Android 自定义View（3） -- 获得Bitmap的三种方法

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1. 使用BitmapFactory解析图片

public void myUseBitmapFactory(Canvas canvas){    //定义画笔      Paint paint = new Paint();    //获取资源流       Resources rec = getResources();      InputStream in = rec.openRawResource(R.drawable.haha);    //设置图片       Bitmap bitmap = BitmapFactory.decodeStream(in);    //绘制图片      canvas.drawBitmap(bitmap,0,20,paint);}

2. 使用BitmapDrawable解析图片

public void myUseBitmapDrawable(Canvas canvas){    //定义画笔      Paint paint = new Paint();    //获得资源      Resources rec = getResources();      BitmapDrawable bitDrawable = (BitmapDrawable) rec.getDrawable(R.drawable.haha);    //得到Bitmap      Bitmap bitmap = bitmapDrawable.getBitmap();    //在画板上绘制图片      canvas.drawBitmap(bitmap,20,120,paint);}

3. 使用InputStream和BitmapDrawable绘制

public void myUseInputStreamBitmapDrawable(Canvas canvas){    //定义画笔      Paint paint = new Paint();    //获得资源      Resources rec = getResources();      InputStream in = rec.openRawResource(R.drawable.haha);    //解析数据流      BitmapDrawable bitDrawable = new BitmapDrawable(in);    //得到Bitmap      Bitmap bitmap = bitmapDrawable.getBitmap();    //在画板上绘制图片      canvas.drawBitmap(bitmap,100,100,paint);}

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