问题描述
MANAGE_EXTERNAL_STORAGE 特殊权限在重启后被撤销 您好!重现问题的步骤
Boooom 转到系统设置并检查访问所有文件权限。
解决方法
我为 Android 11 实现了这样的代码,并且在重新启动时不会撤销存储访问
如果您的目标是 Android 11 (targetSdkVersion 30
),那么您需要在 AndroidManifest.xml 中获得以下权限以进行修改和文档访问。
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
android:maxSdkVersion="28" />
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />
对于 Android 10,您将以下行放在 AndroidManifest.xml 标记中
android:requestLegacyExternalStorage="true"
下面的方法检查权限是被允许还是被拒绝
private boolean checkPermission() {
if (SDK_INT >= Build.VERSION_CODES.R) {
return Environment.isExternalStorageManager();
} else {
int result = ContextCompat.checkSelfPermission(PermissionActivity.this,READ_EXTERNAL_STORAGE);
int result1 = ContextCompat.checkSelfPermission(PermissionActivity.this,WRITE_EXTERNAL_STORAGE);
return result == PackageManager.PERMISSION_GRANTED && result1 == PackageManager.PERMISSION_GRANTED;
}
}
Android 11 及以下版本可使用以下方法请求权限
private void requestPermission() {
if (SDK_INT >= Build.VERSION_CODES.R) {
try {
Intent intent = new Intent(Settings.ACTION_MANAGE_APP_ALL_FILES_ACCESS_PERMISSION);
intent.addCategory("android.intent.category.DEFAULT");
intent.setData(Uri.parse(String.format("package:%s",getApplicationContext().getPackageName())));
startActivityForResult(intent,2296);
} catch (Exception e) {
Intent intent = new Intent();
intent.setAction(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION);
startActivityForResult(intent,2296);
}
} else {
//below android 11
ActivityCompat.requestPermissions(PermissionActivity.this,new String[]{WRITE_EXTERNAL_STORAGE},PERMISSION_REQUEST_CODE);
}
}
Android 11及以上版本处理权限回调
@Override
protected void onActivityResult(int requestCode,int resultCode,@Nullable Intent data) {
super.onActivityResult(requestCode,resultCode,data);
if (requestCode == 2296) {
if (SDK_INT >= Build.VERSION_CODES.R) {
if (Environment.isExternalStorageManager()) {
// perform action when allow permission success
} else {
Toast.makeText(this,"Allow permission for storage access!",Toast.LENGTH_SHORT).show();
}
}
}
}
处理 Android 11 以下操作系统版本的权限回调
@Override
public void onRequestPermissionsResult(int requestCode,String[] permissions,int[] grantResults) {
switch (requestCode) {
case PERMISSION_REQUEST_CODE:
if (grantResults.length > 0) {
boolean READ_EXTERNAL_STORAGE = grantResults[0] == PackageManager.PERMISSION_GRANTED;
boolean WRITE_EXTERNAL_STORAGE = grantResults[1] == PackageManager.PERMISSION_GRANTED;
if (READ_EXTERNAL_STORAGE && WRITE_EXTERNAL_STORAGE) {
// perform action when allow permission success
} else {
Toast.makeText(this,Toast.LENGTH_SHORT).show();
}
}
break;
}
}