Android开发之Bitmap的获取

1.使用BitmapFactory解析图片

[java] view plain copy

1. // --> 使用BitmapFactory解析图片  
2.            public void myUseBitmapFactory(Canvas canvas){  
3.            // 定义画笔  
4.               Paint paint = new Paint();  
5.            // 获取资源流  
6.               Resources rec = getResources();  
7.               InputStream in = rec.openRawResource(R.drawable.haha);  
8.            // 设置图片  
9.               Bitmap bitmap =BitmapFactory.decodeStream(in);  
10.            // 绘制图片  
11.               canvas.drawBitmap(bitmap, 0,20, paint);           
12.            }  

2.用BitmapDrawable解析图片

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1. // --> 使用BitmapDrawable解析图片  
2.            public void myUseBitmapDrawable(Canvas canvas){  
3.            // 定义画笔  
4.               Paint paint = new Paint();  
5.            // 获得资源  
6.               Resources rec = getResources();  
7.            // BitmapDrawable  
8.               BitmapDrawable bitmapDrawable = (BitmapDrawable) rec.getDrawable(R.drawable.haha);  
9.            // 得到Bitmap  
10.               Bitmap bitmap = bitmapDrawable.getBitmap();  
11.            // 在画板上绘制图片  
12.               canvas.drawBitmap(bitmap, 20,120,paint);  
13.            }  

3.用InputStream和BitmapDrawable绘制

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1. // --> 使用InputStream和BitmapDrawable解析图片  
2.          public void myUseInputStreamandBitmapDrawable(Canvas canvas){  
3.          // 定义画笔  
4.             Paint paint = new Paint();  
5.          // 获得资源  
6.             Resources rec = getResources();  
7.          // InputStream得到资源流  
8.             InputStream in = rec.openRawResource(R.drawable.haha);  
9.          // BitmapDrawable 解析数据流  
10.             BitmapDrawable bitmapDrawable =  new BitmapDrawable(in);  
11.          // 得到图片  
12.             Bitmap bitmap = bitmapDrawable.getBitmap();  
13.          // 绘制图片  
14.             canvas.drawBitmap(bitmap, 100, 100,paint);  
15.          }