View拖拽 自定义绑定view拖拽的工具类

由于工作需求，需要用到这种处理方法所以我就写了这个

废话不多说先看效果图

接下来就看代码吧 DragDropManager

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.PixelFormat;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 拖拽工具类
 */
public class DragDropManager implements View.OnTouchListener {

    /**
     * View 集合
     */
    private List<View> viewList;

    private static Activity mActivity;
    private static DragDropManager mManager;

    private Map<View, ViewInfo> mViewMap;

    /**
     * 窗口管理器，用于显示条目的快照
     */
    private WindowManager mWindowManager;

    /**
     * 窗口管理的布局参数
     */
    private WindowManager.LayoutParams mWindowLayoutParams;

    /**
     * 悬浮的imageView
     */
    private ImageView mDragPhotoView;
    private Bitmap mDragPhotoBitmap;
    private float moveX;
    private float moveY;

    private IDragDropListener listener;

    public DragDropManager() {
        viewList = new ArrayList<>();
        mViewMap = new HashMap<>();
    }

    public static DragDropManager getInstance(Activity activity) {
        mActivity = activity;
        if (mManager == null) {
            mManager = new DragDropManager();
        }
        return mManager;
    }

    /**
     * 绑定view
     */
    public void bindView(View... views) {
        viewList.clear();
        for (View view : views) {
            view.setOnTouchListener(this);
            if(view instanceof TextView){
                view.setOnClickListener(null);
            }
            viewList.add(view);
        }
    }

    /**
     * 添加view
     *
     * @param views
     */
    public void addView(View... views) {
        for (View view : views) {
            view.setOnTouchListener(this);
            viewList.add(view);
        }
    }

    /**
     * 设置监听事件
     * @param listener
     */
    public void setListener(IDragDropListener listener){
        this.listener = listener;
    }

    @Override
    public boolean onTouch(View view, MotionEvent event) {

        int action = event.getAction();
        switch (action) {
            case MotionEvent.ACTION_DOWN:
                Log.i("tag", "生成图像");
                //首先初始化每个控件的坐标信息
                initViewLayout();
                //判断出点击的是哪个控件 并悬浮出哪个控件
                createDragPhotoView(view);
                moveX = event.getX();
                moveY = event.getY();
                //回调监听
                if(listener != null){
                    listener.startDragDrop(view.getId());
                }
                break;
            case MotionEvent.ACTION_MOVE:
                mWindowLayoutParams.x = (int) (mViewMap.get(view).x + (event.getX() - moveX));
                mWindowLayoutParams.y = (int) (mViewMap.get(view).y + (event.getY() - moveY));
                mWindowManager.updateViewLayout(mDragPhotoView, mWindowLayoutParams);
                Log.i("tag", "移动图像 x:"+(view.getX() + (event.getX() - moveX))+"  y:" + (view.getY() + (event.getY() - moveY)));
                break;
            case MotionEvent.ACTION_UP:
                Log.i("tag", "去掉图像");

                //
                if(listener != null) {
                    for (View tempView : viewList) {
                        if (tempView.getId() != view.getId()) {
                            ViewInfo viewInfo = mViewMap.get(tempView);
                            if (event.getRawX() > viewInfo.x && event.getRawY() > viewInfo.y
                                    && event.getRawX() < (viewInfo.x + viewInfo.width) && event.getRawY() < (viewInfo.y + viewInfo.height)) {
                                listener.endDragDrop(view.getId(),tempView.getId());
                                break;
                            }
                        }
                    }
                }

                // 移除快照
                if (mDragPhotoView != null) {
                    mWindowManager.removeView(mDragPhotoView);
                    mDragPhotoView.setImageDrawable(null);
                    mDragPhotoBitmap.recycle();
                    mDragPhotoBitmap = null;
                    mDragPhotoView = null;
                }
                break;
        }
        return false;
    }

    /**
     * 初始化每个控件的坐标信息
     */
    private void initViewLayout() {
        mViewMap.clear();
        int[] location = new int[2];
        for (View view : viewList) {
            view.getLocationInWindow(location);
            ViewInfo viewInfo = new ViewInfo(view, location[0], location[1], view.getMeasuredHeight(), view.getMeasuredWidth());
            mViewMap.put(view, viewInfo);
        }
    }

    /**
     * 创建拖拽快照
     */
    private void createDragPhotoView(View view) {
        // 进行绘图缓存
        view.setDrawingCacheEnabled(true);
        // 提取缓存中的图片
        mDragPhotoBitmap = Bitmap.createBitmap(view.getDrawingCache());
        // 获取当前窗口管理器
        mWindowManager = (WindowManager) mActivity.getSystemService(Context.WINDOW_SERVICE);
        // 创建布局参数
        mWindowLayoutParams = new WindowManager.LayoutParams();
        mWindowLayoutParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
        mWindowLayoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
        mWindowLayoutParams.gravity = Gravity.TOP | Gravity.START;
        mWindowLayoutParams.format = PixelFormat.TRANSLUCENT; // 期望的图片为半透明效果，但设置其他值并没有看到不一样的效果
        // 下面这些参数能够帮助准确定位到选中项点击位置
        mWindowLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
        mWindowLayoutParams.windowAnimations = 0; // 无动画
        mWindowLayoutParams.alpha = 0.6f; // 微透明

        mWindowLayoutParams.x = (int) mViewMap.get(view).x;
        mWindowLayoutParams.y = (int) mViewMap.get(view).y;
        mDragPhotoView = new ImageView(mActivity);
        mDragPhotoView.setImageBitmap(mDragPhotoBitmap);
        mWindowManager.addView(mDragPhotoView, mWindowLayoutParams);
    }

    /**
     * 监听接口
     */
    public interface IDragDropListener{

        /**
         * 开始拖动
         * @param startViewId 返回当前view的ID
         */
        void startDragDrop(int startViewId);

        /**
         * 结束拖动
         * @param startViewId 返回当前view的ID
         * @param endViewId 返回覆盖在某个view的ID
         */
        void endDragDrop(int startViewId,int endViewId);
    }

    /**
     * 记录当前view的坐标和宽高信息
     */
    class ViewInfo {

        private View view;
        private float x;
        private float y;
        private float height;
        private float width;

        public ViewInfo(View view, float x, float y, float height, float width) {
            this.view = view;
            this.x = x;
            this.y = y;
            this.height = height;
            this.width = width;
        }
    }
}

使用方法

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private DragDropManager dragDropManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TextView textView = findViewById(R.id.tvTitle);
        TextView tegg = findViewById(R.id.tvTitlegg);
        Button btnTuo = findViewById(R.id.btnTuo);
        dragDropManager = DragDropManager.getInstance(this);
        dragDropManager.bindView(textView,btnTuo,tegg);
        dragDropManager.setListener(new DragDropManager.IDragDropListener() {
            @Override
            public void startDragDrop(int startViewId) {
                Toast.makeText(MainActivity.this,"开始悬浮",0).show();
            }

            @Override
            public void endDragDrop(int startViewId, int endViewId) {
                Toast.makeText(MainActivity.this,"开始悬浮 sID:" + startViewId + "//endID : " + endViewId,0).show();
            }
        });

        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(MainActivity.this,"text dianji",0).show();
            }
        });
        btnTuo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(MainActivity.this,"btnTuo dianji",0).show();
            }
        });
    }
}

代码demo
demo下载

原文地址：https://www.cnblogs.com/woaixingxing/p/8986790.html