我是安卓新手。当前代码可以将多个图像视图拖放到单个 ImageView 上，但我无法将它们拖放到多个图像视图上。请帮助我如何修改我的代码或任何其他现有代码。
MainActivity.java
package n.f.letters;
import android.app.Activity;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.RelativeLayout;
public class MainActivity extends Activity implements OnTouchListener {
/** Called when the activity is first created. */
private View selected_item = null;
private int offset_x = 0;
private int offset_y = 0;
Boolean touchFlag=false;
boolean dropFlag=false;
LayoutParams imageParams;
ImageView imageDrop,image1,image2,image3,image4;
int crashX,crashY;
Drawable dropDrawable,selectDrawable;
Rect dropRect,selectRect;
int topy,leftX,rightX,bottomY;
int dropArray[];
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
ViewGroup container = (ViewGroup) findViewById(R.id.container);
imageDrop=(ImageView) findViewById(R.id.ImgDrop);
image1=(ImageView) findViewById(R.id.img1);
image2=(ImageView) findViewById(R.id.img2);
image3=(ImageView) findViewById(R.id.img3);
image4=(ImageView) findViewById(R.id.img4);
container.setOnTouchListener(new View.OnTouchListener()
{
public boolean onTouch(View v, MotionEvent event)
{
if(touchFlag==true)
{
switch (event.getActionMasked())
{
case MotionEvent.ACTION_DOWN :
topy=imageDrop.getTop();
leftX=imageDrop.getLeft();
rightX=imageDrop.getRight();
bottomY=imageDrop.getBottom();
//opRect.
break;
case MotionEvent.ACTION_MOVE:
crashX=(int) event.getX();
crashY=(int) event.getY();
int x = (int) event.getX() - offset_x;
int y = (int) event.getY()- offset_y;
int w = getWindowManager().getDefaultDisplay().getWidth() - 50;
int h = getWindowManager().getDefaultDisplay().getHeight() - 10;
if (x > w)
x = w;
if (y > h)
y = h;
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(new ViewGroup.MarginLayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT));
lp.setMargins(x, y, 0, 0);
//Drop Image Here
if(crashX > leftX && crashX < rightX && crashY > topy && crashY < bottomY )
{
Drawable temp=selected_item.getBackground();
imageDrop.setBackgroundDrawable(temp);
imageDrop.bringToFront();
dropFlag=true;
selected_item.setVisibility(View.INVISIBLE);
}
//Drop Image Here
selected_item.setLayoutParams(lp);
break;
case MotionEvent.ACTION_UP:
//
touchFlag=false;
if(dropFlag==true)
{
dropFlag=false;
}
else
{
selected_item.setLayoutParams(imageParams);
}
break;
default:
break;
}
}else
{
System.err.println("Display Else Part ::->"+touchFlag);
}
return true;
}
});
image1.setOnTouchListener(this);
image2.setOnTouchListener(this);
image3.setOnTouchListener(this);
image4.setOnTouchListener(this);
}
public boolean onTouch(View v, MotionEvent event)
{
switch (event.getActionMasked())
{
case MotionEvent.ACTION_DOWN:
touchFlag=true;
offset_x = (int) event.getX();
offset_y = (int) event.getY();
selected_item = v;
imageParams=v.getLayoutParams();
break;
case MotionEvent.ACTION_UP:
selected_item=null;
touchFlag=false;
break;
default:
break;
}
return false;
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/container"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ImageView
android:id="@+id/ImgDrop"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:background="#FFF123" />
<ImageView
android:id="@+id/img4"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="75dp"
android:layout_marginTop="61dp"
android:background="@drawable/ic_launcher" />
<ImageView
android:id="@+id/img3"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_alignTop="@+id/img4"
android:layout_toRightOf="@+id/ImgDrop"
android:background="@drawable/ic_launcher" />
<ImageView
android:id="@+id/img2"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_alignRight="@+id/ImgDrop"
android:layout_alignTop="@+id/img3"
android:layout_marginRight="23dp"
android:background="@drawable/ic_launcher" />
<ImageView
android:id="@+id/img1"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_alignTop="@+id/img2"
android:layout_marginRight="40dp"
android:layout_toLeftOf="@+id/img2"
android:background="@drawable/ic_launcher" />