android - 运行时权限 - 为已授予的权限请求权限

Question

我编写了以下脚本来获取联系人和位置的多个运行时权限。我在布局中分别为联系人和位置使用了两个开关。如果我单击联系人开关，它会按预期请求对联系人和位置的许可。然后我从“应用程序权限”设置 Activity 中手动删除了位置权限。现在，如果我点击位置开关，它会再次询问联系人和位置。

我的问题是，既然我第一次授予了联系人权限，我可以在“应用程序权限”设置 Activity 中看到权限被授予，为什么又要请求联系人权限？即使我在 hasPermissions 方法中检查它。

public static final int REQUEST_ID_MULTIPLE_PERMISSIONS = 1001;
String[] PERMISSIONS = {Manifest.permission.READ_CONTACTS, Manifest.permission.WRITE_CONTACTS,
        Manifest.permission.ACCESS_FINE_LOCATION, Manifest.permission.ACCESS_COARSE_LOCATION};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.basic_permissions);
    CONTACTS_ACCESS_SWITCH = (Switch) findViewById(R.id.contactsPermissionSwitch);
    LOCATION_ACCESS_SWITCH = (Switch) findViewById(R.id.locationPermissionSwitch);
    CONTACTS_ACCESS_SWITCH.setOnClickListener(requestPermissionMethod);
    LOCATION_ACCESS_SWITCH.setOnClickListener(requestPermissionMethod);
}

private void requestPermissionMethod() {
    if (!hasPermissions(BasicPermissions.this, PERMISSIONS)) {
        ActivityCompat.requestPermissions(BasicPermissions.this, PERMISSIONS, REQUEST_ID_MULTIPLE_PERMISSIONS);
    }
}

private boolean hasPermissions(Context context, String... permissions) {
    if (context != null && permissions != null) {
        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(BasicPermissions.this, permission) != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
    }
    return true;
}

list 文件:

<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_CONTACTS"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

配置:

在 Android 6.0 android studio 模拟器设备上测试。

compileSdkVersion 27.

minSdkVersion 18

targetSdkVersion 27

Answer 1

由于代码是使用 Array 编写的，它请求对数组中所有值的权限，即使它已经被授予。所以我重写了代码以使用 ArrayList 而不是 Array。现在它按预期完美运行。

private  boolean requestPermissionMethod() {
    int permissionContacts = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS);
    int locationPermission = ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION);
    List<String> listPermissionsNeeded = new ArrayList<>();
    if (locationPermission != PackageManager.PERMISSION_GRANTED) {
        listPermissionsNeeded.add(Manifest.permission.ACCESS_FINE_LOCATION);
    }
    if (permissionContacts != PackageManager.PERMISSION_GRANTED) {
        listPermissionsNeeded.add(Manifest.permission.READ_CONTACTS);
    }
    if (!listPermissionsNeeded.isEmpty()) {
        ActivityCompat.requestPermissions(this, listPermissionsNeeded.toArray(new String[listPermissionsNeeded.size()]),REQUEST_ID_MULTIPLE_PERMISSIONS);
        return false;
    }
    return true;
}