Android 程式开发：（三）初识Fragment —— 3.2动态添加

最新推荐文章于 2025-12-01 23:16:48 发布

最新推荐文章于 2025-12-01 23:16:48 发布 · 86 阅读

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#移动开发 #java

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: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：