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.SimpleOnGestureListener


ViewDragHelper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：http://blog.csdn.net/lmj623565791/article/details/46858663
http://blog.csdn.net/pi9nc/article/details/39583377