錯誤：The method replace(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, MyFragment)

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Fragment newfragment =new MyFragment();
fragmentTransaction.replace(R.layout.activity_main,newfragment ).commit();

提示錯誤：The method replace(int, Fragment) in the type FragmentTransaction is not applicable for the arguments (int, MyFragment)

媽蛋，找了好久！一直以為子類對象不能賦值給父類引用。這部科學啊！

錯誤碼：

package com.example.testforfragment;import android.os.Bundle;import android.app.Activity;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.support.v4.app.Fragment;import android.support.v4.app.Fragment.*;import android.view.Menu;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        FragmentManager fragmentManager = getFragmentManager();        FragmentTransaction  fragmentTransaction = fragmentManager.beginTransaction();        Fragment newfragment =new MyFragment();        fragmentTransaction.replace(R.layout.activity_main,newfragment ).commit();    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

修改：

package com.example.testforfragment;import android.os.Bundle;import android.app.Activity;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.view.Menu;public class MainActivity extends FragmentActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        FragmentManager fragmentManager = getSupportFragmentManager();        FragmentTransaction  fragmentTransaction = fragmentManager.beginTransaction();        Fragment newfragment =new MyFragment();        fragmentTransaction.replace(R.layout.activity_main,newfragment ).commit();    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

1.匯入的包

2.extends

3.getSurpport……