Android之十三刮刮卡中奖功能

Android之十三刮刮卡中奖功能

package com.zhy.view;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Paint.Style;
import android.graphics.BitmapFactory;
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.graphics.Rect;
import android.graphics.RectF;
import android.support.v4.widget.SlidingPaneLayout.PanelSlideListener;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

import com.example.zhy_path.R;

public class GuaGuaKa extends View
{

	/**
	 * 绘制线条的Paint,即用户手指绘制Path
	 */
	private Paint mOutterPaint = new Paint();
	/**
	 * 记录用户绘制的Path
	 */
	private Path mPath = new Path();
	/**
	 * 内存中创建的Canvas
	 */
	private Canvas mCanvas;
	/**
	 * mCanvas绘制内容在其上
	 */
	private Bitmap mBitmap;

	/**
	 * ------------------------以下是奖区的一些变量
	 */
	// private Bitmap mBackBitmap;
	private boolean isComplete;

	private Paint mBackPint = new Paint();
	private Rect mTextBound = new Rect();
	private String mText = "￥500";

	private int mLastX;
	private int mLastY;

	public GuaGuaKa(Context context)
	{
		this(context, null);
	}

	public GuaGuaKa(Context context, AttributeSet attrs)
	{
		this(context, attrs, 0);
	}

	public GuaGuaKa(Context context, AttributeSet attrs, int defStyle)
	{
		super(context, attrs, defStyle);
		init();
	}

	private void init()
	{
		mPath = new Path();
		// mBackBitmap = BitmapFactory.decodeResource(getResources(),
		// R.drawable.t2);
		setUpOutPaint();
		setUpBackPaint();

	}

	/**
	 * 初始化canvas的绘制用的画笔
	 */
	private void setUpBackPaint()
	{
		mBackPint.setStyle(Style.FILL);
		mBackPint.setTextScaleX(2f);
		mBackPint.setColor(Color.RED);
		mBackPint.setTextSize(32);
		mBackPint.getTextBounds(mText, 0, mText.length(), mTextBound);
	}

	@Override
	protected void onDraw(Canvas canvas)
	{
		// canvas.drawBitmap(mBackBitmap, 0, 0, null);
		// 绘制奖项
		canvas.drawText(mText, getWidth() / 2 - mTextBound.width() / 2,
				getHeight() / 2 + mTextBound.height() / 2, mBackPint);
		if (!isComplete)
		{
			drawPath();
			canvas.drawBitmap(mBitmap, 0, 0, null);
		}

	}

	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
	{
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);

		int width = getMeasuredWidth();
		int height = getMeasuredHeight();
		// 初始化bitmap
		mBitmap = Bitmap.createBitmap(width, height, Config.ARGB_8888);
		mCanvas = new Canvas(mBitmap);

		// 绘制遮盖层
		// mCanvas.drawColor(Color.parseColor("#c0c0c0"));
		mOutterPaint.setStyle(Paint.Style.FILL);
		mCanvas.drawRoundRect(new RectF(0, 0, width, height), 30, 30,
				mOutterPaint);
		mCanvas.drawBitmap(BitmapFactory.decodeResource(getResources(),
				R.drawable.s_title), null, new RectF(0, 0, width, height), null);
	}

	/**
	 * 设置画笔的一些参数
	 */
	private void setUpOutPaint()
	{
		// 设置画笔
		// mOutterPaint.setAlpha(0);
		mOutterPaint.setColor(Color.parseColor("#c0c0c0"));
		mOutterPaint.setAntiAlias(true);
		mOutterPaint.setDither(true);
		mOutterPaint.setStyle(Paint.Style.STROKE);
		mOutterPaint.setStrokeJoin(Paint.Join.ROUND); // 圆角
		mOutterPaint.setStrokeCap(Paint.Cap.ROUND); // 圆角
		// 设置画笔宽度
		mOutterPaint.setStrokeWidth(20);
	}

	/**
	 * 绘制线条
	 */
	private void drawPath()
	{
		mOutterPaint.setStyle(Paint.Style.STROKE);
		mOutterPaint
				.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
		mCanvas.drawPath(mPath, mOutterPaint);
	}

	@Override
	public boolean onTouchEvent(MotionEvent event)
	{
		int action = event.getAction();
		int x = (int) event.getX();
		int y = (int) event.getY();
		switch (action)
		{
		case MotionEvent.ACTION_DOWN:
			mLastX = x;
			mLastY = y;
			mPath.moveTo(mLastX, mLastY);
			break;
		case MotionEvent.ACTION_MOVE:

			int dx = Math.abs(x - mLastX);
			int dy = Math.abs(y - mLastY);

			if (dx > 3 || dy > 3)
				mPath.lineTo(x, y);

			mLastX = x;
			mLastY = y;
			break;
		case MotionEvent.ACTION_UP:
			new Thread(mRunnable).start();
			break;
		}

		invalidate();
		return true;
	}

	/**
	 * 统计擦除区域任务
	 */
	private Runnable mRunnable = new Runnable()
	{
		private int[] mPixels;

		public void run()
		{

			int w = getWidth();
			int h = getHeight();

			float wipeArea = 0;
			float totalArea = w * h;

			Bitmap bitmap = mBitmap;

			mPixels = new int[w * h];

			/**
			 * 拿到所有的像素信息
			 */
			bitmap.getPixels(mPixels, 0, w, 0, 0, w, h);

			/**
			 * 遍历统计擦除的区域
			 */
			for (int i = 0; i < w; i++)
			{
				for (int j = 0; j < h; j++)
				{
					int index = i + j * w;
					if (mPixels[index] == 0)
					{
						wipeArea++;
					}
				}
			}

			/**
			 * 根据所占百分比，进行一些操作
			 */
			if (wipeArea > 0 && totalArea > 0)
			{
				int percent = (int) (wipeArea * 100 / totalArea);
				Log.e("TAG", percent + "");

				if (percent > 70)
				{
					Log.e("TAG", "清除区域达到70%，下面自动清除");
					isComplete = true;
					postInvalidate();
				}
			}
		}

	};
}

MainActivity.java

package com.example.zhy_path;

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);
	}

<span style="font-size:18px;color:#ff0000;">}
</span>

activity_main.xml
 

<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" >

    <com.zhy.view.GuaGuaKa
        android:layout_centerInParent="true"
        android:layout_width="300dp"
        android:layout_height="100dp" />

</RelativeLayout>