Fragement的使用

fragment分为动态加载和静态加载

静态加载的方法

  布局文件 main.xml

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <LinearLayout        android:id="@+id/frame"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:orientation="vertical" >    </LinearLayout>    <RadioGroup        android:id="@+id/radiogroup"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:gravity="center_horizontal"        android:orientation="horizontal" >       <span style="color:#ff0000;"> <RadioButton            android:id="@+id/first"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:background="@drawable/radio_pressed"            android:button="@null"            android:drawableTop="@drawable/ic_launcher"            android:gravity="center_horizontal"            android:text="静态加载" /></span>        <RadioButton            android:id="@+id/second"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:background="@drawable/radio_pressed"            android:button="@null"            android:drawableTop="@drawable/ic_launcher"            android:gravity="center_horizontal"            android:text="动态加载" />        <RadioButton            android:id="@+id/thrid"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:background="@drawable/radio_pressed"            android:button="@null"            android:drawableTop="@drawable/ic_launcher"            android:gravity="center_horizontal"            android:text="生命周期" />        <RadioButton            android:id="@+id/fourth"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_weight="1"            android:background="@drawable/radio_pressed"            android:button="@null"            android:drawableTop="@drawable/ic_launcher"            android:gravity="center_horizontal"            android:text="传值通信" />    </RadioGroup></RelativeLayout>

对应Java文件

MainActivity.java

package com.example.android_fragment;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import android.app.Activity;import android.app.Fragment;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.content.Intent;import android.os.Bundle;import android.widget.RadioGroup;import android.widget.RadioGroup.OnCheckedChangeListener;public class MainActivity extends Activity implements OnCheckedChangeListener {private RadioGroup group;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.main);group = (RadioGroup) findViewById(R.id.radiogroup);group.setOnCheckedChangeListener(this);}@Overridepublic void onCheckedChanged(RadioGroup group, int checkedId) {// TODO Auto-generated method stubswitch (checkedId) {case R.id.first: {            Intent intent=new Intent(this,MainActivity2.class);            startActivity(intent);break;}case R.id.second: {            MyFragment2 fragment2=new MyFragment2();            FragmentManager fragmentManager = getFragmentManager();            FragmentTransaction beginTransaction = fragmentManager.beginTransaction();            beginTransaction.add(R.id.frame, fragment2);            beginTransaction.addToBackStack(null);            beginTransaction.commit();break;}case R.id.thrid: {            Intent intent=new Intent(MainActivity.this,MainActivity3.class);            startActivity(intent);break;}case R.id.fourth: {Intent intent=new Intent(MainActivity.this,MainActivity4.class);            startActivity(intent);break; }}}}

关系图

MainActivity2

package com.example.android_fragment;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity2 extends Activity{private TextView tv;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.main2);Button button=(Button) findViewById(R.id.button);tv=(TextView) findViewById(R.id.text);button.setText("改变");button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubtv.setText("TextView改变了");}});}}

main2.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:orientation="vertical" >    <fragment        android:id="@+id/fragment"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:name="com.example.android_fragment.MyFragment"        /></LinearLayout>

package com.example.android_fragment;import android.app.Fragment;import android.os.Bundle;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;public class MyFragment extends Fragment{private String aaa;public String getAaa() {return aaa;}public void setAaa(String aaa) {this.aaa = aaa;}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// TODO Auto-generated method stub//layout布局文件转换成View对象/** * resource:Fragment需要加载的布局文件 * root：加载layout的父ViewGroup * attactToRoot：false，不返回父ViewGroup */View view = inflater.inflate(R.layout.fragment, container, false);TextView text=(TextView) view.findViewById(R.id.text);Button button=(Button) view.findViewById(R.id.button);text.setText("静态加载Fragment");button.setText("获取内容");button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubString value = getAaa();Toast.makeText(getActivity(), "value="+value, Toast.LENGTH_SHORT).show();}});return view;}}

<?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" >        <TextView         android:id="@+id/text"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        /></LinearLayout>