Fragment

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看下效果图

MainActivity.java

package com.example.fragemts;import android.app.Activity;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.Menu;import android.view.MenuItem;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.LinearLayout;public class MainActivity extends FragmentActivity implements OnClickListener {private LinearLayout mFrag;private Button mBtn,mBtn2;private Fragment1 frag1;private Fragment2 frag2;private FragmentManager manager;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);manager=getSupportFragmentManager();initView();hideFrag();FragmentTransaction ft = manager.beginTransaction();frag1=new Fragment1();ft.add(R.id.mFrag, frag1);ft.commit();}private void initView() {mFrag=(LinearLayout) findViewById(R.id.mFrag);mBtn=(Button) findViewById(R.id.mBtn);mBtn2=(Button) findViewById(R.id.mBtn2);mBtn.setOnClickListener(this);mBtn2.setOnClickListener(this);}@Overridepublic void onClick(View v) {int Id = v.getId();hideFrag();selectFrag(Id);}private void hideFrag(){FragmentTransaction ft = manager.beginTransaction();if (frag1!=null) {ft.hide(frag1);}if (frag2!=null) {ft.hide(frag2);}ft.commit();}private void selectFrag(int Id) {FragmentTransaction ft = manager.beginTransaction();switch (Id) {case R.id.mBtn:if (frag1!=null) {ft.show(frag1);}ft.commit();break;case R.id.mBtn2:if (frag2==null) {frag2=new Fragment2();ft.add(R.id.mFrag, frag2);}else {ft.show(frag2);}ft.commit();break;}}}

Fragment1.java

package com.example.fragemts;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.TextView;public class Fragment1 extends Fragment{@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {// TODO Auto-generated method stubTextView tv=new TextView(getActivity());tv.setText("我是Fragment1");return tv;}}

Fragment2.java

同上

activity_main.xml

<RelativeLayout 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"    tools:context="com.example.fragemts.MainActivity" >    <LinearLayout        android:id="@+id/Lin"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:orientation="horizontal" >        <Button            android:id="@+id/mBtn"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1"            android:text="Framgent1" />        <Button            android:id="@+id/mBtn2"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_weight="1"            android:text="Framgent2" />    </LinearLayout>    <LinearLayout        android:id="@+id/mFrag"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:layout_above="@id/Lin"        android:orientation="vertical" >    </LinearLayout></RelativeLayout>

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