将bitmap保存到sd卡

最新推荐文章于 2021-05-28 05:58:31 发布

转载最新推荐文章于 2021-05-28 05:58:31 发布 · 904 阅读

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本文介绍了如何使用Java代码将Bitmap对象保存到SD卡中，包括生成唯一文件名、压缩图片为PNG格式并写入文件的过程。

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/**
* Store image to SD card.
*/
private String storeImageToFile(Bitmap bitmap){
if(bitmap == null){
return null;
}

int count = 15; //the number which will prevent the create segment locked.
File file = null;
RandomAccessFile accessFile = null;
int MagicNum;
String path = null;

do{
MagicNum = (int)mRandom.nextLong();
path = path + "/" + String.valueOf(MagicNum) + ".png";
file = new File(path);
count--;
}while(!file.exists() && count > 0);

ByteArrayOutputStream steam = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 100, steam);
byte[] buffer = steam.toByteArray();

try {
accessFile = new RandomAccessFile(file, "rw");
accessFile.write(buffer);
} catch (Exception e) {
return null;
}

try {
steam.close();
accessFile.close();
} catch (IOException e) {
//Note: do nothing.
}

return path;
}