android 77 fragment-白红宇

android 77 fragment

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发布时间：2019-06-21

本文共 5493 字，大约阅读时间需要 18 分钟。

fragment是3.0之后才有的，之前平板是3.0专用，后来手机和平板都用3.0

Activity：

package com.itheima.fragment;import android.os.Bundle;import android.app.Activity;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.view.Menu;import android.view.View;public class MainActivity extends Activity {    private Fragment03 fg3;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                fg3 = new Fragment03();        //获取fragment管理器        FragmentManager fm = getFragmentManager();        //打开事务        FragmentTransaction ft = fm.beginTransaction();        //把内容显示至帧布局        ft.replace(R.id.fl, fg3);        //提交        ft.commit();    }    public void click1(View v){        //把fragment01的界面显示至帧布局中        //创建fragment对象        Fragment01 fg1 = new Fragment01();        //获取fragment管理器        FragmentManager fm = getFragmentManager();        //打开事务        FragmentTransaction ft = fm.beginTransaction();        //把内容显示至帧布局        ft.replace(R.id.fl, fg1);        //提交        ft.commit(); commit()之前没有调用addToBackStack()，那个fragment将会是destroyed；如果调用了addToBackStack()，这个fragment会是stopped，可以通过返回键来恢复。    }        public void click2(View v){        //把fragment01的界面显示至帧布局中        //创建fragment对象        Fragment02 fg2 = new Fragment02();        //获取fragment管理器        FragmentManager fm = getFragmentManager();        //打开事务        FragmentTransaction ft = fm.beginTransaction();        //把内容显示至帧布局        ft.replace(R.id.fl, fg2);        //提交        ft.commit();    }        public void click3(View v){        //把fragment01的界面显示至帧布局中        //获取fragment管理器        FragmentManager fm = getFragmentManager();        //打开事务        FragmentTransaction ft = fm.beginTransaction();        //把内容显示至帧布局        ft.replace(R.id.fl, fg3);        //提交        ft.commit();    }}

fragment1

package com.itheima.fragment;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class Fragment01 extends Fragment {    //返回的view对象会作为fragment01的内容显示在屏幕上    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        //inflater是布局填充器        View v = inflater.inflate(R.layout.fragment01, null);        return v;    }        @Override    public void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        System.out.println("01create");    }        @Override    public void onStart() {        // TODO Auto-generated method stub        super.onStart();        System.out.println("01start");    }        @Override    public void onResume() {        // TODO Auto-generated method stub        super.onResume();        System.out.println("01resume");    }        @Override    public void onPause() {        // TODO Auto-generated method stub        super.onPause();        System.out.println("01pause");    }        @Override    public void onStop() {        // TODO Auto-generated method stub        super.onStop();        System.out.println("01stop");    }        @Override    public void onDestroy() {        // TODO Auto-generated method stub        super.onDestroy();        System.out.println("01destroy");    }}

fragment2

package com.itheima.fragment;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class Fragment02 extends Fragment {    //返回的view对象会作为fragment02的内容显示在屏幕上    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        // TODO Auto-generated method stub        View v = inflater.inflate(R.layout.fragment02, null);        return v;    }}

fragment3：

package com.itheima.fragment;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;public class Fragment03 extends Fragment {    //返回的view对象会作为fragment03的内容显示在屏幕上    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        // TODO Auto-generated method stub        View v = inflater.inflate(R.layout.fragment03, null);        return v;    }        @Override    public void onCreate(Bundle savedInstanceState) {        // TODO Auto-generated method stub        super.onCreate(savedInstanceState);        System.out.println("03create");    }        @Override    public void onStart() {        // TODO Auto-generated method stub        super.onStart();        System.out.println("03start");    }        @Override    public void onResume() {        // TODO Auto-generated method stub        super.onResume();        System.out.println("03resume");    }        @Override    public void onPause() {        // TODO Auto-generated method stub        super.onPause();        System.out.println("03pause");    }        @Override    public void onStop() {        // TODO Auto-generated method stub        super.onStop();        System.out.println("03stop");    }        @Override    public void onDestroy() {        // TODO Auto-generated method stub        super.onDestroy();        System.out.println("03destroy");    }}