fragment是3.0之后才有的，之前平板是3.0专用，后来手机和平板都用3.0
Activity：
package com.itheima.fragment; import android.os.Bundle; import android.app.Activity; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.view.Menu; import android.view.View; public class MainActivity extends Activity { private Fragment03 fg3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); fg3 = new Fragment03(); //获取fragment管理器 FragmentManager fm = getFragmentManager(); //打开事务 FragmentTransaction ft = fm.beginTransaction(); //把内容显示至帧布局 ft.replace(R.id.fl, fg3); //提交 ft.commit(); } public void click1(View v){ //把fragment01的界面显示至帧布局中 //创建fragment对象 Fragment01 fg1 = new Fragment01(); //获取fragment管理器 FragmentManager fm = getFragmentManager(); //打开事务 FragmentTransaction ft = fm.beginTransaction(); //把内容显示至帧布局 ft.replace(R.id.fl, fg1); //提交 ft.commit();
commit()之前没有调用addToBackStack()，那个fragment将会是destroyed；如果调用了addToBackStack()，这个fragment会是stopped，可以通过返回键来恢复。 } public void click2(View v){ //把fragment01的界面显示至帧布局中 //创建fragment对象 Fragment02 fg2 = new Fragment02(); //获取fragment管理器 FragmentManager fm = getFragmentManager(); //打开事务 FragmentTransaction ft = fm.beginTransaction(); //把内容显示至帧布局 ft.replace(R.id.fl, fg2); //提交 ft.commit(); } public void click3(View v){ //把fragment01的界面显示至帧布局中 //获取fragment管理器 FragmentManager fm = getFragmentManager(); //打开事务 FragmentTransaction ft = fm.beginTransaction(); //把内容显示至帧布局 ft.replace(R.id.fl, fg3); //提交 ft.commit(); } }
<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" tools:context=".MainActivity" android:orientation="horizontal" > <FrameLayout android:id="@+id/fl" android:layout_weight="1" android:layout_width="0dp" android:layout_height="match_parent" ></FrameLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="match_parent" android:orientation="vertical" > <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="fragment01" android:onClick="click1" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="fragment02" android:onClick="click2" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="fragment03" android:onClick="click3" /> </LinearLayout> </LinearLayout>
fragment1
package com.itheima.fragment; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment01 extends Fragment { //返回的view对象会作为fragment01的内容显示在屏幕上 @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { //inflater是布局填充器 View v = inflater.inflate(R.layout.fragment01, null); return v; } @Override public void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); System.out.println("01create"); } @Override public void onStart() { // TODO Auto-generated method stub super.onStart(); System.out.println("01start"); } @Override public void onResume() { // TODO Auto-generated method stub super.onResume(); System.out.println("01resume"); } @Override public void onPause() { // TODO Auto-generated method stub super.onPause(); System.out.println("01pause"); } @Override public void onStop() { // TODO Auto-generated method stub super.onStop(); System.out.println("01stop"); } @Override public void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); System.out.println("01destroy"); } }
<?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:orientation="vertical" android:background="#ff0000" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="热情的红色" android:textSize="20sp" /> </LinearLayout>
fragment2
package com.itheima.fragment; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment02 extends Fragment { //返回的view对象会作为fragment02的内容显示在屏幕上 @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub View v = inflater.inflate(R.layout.fragment02, null); return v; } }
<?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:orientation="vertical" android:background="#0000ff" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="忧桑的蓝色" android:textSize="20sp" /> </LinearLayout>
fragment3：
package com.itheima.fragment; import android.app.Fragment; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class Fragment03 extends Fragment { //返回的view对象会作为fragment03的内容显示在屏幕上 @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // TODO Auto-generated method stub View v = inflater.inflate(R.layout.fragment03, null); return v; } @Override public void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); System.out.println("03create"); } @Override public void onStart() { // TODO Auto-generated method stub super.onStart(); System.out.println("03start"); } @Override public void onResume() { // TODO Auto-generated method stub super.onResume(); System.out.println("03resume"); } @Override public void onPause() { // TODO Auto-generated method stub super.onPause(); System.out.println("03pause"); } @Override public void onStop() { // TODO Auto-generated method stub super.onStop(); System.out.println("03stop"); } @Override public void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); System.out.println("03destroy"); } }
<?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:orientation="vertical" android:background="#00ff00" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="小志的绿色" android:textSize="20sp" /> </LinearLayout>