Getting only once permission for sdcard window on Lollipop and above version

问题

Hello I am deleting some items from SD card. And in lollipop first time i ask for permission and user grant permission, but now i don't want to ask every time for permission. Its very irritating and many of guys they afraid from this behavior. How can i save my permission i.e. next time i don't need to pass that Intent again and again

Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);

Thank you

回答1:

I give you some code to example. Remember that u need check permission on Android 6.0. OnRequestPermission is method that when u have permission will be do code in grantResult, if not u can ask for permission or saying message that user not give a permission. And this method save status for permission

@TargetApi(23)
public void checkStoragePermission() {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
        if (settingsDrawerFragment != null) {
            settingsDrawerFragment.onPermissionGranted();
        }
        return;
    }
    if (this.checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager
            .PERMISSION_GRANTED) {
        requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                REQUEST_CODE_EXTERNAL_STORAGE);
        return;
    }
    if (settingsDrawerFragment != null) {
        settingsDrawerFragment.onPermissionGranted();
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[]
        grantResults) {
    switch (requestCode) {
        case REQUEST_CODE_AUDIO_RECORD:
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                startBrowseActivity();
            } else {
                Utils.showToast(this, getString(R.string.audio_permission_denied));
            }
            break;
        case REQUEST_CODE_EXTERNAL_STORAGE:
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                if (settingsDrawerFragment != null) {
                    settingsDrawerFragment.onPermissionGranted();
                }
            } else {
                if (settingsDrawerFragment != null) {
                    closeSettingsDrawer();
                }
                Utils.showToast(this, getString(R.string.storage_permission_denied));
            }
            break;
        default:
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
            break;
    }
}

回答2:

You can use the following code to persist permission

 getContentResolver().takePersistableUriPermission(treeUri,
            Intent.FLAG_GRANT_READ_URI_PERMISSION |
            Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

Also once you persist permission save the uri in a sharedPreference so that you can delete files later without confirmation.

回答3:

You can launch your intent by adding falgs.

 Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
 intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION |
                        Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
 startActivity(intent);

来源：https://stackoverflow.com/questions/39199123/getting-only-once-permission-for-sdcard-window-on-lollipop-and-above-version