事件分发和滑动冲突_clickableviewaccessibility-优快云博客

此博客是关于Android开发的入门内容。参考《Android开发艺术探索》及相关博客，自定义了一个ImageView，通过重写onTouchEvent方法，根据滑动角度拉起页面，回调拉起一个activity，调用时需添加setClickable，后续还需深入操作。

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这一块内容暂时只是入门了解，后续还需要深入多操作。

参考书籍：Android开发艺术探索

参考博客：https://blog.youkuaiyun.com/carson_ho/article/details/54136311?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522160525578419724839237114%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fblog.%2522%257D&request_id=160525578419724839237114&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~blog~first_rank_v1~rank_blog_v1-1-54136311.pc_v1_rank_blog_v1&utm_term=%E4%BA%8B%E4%BB%B6%E5%88%86%E5%8F%91&spm=1018.2118.3001.4450

此处是自定义的一个ImageView，主要就是通过重写onTouchEvent方法，判断滑动角度来拉起页面。（回调就是拉起一个activity）

package com.example.androidpratic.customview;

import android.annotation.SuppressLint;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.ImageView;

import androidx.annotation.Nullable;

import com.example.androidpratic.fragment.ScreenSlidePageFragment;

@SuppressLint("AppCompatCustomView")
public class MyImageView extends ImageView {
    private static final String TAG = "MyImageView";
    private float mLastX;
    private float mLastY;
    private ScreenSlidePageFragment.ScrollCallBack mScrollCallBack;
    private boolean mOpenFlag = false;
    private float mYDistance;

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

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

    public MyImageView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public void setScrollCallBack(ScreenSlidePageFragment.ScrollCallBack callBack) {
        mScrollCallBack = callBack;
    }

    @SuppressLint("ClickableViewAccessibility")
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int x = (int) event.getX();
        int y = (int) event.getY();
        Log.d(TAG, "onTouchEvent......." + x + "," + y);
        if(x < getRight() - getLeft() && y < getBottom() - getTop()) {
            switch (event.getAction() & event.getActionMasked()) {
                case MotionEvent.ACTION_DOWN:
                    Log.d(TAG, "onTouchEvent down............");
                    break;
                case MotionEvent.ACTION_MOVE:
                    mYDistance = mLastY - y;
                    double tan = Math.atan2(Math.abs(mYDistance), Math.abs(mLastX - x));
                    double arg = 180 * tan / Math.PI;
                    Log.d(TAG, "onTouchEvent move............" + arg + "," + mYDistance);
                    if (arg > 45 && mYDistance > 0) {
                        getParent().requestDisallowInterceptTouchEvent(true);
                        mOpenFlag = true;
                    } else {
                        getParent().requestDisallowInterceptTouchEvent(false);
                    }
                    break;
                case MotionEvent.ACTION_UP:
                    Log.d(TAG, "onTouchEvent up............");
                    if (mOpenFlag) {
                        mScrollCallBack.openWeb();
                        mOpenFlag = false;
                    }
                    break;
                default:
                    break;
            }
        }
        mLastX = event.getX();
        mLastY = event.getY();

        return super.onTouchEvent(event);
    }
}

调用主要就是这样，setClickable必须加，不然没响应。

mImageView = inflateView.findViewById(R.id.slide_page);
mImageView.setScrollCallBack(mScrollCallBack);
mImageView.setClickable(true);