Android Fragment建立选项卡

动态创建fragment来进行一个实践，来实现用Fragment创建一个选项卡
对于简单初学者 直接代码如下：

1项目activity根布局

<LinearLayout 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"
 android:orientation="vertical"
 tools:context=".MainActivity" >

 <LinearLayout
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="horizontal" >

  <TextView
   android:id="@+id/tab1"
   android:layout_width="0dip"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:gravity="center"
   android:text="社会新闻" />

  <TextView
   android:id="@+id/tab2"
   android:layout_width="0dip"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:gravity="center"
   android:text="生活新闻" />

  <TextView
   android:id="@+id/tab3"
   android:layout_width="0dip"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:gravity="center"
   android:text="军事新闻" />

  <TextView
   android:id="@+id/tab4"
   android:layout_width="0dip"
   android:layout_height="wrap_content"
   android:layout_weight="1"
   android:gravity="center"
   android:text="娱乐新闻" />
 </LinearLayout>

 <LinearLayout
  android:id="@+id/content"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" >
 </LinearLayout>

</LinearLayout>

2.项目fragment加载类

public class Fragment1 extends Fragment {
 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {
  return inflater.inflate(R.layout.fragment1, null);
 }

}

3. fragment对应的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:gravity="center"
 android:orientation="vertical" >

 <TextView
  android:id="@+id/textview1"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="社会新闻" 
  android:textAppearance="?android:attr/textAppearanceLarge"/>
</LinearLayout>

4. MainActivity主类

public class MainActivity extends Activity implements OnClickListener {

 private LinearLayout content;
 private TextView tv1, tv2, tv3, tv4;
 private FragmentManager fm;
 private FragmentTransaction ft;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  content = (LinearLayout) findViewById(R.id.content);

  tv1 = (TextView) findViewById(R.id.tab1);
  tv2 = (TextView) findViewById(R.id.tab2);
  tv3 = (TextView) findViewById(R.id.tab3);
  tv4 = (TextView) findViewById(R.id.tab4);

  tv1.setOnClickListener(this);
  tv2.setOnClickListener(this);
  tv3.setOnClickListener(this);
  tv4.setOnClickListener(this);

  fm = getFragmentManager();
  ft = fm.beginTransaction();
  ft.replace(R.id.content, new Fragment1()); // 默认情况下Fragment1

 }

 @Override
 public void onClick(View v) {
  ft = fm.beginTransaction();
  switch (v.getId()) {
  case R.id.tab1:
   ft.replace(R.id.content, new Fragment1());
   break;
  case R.id.tab2:
   ft.replace(R.id.content, new Fragment2());
   break;
  case R.id.tab3:
   ft.replace(R.id.content, new Fragment3());
   break;
  case R.id.tab4:
   ft.replace(R.id.content, new Fragment4());
   break;

  default:
   break;
  }
  ft.commit();

 }

}

运行结果如下：

image.png