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本文介紹了升級我的 Fragment 的導航版本時出現問題(從 2.3.5 到 2.4.0-alpha03)的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！

問題描述

我一直在嘗試將片段的導航版本從 2.3.5 升級到 2.4.0-alpha03，以便它可以根據文檔支持多個回棧https://developer.android.com/jetpack/androidx/releases/navigation

I have been trying to upgrade my fragment's navigation version from 2.3.5 to 2.4.0-alpha03 so that it can support multiple back stacks as per the documentation https://developer.android.com/jetpack/androidx/releases/navigation

并且還幫助保存和恢復我的每個底部導航項目的狀態幾天現在不成功.每次我在 build.gradle 中同步實現時，我的 homeactivity 中的代碼都會拋出此錯誤 cannot resolve symbol

and also help in saving and restoring the state of each of my bottom nav items for a few days now unsuccessfully. Each time I sync the implementations in my build.gradle, code in my homeactivity throws this error cannot resolve symbol

final NavController navController = navHostFragment.getNavController(); 
NavigationUI.setupWithNavController(bottomNavigationView, navController);
FirstFragment firstFragment = (FirstFragment) navHostFragment.getChildFragmentManager().getFragments().get(0);

以及他們的進口

import androidx.navigation.NavController;
import androidx.navigation.fragment.NavHostFragment;
import androidx.navigation.ui.NavigationUI;

也拋出錯誤未使用導入語句，無法解析符號.因此，如果我運行該應用程序，它就無法執行我希望它執行的上述功能.

throw an error too unused import statement, cannot resolve symbol. So if I run the app, it's unable to perform the above functions that I want it to.

這是我迄今為止嘗試過的:

Here's what i've tried so far:

我添加了這個實現androidx.navigation:navigation-fragment:2.4.0-alpha03"并實現androidx.navigation:navigation-ui:2.4.0-alpha03"到我的build.gradle(app).

I've added this implementation "androidx.navigation:navigation-fragment:2.4.0-alpha03" and implementation "androidx.navigation:navigation-ui:2.4.0-alpha03" to my build.gradle(app).

但它并沒有解決.

編輯

我的 Android Gradle 插件版本是 4.0.2

My Android Gradle Plugin version is 4.0.2

我的 Gradle 版本是 6.1.1

My Gradle Version is 6.1.1

我相信有些事情我沒有做對，或者我應該做的事情我沒有做.如果有人能指出這一點，我將不勝感激.

I believe there's something I didn't do right or something I'm meant to do that I didn't do. Please I'd appreciate it if anyone can identify that.

這是我的具體代碼:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 30
    buildToolsVersion "30.0.2"

    defaultConfig {
        applicationId "com.viz.lightweatherforecast"
        minSdkVersion 21
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        targetCompatibility JavaVersion.VERSION_1_8
        sourceCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation 'androidx.appcompat:appcompat:1.3.0'
    implementation 'com.google.android.material:material:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    implementation 'com.squareup.retrofit2:retrofit:2.9.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
    implementation "androidx.navigation:navigation-fragment:2.4.0-alpha03"
    implementation "androidx.navigation:navigation-ui:2.4.0-alpha03"
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'androidx.media2:media2:1.0.0-alpha04'
    implementation 'org.jetbrains:annotations:15.0'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

}

Build.gradle(項目):

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.0.2"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

HomeActivity.java:

package com.viz.lightweatherforecast.Activity;

import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.navigation.NavController;
import androidx.navigation.fragment.NavHostFragment;
import androidx.navigation.ui.NavigationUI;

import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.viz.lightweatherforecast.FirstFragment;
import com.viz.lightweatherforecast.R;
import com.viz.lightweatherforecast.Retrofit.ApiClient;
import com.viz.lightweatherforecast.Retrofit.ApiInterface;
import com.viz.lightweatherforecast.Retrofit.Example;

import org.jetbrains.annotations.NotNull;

import java.util.Timer;
import java.util.TimerTask;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class HomeActivity extends AppCompatActivity {
    // Last update time, click sound, search button, search panel.
    TextView time_field;
    MediaPlayer player;
    ImageView Search;
    EditText textfield;
    // For scheduling background image change(using constraint layout, start counting from dubai, down to statue of liberty.
    ConstraintLayout constraintLayout;
    public static int count=0;
    int[] drawable =new int[]{R.drawable.dubai,R.drawable.central_bank_of_nigeria,R.drawable.eiffel_tower,R.drawable.hong_kong,R.drawable.statue_of_liberty};
    Timer _t;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        // use home activity layout.

