Android Fragment 学习<一>

程序包含一个继承Activity的主类,另外两个继承Fragment类,并且两个Fragment共用一个xml layout文件

主类程序如下:

package com.example.androidfragmentd01test;

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

@SuppressLint("NewApi")
public class MainActivity extends Activity {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  
  FragmentManager fm=getFragmentManager();
  
  addShowHideListener(R.id.frag1hide,fm.findFragmentById(R.id.fragment1));
  addShowHideListener(R.id.frag2hide,fm.findFragmentById(R.id.fragment2));
  
 }

 private void addShowHideListener(int button1, final Fragment findFragmentById) {
  // TODO Auto-generated method stub
  final Button button;
  button=(Button)findViewById(button1);
  button.setOnClickListener(new OnClickListener(){

   @Override
   public void onClick(View v) {
    // TODO Auto-generated method stub
    FragmentTransaction ft=getFragmentManager().beginTransaction();
    ft.setCustomAnimations(android.R.animator.fade_in, android.R.animator.fade_out);
    
    if(findFragmentById.isHidden()){
     ft.show(findFragmentById);
     button.setText("Hide");
    }else{
     ft.hide(findFragmentById);
     button.setText("Show");
    }
    ft.commit();
   }
   
  });
  
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

}

主类的相关配置文件:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:gravity="center_horizontal"  
    android:layout_width="match_parent" android:layout_height="match_parent">  
  
    <TextView android:layout_width="match_parent" android:layout_height="wrap_content"  
        android:gravity="center_vertical|center_horizontal"  
        android:textAppearance="?android:attr/textAppearanceMedium"  
        android:text="Demonstration of hiding and showing fragments." />  

    <LinearLayout android:orientation="horizontal" 
        android:padding="4dip"  
        android:gravity="center_vertical" 
        android:layout_weight="1"  
        android:layout_width="match_parent" 
        android:layout_height="wrap_content">  

        <Button android:id="@+id/frag1hide"  
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"  
            android:text="Hide" />  
          
        <fragment android:name="com.example.androidfragmentd01test.FirstFragment"
                android:id="@+id/fragment1" 
                android:layout_weight="1"  
                android:layout_width="0px" 
                android:layout_height="wrap_content" />  

    </LinearLayout>  

 
    <LinearLayout android:orientation="horizontal" android:padding="4dip"  
        android:gravity="center_vertical" android:layout_weight="1"  
        android:layout_width="match_parent" android:layout_height="wrap_content">  

        <Button android:id="@+id/frag2hide"  
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"  
            android:text="Hide" />  
          
        <fragment android:name="com.example.androidfragmentd01test.SecondFragment" 
                android:id="@+id/fragment2" 
                android:layout_weight="1"  
                android:layout_width="0px" 
                android:layout_height="wrap_content" />  

    </LinearLayout>  

</LinearLayout>  

新建Fragmentone和Fragmenttwo:
Fragmentone如下:

package com.example.androidfragmentd01test;

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

@SuppressLint("NewApi")
public class FirstFragment extends Fragment{

    private TextView mTextView;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,  
            Bundle savedInstanceState) {  
        //从文件 example_fragment.xml 加载了一个layout   
        View v = inflater.inflate(R.layout.text_edit, container, false);  
          
        View tv = v.findViewById(R.id.msg);  
        ((TextView)tv).setText("The fragment saves and restores this text.");  
  
        mTextView = (TextView)v.findViewById(R.id.saved);  
        if (savedInstanceState != null) {  
            mTextView.setText(savedInstanceState.getCharSequence("text"));  
        }  
        return v;  
    }  
  
    @Override  
    public void onSaveInstanceState(Bundle outState) {  
        super.onSaveInstanceState(outState);  
  
        outState.putCharSequence("text", mTextView.getText());  
    }  


}

Fragmenttwo如下:

package com.example.androidfragmentd01test;

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

@SuppressLint("NewApi")
public class SecondFragment extends Fragment{

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,  
            Bundle savedInstanceState) {  
        //从文件 example_fragment.xml 加载了一个layout   
        View v = inflater.inflate(R.layout.text_edit, container, false);  
        View tv = v.findViewById(R.id.msg);  
        ((TextView)tv).setText("The TextView saves and restores this text.");  
        //另外一种TextView的保存模式  
        ((TextView)v.findViewById(R.id.saved)).setSaveEnabled(true);  
        return v;  
    }  
}

xml文件如下:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical" android:padding="4dip"  
    android:layout_width="match_parent" android:layout_height="wrap_content">  
  
    <TextView 
        android:id="@+id/msg"  
        android:layout_width="match_parent" 
        android:layout_height="wrap_content"  
        android:layout_weight="0"  
        android:paddingBottom="4dip" />  
  
    <EditText 
        android:id="@+id/saved"  
        android:layout_width="match_parent" 
        android:layout_height="wrap_content"  
        android:layout_weight="1"  
        android:text="@string/initial_text"  
        android:freezesText="true">  
        <requestFocus />  
    </EditText>  
  
</LinearLayout> 

 

欲行即可.

<Linker from : http://blog.csdn.net/flying_tao/article/details/6596518>