无法解析的方法placeholderfragment错误 [英] Cannot resolve method placeholderfragment error

问题描述

我真的卡在这个错误（下）：

I'm really stuck on this error (below):

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

      if (savedInstanceState == null) {
          getFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }
}

我有正确引用到XML布局的容器（下）：

I have the container referenced correctly to XML layout (below):

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/container"
    tools:context="com.customerautomotivenetwork.VehicleRecall"/>

不过，我不断收到一个错误无法解决方法PlacehlderFragment，是我做错了什么想法？

But I keep getting an error of cannot resolve method for PlacehlderFragment, any idea of what I'm doing wrong?

推荐答案

• 您可能延长错版片段

在文件 PlaceholderFragment.java ，首先要确保你延长片段：

In your file PlaceholderFragment.java, first make sure you extend Fragment:

public class PlaceholderFragment extends Fragment { //...

然后，检查进口在该文件的开头。应该有一行：

Then, check the imports at the beginning of that file. There should be the line:

import android.app.Fragment;

和不会的行：

import android.support.v4.app.Fragment;

尽量不要混用正常和V4片段，它们具有相同的名字，做同样的事情，但它们实际上是不同的类。

Try not to mix "normal" and "v4" Fragments, they have the same name and do the same things but they are actually different classes.

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