迁移至AndroidX后ResolveDialogFragment的show方法无法解析求助

问题场景 #

运行他人开发的Android项目时，原依赖使用旧版support库：

implementation 'com.android.support:appcompat-v7:23.3.0'

收到IDE提示：

Version 28 (intended for Android Pie and below) is the last version of
the legacy support library, so we recommend that you migrate to
AndroidX libraries when using Android Q and moving forward. The IDE
can help with this: Refactor > Migrate to AndroidX...

手动替换为AndroidX依赖：

implementation 'androidx.appcompat:appcompat:1.3.1'

并在Java文件中更新导入：

import androidx.appcompat.app.AppCompatActivity;

之后出现编译错误：

"Cannot resolve method 'show' in 'ResolveDialogFragment'"

相关代码片段 #

MainActivity中调用Dialog的关键代码 #

Button resolveButton = findViewById(R.id.resolve_button);
resolveButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (cloudAnchor != null) {
            snackbarHelper.showMessageWithDismiss(getParent(), "Please clear anchor.");
            return;
        }
        ResolveDialogFragment dialog = new ResolveDialogFragment();
        dialog.setOkListener(MainActivity.this::onResolveOKPressed);
        dialog.show(getSupportFragmentManager(), "Resolve"); // 此处报错
    }
});

当前Gradle依赖 #

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'androidx.appcompat:appcompat:1.3.1'
    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.4.0'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    implementation 'com.google.android.material:material:1.0.0-alpha3'
    implementation 'com.google.firebase:firebase-database:20.2.0' 
    implementation "com.google.ar.sceneform.ux:sceneform-ux:1.4.0" 
}

解决方法 #

1. 修复ResolveDialogFragment的AndroidX适配 #

ResolveDialogFragment大概率继承了旧版support库的DialogFragment，需同步迁移到AndroidX：

• 打开ResolveDialogFragment类文件，将导入替换为：

  import androidx.fragment.app.DialogFragment;
  

• 确保类继承的是AndroidX版本的DialogFragment：

  public class ResolveDialogFragment extends DialogFragment {
      // ... 原有代码
  }
  

2. 完成全项目AndroidX迁移 #

手动替换依赖容易遗漏，建议使用IDE自动迁移工具：

1. 点击菜单栏的Refactor -> Migrate to AndroidX
2. 按照向导完成迁移，IDE会自动替换所有support库依赖、导入语句及相关代码

3. 补充AndroidX Fragment依赖（可选） #

如果迁移后仍有Fragment相关报错，可在Gradle中添加AndroidX Fragment依赖：

implementation 'androidx.fragment:fragment:1.4.1' // 版本可与appcompat匹配

内容的提问来源于stack exchange，提问作者rakshitha Poojary