Android Fragment (二) 实例1

　　千呼万唤始出来，今天就也写一篇Frament 的简单实例。先看效果：

 一看这效果，首先我们的配置资源文件：new -->android xml -->selector -->

四个图片选择效果，一个文字选择效果

　　列如 tab_menu_frist：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:drawable="@drawable/tabbar_mehl" android:state_selected="true" />
    <item android:drawable="@drawable/tabbar_me" />
</selector>

　　列如 tab_menu_text： 

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item android:color="@android:color/holo_blue_bright" android:state_selected="true" />
    <item android:color="@android:color/darker_gray" />
</selector>

 图片资源：

-----activity_main.xml

<RelativeLayout 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">

    <RelativeLayout
        android:id="@+id/ly_top_bar"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:background="@android:color/holo_orange_light">

        <TextView 
            android:id="@+id/txt_topbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_centerInParent="true"
            android:gravity="center"
            android:textSize="18sp"
            android:textColor="@android:color/holo_green_light"
            android:text="信息"/>

        <View
            android:layout_width="match_parent"
            android:layout_height="2px"
            android:background="@android:color/white"
            android:layout_alignParentBottom="true"/>

    </RelativeLayout>

    <LinearLayout
        android:id="@+id/ly_tab_bar"
        android:layout_width="match_parent"
        android:layout_height="62dp"
        android:layout_alignParentBottom="true"
        android:background="@android:color/white"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/txt_channel"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:drawablePadding="3dp"
            android:drawableTop="@drawable/tab_menu_frist"
            android:gravity="center"
            android:padding="5dp"
            android:text="@string/one"
            android:textColor="@drawable/tab_menu_text"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/txt_message"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:drawablePadding="3dp"
            android:drawableTop="@drawable/tab_menu_two"
            android:gravity="center"
            android:padding="5dp"
            android:text="@string/tow"
            android:textColor="@drawable/tab_menu_text"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/txt_better"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:drawablePadding="3dp"
            android:drawableTop="@drawable/tab_menu_three"
            android:gravity="center"
            android:padding="5dp"
            android:text="@string/three"
            android:textColor="@drawable/tab_menu_text"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/txt_setting"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:drawablePadding="3dp"
            android:drawableTop="@drawable/tab_menu_four"
            android:gravity="center"
            android:padding="5dp"
            android:text="@string/four"
            android:textColor="@drawable/tab_menu_text"
            android:textSize="16sp"/>

    </LinearLayout>

    <View
        android:id="@+id/div_tab_bar"
        android:layout_width="match_parent"
        android:layout_height="2px"
        android:background="@android:color/white"
        android:layout_above="@id/ly_tab_bar"/>

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/ly_top_bar"
        android:layout_above="@id/div_tab_bar"
        android:id="@+id/ly_content">

    </FrameLayout>

</RelativeLayout>

再写一个中间部分的xml--->fg_content.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/txt_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="呵呵"
        android:textColor="@android:color/holo_green_light"
        android:textSize="20sp"/>

</LinearLayout>

写一个MyFrament 继承Frament 来实例Frament

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class MyFragment extends Fragment{
    private String content;
    public MyFragment(String content) {
        this.content = content;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fg_content,container,false);
        TextView txt_content = (TextView) view.findViewById(R.id.txt_content);
        txt_content.setText(content);
        return view;
    }
}

最后，写MainActivity代码：

import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.FrameLayout;
import android.widget.TextView;

public class MainActivity extends Activity implements View.OnClickListener{

    //UI Object
    private TextView txt_topbar;
    private TextView txt_channel;
    private TextView txt_message;
    private TextView txt_better;
    private TextView txt_setting;
    private FrameLayout ly_content;

    //Fragment Object
    private MyFragment fg1,fg2,fg3,fg4;
    private FragmentManager fManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
        fManager = getFragmentManager();
        bindViews();
        txt_channel.performClick();   //模拟一次点击，既进去后选择第一项
    }

    //UI组件初始化与事件绑定
    private void bindViews() {
        txt_topbar = (TextView) findViewById(R.id.txt_topbar);
        txt_channel = (TextView) findViewById(R.id.txt_channel);
        txt_message = (TextView) findViewById(R.id.txt_message);
        txt_better = (TextView) findViewById(R.id.txt_better);
        txt_setting = (TextView) findViewById(R.id.txt_setting);
        ly_content = (FrameLayout) findViewById(R.id.ly_content);

        txt_channel.setOnClickListener(this);
        txt_message.setOnClickListener(this);
        txt_better.setOnClickListener(this);
        txt_setting.setOnClickListener(this);
    }

    //重置所有文本的选中状态
    private void setSelected(){
        txt_channel.setSelected(false);
        txt_message.setSelected(false);
        txt_better.setSelected(false);
        txt_setting.setSelected(false);
    }

    //隐藏所有Fragment
    private void hideAllFragment(FragmentTransaction fragmentTransaction){
        if(fg1 != null)fragmentTransaction.hide(fg1);
        if(fg2 != null)fragmentTransaction.hide(fg2);
        if(fg3 != null)fragmentTransaction.hide(fg3);
        if(fg4 != null)fragmentTransaction.hide(fg4);
    }

    @Override
    public void onClick(View v) {
        FragmentTransaction fTransaction = fManager.beginTransaction();
        hideAllFragment(fTransaction);
        switch (v.getId()){
            case R.id.txt_channel:
                setSelected();
                txt_channel.setSelected(true);
                if(fg1 == null){
                    fg1 = new MyFragment("第一个Fragment");
                    fTransaction.add(R.id.ly_content,fg1);
                }else{
                    fTransaction.show(fg1);
                }
                break;
            case R.id.txt_message:
                setSelected();
                txt_message.setSelected(true);
                if(fg2 == null){
                    fg2 = new MyFragment("第二个Fragment");
                    fTransaction.add(R.id.ly_content,fg2);
                }else{
                    fTransaction.show(fg2);
                }
                break;
            case R.id.txt_better:
                setSelected();
                txt_better.setSelected(true);
                if(fg3 == null){
                    fg3 = new MyFragment("第三个Fragment");
                    fTransaction.add(R.id.ly_content,fg3);
                }else{
                    fTransaction.show(fg3);
                }
                break;
            case R.id.txt_setting:
                setSelected();
                txt_setting.setSelected(true);
                if(fg4 == null){
                    fg4 = new MyFragment("第四个Fragment");
                    fTransaction.add(R.id.ly_content,fg4);
                }else{
                    fTransaction.show(fg4);
                }
                break;
        }
        fTransaction.commit();
    }
}

谢谢大家的关注。　　　　Do what you say,say what you do.