侧滑实现

找了很多种侧滑的实现，个人觉得这种实现简单，支持的更多，代码也容易看懂，原理一目了然。

package com.gaosi.View;

import java.util.LinkedList;
import java.util.List;

import com.gaosi.teacherapp.R;

import android.app.Activity;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.Scroller;


public class SwipeBackLayout extends FrameLayout {
    private static final String TAG = SwipeBackLayout.class.getSimpleName();
    private View mContentView;
    private int mTouchSlop;
    private int downX;
    private int downY;
    private int tempX;
    private Scroller mScroller;
    private int viewWidth;
    private boolean isSilding;
    private boolean isFinish;
    private Drawable mShadowDrawable;
    private Activity mActivity;
    private List<ViewPager> mViewPagers = new LinkedList<ViewPager>();
    
    public SwipeBackLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public SwipeBackLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
        mScroller = new Scroller(context);

        mShadowDrawable = getResources().getDrawable(R.drawable.shadow_left);
    }
    
    
    public void attachToActivity(Activity activity) {
        mActivity = activity;
        TypedArray a = activity.getTheme().obtainStyledAttributes(
                new int[] { android.R.attr.windowBackground });
        int background = a.getResourceId(0, 0);
        a.recycle();

        ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView();
        ViewGroup decorChild = (ViewGroup) decor.getChildAt(0);
        decorChild.setBackgroundResource(background);
        decor.removeView(decorChild);
        addView(decorChild);
        setContentView(decorChild);
        decor.addView(this);
    }

    private void setContentView(View decorChild) {
        mContentView = (View) decorChild.getParent();
    }

    /**
     * 事件拦截操作
     */
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        //处理ViewPager冲突问题
        ViewPager mViewPager = getTouchViewPager(mViewPagers, ev);
        Log.i(TAG, "mViewPager = " + mViewPager);
        
        if(mViewPager != null && mViewPager.getCurrentItem() != 0){
            return super.onInterceptTouchEvent(ev);
        }

        switch (ev.getAction()) {
        case MotionEvent.ACTION_DOWN:
            downX = tempX = (int) ev.getRawX();
            downY = (int) ev.getRawY();
            break;
        case MotionEvent.ACTION_MOVE:
            int moveX = (int) ev.getRawX();
            // 满足此条件屏蔽SildingFinishLayout里面子类的touch事件
            if (moveX - downX > mTouchSlop
                    && Math.abs((int) ev.getRawY() - downY) < mTouchSlop) {
                return true;
            }
            break;
        }

        return super.onInterceptTouchEvent(ev);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
        case MotionEvent.ACTION_MOVE:
            int moveX = (int) event.getRawX();
            int deltaX = tempX - moveX;
            tempX = moveX;
            if (moveX - downX > mTouchSlop
                    && Math.abs((int) event.getRawY() - downY) < mTouchSlop) {
                isSilding = true;
            }

            if (moveX - downX >= 0 && isSilding) {
                mContentView.scrollBy(deltaX, 0);
            }
            break;
        case MotionEvent.ACTION_UP:
            isSilding = false;
            if (mContentView.getScrollX() <= -viewWidth / 2) {
                isFinish = true;
                scrollRight();
            } else {
                scrollOrigin();
                isFinish = false;
            }
            break;
        }

        return true;
    }
    
    /**
     * 获取SwipeBackLayout里面的ViewPager的集合
     * @param mViewPagers
     * @param parent
     */
    private void getAlLViewPager(List<ViewPager> mViewPagers, ViewGroup parent){
        int childCount = parent.getChildCount();
        for(int i=0; i<childCount; i++){
            View child = parent.getChildAt(i);
            if(child instanceof ViewPager){
                mViewPagers.add((ViewPager)child);
            }else if(child instanceof ViewGroup){
                getAlLViewPager(mViewPagers, (ViewGroup)child);
            }
        }
    }
    
    
    /**
     * 返回我们touch的ViewPager
     * @param mViewPagers
     * @param ev
     * @return
     */
    private ViewPager getTouchViewPager(List<ViewPager> mViewPagers, MotionEvent ev){
        if(mViewPagers == null || mViewPagers.size() == 0){
            return null;
        }
        Rect mRect = new Rect();
        for(ViewPager v : mViewPagers){
            v.getHitRect(mRect);
            
            if(mRect.contains((int)ev.getX(), (int)ev.getY())){
                return v;
            }
        }
        return null;
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        if (changed) {
            viewWidth = this.getWidth();
            
            getAlLViewPager(mViewPagers, this);
            Log.i(TAG, "ViewPager size = " + mViewPagers.size());
        }
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);
        if (mShadowDrawable != null && mContentView != null) {

            int left = mContentView.getLeft()
                    - mShadowDrawable.getIntrinsicWidth();
            int right = left + mShadowDrawable.getIntrinsicWidth();
            int top = mContentView.getTop();
            int bottom = mContentView.getBottom();

            mShadowDrawable.setBounds(left, top, right, bottom);
            mShadowDrawable.draw(canvas);
        }

    }


    /**
     * 滚动出界面
     */
    private void scrollRight() {
        final int delta = (viewWidth + mContentView.getScrollX());
        // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item
        mScroller.startScroll(mContentView.getScrollX(), 0, -delta + 1, 0,
                Math.abs(delta));
        postInvalidate();
    }

    /**
     * 滚动到起始位置
     */
    private void scrollOrigin() {
        int delta = mContentView.getScrollX();
        mScroller.startScroll(mContentView.getScrollX(), 0, -delta, 0,
                Math.abs(delta));
        postInvalidate();
    }

    @Override
    public void computeScroll() {
        // 调用startScroll的时候scroller.computeScrollOffset()返回true，
        if (mScroller.computeScrollOffset()) {
            mContentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
            postInvalidate();

            if (mScroller.isFinished() && isFinish) {
                mActivity.finish();
            }
        }
    }


}
package com.gaosi.teacherapp;

import com.gaosi.View.SwipeBackLayout;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Window;


/**
 * 想要实现向右滑动删除Activity效果只需要继承SwipeBackActivity即可，如果当前页面含有ViewPager
 * 只需要调用SwipeBackLayout的setViewPager()方法即可
 */
public class SwipeBackActivity extends Activity {
    protected SwipeBackLayout layout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);// 无标题
        layout = (SwipeBackLayout) LayoutInflater.from(this).inflate(
                R.layout.base, null);
        layout.attachToActivity(this);
    }
    
    
    @Override
    public void startActivity(Intent intent) {
        super.startActivity(intent);
        overridePendingTransition(R.anim.base_slide_right_in, R.anim.base_slide_remain);
    }
    //返回按钮
    @Override
    public void onBackPressed() {
        super.onBackPressed();
        overridePendingTransition(0, R.anim.base_slide_right_out);
    }


}

base

<com.gaosi.View.SwipeBackLayout 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" >
    
</com.gaosi.View.SwipeBackLayout>
base_slide_right_in
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <translate
        android:duration="300"
        android:fromXDelta="100.0%"
        android:interpolator="@android:anim/decelerate_interpolator"
        android:toXDelta="0.0%" />

</set>
R.anim.base_slide_remain
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <translate
        android:duration="300"
        android:fromXDelta="0"
        android:interpolator="@android:anim/decelerate_interpolator"
        android:toXDelta="0" />

</set>
R.anim.base_slide_right_out

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <translate
        android:duration="300"
        android:fromXDelta="0.0%"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:toXDelta="100.0%" />
</set>

shadow_left.png

使用的时候 只需要继承自SwipeBackActivity 就可以

 
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原文地址：https://www.cnblogs.com/qianyukun/p/4799938.html