Android 向右滑动销毁（finish）Activity, 随着手势的滑动而滑动并跳转的效果(二)

写这篇文章是因为看了：http://blog.youkuaiyun.com/jdsjlzx/article/details/21231217这篇文章，并下载了demo运行了下。

现对其做了一些修改:

(1) 不在通过setTouchView来处理事件，采用事件拦截机制

(2)加入了右侧滑动机制

(3)不在对整个activity的触摸都有效，采用了触摸点判断，使其只是左右边界时才有效，从而是activity的触摸事件和listview等控件的滚动相分开

(4)加入左右滑动切换机制的禁用与开启功能，使其更方便

 

本文只贴上部分代码，不做原理讲述，如果你没有看上一篇：Android 向右滑动销毁（finish）Activity, 随着手势的滑动而滑动的效果(一)，请先看一遍。

demo中使用需要注意的地方，在代码中都有注释，有任何问题欢迎联系。

 

1、activity布局，根节点使用定义的view(只对需要滑动的布局加即可)

<?xml version="1.0" encoding="utf-8"?>
<com.example.view.SildingFinishLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/slidingLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal"
        android:background="#88ff90" >
        <Button
            android:id="@+id/button1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="单向滑动"
            />
       
    </LinearLayout>

</com.example.view.SildingFinishLayout>

2、SildingFinishLayout的实现

public class SildingFinishLayout extends RelativeLayout{
	private final String TAG = SildingFinishLayout.class.getName();
	
	/**
	 * SildingFinishLayout布局的父布局
	 */
	private ViewGroup mParentView;
	
	/**
	 * 滑动的最小距离
	 */
	private int mTouchSlop;
	/**
	 * 按下点的X坐标
	 */
	private int downX;
	/**
	 * 按下点的Y坐标
	 */
	private int downY;
	/**
	 * 临时存储X坐标
	 */
	private int tempX;
	/**
	 * 滑动类
	 */
	private Scroller mScroller;
	/**
	 * SildingFinishLayout的宽度
	 */
	private int viewWidth;
	/**
	 * 记录是否正在滑动
	 */
	private boolean isSilding;
	
	private OnSildingFinishListener onSildingFinishListener;
	
	private boolean enableLeftSildeEvent = true; //是否开启左侧切换事件
	private boolean enableRightSildeEvent = true; // 是否开启右侧切换事件
	private final int size = 20; //按下时范围(处于这个范围内就启用切换事件，目的是使当用户从左右边界点击时才响应)
	private boolean isIntercept = false; //是否拦截触摸事件
	private boolean canSwitch;//是否可切换
	private boolean isSwitchFromLeft = false; //左侧切换
	private boolean isSwitchFromRight = false; //右侧侧切换
	

	public SildingFinishLayout(Context context, AttributeSet attrs) {
		this(context, attrs, 0);
	}

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

		mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
		Log.e(TAG, "设备的最小滑动距离:" + mTouchSlop);
		mScroller = new Scroller(context);
	}

	@Override
	protected void onLayout(boolean changed, int l, int t, int r, int b) {
		super.onLayout(changed, l, t, r, b);
		if (changed) {
			// 获取SildingFinishLayout所在布局的父布局
			mParentView = (ViewGroup) this.getParent();
			viewWidth = this.getWidth();
		}
		Log.e(TAG, "viewWidth=" + viewWidth);
	}
	
	
	public void setEnableLeftSildeEvent(boolean enableLeftSildeEvent) {
		this.enableLeftSildeEvent = enableLeftSildeEvent;
	}
	
	
	public void setEnableRightSildeEvent(boolean enableRightSildeEvent) {
		this.enableRightSildeEvent = enableRightSildeEvent;
	}
	

	/**
	 * 设置OnSildingFinishListener, 在onSildingFinish()方法中finish Activity
	 * 
	 * @param onSildingFinishListener
	 */
	public void setOnSildingFinishListener(
			OnSildingFinishListener onSildingFinishListener) {
		this.onSildingFinishListener = onSildingFinishListener;
	}
	
	//是否拦截事件，如果不拦截事件，对于有滚动的控件的界面将出现问题(相冲突)
	@Override
	public boolean onInterceptTouchEvent(MotionEvent ev) {
		float downX = ev.getRawX();
		Log.e(TAG, "downX =" + downX + ",viewWidth=" + viewWidth);
		if(enableLeftSildeEvent && downX < size){
			Log.e(TAG, "downX 在左侧范围内 ,拦截事件");
			isIntercept = true;
			isSwitchFromLeft = true;
			isSwitchFromRight = false;
			return true;
		}else if(enableRightSildeEvent && downX > (viewWidth - size)){
			Log.e(TAG, "downX 在右侧范围内 ,拦截事件");
			isIntercept = true;
			isSwitchFromRight = true;
			isSwitchFromLeft = false;
			return true;
		}else{
			Log.e(TAG, "downX 不在范围内 ,不拦截事件");
			isIntercept = false;
			isSwitchFromLeft = false;
			isSwitchFromRight = false;
		}
		return super.onInterceptTouchEvent(ev);
	}


