getSupportFragmentManager().getFragments()显示编译时错误

Question

调用getSupportFragmentManager().getFragments()显示编译时错误,并显示以下消息:

getSupportFragmentManager().getFragments()只能在同一个库组中调用(groupId = com.android.support)

我已导入以下类MainActivity:

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MenuItem;
import android.widget.Toast;

MainActivity延伸AppCompatActivity.

我的项目模块级build.gradle文件如下:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "com.mycompany.floatingdemo"
        minSdkVersion 16
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        vectorDrawables.useSupportLibrary = true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.2.0'
    compile 'com.android.support:design:25.2.0'
    compile 'com.android.support:support-vector-drawable:25.2.0'
    testCompile 'junit:junit:4.12'
}

这是getFragments里面方法的源代码FragmentManager.java.

/**
 * Get a list of all fragments that have been added to the fragment manager.
 *
 * @return The list of all fragments or null if none.
 * @hide
 */
@RestrictTo(LIBRARY_GROUP)
public abstract List<Fragment> getFragments();

我最近将我的Android Studio更新到最新的稳定版本(2.3)并更新了Android Gradle插件.我认为这可能是相关的,因为我之前没有看到过这个错误.

Answer 1

如FragmentManager文档中所述,getFragments()不是应用程序可用的公共方法,而是支持库的内部实现细节,因此使用添加的RestrictTo注释来防止使用私有API.

您需要将代码更改为不使用,getFragments并且仅使用公共API.

Answer 2

替代对于那些可能getFragments()在编码中使用的人,我已经替换了我的代码以获取backstack此代码的最后一个片段(我使用此代码onBackPressed()根据currentFragment假设所有片段都添加到backstack 来应用更改):

FragmentManager.BackStackEntry backStackEntryAt = getSupportFragmentManager().getBackStackEntryAt(getSupportFragmentManager().getBackStackEntryCount() - 1);
currentFragment = backStackEntryAt.getName();