Question

我有以下代码在活动的READ_EXT_STORAGE中请求onCreate()权限：

if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                    Manifest.permission.READ_EXTERNAL_STORAGE)) {
                // Show an expanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.
                AlertDialog.Builder adb = new AlertDialog.Builder(this);
                adb.setMessage("This app needs to read your External Storage/Gallery to provide the images and the music you're going to use in the video.").setPositiveButton("OK", null).create();
                adb.show();
            } else {

                // No explanation needed, we can request the permission.

                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                        MY_PERMISSIONS_REQUEST_READ_EXT_STORAGE);

                // MY_PERMISSIONS_REQUEST_READ_CONTACTS is an
                // app-defined int constant. The callback method gets the
                // result of the request.
            }
        }
        else
        {
            onCreateActual();
        }
    }

onCreateActual()包含要在onCreate()中执行的实际代码。它包括动态设置片段。

onStartActual()涉及阅读外部存储空间以获取相册名称，并将它们放入片段中的ListView中。

这就是我的onRequestPermissionsResult()：

private int MY_PERMISSIONS_REQUEST_READ_EXT_STORAGE = 102;

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        Log.i("perms", permissions.length+"");
        int indexOfReadStorage = 0;
        for(int i = 0 ; i < permissions.length; i++)
        {
            Log.i("perms_len", permissions[i]);
            if(permissions[i].contains("READ_EXTERNAL_STORAGE"))
            {
                indexOfReadStorage = i;
            }
        }
        if (grantResults.length > 0 && grantResults[indexOfReadStorage] == PackageManager.PERMISSION_GRANTED) {
            // Permission Granted
            Log.i("read_ext_storage_perm", "granted");
            onCreateActual();
        } else {
            // Permission Denied
            Toast.makeText(this, "READ_EXT_STORAGE Denied", Toast.LENGTH_SHORT)
                    .show();
        }
    }
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}

我的问题是我有一个要求READ_EXTERNAL_STORAGE权限的广告库，如果我在此之前而不是在else子句中放置onCreateActual()，则库首先要求该权限，{{1上面不会被调用。

但是，如果我这样做，onRequestPermissionsResult()让我知道：

java.lang.IllegalStateException：onSaveInstanceState之后无法执行此操作

所以，除非有更好的方法，否则我认为我必须以某种方式停止活动的生命周期，直到授予READ_EXTERNAL_STORAGE权限。

是否可以延迟活动的生命周期，直到变量变化为止？如果没有，我可以刷新片段吗？

Answer 1

我认为你应该尝试Ask它运作良好并取出大部分的hastle

只需编译依赖

compile 'com.vistrav:ask:2.1'

这是完整的例子

public class MainActivity extends AppCompatActivity {

private static final String TAG = MainActivity.class.getSimpleName();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Ask.on(this)
            .forPermissions(Manifest.permission.ACCESS_COARSE_LOCATION
                    , Manifest.permission.WRITE_EXTERNAL_STORAGE)
            .withRationales("Location permission need for map to work properly",
                    "In order to save file you will need to grant storage permission") //optional
            .go();
}

//optional
@AskGranted(Manifest.permission.WRITE_EXTERNAL_STORAGE)
public void fileAccessGranted() {
    Log.i(TAG, "FILE  GRANTED");
}

//optional
@AskDenied(Manifest.permission.WRITE_EXTERNAL_STORAGE)
public void fileAccessDenied() {
    Log.i(TAG, "FILE  DENiED");
}

//optional
@AskGranted(Manifest.permission.ACCESS_COARSE_LOCATION)
public void mapAccessGranted() {
    Log.i(TAG, "MAP GRANTED");
}

//optional
@AskDenied(Manifest.permission.ACCESS_COARSE_LOCATION)
public void mapAccessDenied() {
    Log.i(TAG, "MAP DENIED");
}
}

您可以找到更多详情here

希望有所帮助

Android权限 - 关于权限请求冲突

1 个答案: