21 RadioGroup ListFragment

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();
}

}

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();
}

}

<?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>

<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>

<?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>

<?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>