21 RadioGroup ListFragment

2022-03-09 02:57:56

结构

MainActivity.java

package com.qf.day21_radiogroupfragment_demo3;

import java.util.ArrayList;

import java.util.List;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentTransaction;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends FragmentActivity {

    private RadioGroup rgMain;

    //Fragment数据源

    private List<Fragment> list = new ArrayList<Fragment>();

    private RadioButton[] rbs;

    private String[] titles={"news","happy","dz","cj"};

    private int currentIndex =0;//当前展示的Fragment

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        rgMain = (RadioGroup) findViewById(R.id.rg_main);

        initData();

        initTab();

    }

    //初始化标签

    private void initTab(){

        //改变标签内容

        rbs = new RadioButton[rgMain.getChildCount()];

        for(int i=0;i<rgMain.getChildCount();i++){

            rbs[i] = (RadioButton) rgMain.getChildAt(i);

            rbs[i].setText(titles[i]);

        }

        //点击按钮进行替换

        rgMain.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override

            public void onCheckedChanged(RadioGroup group, int checkedId) {

                // TODO Auto-generated method stub

                for(int i=0;i<rgMain.getChildCount();i++){

                    if(rbs[i].getId() == checkedId){//当前按钮被点击

                        //开始替换

                        //replaceFragment(i);

                        switchFragment(i);

                    }

                }

            }

        });

    }

    //replace  缺点  影响性能

    public void replaceFragment(int index){

        MyFragment myFragment = MyFragment.getInstance(index+1);

        getSupportFragmentManager().

        beginTransaction().

        replace(R.id.layout_content_id, list.get(index)).commit();

    }

    //替换   使用 show() 和hide() 方法  减少性能开销

    public void  switchFragment(int targetIndex){

        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

        //点击的Fragment(目标)

        Fragment targetFragment = list.get(targetIndex);

        //当前的Fragment

        Fragment currentFragment = list.get(currentIndex);

        //点击的 按钮对象的Fragment 存在    show()展示出来  隐藏当前的Fragment

        if(!targetFragment.isAdded()){

            transaction.add(R.id.layout_content_id, targetFragment).hide(currentFragment).commit();

        }else{

            transaction.show(targetFragment).hide(currentFragment).commit();

        }

        //当前展示的Fragment就是点击替换的Fragment

        currentIndex = targetIndex;

    }

    //初始化数据

    private void initData(){

        for(int i=0;i<rgMain.getChildCount();i++){

            MyFragment myFragment = MyFragment.getInstance(i+1);

            list.add(myFragment);

        }

        //程序运行  默认展示第一个Fragment

        getSupportFragmentManager().

        beginTransaction().

        add(R.id.layout_content_id, list.get(0)).commit();

    }

}

MyFragment.java

package com.qf.day21_radiogroupfragment_demo3;

import java.util.ArrayList;

import java.util.List;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentTransaction;

import android.widget.RadioButton;

import android.widget.RadioGroup;

import android.widget.RadioGroup.OnCheckedChangeListener;

public class MainActivity extends FragmentActivity {

    private RadioGroup rgMain;

    //Fragment数据源

    private List<Fragment> list = new ArrayList<Fragment>();

    private RadioButton[] rbs;

    private String[] titles={"news","happy","dz","cj"};

    private int currentIndex =0;//当前展示的Fragment

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        rgMain = (RadioGroup) findViewById(R.id.rg_main);

        initData();

        initTab();

    }

    //初始化标签

    private void initTab(){

        //改变标签内容

        rbs = new RadioButton[rgMain.getChildCount()];

        for(int i=0;i<rgMain.getChildCount();i++){

            rbs[i] = (RadioButton) rgMain.getChildAt(i);

            rbs[i].setText(titles[i]);

        }

        //点击按钮进行替换

        rgMain.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override

            public void onCheckedChanged(RadioGroup group, int checkedId) {

                // TODO Auto-generated method stub

                for(int i=0;i<rgMain.getChildCount();i++){

                    if(rbs[i].getId() == checkedId){//当前按钮被点击

                        //开始替换

                        //replaceFragment(i);

                        switchFragment(i);

                    }

                }

            }

        });

    }

    //replace  缺点  影响性能

    public void replaceFragment(int index){

        MyFragment myFragment = MyFragment.getInstance(index+1);

        getSupportFragmentManager().

        beginTransaction().

        replace(R.id.layout_content_id, list.get(index)).commit();

    }

    //替换   使用 show() 和hide() 方法  减少性能开销

    public void  switchFragment(int targetIndex){

        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

        //点击的Fragment(目标)

        Fragment targetFragment = list.get(targetIndex);

        //当前的Fragment

        Fragment currentFragment = list.get(currentIndex);

        //点击的 按钮对象的Fragment 存在    show()展示出来  隐藏当前的Fragment

        if(!targetFragment.isAdded()){

            transaction.add(R.id.layout_content_id, targetFragment).hide(currentFragment).commit();

        }else{

            transaction.show(targetFragment).hide(currentFragment).commit();

        }

        //当前展示的Fragment就是点击替换的Fragment

        currentIndex = targetIndex;

    }

    //初始化数据

    private void initData(){

        for(int i=0;i<rgMain.getChildCount();i++){

            MyFragment myFragment = MyFragment.getInstance(i+1);

            list.add(myFragment);

        }

        //程序运行  默认展示第一个Fragment

        getSupportFragmentManager().

        beginTransaction().

        add(R.id.layout_content_id, list.get(0)).commit();

    }

}

selecte_main.xml

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

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

    <item android:state_checked="true" android:drawable="@android:drawable/ic_menu_add"></item>

    <item android:state_checked="false" android:drawable="@android:drawable/ic_menu_call"></item>

</selector>

activity_main.xml

<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"

    android:orientation="vertical"

    tools:context=".MainActivity" >

    <RadioGroup

        android:id="@+id/rg_main"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal" >

        <RadioButton

            android:id="@+id/rb1"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:button="@null"

            android:drawableTop="@drawable/selecte_main"

            android:gravity="center"

            android:checked="true"

            android:text="新闻" />

        <RadioButton

             android:id="@+id/rb2"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:button="@null"

            android:drawableTop="@drawable/selecte_main"

            android:gravity="center"

            android:text="娱乐" />

        <RadioButton

             android:id="@+id/rb3"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:button="@null"

            android:drawableTop="@drawable/selecte_main"

            android:gravity="center"

            android:text="体育" />

        <RadioButton

             android:id="@+id/rb4"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:button="@null"

            android:drawableTop="@drawable/selecte_main"

            android:gravity="center"

            android:text="财经" />

    </RadioGroup>

    <FrameLayout

        android:id="@+id/layout_content_id"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        ></FrameLayout>

</LinearLayout>

fragment_layout.xml

<?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" >

    <TextView

        android:id="@+id/tv_show"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:textColor="#f00"

        android:text="AAA"

        />

    <ListView

        android:id="@android:id/list"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        ></ListView>

</LinearLayout>

item.xml

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

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

     >

    <ImageView

        android:id="@+id/iv_item"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/ic_launcher"

        />

    <TextView

        android:id="@+id/title_item"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_toRightOf="@id/iv_item"

        android:text="name"

        />

    <TextView

        android:id="@+id/content_item"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_toRightOf="@id/iv_item"

        android:text="aaa"

        android:layout_alignBottom="@id/iv_item"

        />

</RelativeLayout>

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