Android Bitmap与String的相互转换

1. String转换成Bitmap

public Bitmap stringToBitmap(String string) {
	// 将字符串转换成Bitmap类型
	Bitmap bitmap = null;
	try {
		byte[] bitmapArray;
		bitmapArray = Base64.decode(string, Base64.DEFAULT);
		bitmap = BitmapFactory.decodeByteArray(bitmapArray, 0,
				bitmapArray.length);
	} catch (Exception e) {
		e.printStackTrace();
	}
	return bitmap;
}

2. Bitmap转换成String

public String bitmapToString(Bitmap bitmap){
	//将Bitmap转换成字符串
	String string=null;
	ByteArrayOutputStream bStream=new ByteArrayOutputStream();
	bitmap.compress(CompressFormat.PNG,100,bStream);
	byte[]bytes=bStream.toByteArray();
	string=Base64.encodeToString(bytes,Base64.DEFAULT);
	return string;
}

3. 使用示例

public void Test(){
	ImageView img = (ImageView) findViewById(R.id.img);

	//首先将图片转换成bitmap，然后将bitmap转换成String
	Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
	String bitmapString = bitmapToString(bitmap);

	//将String转换成Bitmap之后，通过setImageBitmap将图片显示出来
	img.setImageBitmap(stringToBitmap(bitmapString));
}