android view移动总结

第一类原理：layout方式

1、直接调用viewgroup的layout（）方法来layout子view。麻烦的是你要计算出left、top、right、bottom这四个参数的值2、使用MarginLayoutParam，使view的外层ViewGroup来layout该view。一般都这么写：

ViewGroup.MarginLayoutParams layoutParams = view.getLayoutParams();
//        layoutParams.bottomMargin =
//        layoutParams.leftMargin =
        view.requestLayout();

第二类：scrollTo

适用于容器的内容的长度大于该view的可见区，例如scrollview。

第三类：view的setTranslationY和setTranslationX

第四类：view.offsetLeftAndRight(offset)和offsetTopAndBottom(offset)

手势相关：

GestureDetector：无限制ViewDragHelper：用在自定义viewgroup中。

GestureDetector用法：

view.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                gestureDetector.onTouchEvent(event);
                return false;
            }
        });
或者在自定义view的onTouchEvent（）中gestureDetector.onTouchEvent(event);Listener一般用GestureDetector.SimpleOnGestureListenerViewDragHelper用法：

package com.example.vdh;

import android.content.Context;
import android.graphics.Point;
import android.support.v4.widget.ViewDragHelper;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;

/**
 * ViewDragHelper 的使用
 *
 */
public class VDHLayout extends LinearLayout {
    private ViewDragHelper mDragger;
    private View mFirstView,mSecondView,mThirdView;
    private Point secondPosition = new Point(); //记录第二个view的左和顶部的位置

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

    public VDHLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
        mDragger = ViewDragHelper.create(this, 1.0f, new ViewDragHelper.Callback()
        {
            @Override
            public boolean tryCaptureView(View child, int pointerId)
            {
                //mFirstView禁止直接移动
                return child == mSecondView || child == mThirdView;
            }

            @Override
            public int clampViewPositionHorizontal(View child, int left, int dx)
            {
                return left;
            }

            @Override
            public int clampViewPositionVertical(View child, int top, int dy)
            {
                return top;
            }

            //手指释放的时候回调
            @Override
            public void onViewReleased(View releasedChild, float xvel, float yvel)
            {
                //mAutoBackView手指释放时可以自动回去
                if (releasedChild == mSecondView)
                {
                    mDragger.settleCapturedViewAt(secondPosition.x, secondPosition.y);
                    invalidate();
                }
            }

            //在边界拖动时回调
            @Override
            public void onEdgeDragStarted(int edgeFlags, int pointerId)
            {
                mDragger.captureChildView(mFirstView, pointerId);
            }
        });
        mDragger.setEdgeTrackingEnabled(ViewDragHelper.EDGE_LEFT);
    }

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

    @Override
    public boolean onInterceptHoverEvent(MotionEvent event) {
        return mDragger.shouldInterceptTouchEvent(event);   //由mDragger来处理intercept
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        mDragger.processTouchEvent(event);
        return true;    //mDragger已处理，直接返回true
    }

    @Override
    public void computeScroll() {
        if(mDragger.continueSettling(true)){
            invalidate();
        }

    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed,l,t,r,b);
        //记住mSecondView的位置
        secondPosition.x = mSecondView.getLeft();
        secondPosition.y = mSecondView.getTop();
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();
        mFirstView = getChildAt(0);
        mSecondView = getChildAt(1);
        mThirdView = getChildAt(2);
    }
}
Activity中xml布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
        >
    <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Hello World, MyActivity"
            />
    <com.example.vdh.VDHLayout android:layout_width="match_parent"
                               android:layout_height="match_parent"
                               android:orientation="vertical"
            android:gravity="center">

        
        <View android:layout_width="80dp" android:layout_height="80dp"
                android:background="#666666"/>

        <View android:layout_width="80dp" android:layout_height="80dp"
                   android:background="#ee6666"/>

        <View android:layout_width="80dp" android:layout_height="80dp"
                   android:background="#55ff66"/>
    </com.example.vdh.VDHLayout>
</LinearLayout>
效果：

参考：/article/1580250.html

http://blog.csdn.net/pi9nc/article/details/39583377