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21 RadioGroup ListFragment

來源：程序員人生發布時間：2016-12-15 09:41:15 閱讀次數：2764次

結構

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

    private RadioButton[] rbs;

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

    private int currentIndex =0;//當前展現的Fragment

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

        initData();
        initTab();
    }

    //初始化標簽
    private void initTab(){
        //改變標簽內容
        rbs = new RadioButton[rgMain.getChildCount()];
        for(int i=0;i<rgMain.getChildCount();i++){
            rbs[i] = (RadioButton) rgMain.getChildAt(i);
            rbs[i].setText(titles[i]);
        }

        //點擊按鈕進行替換
        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){//當前按鈕被點擊
                        //開始替換
                        //replaceFragment(i);
                        switchFragment(i);
                    }

                }
            }
        });

    }
    //replace  缺點  影響性能
    public void replaceFragment(int index){
        MyFragment myFragment = MyFragment.getInstance(index+1);
        getSupportFragmentManager().
        beginTransaction().
        replace(R.id.layout_content_id, list.get(index)).commit();

    }

    //替換   使用 show() 和hide() 方法  減少性能開消
    public void  switchFragment(int targetIndex){

        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

        //點擊的Fragment(目標)
        Fragment targetFragment = list.get(targetIndex);
        //當前的Fragment
        Fragment currentFragment = list.get(currentIndex);

        //點擊的 按鈕對象的Fragment 存在    show()展現出來  隱藏當前的Fragment
        if(!targetFragment.isAdded()){
            transaction.add(R.id.layout_content_id, targetFragment).hide(currentFragment).commit();
        }else{
            transaction.show(targetFragment).hide(currentFragment).commit();
        }

        //當前展現的Fragment就是點擊替換的Fragment
        currentIndex = targetIndex;

    }


    //初始化數據
    private void initData(){
        for(int i=0;i<rgMain.getChildCount();i++){
            MyFragment myFragment = MyFragment.getInstance(i+1);
            list.add(myFragment);
        }
        //程序運行  默許展現第1個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數據源
    private List<Fragment> list = new ArrayList<Fragment>();

    private RadioButton[] rbs;

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

    private int currentIndex =0;//當前展現的Fragment

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

        initData();
        initTab();
    }

    //初始化標簽
    private void initTab(){
        //改變標簽內容
        rbs = new RadioButton[rgMain.getChildCount()];
        for(int i=0;i<rgMain.getChildCount();i++){
            rbs[i] = (RadioButton) rgMain.getChildAt(i);
            rbs[i].setText(titles[i]);
        }

        //點擊按鈕進行替換
        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){//當前按鈕被點擊
                        //開始替換
                        //replaceFragment(i);
                        switchFragment(i);
                    }

                }
            }
        });

    }
    //replace  缺點  影響性能
    public void replaceFragment(int index){
        MyFragment myFragment = MyFragment.getInstance(index+1);
        getSupportFragmentManager().
        beginTransaction().
        replace(R.id.layout_content_id, list.get(index)).commit();

    }

    //替換   使用 show() 和hide() 方法  減少性能開消
    public void  switchFragment(int targetIndex){

        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();

        //點擊的Fragment(目標)
        Fragment targetFragment = list.get(targetIndex);
        //當前的Fragment
        Fragment currentFragment = list.get(currentIndex);

        //點擊的 按鈕對象的Fragment 存在    show()展現出來  隱藏當前的Fragment
        if(!targetFragment.isAdded()){
            transaction.add(R.id.layout_content_id, targetFragment).hide(currentFragment).commit();
        }else{
            transaction.show(targetFragment).hide(currentFragment).commit();
        }

        //當前展現的Fragment就是點擊替換的Fragment
        currentIndex = targetIndex;

    }


    //初始化數據
    private void initData(){
        for(int i=0;i<rgMain.getChildCount();i++){
            MyFragment myFragment = MyFragment.getInstance(i+1);
            list.add(myFragment);
        }
        //程序運行  默許展現第1個Fragment
        getSupportFragmentManager().
        beginTransaction().
        add(R.id.layout_content_id, list.get(0)).commit();
    }


}

selecte_main.xml

<?xml version="1.0" encoding="utf⑻"?>
<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="新聞" />

        <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="文娛" />

        <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="體育" />

        <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="財經" />
    </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="utf⑻"?>
<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="utf⑻"?>
<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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21 RadioGroup ListFragment