我在我的应用程序中有两个权限，它们基于访问相机和外部存储，但我面临的问题是应用程序启动时只询问相机权限，不要求其他许可。

但在第二阶段，当我运行应用程序时，它要求第二次许可。

public class MainActivity extends AppCompatActivity {

private DrawerLayout mDrawer;
private Toolbar toolbar;
private NavigationView nvDrawer;
private ActionBarDrawerToggle drawerToggle;

private static final int REQUEST_CAMERA = 0;
private static final int REQUEST_EXTERNAL_STORAGE = 1;

private static String[] PERMISSION_EXTERNAL = {Manifest.permission.WRITE_EXTERNAL_STORAGE,
        Manifest.permission.READ_EXTERNAL_STORAGE};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if (ContextCompat.checkSelfPermission(this,
            Manifest.permission.CAMERA) !=
            PackageManager.PERMISSION_GRANTED) {

        if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                Manifest.permission.CAMERA)) {
            // Show an explanation 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.

        } else {
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);
        }
    } else if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED
            || ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
            != PackageManager.PERMISSION_GRANTED) {
        if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
                || ActivityCompat.shouldShowRequestPermissionRationale(this,
                Manifest.permission.READ_EXTERNAL_STORAGE)) {
            // Show an explanation 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.
        } else {
            ActivityCompat.requestPermissions(MainActivity.this,
                    PERMISSION_EXTERNAL, REQUEST_EXTERNAL_STORAGE);
        }
    }

    setContentView(R.layout.activity_main);
    toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    nvDrawer = (NavigationView) findViewById(R.id.nvView);
    mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    setupDrawerContent(nvDrawer);
    drawerToggle = setupDrawerToggle();
    mDrawer.addDrawerListener(drawerToggle);
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    if (requestCode == REQUEST_CAMERA) {
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            //granted
        } else {
            ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);
        }
    } else if (requestCode != REQUEST_EXTERNAL_STORAGE) {
        if (PermissionUtil.verifyPermission(grantResults)) {
            //Has been granted
        } else {
            //Not granted for permission
        }
    } else {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

private ActionBarDrawerToggle setupDrawerToggle() {
    return new ActionBarDrawerToggle(this, mDrawer, toolbar, R.string.drawer_open, R.string.drawer_close);
}

private void setupDrawerContent(NavigationView navigationView) {
    navigationView.setNavigationItemSelectedListener(
            new NavigationView.OnNavigationItemSelectedListener() {
                @Override
                public boolean onNavigationItemSelected(MenuItem menuItem) {
                    selectDrawerItem(menuItem);
                    return true;
                }
            });
}

private void selectDrawerItem(MenuItem menuItem) {
}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    drawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    drawerToggle.onConfigurationChanged(newConfig);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (drawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

Utils 类，用于检查 android 上的多个权限以获取 READ 和 WRITE EXTERNAL PERMISSION

public abstract class PermissionUtil {

public static boolean verifyPermission(int[] grantResults){
    // At least one result must be checked.
    if (grantResults.length > 0){
        return false;
    }

    for (int results :grantResults){
        if (results != PackageManager.PERMISSION_GRANTED){
            return false;
        }
    }
    return true;
}

即使我已经为 list 中的所有内容提供了权限。

最佳答案

您可以将多个权限添加到列表中。

检查多个权限的方法

public static final int REQUEST_ID_MULTIPLE_PERMISSIONS = 101;

public static boolean checkAndRequestPermissions(final Activity context) {
    int ExtstorePermission = ContextCompat.checkSelfPermission(context,
            Manifest.permission.READ_EXTERNAL_STORAGE);
    int cameraPermission = ContextCompat.checkSelfPermission(context,
            Manifest.permission.CAMERA);
    List<String> listPermissionsNeeded = new ArrayList<>();
    if (cameraPermission != PackageManager.PERMISSION_GRANTED) {
        listPermissionsNeeded.add(Manifest.permission.CAMERA);
    }
    if (WExtstorePermission != PackageManager.PERMISSION_GRANTED) {
        listPermissionsNeeded
                .add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
    }
    if (!listPermissionsNeeded.isEmpty()) {
        ActivityCompat.requestPermissions(context, listPermissionsNeeded
                .toArray(new String[listPermissionsNeeded.size()]),
                REQUEST_ID_MULTIPLE_PERMISSIONS);
        return false;
    }
    return true;
}

像这样使用它，

if(checkAndRequestPermissions(MainActivity.this)){
    doWork();
}

并像这样处理 PermissionsResult，

@Override
public void onRequestPermissionsResult(int requestCode,String[] permissions, int[] grantResults) {
    switch (requestCode) {
        case Utility.REQUEST_ID_MULTIPLE_PERMISSIONS:
            if (ContextCompat.checkSelfPermission(MainActivity.this,
                    Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(getApplicationContext(),
                        "FlagUp Requires Access to Camara.", Toast.LENGTH_SHORT)
                        .show();
                finish();
            } else if (ContextCompat.checkSelfPermission(Splash_Activity.this,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(getApplicationContext(),
                        "FlagUp Requires Access to Your Storage.",
                        Toast.LENGTH_SHORT).show();
                finish();
            } else {
                doWork();
            }
            break;
    }
}

快乐编码..

关于android - 我应该如何为相机和外部存储添加 android 权限，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42109719/