Android activity内实现可拖拽悬浮控件

Posted 2022-11-09 猫叔聊技术

效果图

实现方式：

//在activity中重写此方法
 @Override
    protected void onPostCreate(@Nullable Bundle savedInstanceState) 
        super.onPostCreate(savedInstanceState);
        //添加一个悬浮
        View root = findViewById(android.R.id.content);
        if (root instanceof FrameLayout) 
            FrameLayout content = (FrameLayout) root;
            ImageView stackView = new ImageView(this);
            stackView.setImageResource(R.drawable.fragmentation_ic_stack);
            FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            params.gravity = Gravity.END;
            int dp18 = SizeUtils.dp2px(18);
            params.topMargin = dp18 * 7;
            params.rightMargin = dp18;
            stackView.setLayoutParams(params);
            content.addView(stackView);

            stackView.setOnTouchListener(new StackViewTouchListener(stackView, dp18 / 4));
            stackView.setOnClickListener(new View.OnClickListener() 
                @Override
                public void onClick(View v) 
                    ToastUtils.showLong("现在是点击的时候哦");
                
            );

        
    

2.自定义触摸事件

package com.xh2015.sdk.sdktest.listener;

import android.view.MotionEvent;
import android.view.View;

/**
 * Author：gary
 * <p/>
 * Email: [e-mail]
 * <p/>
 * description:
 * <p/>
 * Date: 2020-12-02 18:13
 */
public class StackViewTouchListener implements View.OnTouchListener 

    private View stackView;
    private float dx, dy = 0F;
    private float downX, downY = 0F;
    private boolean isClickState;
    private int clickLimitValue;

    public StackViewTouchListener(View stackView, int clickLimitValue) 
        this.stackView = stackView;
        this.clickLimitValue = clickLimitValue;
    

    @Override
    public boolean onTouch(View v, MotionEvent event) 
        float X = event.getRawX();
        float Y = event.getY();

        switch (event.getAction()) 
            case MotionEvent.ACTION_DOWN:
                isClickState = true;
                downX = X;
                downY = Y;
                System.out.println(v.toString());
                System.out.println(stackView.toString());
                dx = stackView.getX() - event.getRawX();
                dy = stackView.getY() - event.getRawY();
                break;
            case MotionEvent.ACTION_MOVE:
                if (Math.abs(X - downX) < clickLimitValue && Math.abs(Y - downY) < clickLimitValue) 
                    isClickState = true;
                 else 
                    isClickState = false;
                    stackView.setX(event.getRawX() + dx);
                    stackView.setY(event.getRawY() + dy);
                
                break;
            case MotionEvent.ACTION_CANCEL:
            case MotionEvent.ACTION_UP:
                if (isClickState) 
                    stackView.performClick();
                
                break;
            default:
                return false;
        
        return true;