拖动imageview来互换俩个图片

来源：互联网发布：ih5 知乎编辑：程序博客网时间：2024/04/28 19:57

直接上代码：

package xutao.myapplication;import android.content.ClipData;import android.graphics.drawable.Drawable;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.DragEvent;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.WindowManager;import android.widget.ImageView;import android.widget.LinearLayout;public class MainActivity extends AppCompatActivity {    private ImageView mIv1;    private LinearLayout mLl1;    private ImageView mIv2;    private LinearLayout mLl2;    private Drawable normalShape;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        getWindow().setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON,                WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);        normalShape = getResources().getDrawable(R.drawable.shape);        initView();        initEvent();    }    private void initEvent() {        mIv1.setOnTouchListener(MyTouchEvent);        mIv2.setOnTouchListener(MyTouchEvent);        mLl1.setOnDragListener(MyDragListener);        mLl2.setOnDragListener(MyDragListener);    }    private void initView() {        mIv1 = (ImageView) findViewById(R.id.iv1);        mLl1 = (LinearLayout) findViewById(R.id.ll1);        mIv2 = (ImageView) findViewById(R.id.iv2);        mLl2 = (LinearLayout) findViewById(R.id.ll2);    }    View.OnTouchListener MyTouchEvent = new View.OnTouchListener()    {        @Override        public boolean onTouch(View v, MotionEvent event) {            if (event.getAction() == MotionEvent.ACTION_DOWN) {                ClipData data = ClipData.newPlainText("", "");                View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(v);                v.startDrag(data, shadowBuilder, v, 0);                v.setAlpha((float) 0.5);                return true;            } else {                return false;            }        }    };    View.OnDragListener MyDragListener=new View.OnDragListener() {        @Override        public boolean onDrag(View v, DragEvent event) {            View visitorView = (View) event.getLocalState();            ViewGroup visitorOwner = (ViewGroup) visitorView.getParent();            ViewGroup visitedOwner = (ViewGroup) v;            View visitedImage = (View)visitedOwner.getChildAt(0);            switch (event.getAction()) {                case DragEvent.ACTION_DRAG_STARTED:                    break;                case DragEvent.ACTION_DRAG_ENTERED:                    v.setAlpha((float)0.7);                    v.setScaleX(0.7f);                    v.setScaleY(0.7f);                    v.setBackground(normalShape);                    break;                case DragEvent.ACTION_DRAG_EXITED:                    v.setAlpha((float)1.0);                    v.setScaleX(1);                    v.setScaleY(1);                    v.setBackground(normalShape);                    break;                case DragEvent.ACTION_DROP:                    visitorView.setAlpha((float)1.0);                    visitedImage.setAlpha((float)1.0);                    if (visitorOwner != visitedOwner) {           /*            * swap the imageviews from the containers            */                        visitedOwner.removeView(visitedImage);                        visitorOwner.removeView(visitorView);                        visitorOwner.addView(visitedImage);                        LinearLayout container = (LinearLayout) v;                        container.addView(visitorView);                    } else {                    }                    break;                case DragEvent.ACTION_DRAG_ENDED:                    v.setBackgroundDrawable(normalShape);                    v.setAlpha((float)1.0);                    visitedImage.setAlpha((float)1.0);                default:                    break;            }            return true;        }    };}

layout.XML

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="xutao.myapplication.MainActivity">        <LinearLayout        android:id="@+id/ll1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="vertical">        <ImageView        android:id="@+id/iv1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@mipmap/ic_launcher"       />    </LinearLayout>    <LinearLayout        android:id="@+id/ll2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="vertical"        android:layout_marginTop="100dp">        <ImageView            android:id="@+id/iv2"            android:layout_width="50dp"            android:layout_height="50dp"            android:scaleType="centerCrop"            android:src="@drawable/logo"            />    </LinearLayout></LinearLayout>

demo下载链接：http://download.csdn.net/download/xutaojxx/10036214

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