小编Gow*_*n M的帖子

当按返回按钮时，我的片段正在更改为主页，但底部图标没有更改。我在这里发布了所有代码。如果我从底部导航视图项目中选择了两个以上的导航按钮，则当我按“后退”按钮时，它将重定向到上一个选定的按钮项目。

但是现在发生的是，假设我在最后一个项目上说“通知”（如屏幕截图所示），现在当我按“后退”按钮时，它将直接带我到“主页”按钮，但是我想要的是应该先带我到“搜索”按钮项，然后到“主页”，而不是直接到“主页”。

我怎样才能做到这一点？

这是布局：

 <?xml version="1.0" encoding="utf-8"?>
            <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                xmlns:design="http://schemas.android.com/apk/res-auto"
                android:id="@+id/activity_main"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical"
                tools:context="com.segunfamisa.sample.bottomnav.MainActivity">

                <FrameLayout
                    android:id="@+id/container"
                    android:layout_width="match_parent"
                    android:layout_height="0dp"
                    android:layout_weight="1"
                    android:background="#f1f1f1">

                </FrameLayout>

                <android.support.design.widget.BottomNavigationView
                    android:id="@+id/navigation"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_gravity="start"
                    design:menu="@menu/bottom_nav_items" />
            </LinearLayout>

这是活动：

    public class MainActivity extends AppCompatActivity {
    private static final String SELECTED_ITEM = "arg_selected_item";

    private BottomNavigationView mBottomNav;
    private int mSelectedItem;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mBottomNav = (BottomNavigationView) findViewById(R.id.navigation);
        mBottomNav.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                selectFragment(item);
                return true;
            }
        });

        MenuItem selectedItem; …

我从中删除了一些gradle链接，build.gradle(app)但删除的库仍然显示在外部库文件夹中。

我有多个文档。我的问题是我无法获取修改的特定数据，我正在获取完整的文档。

 db.collection("employees").whereEqualTo("OID", OID)
                    .addSnapshotListener(new EventListener<QuerySnapshot>() {
                        @Override
                        public void onEvent(@Nullable QuerySnapshot queryDocumentSnapshots, @Nullable FirebaseFirestoreException e) {

                if (e != null) {
                    Log.w(TAG, "listen:error", e);
                    return;
                }

                for (DocumentChange dc : snapshots.getDocumentChanges()) {
                    switch (dc.getType()) {
                        case ADDED:
                             //Here i am getting full newly added documents
                            break;
                        case MODIFIED:
                           //here i am getting which is modified document,ok fine...,But i want to get only the filed which i modified instance of getting full documents..
                            break;
                        case REMOVED:

                            break;
                    }
                }

            }
        }); …

我有一个充满自定义视图的应用程序.当我尝试以编程方式创建FAB时,它会抛出错误

引起:java.lang.IllegalArgumentException:您需要将Theme.AppCompat主题(或后代)与设计库一起使用.

这是我的代码.

private FloatingActionButton getFAB() {
    FloatingActionButton fab = new FloatingActionButton(getContext());
    fab.setBackgroundDrawable(ContextCompat.getDrawable(getContext(), R.drawable.ic_add_white_24dp));
    return fab;
}

这是我的应用主题.

    <!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
</style>

请帮我.

我有一张桌子如下

date1   |  date2  | datechoice

1-5-17    2-6-17      date2

Datechoice可以是date1或date2.我想首先查看datechoice列,以确定在where语句中使用哪个列.

示例伪代码:

CASE WHEN datechoice ='date2' 
     THEN where date2 >= 2-2-17 AND where date2 <= 2-9-17 
     ELSE where date1 >= 2-2-17 AND where date1 <= 2-9-17

我怎样才能做到这一点？

我想将Base64字符串转换为 png 格式的ImageView. 我现在正在使用：

byte[] decodedString = Base64.decode(imageString, Base64.DEFAULT);
    Bitmap bmp = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
    imageView.setImageBitmap(bmp);

它工作完美，但我想要一个 png 图像。谢谢。

我想从坐标中获取地址。我在下面附上了我的代码..

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let lastLocation = locations.last!
    let latvalue     = lastLocation.coordinate.latitude
    let lngvalue     = lastLocation.coordinate.longitude
    self.db_latvalue = latvalue
    self.db_lngvalue = lngvalue
    let location = CLLocation(latitude: latvalue, longitude:lngvalue)
    let address = CLGeocoder.init()
    address.reverseGeocodeLocation(CLLocation.init(latitude: latvalue, longitude:lngvalue)) { (places, error) in
        if error == nil{
            if let place = places{
                   print("addressshowingssq \(place)")
                self.db_address = "\(place)"

            }
        }
    }

输出：

[L-30 2nd A Main Road, L-30 2nd A Main Road, HSR Layout, Bengaluru, Karnataka 560102, India @ <+12.91597974,+77.62879254> …

注意: ImageView Click事件在Android中可用,我想知道它是否在iOS中可用

我是iOS新手,请考虑,我有相机图像,OnClick它我必须打开我的设备相机,但我正在获取Action的图像功能.附上截图

我的代码:

import UIKit

class AttendanceViewController: UIViewController {

    @IBOutlet weak var loginimagebtn: UIImageView!
    @IBOutlet weak var loginstatus: UITextView!
    @IBOutlet weak var displayloginimg: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    func openCamer() {


    if UIImagePickerController.isSourceTypeAvailable(
        UIImagePickerControllerSourceType.camera) {

        let imagePicker = UIImagePickerController()
        imagePicker.delegate = self
        imagePicker.sourceType = UIImagePickerControllerSourceType.camera
        imagePicker.allowsEditing = false
        self.present(imagePicker,animated: true,completion : nil)
    }

}

    // For Toast message below code
    func showToast(message : String) {
        let toastLabel = UILabel(frame: CGRect(x: self.view.frame.size.width/2 - 75, y: self.view.frame.size.height-100, width: …

为什么我不能像这样使用@DELETE参数@Url

@DELETE
Call<ServerResponse> deleteAbsence(@Path("id") int absenceId , @Url String url);

Url passed ="././deleteAbsence/{id}"

堆栈跟踪

 java.lang.IllegalArgumentException: @Path can only be used with relative url on @DELETE (parameter #2)
                                                                        for method WebApiInterface.deleteAbsence
                                                                        at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:752)
                                                                        at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:743)
                                                                        at retrofit2.ServiceMethod$Builder.parameterError(ServiceMethod.java:761)
                                                                        at retrofit2.ServiceMethod$Builder.parseParameterAnnotation(ServiceMethod.java:393)
                                                                        at retrofit2.ServiceMethod$Builder.parseParameter(ServiceMethod.java:336)
                                                                        at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:204)
                                                                        at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:170)
                                                                        at retrofit2.Retrofit$1.invoke(Retrofit.java:147)