Android 程式开发：（三）初识Fragment —— 3.2动态添加

fragment的真正用处是在程序运行过程中动态地添加。

1.工程目录。

2.res/layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

</LinearLayout>

3.res/layout/fragment1.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#00FF00"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/lblFragment1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="This is fragment #1"
        android:textColor="#000000"
        android:textSize="25sp" />

</LinearLayout>

4.res/layout/fragment2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:background="#FFFE00"
 android:orientation="vertical" >

 <TextView
 android:layout_width="fill_parent"
 android:layout_height="wrap_content"
 android:text="This is fragment #2"
 android:textColor="#000000"
 android:textSize="25sp" />

</LinearLayout>

5.Fragment1.java

package net.horsttnann.Fragments;

import net.horsttnann.Fragments.R;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class Fragment1 extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // ---Inflate the layout for this fragment---
        return inflater.inflate(R.layout.fragment1, container, false);
    }
}

6.Fragment2.java

package net.horsttnann.Fragments;

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

public class Fragment2 extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // ---Inflate the layout for this fragment---
        return inflater.inflate(R.layout.fragment2, container, false);
    }
}

7.FragmentsActivity.java

package net.horsttnann.Fragments;

import net.horsttnann.Fragments.R;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.Display;
import android.view.WindowManager;

public class FragmentsActivity extends Activity {
 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);

 FragmentManager fragmentManager = getFragmentManager();
 FragmentTransaction fragmentTransaction = fragmentManager
 .beginTransaction();

 // ---get the current display info---
 WindowManager wm = getWindowManager();
 Display d = wm.getDefaultDisplay();
 if (d.getWidth() > d.getHeight()) {
 // ---landscape mode---
 Fragment1 fragment1 = new Fragment1();
 // android.R.id.content refers to the content
 // view of the activity
 fragmentTransaction.replace(android.R.id.content, fragment1);
 } else {
 // ---portrait mode---
 Fragment2 fragment2 = new Fragment2();
 fragmentTransaction.replace(android.R.id.content, fragment2);
 }
 // ---add to the back stack---
 fragmentTransaction.addToBackStack(null);
 fragmentTransaction.commit();

 }

}

8.调试。

效果图：