1、使用Fragment 可以方便的替代TabActivity、ViewGroup
2、同时也省去了在AndroidManifest.xml文件中 添加相应的Activity
3、Fragment 是3.0之后的功能,如果想向下兼容我们在导包时一定要注意了,该导入 import android.support.v4.app.FragmentActivity; 而不是 import android.app.Fragment;
4、同时向下兼容我们的Activity 要继承 FragmentActivity 而不是 Activity
5、核心代码:
package com.example.testdialog; import android.annotation.SuppressLint; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.view.View; import android.view.View.OnClickListener; import android.widget.TextView; @SuppressLint("NewApi") public class MainActivity extends FragmentActivity implements OnClickListener { private TextView tab1 = null; private TextView tab2 = null; private FragmentManager fm = null; private FragmentTransaction ft = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(); fm = getSupportFragmentManager(); } private void findViewById() { this.tab1 = (TextView) this.findViewById(R.id.tab1); this.tab2 = (TextView) this.findViewById(R.id.tab2); this.tab1.setOnClickListener(this); this.tab2.setOnClickListener(this); } @Override public void onClick(View v) { ft = fm.beginTransaction(); switch (v.getId()) { case R.id.tab1: ft.replace(R.id.content, new MyFragment1()); break; case R.id.tab2: ft.replace(R.id.content, new MyFragment2()); break; default: break; } ft.commit(); } }
activity_main.xml 文件:
<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="match_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="Tab1" /> <TextView android:id="@+id/tab2" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="Tab2" /> <TextView android:id="@+id/tab3" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="Tab3" /> <TextView android:id="@+id/tab4" android:layout_width="0dip" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" android:text="Tab2" /> </LinearLayout> <LinearLayout android:id="@+id/content" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginTop="20dip" android:orientation="horizontal" > </LinearLayout> </LinearLayout>
MyFragment1.java
package com.example.testdialog; import android.annotation.SuppressLint; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; @SuppressLint("NewApi") public class MyFragment1 extends Fragment { private Button button1 = null; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment1, null); button1 = (Button) view.findViewById(R.id.button1); return view; } }
6、这样我们就可以在相应的 Fragment 中做我们的UI设计了