自定义Layout

来源：互联网发布：java面试基础知识编辑：程序博客网时间：2024/05/29 08:42
经常写自定义滚动的Layout ，总是出问题，这次备份一下刚写的可以滑动的Layout，让新手看一下也让自己忘记的时候翻阅一下。这是一个完整的自定义类，可以替换activity中的主视图使用。
package com.yp.customscrollerview;import android.content.Context;import android.graphics.Color;import android.graphics.Point;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.animation.DecelerateInterpolator;import android.widget.FrameLayout;import android.widget.RelativeLayout;import android.widget.Scroller;import android.widget.Toast;public class CustomView extends RelativeLayout {    private Context context;    private FrameLayout leftView;    private FrameLayout midView;    private FrameLayout rightView;    Toast toast;    public CustomView(Context context) {        super(context);        init(context);    }    private void showToast(Context contxt, String text, int len) {        if (toast == null)            toast = new Toast(contxt);        toast.setDuration(len);        toast.setText(text);        toast.show();    }    private void show(String text) {        Log.i("test", text);    }    public CustomView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context);    }    Scroller mScroller;    private void init(Context context) {        mScroller = new Scroller(context, new DecelerateInterpolator());        this.context = context;        leftView = new FrameLayout(context);        leftView.setBackgroundColor(Color.RED);        midView = new FrameLayout(context);        midView.setBackgroundColor(Color.GREEN);        rightView = new FrameLayout(context);        rightView.setBackgroundColor(Color.RED);        leftView.setId(0x123);        addView(leftView);        addView(midView);        addView(rightView);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        midView.measure(widthMeasureSpec, heightMeasureSpec);        int realWidth = MeasureSpec.getSize(widthMeasureSpec);        int tempWidthMeasure = MeasureSpec.makeMeasureSpec(                (int) (realWidth * 0.8f), MeasureSpec.EXACTLY);        leftView.measure(tempWidthMeasure, heightMeasureSpec);        rightView.measure(tempWidthMeasure, heightMeasureSpec);        show("width:" + leftView.getMeasuredWidth() + "rightvieww:"                + rightView.getMeasuredWidth());    }    //    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        super.onLayout(changed, l, t, r, b);        midView.layout(l, t, r, b);        leftView.layout(l - leftView.getMeasuredWidth(), t, l, b);        rightView.layout(l + midView.getMeasuredWidth(), t,                r + rightView.getMeasuredWidth(), b);        show("___width:" + leftView.getMeasuredWidth() + "rightvieww:"                + rightView.getMeasuredWidth());    }    //    private boolean isTestCompete = false;    @Override    public boolean dispatchTouchEvent(MotionEvent ev) {        if (!isTestCompete) {            getEventType(ev);            return true;        }        if (is_event) {            show("++++++++++++++++++++++++++");            switch (ev.getActionMasked()) {            case MotionEvent.ACTION_DOWN:                break;            case MotionEvent.ACTION_MOVE:                // int curScrollX = getScrollX();                // show(curScrollX+"");//                // // showToast(context, "__" + curScrollX + "", 0);                // int dis_x = (int) (ev.getX() - point.x);                // int xx = -dis_x + curScrollX;                // int finalX = 0;                // show("dis_x: "+dis_x+"xx: "+xx+"scroll :"+curScrollX);                // if (xx < 0) {                // finalX = Math.max(xx, -leftView.getMeasuredWidth());                // } else {                // finalX = Math.min(xx, rightView.getMeasuredWidth());                //                // }                // show("finalX:  "+finalX+"");                // scrollTo(-200, 0);                // point.x = (int) ev.getX();                int curScrollX = getScrollX();                show("scroll" + curScrollX);                int dis_x = (int) (ev.getX() - point.x);                int expectX = -dis_x + curScrollX;                int finalX = 0;                show("dis_x: " + dis_x + "expectX: " + expectX + "  "                        + leftView.getMeasuredWidth());                if (expectX < 0) {                    finalX = Math.max(expectX, -leftView.getMeasuredWidth());                } else {                    finalX = Math.min(expectX, rightView.getMeasuredWidth());                }                show("finalX: " + finalX);                scrollTo(finalX, 0);                point.x = (int) ev.getX();                break;            case MotionEvent.ACTION_CANCEL:            case MotionEvent.ACTION_UP:                curScrollX = getScrollX();                if (Math.abs(curScrollX) > leftView.getMeasuredWidth() >> 1) {                    if (curScrollX < 0) {                        mScroller.startScroll(curScrollX, 0,                                -leftView.getMeasuredWidth() - curScrollX, 0,                                200);                    } else {                        mScroller.startScroll(curScrollX, 0,                                leftView.getMeasuredWidth() - curScrollX, 0,                                200);                    }                } else {                    mScroller.startScroll(curScrollX, 0, -curScrollX, 0, 200);                }                invalidate();                is_event = false;                isTestCompete = false;                break;            }        } else {            is_event = false;            isTestCompete = false;        }        return super.dispatchTouchEvent(ev);    }    private Point point = new Point();    final int TEST_DIS = 20;    boolean is_event;    private void getEventType(MotionEvent ev) {        show("+++++++++++getEventType+++++++++++++++");        switch (ev.getActionMasked()) {        case MotionEvent.ACTION_DOWN:            point.x = (int) ev.getX();            point.y = (int) ev.getY();            super.dispatchTouchEvent(ev);            break;        case MotionEvent.ACTION_MOVE:            int dX = (int) Math.abs(ev.getX() - point.x);            int dY = (int) Math.abs(ev.getY() - point.y);            if (dX >= TEST_DIS && dX > dY) {                // 左右滑动                is_event = true;                isTestCompete = true;                point.x = (int) ev.getX();                point.y = (int) ev.getY();            } else if (dY >= TEST_DIS && dY > dX) {                // 上下滑动                is_event = false;                isTestCompete = true;                point.x = (int) ev.getX();                point.y = (int) ev.getY();            }            break;        case MotionEvent.ACTION_UP:        case MotionEvent.ACTION_CANCEL:            super.dispatchTouchEvent(ev);            is_event = false;            isTestCompete = false;            break;        }    }    @Override    public void computeScroll() {        super.computeScroll();        if (!mScroller.computeScrollOffset()) {            return;        }        int tempX = mScroller.getCurrX();        scrollTo(tempX, 0);    }    @Override    public boolean onTouchEvent(MotionEvent event) {        // TODO Auto-generated method stub        return super.onTouchEvent(event);    }    // class Point{    // public int x;    // public int y;    // }}
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