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>
