无法从 android.app.FragmentManager 转换为 android.support.v4.app.FragmentManager [英] cannot convert from android.app.FragmentManager to android.support.v4.app.FragmentManager

问题描述

我正在使用 Fragments 为平板电脑创建一个应用程序.到目前为止，我已经在左侧创建了一些按钮，并且在单击按钮时会出现这些片段.

I am creating an app using Fragments for tablet.I have so far created some buttons on the left side and the fragments appear on clicking the buttons.

但我在 MainActivity.java 文件中遇到错误类型不匹配错误:无法从 android.app.FragmentManager 转换为 android.support.v4.app.FragmentManager" 这就是我无法实现它的主要原因.我已经导入了android.support.v4.app.FragmentManager.

But i am experiencing error in my MainActivity.java file "Type mismatch error:cannot convert from android.app.FragmentManager to android.support.v4.app.FragmentManager" And that is the main reason that i cannot implement it.I have already imported android.support.v4.app.FragmentManager.

我该如何解决我的问题?

How can i resolve my problem?

我的 MainActivity.java 代码

My code for MainActivity.java

      import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
    Fragment fragment;
    Button btn1,btn2,btn3,btn4,btn5,btn6;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn1=(Button)findViewById(R.id.btn1);
        btn2=(Button)findViewById(R.id.btn2);
        btn3=(Button)findViewById(R.id.btn3);
        btn4=(Button)findViewById(R.id.btn4);
        btn5=(Button)findViewById(R.id.btn5);
        btn6=(Button)findViewById(R.id.btn6);

        FragmentManager fm=getFragmentManager();
        FragmentTransaction ft=fm.beginTransaction();

        StartFragment myfragment=new StartFragment();
        ft.add(R.id.myfragment,myfragment);
        ft.commit();
        btn4.setOnClickListener(btnOnClickListener);
        btn5.setOnClickListener(btnOnClickListener);
        btn6.setOnClickListener(btnOnClickListener);
    }



        Button.OnClickListener btnOnClickListener=new Button.OnClickListener(){
            @Override

            public void onClick(View v)
            {
                Fragment newfragment;
                if(v==btn1)
                {
                    newfragment=new Fragment1();
                }
                else if(v==btn2)
                {
                    newfragment=new Fragment2();
                }
                else if(v==btn3)
                {
                    newfragment=new Fragment3();
                }
                else if(v==btn4)
                {
                    newfragment=new Fragment4();
                }
                else if(v==btn5)
                {
                    newfragment=new Fragment5();
                }
                else if(v==btn6)
                {
                    newfragment=new Fragment6();
                }
                else 
                {
                    newfragment=new StartFragment();
                }
                FragmentTransaction transaction=getFragmentManager.beginTransaction();
                transaction.replace(R.id.myfragment,newfragment);
                transaction.addToBackStack(null);
                transaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
                transaction.commit();
            }
        };
        }

推荐答案

您需要在代码中使用 getSupportFragmentManager()，而不是 getFragmentManager() - 见 此处了解更多详情.

You need to use getSupportFragmentManager() in your code, not getFragmentManager() - see here for more details.

你还需要从 android.support.v4.app.FragmentActivity 扩展你的类，而不仅仅是从标准的 android.Activity 来获取这个方法.

You also need to extend your class from android.support.v4.app.FragmentActivity, not just from standard android.Activity to get this method.

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