Android 刮刮乐

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    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"
    tools:context=".MainActivity" >

    <!--
    <com.example.rubbler.Text_Rubbler
        android:id="@+id/rubbler"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:gravity="center"
        android:text="@string/hello_world" />
    -->

    <com.example.rubbler.Image_Rubbler
        android:id="@+id/rubbler"
        android:background="@drawable/girl1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:gravity="center" />

</RelativeLayout>

package com.example.rubbler;

import com.example.rubbler.R;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity
{
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //Text_Rubbler rubbler =  (Text_Rubbler)this.findViewById(R.id.rubbler);
        Image_Rubbler rubbler = (Image_Rubbler) this.findViewById(R.id.rubbler);
        rubbler.beginRubbler(0xffff0000, 40, 50);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

package com.example.rubbler;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.widget.ImageView;

public class Image_Rubbler extends ImageView
{
    private float TOUCH_TOLERANCE; //填充距离，使线条更自然，柔和,值越小，越柔和。
    //  private final int bgColor;
    private Bitmap mBitmap;
    private Canvas mCanvas;
    private Paint mPaint;
    private Path mPath;
    private float mX, mY;
    private boolean isDraw = false;

    public Image_Rubbler(Context context)
    {
        super(context);
    }

    public Image_Rubbler(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        //      bgColor = attrs.getAttributeIntValue("http://schemas.android.com/apk/res/android", "textColor", 0xFFFFFF);
        //      System.out.println("Color:"+bgColor);
    }

    public Image_Rubbler(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        //      bgColor = attrs.getAttributeIntValue("http://schemas.android.com/apk/res/android", "textColor", 0xFFFFFF);
        //      System.out.println(bgColor);
        //      System.out.println(attrs.getAttributeValue("http://schemas.android.com/apk/res/android", "layout_width"));
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);
        if (isDraw)
        {
            mCanvas.drawPath(mPath, mPaint);
            canvas.drawBitmap(mBitmap, 0, 0, null);
        }
    }

    /**
     * 开启檫除功能
     * @param bgColor 覆盖的背景颜色
     * @param paintStrokeWidth 触点（橡皮）宽度
     * @param touchTolerance 填充距离,值越小，越柔和。
     */
    public void beginRubbler(final int bgColor , final int paintStrokeWidth , float touchTolerance)
    {
        TOUCH_TOLERANCE = touchTolerance;
        //设置画笔
        mPaint = new Paint();
        //mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
        //或者
        mPaint.setAlpha(0);
        mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND); //前圆角
        mPaint.setStrokeCap(Paint.Cap.ROUND); //后圆角
        mPaint.setStrokeWidth(paintStrokeWidth); //笔宽
        //痕迹
        mPath = new Path();
        //覆盖
        //      if (getLayoutParams().width == LayoutParams.FILL_PARENT) {
        //          
        //      }
        int width = this.getResources().getDrawable(R.drawable.girl1).getIntrinsicWidth();
        int height = this.getResources().getDrawable(R.drawable.girl1).getIntrinsicHeight();
        mBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
        mCanvas = new Canvas(mBitmap);
        mCanvas.drawColor(bgColor);
        isDraw = true;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        if (!isDraw)
        {
            return true;
        }
        switch (event.getAction())
        {
            case MotionEvent.ACTION_DOWN: //触点按下
                //                          touchDown(event.getRawX(),event.getRawY());
                touchDown(event.getX(), event.getY());
                invalidate();
                break;
            case MotionEvent.ACTION_MOVE: //触点移动
                touchMove(event.getX(), event.getY());
                invalidate();
                break;
            case MotionEvent.ACTION_UP: //触点弹起
                touchUp(event.getX(), event.getY());
                invalidate();
                break;
            default:
                break;
        }
        return true;
    }

    private void touchDown(float x , float y)
    {
        mPath.reset();
        mPath.moveTo(x, y);
        mX = x;
        mY = y;
    }

    private void touchMove(float x , float y)
    {
        float dx = Math.abs(x - mX);
        float dy = Math.abs(y - mY);
        if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE)
        {
            mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
            mX = x;
            mY = y;
        }
    }

