处理滑块滑动
在ontouch事件的move 动作中处理：并处理滑动越界问题
case MotionEvent.ACTION_MOVE:
//处理越界问题
float rawXMove = event.getRawX();//
if(rawXMove >mWidth/2 && rawXMove <=getMeasuredWidth()-mWidth/2){
float dexX = rawXMove - mWidth/2; //变化量
scrollTo((int) ( - dexX), 0);
}
break;
注意上面的滑动越界问题，我是通过手指的位置判断的，当然你可以通过一个增加量来判断是否满足条件，如果满足不满足条件直接把偏移量置零或者最大 。注意上面的判断有个细节，我使用的是getMeasuredWidth( ) 来处理，并不是用的mWidth1,如果你是用后者，你会发现这个值非常大。会越界。这里的getMeasuredWidth()拿的值就是控件背景宽度。如果弄不明白就直接使用增加量判断
你的滑块是否能滑动呢？
如果你的滑块能点击，不能滑动，注意看你的自定义控件是否消费事件，如果没有消费事件，就是掉super方法，肯定不会处理，所以你要返回值改为true.消费时间才行，因为滑动事件和点击事件不同的！
滑块的回原点
case MotionEvent.ACTION_UP:
float endRawX = event.getRawX();
if(endRawX
scrollTo(0,0);
}else {
Toast.makeText(getContext(),"解锁成功",Toast.LENGTH_LONG).show();
}
解锁不成功，缓慢回弹
1.创建Scroller对象
2.调用startScroll 方法去滚动 ，配置滚动信息
3.出发重新绘制调用 invalidate();
4.计算滚动的偏移量。重写computerScroll( ) ，根据当前已过时间计算偏移量 返回的是boolean值，如果没结束，就是滚动还没有结束， scroller.scrollTo(X,getcriiX(),0)然后出发绘制，完整代码如下：
package com.example.z.selfscrollunlock;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Scroller;
import android.widget.Toast;
/**
* Created by z on 2017/11/25.
*/
public class SelfUnLockView extends View {
private Bitmap mBitmap;
private int mHeight;
private int mWidth;
private Paint mPaint;
private int mWidth1;
private float mRawX;
private Scroller mScroller;
private ScrollListener mListener;
public SelfUnLockView(Context context) {
this(context, null);
}
public SelfUnLockView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
mBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.switch_button);
mHeight = mBitmap.getHeight();
mWidth = mBitmap.getWidth();
mPaint = new Paint();
mScroller = new Scroller(getContext());
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
mWidth1 = MeasureSpec.makeMeasureSpec(widthMeasureSpec, MeasureSpec.EXACTLY);
setMeasuredDimension(mWidth1, mHeight);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(mBitmap, 0, 0, mPaint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mRawX = event.getRawX();
//当我手指触摸到滑块时候，滑块过来要移动这个点减去滑块一般的长度 raw
float moveX = mRawX - mWidth / 2;
if (mRawX > mWidth / 2 && mRawX scrollTo((int) -moveX, 0);
}
break;
case MotionEvent.ACTION_MOVE:
//处理越界问题
float rawXMove = event.getRawX();//
if(rawXMove >mWidth/2 && rawXMove <=getMeasuredWidth()-mWidth/2){
float dexX = rawXMove - mWidth/2; //变化量
scrollTo((int) ( - dexX), 0);
}
break;
case MotionEvent.ACTION_UP:
float endRawX = event.getRawX();
if(endRawX
/* mScroller.startScroll(getScrollX(),0,0-getScrollX(),0,500); //配置滚动信息
// invalidate();
// scrollTo(0,0);*/
int startX = getScrollX();//滚动开始时滚动偏移量
int startY = 0;
int endX = 0;//滚动最终位置的滚动偏移量
int dx = endX - startX;//滚动偏移量的变化量
int dy =0;
int duration = 1500;//滚动时长
//step2:配置滚动的成员变量
mScroller.startScroll(startX, startY, dx, dy, duration);
invalidate();//step3:触发重新绘制
}else {
Toast.makeText(getContext(),"解锁成功",Toast.LENGTH_LONG).show();
/** 出发接口方法*/
if(mListener != null){
mListener.onScrollunLock();
}
}
break;
}
return true;
}
@Override
public void computeScroll() {
if(mScroller.computeScrollOffset()){
scrollTo(mScroller.getCurrX(),0);
invalidate();
}
}
/**
* 回调函数
*/
public interface ScrollListener{
void onScrollunLock();
}
/**
* 宫外不调用的方法
*/
public void onScrollViewMethed(ScrollListener l){
this.mListener = l;
}
}
测滑菜单
需求分析：
1.继承Viewgroup
2.测量布局孩子
3.处理越界问题
package com.example.z.selfscrollunlock;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
/**
* Created by z on 2017/11/25.
*/
public class SlidingMenu extends ViewGroup {
private float mRawX;
private View mRight;
private View mLeft;
private int mMeasuredWidth;
private int mMeasuredWidth1;
public SlidingMenu(Context context) {
this(context, null);
}
public SlidingMenu(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
measureChildren(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
mLeft = getChildAt(0);
mRight = getChildAt(1);
mMeasuredWidth = mLeft.getMeasuredWidth();
mMeasuredWidth1 = mRight.getMeasuredWidth();
int measuredHeight = mLeft.getMeasuredHeight();
int measuredHeight1 = mRight.getMeasuredHeight();
mLeft.layout(-mMeasuredWidth, 0, 0, measuredHeight);
mRight.layout(0, 0, mMeasuredWidth1, measuredHeight1);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mRawX = event.getRawX();
break;
case MotionEvent.ACTION_MOVE:
float rawX1 = event.getRawX();
float v = -rawX1 + mRawX; //滚动偏移量
float finall = v + getScrollX(); //最终偏移量
if(finall >0){
scrollTo(0,0);
}else {
scrollTo(-mMeasuredWidth,0);
}
return true;
//
// int i = mMeasuredWidth1 - mMeasuredWidth;
// if (v
// v = i;
// }
// else if (v <-mMeasuredWidth) {
// v = 0;
// }
scrollTo((int) -v, 0);
// scrollBy((int) -v, 0);
// mRawX = rawX1;
}
return true;
}
}
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