小编Raj*_*dka的帖子

我有这个网络模块.我想在ErrorUtils的静态方法中注入网络模块.

@Module
public class NetworkModule {
    private final String END_POINT = "https://www.myurl.com/";

    @Provides
    @Singleton
    public OkHttpClient getOkHttpClient() {
            OkHttpClient okHttpClient = builder.build();
            return okHttpClient;
       }

    @Provides
    @Singleton
    public GsonConverterFactory getGsonConverterFactory() {
        return GsonConverterFactory.create();
    }

    @Provides
    @Singleton
    public Retrofit getRetrofit(OkHttpClient okHttpClient, GsonConverterFactory gsonConverterFactory) {
        return new Retrofit.Builder()
                .baseUrl(END_POINT)
                .client(okHttpClient)
                .addConverterFactory(gsonConverterFactory)
                .build();
    }

    @Provides
    @Singleton
    public RetrofitService getRetrofitService(Retrofit retrofit) {
        return retrofit.create(RetrofitService.class);
    }

我想在静态方法中注入此模块:

public class ErrorUtils {
    @Inject
    static Retrofit retrofit;

    public static RestError parseError(Response<?> response) {

        **//showing error while writing …

Android Studio版本3.2 beta 2和3.3 canary 2在使用时每次都会冻结.我曾尝试过以前的版本,除了很少的功能之外,它们曾经正常工作.

Android studio 3.2 canary 14没有渲染导航标签.它只是显示等待构建完成.

navigation_graph

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <fragment
        android:id="@+id/fragment_nav_host"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:navGraph="@navigation/navigation_graph" />
</navigation>

我已按照此链接刷新访问令牌.添加Authenticator到okHttp从okTttp3获取错误的unnexpected流结束从改造回调onFailure方法

public class TokenAuthenticator implements Authenticator {
    AccessTokenRefreshModel accessTokenRefreshModel = null;

    @Override
    public Request authenticate(Route route, Response response) throws IOException {
        Call<UserLogin> call = iService.refreshAccessToken(BuildConfig.CLIENT_ID, refreshToken);
        UserLogin userLogin = call.execute().body();
        // Add new header to rejected request and retry it
        return response.request().newBuilder()
                .header(AUTHORIZATION, userLogin.getAccessToken())
                .build();
    }
}


Call<User> call = iService.createuser(user);
call.enqueue(new Callback<User>() {
  @Override
  public void onResponse(Call<User> call, Response<User> response) {

  }

  @Override
  public void onFailure(Call<User> call, Throwable t) {
    //**Unexpected end of …

我正在使用JAVA EE,JAX-RS,JPA,GLASSFISH进行应用.对于MediaType.APPLICATION_XML,响应正常.它不适用于MediaType.APPLICATION_JSON.

这是我的pojo课程

@Entity
@XmlRootElement
public class Book {
    private int id;
    private String name;
    private String publication;
    private String price;

    @Id
    @Column(name = "id")
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Basic
    @Column(name = "name")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Basic
    @Column(name = "publication")
    public String getPublication() {
        return publication;
    }

    public void setPublication(String publication) …

我使用viewpager来显示每月的数据.我想更改折叠工具栏的标题,以便在viewpager的页面中更改.折叠工具栏标题仅在向上滚动工具栏时更改.

我的布局

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <android.support.v4.view.ViewPager
                android:id="@+id/view_pager"
                android:layout_width="match_parent"
                android:layout_height="@dimen/activity_history_view_pager_height" />
        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>

    <android.support.design.widget.AppBarLayout
        android:id="@+id/my_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="@dimen/activity_history_collapsing_toolbar_height"
            android:fitsSystemWindows="true"
            app:contentScrim="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar_flexible_space"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:background="?attr/colorPrimary"
                android:fitsSystemWindows="true"
                android:minHeight="?attr/actionBarSize"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                app:theme="@style/ThemeOverlay.AppCompat.Light" />
        </android.support.design.widget.CollapsingToolbarLayout>

        <TextView
            android:id="@+id/txt_year"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/activity_history_margin_left"
            android:layout_marginStart="@dimen/activity_history_margin_left"
            android:text="@string/activity_history_year"
            android:textColor="@color/white"
            android:textSize="@dimen/activity_history_text_size" />

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@dimen/activity_history_margin_bottom"
            android:orientation="vertical"
            app:layout_scrollFlags="scroll">

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentEnd="true"
                android:layout_alignParentRight="true"
                android:layout_marginEnd="@dimen/activity_history_margin_right"
                android:layout_marginRight="@dimen/activity_history_margin_right"
                android:orientation="horizontal">

                <ImageView
                    android:id="@+id/img_leftBackArrow"
                    android:layout_width="@dimen/activity_history_arrow_size"
                    android:layout_height="@dimen/activity_history_arrow_size"
                    android:contentDescription="@string/content_description"
                    android:src="@drawable/previous_arrow" />

                <ImageView
                    android:id="@+id/img_rightBackArrow"
                    android:layout_width="@dimen/activity_history_arrow_size" …

我的应用程序中有两种产品口味，即
flavorOne（src / flavorOne / java）和flavorTwo（src / flavorTwo / java）。Main（src / main / java）是目录形式，两种风格都使用这些类。我想开始活动的src / flavorTwo / JAVA / ActivityB的.java从活动中存在的src / main / JAVA / ActivityA。在运行flavourTwo时有效，但当我切换flavourOne时，它显示导入com.packagename.ActivityB错误。

+ App // module
    |- src
       |- main// shared srcDir
          |- java
           |- SharedActivity
       + flavorOne
          |- java
           |- FlavorOneActivity
       + flavorTwo
          |- java
           |- FlavorTwoActivity

这是dir src / main / java / SharedActivity.java中的SharedActivity.java

package com.example.buildvariants;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import …

在添加导航目录时显示错误无效的资源目录.

处理命令'〜/ Android/Sdk/builds-tools/27.0.3/aapt'以退出值1结束.

的build.gradle

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.crushcoder.testapp"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'android.arch.lifecycle:extensions:1.1.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

我在目录res/navigation/nav_graph.xml下创建了导航文件

错误

无法实例化片段 androidx.navigation.fragment.NavHostFragment：确保类名存在，是公共的，并且有一个公共的空构造函数。

活动布局

 <fragment
        android:id="@+id/my_nav_host_fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:name="androidx.navigation.fragment.NavHostFragment"
        app:defaultNavHost="true"
        app:navGraph="@navigation/app_nav" />

活动

class HomeActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_home)
    }
}

分段

class MovieListFragment : Fragment() {
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.fragment_movie_list, container, false)
    }
}

使用的依赖：

implementation('android.arch.navigation:navigation-fragment-ktx:1.0.0-alpha07') {
    exclude group: "com.android.support"
}
implementation('android.arch.navigation:navigation-ui-ktx:1.0.0-alpha07') {
    exclude group: "com.android.support"
}