    private void touchUp(float x , float y)
    {
        mPath.lineTo(x, y);
        mCanvas.drawPath(mPath, mPaint);
        mPath.reset();
        int w = mBitmap.getWidth();
        int h = mBitmap.getHeight();
        int[] pixels = new int[w * h];
        try
        {
            /*
                                     参数
            pixels      接收位图颜色值的数组
            offset      写入到pixels[]中的第一个像素索引值
            stride      pixels[]中的行间距个数值(必须大于等于位图宽度)。可以为负数
            x           从位图中读取的第一个像素的x坐标值。
            y           从位图中读取的第一个像素的y坐标值
            width       从每一行中读取的像素宽度
            height 　　 读取的行数
            */
            mBitmap.getPixels(pixels, 0, w, 0, 0, w, h);
            int rubblerCount = 0;
            int bitmapCount = pixels.length;
            for (int i = 0; i < bitmapCount; i++)
            {
                if (pixels[i] != 0xffff0000)
                {
                    rubblerCount++;
                }
            }
            if (rubblerCount > bitmapCount * 0.3)
            {
                setFlickerAnimation(this);
                Paint paint = new Paint();
                paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
                mCanvas.drawPaint(paint);
                isDraw = false;
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    //闪烁
    private void setFlickerAnimation(ImageView iv_chat_head)
    {
        final Animation animation = new AlphaAnimation(1, 0); // Change alpha from fully visible to invisible  
        animation.setDuration(50); // duration - half a second  
        animation.setInterpolator(new LinearInterpolator()); // do not alter animation rate  
        //        animation.setRepeatCount(Animation.INFINITE); // Repeat animation infinitely 
        //        animation.setRepeatCount(2); // Repeat animation infinitely  
        animation.setRepeatMode(Animation.REVERSE); //   
        iv_chat_head.setAnimation(animation);
    }
}

 

package com.example.rubbler;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.TextView;

public class Text_Rubbler extends TextView
{
    private float TOUCH_TOLERANCE; //填充距离，使线条更自然，柔和,值越小，越柔和。
    //  private final int bgColor;
    private Bitmap mBitmap;
    private Canvas mCanvas;
    private Paint mPaint;
    private Path mPath;
    private float mX, mY;
    private boolean isDraw = false;

    public Text_Rubbler(Context context)
    {
        super(context);
    }

    public Text_Rubbler(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        //      bgColor = attrs.getAttributeIntValue("http://schemas.android.com/apk/res/android", "textColor", 0xFFFFFF);
        //      System.out.println("Color:"+bgColor);
    }

    public Text_Rubbler(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        //      bgColor = attrs.getAttributeIntValue("http://schemas.android.com/apk/res/android", "textColor", 0xFFFFFF);
        //      System.out.println(bgColor);
        //      System.out.println(attrs.getAttributeValue("http://schemas.android.com/apk/res/android", "layout_width"));
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);
        if (isDraw)
        {
            mCanvas.drawPath(mPath, mPaint);
            //          mCanvas.drawPoint(mX, mY, mPaint);
            canvas.drawBitmap(mBitmap, 0, 0, null);
        }
    }

    /**
     * 开启檫除功能
     * @param bgColor 覆盖的背景颜色
     * @param paintStrokeWidth 触点（橡皮）宽度
     * @param touchTolerance 填充距离,值越小，越柔和。
     */
    public void beginRubbler(final int bgColor , final int paintStrokeWidth , float touchTolerance)
    {
        TOUCH_TOLERANCE = touchTolerance;
        //设置画笔
        mPaint = new Paint();
        //          mPaint.setAlpha(0);
        //画笔划过的痕迹就变成透明色了
        mPaint.setColor(Color.BLACK); //此处不能为透明色
        mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
        //或者
        //                  mPaint.setAlpha(0);
        //                  mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND); //前圆角
        mPaint.setStrokeCap(Paint.Cap.ROUND); //后圆角
        mPaint.setStrokeWidth(paintStrokeWidth); //笔宽
        //痕迹
        mPath = new Path();
        ;
        //覆盖
        //      if (getLayoutParams().width == LayoutParams.FILL_PARENT) {
        //          
        //      }
        mBitmap = Bitmap.createBitmap(getLayoutParams().width, getLayoutParams().height, Config.ARGB_8888);
        mCanvas = new Canvas(mBitmap);
        mCanvas.drawColor(bgColor);
        isDraw = true;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        if (!isDraw)
        {
            return true;
        }
        switch (event.getAction())
        {
            case MotionEvent.ACTION_DOWN: //触点按下
                //          touchDown(event.getRawX(),event.getRawY());
                touchDown(event.getX(), event.getY());
                invalidate();
                break;
            case MotionEvent.ACTION_MOVE: //触点移动
                touchMove(event.getX(), event.getY());
                invalidate();
                break;
            case MotionEvent.ACTION_UP: //触点弹起
                touchUp(event.getX(), event.getY());
                invalidate();
                break;
            default:
                break;
        }
        return true;
    }

    private void touchDown(float x , float y)
    {
        mPath.reset();
        mPath.moveTo(x, y);
        mX = x;
        mY = y;
    }

    private void touchMove(float x , float y)
    {
        float dx = Math.abs(x - mX);
        float dy = Math.abs(y - mY);
        if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE)
        {
            mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
            mX = x;
            mY = y;
        }
    }

    private void touchUp(float x , float y)
    {
        mPath.lineTo(x, y);
        mCanvas.drawPath(mPath, mPaint);
        mPath.reset();
    }
}