android 77 fragment

2023-01-01 12:22:00

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();

    }

}

<LinearLayout 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"

    tools:context=".MainActivity"

    android:orientation="horizontal"

    >

    <FrameLayout

        android:id="@+id/fl"

        android:layout_weight="1"

        android:layout_width="0dp"

        android:layout_height="match_parent"

        ></FrameLayout>

     <LinearLayout

        android:layout_width="wrap_content"

        android:layout_height="match_parent"

        android:orientation="vertical"

        >

        <Button

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="fragment01"

            android:onClick="click1"

            />

        <Button

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="fragment02"

            android:onClick="click2"

            />

        <Button

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="fragment03"

            android:onClick="click3"

            />

    </LinearLayout>

</LinearLayout>

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");

    }

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:background="#ff0000"

    >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="热情的红色"

        android:textSize="20sp"

        />

</LinearLayout>

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;

    }

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:background="#0000ff"

    >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="忧桑的蓝色"

        android:textSize="20sp"

        />

</LinearLayout>

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");

    }

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:background="#00ff00"

    >

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="小志的绿色"

        android:textSize="20sp"

        />

</LinearLayout>

码农公寓

相关文章