Android 向右滑動關閉頁面

前言：

用最簡單的例子來說明此問題。

1.在Activity中加上默認的佈局Layout

2.在自定義的Layout中實現右滑關閉Activity的邏輯

 直接上代碼！

自定義的佈局HFFinishRelativeLayout！

package com.huofar.widget;

import android.content.Context;
import android.content.res.TypedArray;
import android.support.v4.app.FragmentActivity;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewGroup;
import android.widget.RelativeLayout;

import com.huofar.util.LogUtil;

/**
 * Created by zhangxiwei on 14/11/25.
 */
public class HFFinishRelativeLayout extends RelativeLayout{

    private static final String TAG = LogUtil.makeLogTag(HFFinishRelativeLayout.class);

    public interface ScrollLeftFinishListener{
        public void finishPage();
    }

    FragmentActivity activity;

    private ScrollLeftFinishListener scrollLeftFinishListener;

    public void setScrollLeftFinishListener(ScrollLeftFinishListener scrollLeftFinishListener) {
        this.scrollLeftFinishListener = scrollLeftFinishListener;
    }

    // 滑動距離及座標
    private float xDistance, yDistance, xLast, yLast;

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


    public HFFinishRelativeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public void attachToActivity(FragmentActivity activity) {
        this.activity = 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);
        decor.addView(this);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                break;
            case MotionEvent.ACTION_MOVE:

        }

        return super.onInterceptTouchEvent(event);
    }

    @Override

    public boolean dispatchTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                xDistance = yDistance = 0f;
                xLast = event.getX();
                yLast = event.getY();
                break;
            case MotionEvent.ACTION_MOVE:
                final float curX = event.getX();
                final float curY = event.getY();

                xDistance += Math.abs(curX - xLast);
                yDistance += Math.abs(curY - yLast);
                if (curX > xLast && xDistance > yDistance && xDistance > 300) {
                    if(scrollLeftFinishListener != null){
                        xLast = curX;
                        yLast = curY;
                        scrollLeftFinishListener.finishPage();
                        return true;
                    }
                }
                xLast = curX;
                yLast = curY;
        }
        return super.dispatchTouchEvent(event);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                break;
            case MotionEvent.ACTION_MOVE:
                break;
        }
        <strong><span style="color:#ff6666;">return true;</span></strong>
    }
}

重點觀看上面的紅色加粗字段。

我處理的是每次滑動向右滑動300px執行關閉操作，在需要的使用的Activity實現藉口直接finish就OK了！

Activity中的調用：

package com.huofar.activity;

import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;

import com.huofar.R;
import com.huofar.widget.HFFinishRelativeLayout;

/**
 * Created by zhangxiwei on 14/11/25.
 */
public class HFBaseActivity extends FragmentActivity implements HFFinishRelativeLayout.ScrollLeftFinishListener  {

    private boolean isFinishScrollLeft;
    HFFinishRelativeLayout hfFinishRelativeLayout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        isFinishScrollLeft = true;
        //延後爲了等待需要屏蔽返回滑動接受參數
        new Handler().postAtTime(new Runnable() {
            @Override
            public void run() {
                setFinishScrollLeft(isFinishScrollLeft);
            }
        },1000);
    }

    public void setFinishScrollLeft(boolean isFinishScrollLeft) {
        this.isFinishScrollLeft = isFinishScrollLeft;
        if(isFinishScrollLeft){
            if(isFinishScrollLeft) {
                hfFinishRelativeLayout = (HFFinishRelativeLayout) LayoutInflater.from(this).inflate(
                        R.layout.activity_finish_base, null);
                hfFinishRelativeLayout.attachToActivity(this);
                hfFinishRelativeLayout.setScrollLeftFinishListener(this);
            }
        }
    }


    @Override
    public void finishPage() {
        finish();
    }
}

所有的代碼就是這點，延遲一秒的就是爲了接受isFinishScrollLeft變量，我是在已有的工程中修改的，就是爲了在有些頁面不需要關閉傳此變量就OK了！。方法有點笨。大家有好方法可以提供。先多謝！

接下來就是頭疼的問題，爲什麼要這麼做：

惡補知識：1.dispatchTouchEvent 2.onInterceptTouchEvent 3.onTouchEvent 傳遞事件  直接給你們來個學習地址

http://www.cnblogs.com/sunzn/archive/2013/05/10/3064129.html

除此之外看的迷迷糊糊的可以自己寫一個demo實踐一下 或者多google幾個介紹看看，就是事件的傳遞，然後在dispatchTouchEvent接受一下。然後直接關閉就行。

其實也沒有什麼，幫助想要該功能的童鞋。

有什麼問題可以跟帖詢問。

補上activity_finish_base.xml

<?xml version="1.0" encoding="utf-8"?>
<com...widget.HFFinishRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</com....widget.HFFinishRelativeLayout>