複数の画像をアンドロイドでドラッグする方法

Question

キャンバスに1つの画像をドラッグできます。複数の画像をドラッグしたいと思います。 これを行う可能性はありますか？

Answer 1

このコードを使用すると、右に役立つ場合は非常に役立ちます。

package edu.sbcc.cs123.draganddropbasic; 

import android.app.*; 
import android.graphics.*; 
import android.os.*; 
import android.view.*; 
import android.view.View.*; 
import android.widget.*; 

    @SuppressWarnings("deprecation") 
    public class DragAndDropBasicActivity extends Activity implements OnTouchListener { 
private ImageView letterView;      // The  letter that the user drags. 
private ImageView emptyLetterView;    // The letter outline that the user is supposed to drag letterView to. 
private AbsoluteLayout mainLayout; 


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

    mainLayout = (AbsoluteLayout) findViewById(R.id.mainLayout); 
    mainLayout.setOnTouchListener(this); 
    letterView = (ImageView) findViewById(R.id.letterView); 
    letterView.setOnTouchListener(this); 

    emptyLetterView = (ImageView) findViewById(R.id.emptyLetterView); 
} 

private boolean dragging = false; 
private Rect hitRect = new Rect(); 

@Override 
/** 
* NOTE: Had significant problems when I tried to react to ACTION_MOVE on letterView. Kept getting alternating (X,Y) 
* locations of the motion events, which caused the letter to flicker and move back and forth. The only solution I could 
* find was to determine when the user had touched down on the letter, then process moves in the ACTION_MOVE 
* associated with the mainLayout. 
*/ 
public boolean onTouch(View v, MotionEvent event) { 
    boolean eventConsumed = true; 
    int x = (int)event.getX(); 
    int y = (int)event.getY(); 

    int action = event.getAction(); 
    if (action == MotionEvent.ACTION_DOWN) { 
     if (v == letterView) { 
      dragging = true; 
      eventConsumed = false; 
     } 
    } else if (action == MotionEvent.ACTION_UP) { 

     if (dragging) { 
      emptyLetterView.getHitRect(hitRect); 
      if (hitRect.contains(x, y)) 
       setSameAbsoluteLocation(letterView, emptyLetterView); 
     } 
     dragging = false; 
     eventConsumed = false; 

    } else if (action == MotionEvent.ACTION_MOVE) { 
     if (v != letterView) { 
      if (dragging) { 
       setAbsoluteLocationCentered(letterView, x, y); 
      } 
     } 
    } 

    return eventConsumed; 

} 


private void setSameAbsoluteLocation(View v1, View v2) { 
    AbsoluteLayout.LayoutParams alp2 = (AbsoluteLayout.LayoutParams) v2.getLayoutParams(); 
    setAbsoluteLocation(v1, alp2.x, alp2.y); 
} 


private void setAbsoluteLocationCentered(View v, int x, int y) { 
    setAbsoluteLocation(v, x - v.getWidth()/2, y - v.getHeight()/2); 
} 


private void setAbsoluteLocation(View v, int x, int y) { 
    AbsoluteLayout.LayoutParams alp = (AbsoluteLayout.LayoutParams) v.getLayoutParams(); 
    alp.x = x; 
    alp.y = y; 
    v.setLayoutParams(alp); 
} 
    } 

とXMLがある......

<?xml version="1.0" encoding="utf-8"?> 
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:id="@+id/mainLayout"> 

<ImageView 
    android:layout_height="wrap_content" 
    android:layout_width="wrap_content" 
    android:id="@+id/emptyLetterView" 
    android:src="@drawable/r_empty" 
    android:layout_x="200px" 
    android:layout_y="300px"> 

</ImageView> 

<ImageView 
    android:layout_height="wrap_content" 
    android:layout_width="wrap_content" 
    android:id="@+id/letterView" 
    android:src="@drawable/r_filled" > 

</ImageView>