Question

我试图使用Fragements。但是在MainActivity.java文件中，transaction.add(R.id.my_layout, testfrag, "");未正确启动。请在我使用的代码下面找到。

package com.example.testtabs;

import android.os.Bundle;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.app.TabActivity;
import android.view.Menu;
import android.widget.TabHost;
import android.support.v4.app.Fragment;
import com.example.testtabs.R;



public class MainActivity extends TabActivity {


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

         FragementTest testfrag=new FragementTest();
        FragmentManager manager=getFragmentManager();
        FragmentTransaction transaction=manager.beginTransaction();
        transaction.add(R.id.my_layout, testfrag, "");//Error is here

    }
}

activity_main.xml：

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" 
    android:id="@+id/my_layout"
  >

Error: The method add(int, Fragment, String) in the type FragmentTransaction is not applicable for the arguments (int, FragementTest, String)

Fragement.test

package com.example.testtabs;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * A simple {@link android.support.v4.app.Fragment} subclass.
 * 
 */
public class FragementTest extends Fragment {

    public FragementTest() {
        // Required empty public constructor
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_fragement, container, false);
    }

}

Answer 1

变化：

import android.app.FragmentManager;
import android.app.FragmentTransaction;

为：

import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;

或---

变化：

import android.support.v4.app.Fragment;

到

import android.app.Fragment;

Answer 2

所有片段应该是android.app.Fragment。如果你想使用android.support.v4.app.Fragment，你应该使用etSupportFragmentManager（）来获取管理器。

Answer 3

它为我工作：

使用getSupportFragmentManager（）;

而不是使用getFragmentManager

错误：FragmentTransaction类型中的方法add（int，Fragment，String）不适用于参数（int，FragementTest，String）

3 个答案: