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

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

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

    妈蛋,找了好久!一直以为子类对象不能赋值给父类引用。这部科学啊!

    错误代码:

    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.导入的包

    2.extends

    3.getSurpport……

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  • 原文地址:https://www.cnblogs.com/1114250779boke/p/3867494.html
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