<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main"android:layout_width="match_parent" android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"android:gravity="center_horizontal"tools:context="com.example.a7_.MainActivity"><com.example.a7_.MyView android:layout_alignParentBottom="true" android:id="@+id/mv" android:background="@mipmap/lockviewbg" android:layout_width="wrap_content" android:layout_height="wrap_content" /></RelativeLayout>
package com.example.a7_; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Paint; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.widget.Scroller; /** * Created by Administrator on 2017.05.28.0028. */ public class MyView extends View { private final Bitmap slidBitmap; private final Bitmap bgBitmap; private int startx; private int destance; private float endx; private final Scroller scroller; public MyView(Context context, AttributeSet attrs) { super(context, attrs); //加载图片资源 slidBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.switch_button); bgBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.lockviewbg); //创建scroller对象 scroller = new Scroller(context); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { //设置自定义控件的宽和高,,以背景图片为标准 setMeasuredDimension(bgBitmap.getWidth(),bgBitmap.getHeight()); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); //绘制图片 canvas.drawBitmap(slidBitmap,0,0,null); } //设置滑块的触摸事件 @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()){ case MotionEvent.ACTION_DOWN: //当手指按下的时候,记录坐标 startx = (int) event.getX(); break; case MotionEvent.ACTION_MOVE: //当手指移动的时候,记录移动的距离 destance = (int)(event.getX()-startx); //限制滑块移动的区间 if (destance<0){ destance = 0; }else if (destance>bgBitmap.getWidth()-slidBitmap.getWidth()){ destance = bgBitmap.getWidth()-slidBitmap.getWidth(); } //将滑块移动至该位置 scrollTo( -destance,0); break; case MotionEvent.ACTION_UP: //当手指离开时,记录手指离开的位置 if (destance<bgBitmap.getWidth()-slidBitmap.getWidth()){ //手指抬起时,如果滑块不在右边,那就让他回到左边 startx = destance; int dx = 0-destance; scroller.startScroll(startx,0,dx,0); invalidate(); }else { //开启解锁 listener.onUnlock(this); } break; } invalidate(); return true; } //重写computeScroll方法 调用invalidate之后 会调用draw draw会调用到这个computeScroll @Override public void computeScroll() { if (scroller.computeScrollOffset()){ //获取滑块当前的位置 int currx = scroller.getCurrX(); scrollTo(-currx,0); //重新绘制 invalidate(); } } //设置一个解锁的接口 interface onUnLockListener{ void onUnlock(MyView view); } private onUnLockListener listener; public void setOnLockListener(onUnLockListener listener){ this.listener = listener; } }##核心代码 package com.example.a7_; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class MainActivity extends AppCompatActivity { private MyView myView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //初始化控件 myView = (MyView) findViewById(R.id.mv); //设置监听事件 myView.setOnLockListener(new MyView.onUnLockListener() { @Override public void onUnlock(MyView view) { //触发监听,结束页面 finish(); } }); } } 