        time_field = findViewById(R.id.textView9);
        Search = findViewById(R.id.imageView4);
        textfield = findViewById(R.id.textfield);
        //  find the id's of specific variables.

        BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);
        // host 3 fragments along with bottom navigation.
        final NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.fragment);
        assert navHostFragment != null;
        final NavController navController = navHostFragment.getNavController();
        NavigationUI.setupWithNavController(bottomNavigationView, navController);


        // For scheduling background image change
        constraintLayout = findViewById(R.id.layout);
        constraintLayout.setBackgroundResource(R.drawable.dubai);
        _t = new Timer();
        _t.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                // run on ui thread
                runOnUiThread(() -> {
                    if (count < drawable.length) {

                        constraintLayout.setBackgroundResource(drawable[count]);
                        count = (count + 1) % drawable.length;
                    }
                });
            }
        }, 5000, 5000);

        Search.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                // make click sound when search button is clicked.
                player = MediaPlayer.create(HomeActivity.this, R.raw.click);
                player.start();

                getWeatherData(textfield.getText().toString().trim());
                // make use of some fragment's data
                FirstFragment firstFragment = (FirstFragment) navHostFragment.getChildFragmentManager().getFragments().get(0);
                firstFragment.getWeatherData(textfield.getText().toString().trim());

            }

            private void getWeatherData(String name) {

                ApiInterface apiInterface = ApiClient.getClient().create(ApiInterface.class);

                Call<Example> call = apiInterface.getWeatherData(name);

                call.enqueue(new Callback<Example>() {
                    @Override
                    public void onResponse(@NonNull Call<Example> call, @NonNull Response<Example> response) {

                        try {
                            assert response.body() != null;
                            time_field.setVisibility(View.VISIBLE);
                            time_field.setText("Last Updated:" + " " + response.body().getDt());
                        } catch (Exception e) {
                            time_field.setVisibility(View.GONE);
                            time_field.setText("Last Updated: Unknown");
                            Log.e("TAG", "No City found");
                            Toast.makeText(HomeActivity.this, "No City found", Toast.LENGTH_SHORT).show();
                        }
                    }

                    @Override
                    public void onFailure(@NotNull Call<Example> call, @NotNull Throwable t) {
                        t.printStackTrace();
                    }

                });
            }

        });
    }
}

Activity_home.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/layout"
    android:background="@drawable/dubai"
    tools:context=".Activity.HomeActivity">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/bottomNavigationView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="#FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:menu="@menu/bottom_menu" />

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="409dp"
        android:layout_height="599dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:navGraph="@navigation/my_nav"
        />

    <EditText
        android:id="@+id/textfield"
        android:layout_width="250dp"
        android:layout_height="35dp"
        android:autofillHints="@string/change_city"
        android:background="@color/colorPrimary"
        android:hint="@string/search_city"
        android:inputType="text"
        android:labelFor="@id/imageView4"
        android:padding="8dp"
        android:textColor="@color/colorAccent"
        android:textSize="16sp"
        app:layout_constraintEnd_toStartOf="@+id/imageView4"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/imageView4"
        android:layout_width="50dp"
        android:layout_height="35dp"
        android:layout_marginEnd="1dp"
        android:contentDescription="@string/searchbtn"
        android:src="@drawable/look"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/time_field"
        android:visibility="gone"
        android:textColor="#FFFFFF"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textfield" />


</androidx.constraintlayout.widget.ConstraintLayout>

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升級我的 Fragment 的導航版本時出現問題(從 2.3.

問題描述

Build.gradle(項目):

HomeActivity.java:

Activity_home.xml:

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