Android 滑动解锁

activity_main.xml布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:test="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.slideunlock_demo1.MainActivity">    <com.example.slideunlock_demo1.SlideLock        android:id="@+id/slideLock"        android:layout_width="match_parent"        android:layout_height="match_parent" />    <ImageView        android:visibility="gone"        android:id="@+id/imageView"        android:src="@drawable/bd"        android:layout_width="match_parent"        android:layout_height="match_parent" /></RelativeLayout>

自定义View类

package com.example.slideunlock_demo1;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.Toast;/** * created by 王志伟 at 2017/9/27 */public class SlideLock extends View {    private Bitmap jiesuo_bg;    private Bitmap jiesuo_button;    private int bg_width;    private int bg_height;    private int block_width;    private int measuredWidth;    private int measuredHeight;    private float downX;    private float downY;    private float currentX;    private float currentY;    private boolean isOnBlock;    private int left;    private int right;    private OnUnlockListener onUnlockListener;    public SlideLock(Context context) {        super(context);        init();    }    public SlideLock(Context context, AttributeSet attrs) {        super(context, attrs);        init();    }    public SlideLock(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    private void init() {        jiesuo_bg = BitmapFactory.decodeResource(getResources(), R.mipmap.jiesuo_bg);        jiesuo_button = BitmapFactory.decodeResource(getResources(), R.mipmap.jiesuo_button);        bg_width = jiesuo_bg.getWidth();        bg_height = jiesuo_bg.getHeight();        block_width = jiesuo_button.getWidth();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawBitmap(jiesuo_bg, measuredWidth / 2 - bg_width / 2, measuredHeight / 2 - bg_height / 2, null);        //控制边界        if (currentX < left) {            currentX = left;        } else if (currentX > right) {            currentX = right;        }        canvas.drawBitmap(jiesuo_button, currentX, currentY, null);    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        measuredWidth = getMeasuredWidth();        measuredHeight = getMeasuredHeight();        //获取一开始的位置        currentX = measuredWidth / 2 - bg_width / 2;        currentY = measuredHeight / 2 - bg_height / 2;        left = measuredWidth / 2 - bg_width / 2;        right = measuredWidth / 2 + bg_width / 2 - block_width;    }    @Override    public boolean onTouchEvent(MotionEvent event) {        switch (event.getAction()) {            case MotionEvent.ACTION_DOWN:                //判断手指是否按在了小球上                downX = event.getX();                downY = event.getY();                isOnBlock = isOnBlock(downX, downY);                if (isOnBlock) {                    Toast.makeText(getContext(), "按到了", Toast.LENGTH_SHORT).show();                }                break;            case MotionEvent.ACTION_MOVE:                if (isOnBlock) {                    //获取最新的位置                    float moveX = event.getX();                    currentX = moveX - block_width / 2;                    invalidate();                }                break;            case MotionEvent.ACTION_UP:                isOnBlock = false;                if (currentX < right - 5) {                    //应该弹回去                    currentX = left;                } else {                    if (onUnlockListener != null) {                        Toast.makeText(getContext(), "解锁", Toast.LENGTH_SHORT).show();                        onUnlockListener.setUnlock(true);                    }                }                invalidate();                break;            case MotionEvent.ACTION_CANCEL:                break;        }        return true;    }    /**     * @param downX     * @param downY     * @return     */    private boolean isOnBlock(float downX, float downY) {        //先计算圆心点        float rx = currentX + block_width / 2;        float ry = currentY + block_width / 2;        double distance = Math.sqrt((downX - rx) * (downX - rx) + (downY - ry) * (downY - ry));        if (distance < block_width / 2) {            return true;        }        return false;    }    public void setOnUnlockListener(OnUnlockListener onUnlockListener) {        this.onUnlockListener = onUnlockListener;    }}

自定义接口类

package com.example.slideunlock_demo1;/** * created by 王志伟 at 2017/9/27 */public interface OnUnlockListener {    void setUnlock(boolean unlock);}

MainActivity类

package com.example.slideunlock_demo1;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.ImageView;public class MainActivity extends AppCompatActivity {    private SlideLock slideLock;    private ImageView imageView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();    }    private void initView() {        slideLock = (SlideLock) findViewById(R.id.slideLock);        imageView = (ImageView) findViewById(R.id.imageView);        slideLock.setOnUnlockListener(new OnUnlockListener() {            @Override            public void setUnlock(boolean unlock) {                if (unlock) {                    slideLock.setVisibility(View.GONE);                    imageView.setVisibility(View.VISIBLE);                }            }        });    }}

以上就是简单实现一个滑动解锁了，希望大神多多指点，广大读者留言建议！！！