rk3568 android 11 外部设备访问使用权限

功能:在开发播放/sdcard 下的视频文件，发现出现file not found 没有权限。

1.AndroidManifest.xml中添加权限

2.在onCreate()函数中调用权限申请

private String[] permissions = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE,Manifest.permission.MANAGE_EXTERNAL_STORAGE};
private static final int OPEN_SET_REQUEST_CODE = 100;

//调用此方法判断是否拥有权限
private void initPermissions() {
    if (lacksPermission(permissions)) {//判断是否拥有权限
        //请求权限，第二参数权限String数据，第三个参数是请求码便于在onRequestPermissionsResult 方法中根据code进行判断
        ActivityCompat.requestPermissions(this, permissions, OPEN_SET_REQUEST_CODE);
    }
}


//如果返回true表示缺少权限
public boolean lacksPermission(String[] permissions) {
    for (String permission : permissions) {
        //判断是否缺少权限，true=缺少权限
        if(ContextCompat.checkSelfPermission(getApplicationContext(), permission) != PackageManager.PERMISSION_GRANTED){
            return true;
        }
    }
    return false;
}

3.权限回调函数中执行

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    switch (requestCode){//响应Code
        case OPEN_SET_REQUEST_CODE:
            if (grantResults.length > 0) {
                for(int i = 0; i < grantResults.length; i++){
                    if(grantResults[i] != PackageManager.PERMISSION_GRANTED){
                        //Toast.makeText(this,"未拥有相应权限"+grantResults[i],Toast.LENGTH_LONG).show();
                        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
                            if (!Environment.isExternalStorageManager()) {
                                startActivityForResult(new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION), OPEN_SET_REQUEST_CODE);
                            }
                        }
                        return;
                    }
                }
            }
            break;
    }
}

4.Androdi 11需要调用获取权限

startActivityForResult(new Intent(Settings.ACTION_MANAGE_ALL_FILES_ACCESS_PERMISSION), OPEN_SET_REQUEST_CODE);