android 自定义悬浮移动View

• 一、自定义悬浮移动View效果图
• 二、使用步骤
• • 1.自定义SuspendRedBagView
  • 2.使用SuspendRedBagView

代码如下（示例）：

package com.walking.go2.widget;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;


public class SuspendRedBagView extends View {
    //父view的坐标位置
    private int leftX;
    private int rightX;
    private int topY;
    private int bottomY;
    //移动的坐标位置
    private int removeLeftX;
    private int removeRightX;
    private int removeTopY;
    private int removeBottomY;
    //true向右移动，false向左移动
    private boolean horizontal = true;
    //true向下移动，false向上移动
    private boolean vertical = true;
    //自定义矩形
    private Rect rect;
    //移动速度
    private int moveSpeed = 3;
    //矩形宽度
    private int mWide = 140;
    //矩形高度
    private int mHeight = 160;
    //矩形背景图片Bitmap
    private Bitmap bitmap;
    //矩形背景图片id
    private int resourceId;
    //是否悬浮移动
    private boolean isSuspend = false;

    public void setMoveSpeed(int moveSpeed) {
        this.moveSpeed = moveSpeed;
    }

    public void setmWide(int mWide) {
        this.mWide = mWide;
    }

    public void setmHeight(int mHeight) {
        this.mHeight = mHeight;
    }

    public void setResourceId(int resourceId) {
        this.resourceId = resourceId;
    }

    public void setSuspend(boolean suspend) {
        isSuspend = suspend;
    }

    public SuspendRedBagView(Context context) {
        super(context);
    }

    public SuspendRedBagView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        leftX = left;
        rightX = right;
        topY = top;
        bottomY = bottom;

        removeLeftX = (right / 2) - (mWide / 2);
        removeRightX = (right / 2) + (mWide / 2);
        removeTopY = 0;
        removeBottomY = mHeight;

        bitmap = BitmapFactory.decodeResource(getResources(), resourceId);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (isSuspend) {
            if (rect == null) {
                rect = new Rect();
            }

            rect.set(removeLeftX, removeTopY, removeRightX, removeBottomY);
            canvas.drawBitmap(bitmap, null, rect, null);

            if (removeLeftX <= leftX) {
                horizontal = true;
            } else if (removeRightX >= rightX) {
                horizontal = false;
            }
            changeX(horizontal);

            if (removeTopY <= topY) {
                vertical = true;
            } else if (removeBottomY >= bottomY) {
                vertical = false;
            }
            changeY(vertical);

            invalidate();
        }
    }

    private void changeX(boolean horizontal) {
        if (horizontal) {
            removeLeftX = removeLeftX + moveSpeed;
            removeRightX = removeRightX + moveSpeed;
        } else {
            removeLeftX = removeLeftX - moveSpeed;
            removeRightX = removeRightX - moveSpeed;
        }
    }

    private void changeY(boolean vertical) {
        if (vertical) {
            removeTopY = removeTopY + moveSpeed;
            removeBottomY = removeBottomY + moveSpeed;
        } else {
            removeTopY = removeTopY - moveSpeed;
            removeBottomY = removeBottomY - moveSpeed;
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            if (rect != null) {
                if (rect.contains((int) event.getX(), (int) event.getY())) {
                    if (onRedBagClickListener != null) {
                        onRedBagClickListener.onRedBagClick();
                        return true;
                    }
                }
            }
        }
        return false;
    }

    private onRedBagClickListener onRedBagClickListener;

    public void setOnRedBagClickListener(SuspendRedBagView.onRedBagClickListener onRedBagClickListener) {
        this.onRedBagClickListener = onRedBagClickListener;
    }

    public interface onRedBagClickListener {
        void onRedBagClick();
    }
}

代码如下（示例）：

		//设置宽度
        suspendRedBagView.setmWide(140);
        //设置高度
        suspendRedBagView.setmHeight(160);
        //设置显示悬浮移动
        suspendRedBagView.setSuspend(true);
        //设置移动速度
        suspendRedBagView.setMoveSpeed(3);
        //设置背景图片
        suspendRedBagView.setResourceId(R.mipmap.bubble_red_packet);
        //点击事件
        suspendRedBagView.setOnRedBagClickListener(new SuspendRedBagView.onRedBagClickListener() {
            @Override
            public void onRedBagClick() {
                Toast.makeText(MainActivity.this, "点击红包", Toast.LENGTH_SHORT).show();
            }
        });