Android 滑动解锁

最新推荐文章于 2021-05-31 15:09:14 发布

永不求人

最新推荐文章于 2021-05-31 15:09:14 发布

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分类专栏： Android解锁文章标签： android slidelock

本文链接：https://blog.youkuaiyun.com/weiye666/article/details/78112078

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本文介绍了如何在Android中实现滑动解锁功能，包括activity_main.xml布局设计、自定义View类的编写、自定义接口类的实现以及MainActivity类的主要逻辑。欢迎大神和读者提供宝贵意见。

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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);
                }
            }
        });
    }
}