在 Android 的一个应用程序会话中获取位置和外部存储权限答案

【问题标题】：Getting location and external storage permissions in one application session in Android在 Android 的一个应用程序会话中获取位置和外部存储权限
【发布时间】：2021-08-01 03:01:48
【问题描述】：

我正在向我的应用程序添加 Location 和 ExternalWrite 权限。我希望用户能够在一个应用程序会话中获得这两种权限。目前，必须关闭并重新打开应用程序才能显示外部写入权限请求对话框。

MainActivity中的代码如下，

    public boolean checkExternalWritePermission() {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
            new AlertDialog.Builder(this)
                    .setTitle(R.string.title_externalwrite_permission)
                    .setMessage(R.string.text_externalwrite_permission)
                    .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            //Prompt the user once explanation has been shown
                            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, MY_PERMISSIONS_REQUEST_EXTERNAL_WRITE);
                        }
                    })
                    .create()
                    .show();
        } else {
        ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},MY_PERMISSIONS_REQUEST_EXTERNAL_WRITE);
        }
        return false;
    } else {
        return true;
    }
}

...和

public boolean checkLocationPermission() {
    if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
            new AlertDialog.Builder(this)
                    .setTitle(R.string.title_location_permission)
                    .setMessage(R.string.text_location_permission)
                    .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialogInterface, int i) {
                            ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_LOCATION);
                        }
                    })
                    .create()
                    .show();
        } else {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, MY_PERMISSIONS_REQUEST_LOCATION);
        }
        return false;
    } else {
        return true;
    }
}

但是，从 OnCreate 调用这些，

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
checkLocationPermission();
checkExternalWritePermission()  
}

在全新安装（或权限重置）后，只会调用 OnCreate 中的第一个函数。如果应用程序没有关闭并重新启动，则不会调用第二个。 问题：如何在一个应用程序会话中同时获得两种权限？提前致谢。

【问题讨论】：

合并这两个函数，使一个requestPermissions()调用所有权限。 requestPermissions() 接受String[]，您可以传递多个权限字符串。

标签： android android-permissions

【解决方案1】：

这行得通。

private boolean requestPermissions() {
    int iExtStorage = ContextCompat.checkSelfPermission(this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
    int iCoarseLocation = ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION);
    int iFineLocation = ContextCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION);
    List<String> listPermissionsNeeded = new ArrayList<>();

    if (iExtStorage != PackageManager.PERMISSION_GRANTED) {
        listPermissionsNeeded.add(android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
    }
    if (iFineLocation != PackageManager.PERMISSION_GRANTED) {
        listPermissionsNeeded.add(android.Manifest.permission.ACCESS_FINE_LOCATION);
    }
    if (iCoarseLocation != PackageManager.PERMISSION_GRANTED) {
        listPermissionsNeeded.add(android.Manifest.permission.ACCESS_COARSE_LOCATION);
    }
    if (!listPermissionsNeeded.isEmpty())
    {
        ActivityCompat.requestPermissions(this,listPermissionsNeeded.toArray
                (new String[listPermissionsNeeded.size()]),REQUEST_ID_MULTIPLE_PERMISSIONS);
        return false;
    }
    return true;
}

【讨论】：