
       imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
      } else { 
       imageView = (ImageView) convertView; 
      } 
      imageView.setBackgroundDrawable(new BitmapDrawable(grid0)); 
      imageView.setId(position); 

      imageView.setOnTouchListener(new OnTouchListener() { 
       public boolean onTouch(View arg0, MotionEvent arg1) { 

        switch (arg1.getAction() & MotionEvent.ACTION_MASK) { 
         case MotionEvent.ACTION_DOWN: 
         case MotionEvent.ACTION_POINTER_DOWN: 
          imageView.setBackgroundDrawable(new BitmapDrawable(grid1)); 
         break; 
         case MotionEvent.ACTION_OUTSIDE: 
         case MotionEvent.ACTION_UP: 
         case MotionEvent.ACTION_POINTER_UP: 
          imageView.setBackgroundDrawable(new BitmapDrawable(grid0)); 
         break; 
        } 
        return false; 
       } 
      }); 

      imageView.setOnClickListener(new OnClickListener() { 

       public void onClick(View arg0) { 
        // TODO Auto-generated method stub 

       } 
      }); 

      return imageView; 
     } 

    } 

} 

Answer 1

嘗試這個代碼... 創建ontouchlistener的GridView控件。

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

     GridView gridview = (GridView) findViewById(R.id.gridview); 
     gridview.setAdapter(new ImageAdapter(this)); 

} 

public class ImageAdapter extends BaseAdapter { 
    private Context mContext; 

    public ImageAdapter(Context c) { 
     mContext = c; 
    } 

    public int getCount() { 
     return mThumbIds.length; 
    } 

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

    public long getItemId(int position) { 
     return 0; 
    } 

    // create a new ImageView for each item referenced by the Adapter 
    public View getView(int position, View convertView, ViewGroup parent) { 
     ImageView imageView; 
     if (convertView == null) { // if it's not recycled, initialize some attributes 
      imageView = new ImageView(mContext); 
      imageView.setLayoutParams(new GridView.LayoutParams(85, 85)); 
      imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); 
      imageView.setPadding(8, 8, 8, 8); 
     } else { 
      imageView = (ImageView) convertView; 
     } 

     imageView.setImageResource(mThumbIds[position]); 
     imageView.setOnTouchListener(new OnTouchListener() { 

      @Override 
      public boolean onTouch(View v, MotionEvent event) { 
       // TODO Auto-generated method stub 

       if(event.getAction() == MotionEvent.ACTION_DOWN) 
       { 
        v.setBackgroundResource(R.drawable.sample_0); 
        Log.v("log_tag", "MotionEvent.ACTION_DOWN"); 
        return true; 
       } 
       else if(event.getAction()==MotionEvent.ACTION_UP) 
       { 

        v.setBackgroundDrawable(null); 
        Log.v("log_tag", "MotionEvent.ACTION_UP"); 
        return true; 
       } 
       return false; 
      } 
     }); 
     return imageView; 
    } 

    // references to our images 
    private Integer[] mThumbIds = { 
      R.drawable.sample_2, R.drawable.sample_3, 
      R.drawable.sample_4, R.drawable.sample_5, 
      R.drawable.sample_6, R.drawable.sample_7, 
      R.drawable.sample_0, R.drawable.sample_1, 
      R.drawable.sample_2, R.drawable.sample_3, 
      R.drawable.sample_4, R.drawable.sample_5, 
      R.drawable.sample_6, R.drawable.sample_7, 
      R.drawable.sample_0, R.drawable.sample_1, 
      R.drawable.sample_2, R.drawable.sample_3, 
      R.drawable.sample_4, R.drawable.sample_5, 
      R.drawable.sample_6, R.drawable.sample_7 
    }; 
}