Android新手入門教程（十三）：初識Fragment の動態添加 – Android移動開發技術文章_手機開發 Android移動開發教學課程

fragment的真正用處是在程序運行過程中動態地添加。

1.工程目錄。

2.res/layout/main.xml

[java]<?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> 
<?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

[java] <?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> 
<?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

[java] <?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> 
<?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

[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); 
    } 
} 
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

[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); 
    } 
} 
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

[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(); 
 
    } 
 
} 
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.調試。

效果圖：

摘自  horsttnann的專欄