Android 保存图片到本地(兼容Android 10+)
图片保存在 DCIM 公开目录
大于 28 需使用 MediaStore
小于 29 直接 new FIle
public class ImageSaveUtil {
/**
* 保存图片到公共目录
* 29 以下，需要提前申请文件读写权限
* 29及29以上的，不需要权限
* 保存的文件在 DCIM 目录下
*
* @param context 上下文
* @param bitmap 需要保存的bitmap
* @param format 图片格式
* @param quality 压缩的图片质量
* @param recycle 完成以后，是否回收Bitmap，建议为true
* @return 文件的 uri
*/
@Nullable
public static Uri saveAlbum(Context context, Bitmap bitmap, Bitmap.CompressFormat format, int quality, boolean recycle) {
String suffix;
if (Bitmap.CompressFormat.JPEG == format)
suffix = "JPG";
else
suffix = format.name();
String fileName = System.currentTimeMillis() + "_" + quality + "." + suffix;
if (Build.VERSION.SDK_INT < 29) {
if (!isGranted(context)) {
Log.e("ImageUtils", "save to album need storage permission");
return null;
}
File picDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
File destFile = new File(picDir, fileName);
if (!save(bitmap, destFile, format, quality, recycle))
return null;
Uri uri = null;
if (destFile.exists()) {
uri = Uri.parse("file://" + destFile.getAbsolutePath());
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
intent.setData(uri);
context.sendBroadcast(intent);
}
return uri;
} else {
// Android 10 使用
Uri contentUri;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else
contentUri = MediaStore.Images.Media.INTERNAL_CONTENT_URI;
ContentValues contentValues = new ContentValues();
contentValues.put(MediaStore.Images.Media.DISPLAY_NAME, fileName);
contentValues.put(MediaStore.Images.Media.MIME_TYPE, "image/*");
contentValues.put(MediaStore.Images.Media.RELATIVE_PATH, Environment.DIRECTORY_DCIM + "/");
// 告诉系统，文件还未准备好，暂时不对外暴露
contentValues.put(MediaStore.MediaColumns.IS_PENDING, 1);
Uri uri = context.getContentResolver().insert(contentUri, contentValues);
if (uri == null) return null;
OutputStream os = null;
try {
os = context.getContentResolver().openOutputStream(uri);
bitmap.compress(format, quality, os);
// 告诉系统，文件准备好了，可以提供给外部了
contentValues.clear();
contentValues.put(MediaStore.MediaColumns.IS_PENDING, 0);
context.getContentResolver().update(uri, contentValues, null, null);
return uri;
} catch (Exception e) {
e.printStackTrace();
// 失败的时候，删除此 uri 记录
context.getContentResolver().delete(uri, null, null);
return null;
} finally {
try {
if (os != null)
os.close();
} catch (IOException e) {
// ignore
}
}
}
}
private static boolean save(Bitmap bitmap, File file, Bitmap.CompressFormat format, int quality, boolean recycle) {
if (isEmptyBitmap(bitmap)) {
Log.e("ImageUtils", "bitmap is empty.");
return false;
}
if (bitmap.isRecycled()) {
Log.e("ImageUtils", "bitmap is recycled.");
return false;
}
if (!createFile(file, true)) {
Log.e("ImageUtils", "create or delete file <$file> failed.");
return false;
}
OutputStream os = null;
boolean ret = false;
try {
os = new BufferedOutputStream(new FileOutputStream(file));
ret = bitmap.compress(format, quality, os);
if (recycle && !bitmap.isRecycled()) bitmap.recycle();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (os != null)
os.close();
} catch (IOException e) {
// ignore
}
}
return ret;
}
private static boolean isEmptyBitmap(Bitmap bitmap) {
return bitmap == null || bitmap.isRecycled() || bitmap.getWidth() == 0 || bitmap.getHeight() == 0;
}
private static boolean createFile(File file, boolean isDeleteOldFile) {
if (file == null) return false;
if (file.exists()) {
if (isDeleteOldFile) {
if (!file.delete()) return false;
} else
return file.isFile();
}
if (!createDir(file.getParentFile())) return false;
try {
return file.createNewFile();
} catch (IOException e) {
return false;
}
}
private static boolean createDir(File file) {
if (file == null) return false;
if (file.exists())
return file.isDirectory();
else
return file.mkdirs();
}
private static boolean isGranted(Context context) {
return (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || PackageManager.PERMISSION_GRANTED == ContextCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE));
}
}
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版权声明：本文为CSDN博主「OneGreenHand」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/a295268305/article/details/108880706
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