	@Override
	public boolean onTouchEvent(MotionEvent event) {
		if(!isIntercept){//不拦截事件时 不处理
			return false;
		}
		switch (event.getAction()){
		case MotionEvent.ACTION_DOWN:
			downX = tempX = (int) event.getRawX();
			downY = (int) event.getRawY();
			break;
		case MotionEvent.ACTION_MOVE:
			int moveX = (int) event.getRawX();
			int deltaX = tempX - moveX;	
			tempX = moveX;
			if (Math.abs(moveX - downX) > mTouchSlop && Math.abs((int) event.getRawY() - downY) < mTouchSlop) {
				isSilding = true;
			}
			
			Log.e(TAG, "scroll deltaX=" + deltaX);			
			if(enableLeftSildeEvent){//左侧滑动
				if (moveX - downX >= 0 && isSilding) {
					mParentView.scrollBy(deltaX, 0);
				}
			}
			
			if(enableRightSildeEvent){//右侧滑动
				if (moveX - downX <= 0 && isSilding) {
					mParentView.scrollBy(deltaX, 0);
				}
			}
			
			Log.e(TAG + "/onTouchEvent", "mParentView.getScrollX()=" + mParentView.getScrollX());
			break;
		case MotionEvent.ACTION_UP:
			isSilding = false;
			//mParentView.getScrollX() <= -viewWidth / 2  ==>指左侧滑动
			//mParentView.getScrollX() >= viewWidth / 2   ==>指右侧滑动
			if (mParentView.getScrollX() <= -viewWidth / 2 || mParentView.getScrollX() >= viewWidth / 2) {
				canSwitch = true;
				if(isSwitchFromLeft){
					scrollToRight();
				}
				
				if(isSwitchFromRight){
					scrollToLeft();
				}
			} else {
				scrollOrigin();
				canSwitch = false;
			}
			break;
		}
		return true;
	}
	
	
	/**
	 * 滚动出界面至右侧
	 */
	private void scrollToRight() {
		final int delta = (viewWidth + mParentView.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(mParentView.getScrollX(), 0, -delta + 1, 0, Math.abs(delta));
		postInvalidate();
	}
	
	/**
	 * 滚动出界面至左侧
	 */
	private void scrollToLeft() {
		final int delta = (viewWidth - mParentView.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(mParentView.getScrollX(), 0, delta - 1, 0, Math.abs(delta));//此处就不可用+1，也不卡直接用delta
		postInvalidate();
	}

	/**
	 * 滚动到起始位置
	 */
	private void scrollOrigin() {
		int delta = mParentView.getScrollX();
		mScroller.startScroll(mParentView.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()) {
			mParentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
			postInvalidate();

			if (mScroller.isFinished()) {
				if (onSildingFinishListener != null && canSwitch) {
					Log.e(TAG, "mScroller finish");
					if(isSwitchFromLeft){//回调，左侧切换事件
						onSildingFinishListener.onSildingBack();
					}
					
					if(isSwitchFromRight){//右侧切换事件
						onSildingFinishListener.onSildingForward();
					}
				}
			}
		}
	}
	

	public interface OnSildingFinishListener {
		public void onSildingBack();
		public void onSildingForward();
	}

}

3、BaseActivity

/**
 * 1. 必须设置透明风格,设置透明后需对Activity设置一个背景色，其遮盖效果
 * 2. 要调用initBaseActivity(boolean enableLeftSilde, boolean enableRigftSilde)
 * 
 * @ enableLeftSilde : 开启左侧
 * @ enableRightSilde : 开启右侧
 * 
 * */
public class BaseActivity extends Activity implements OnSildingFinishListener{
	private SildingFinishLayout sildingLayout;
	
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
	}
	
	/**
	 * @enableLeftSilde : 开启左侧
 	 * @enableRightSilde : 开启右侧
 	 * */
	public void initBaseActivity(boolean enableLeftSilde, boolean enableRigftSilde){
		sildingLayout = (SildingFinishLayout) findViewById(R.id.slidingLayout);
		sildingLayout.setOnSildingFinishListener(this);
		sildingLayout.setEnableLeftSildeEvent(enableLeftSilde);
		sildingLayout.setEnableRightSildeEvent(enableRigftSilde);
	}


	@Override
	public void onSildingBack() {
		Toast.makeText(getApplicationContext(), "back", Toast.LENGTH_SHORT).show();
		finish();
	}


	@Override
	public void onSildingForward() {
		Toast.makeText(getApplicationContext(), "前进", Toast.LENGTH_SHORT).show();
		finish();
	}
}

 

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下载地址:  Activity滑动跳转