Fragment
Fragment 可以作为一个轻量级的Activity使用。和Activity一样，它有自己的逻辑(Fragment.java)和视图(fragment.xml)。
- 创建
MainActivity.java和activity_main.xml - 创建
FirstFragment.java和fragment_first.xml - 创建
SecondFragment.java和fragment_second.xml
MainActivity
MainActivity 的 onCreate方法中加载 FirstFragment, 使用getSupportFragmentManager() .beginTransaction() .add(R.id.container, new FirstFragment()) .commit()
package com.s3abiscuit.android.testfragment;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
/*
* 两个Activity
* MainActivity包含FirstFragment和SecondFragment
* TabActivity包含Image1Fragmen，Image2Fragment和Image3Fragment
*/
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportFragmentManager()
.beginTransaction()
.add(R.id.container, new FirstFragment())
.commit();
}
}
activity_main.xml作为fragment的容器 container
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.s3abiscuit.android.testfragment.MainActivity">
</FrameLayout>
FirstFragment
FirstFragment.java定义一个Button跳转到SecondFragmnet,使用getFragmentManager() .beginTransaction() .addToBackStack(null) .replace(R.id.container, new SecondFragment()) .commit()
package com.s3abiscuit.android.testfragment;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class FirstFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public FirstFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment FirstFragment.
*/
// TODO: Rename and change types and number of parameters
public static FirstFragment newInstance(String param1, String param2) {
FirstFragment fragment = new FirstFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
System.out.println("FirstFragment_onAttach");
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
System.out.println("FirstFragment_onCreate");
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
System.out.println("FirstFragment_onCreateView");
View root = inflater.inflate(R.layout.fragment_first, container, false);
root.findViewById(R.id.btn_goto_secondfragment).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
getFragmentManager()
.beginTransaction()
.addToBackStack(null)
.replace(R.id.container, new SecondFragment())
.commit();
}
});
root.findViewById(R.id.btn_goto_tabActivity).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(new Intent(getActivity(), TabActivity.class));
}
});
return root;
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
System.out.println("FirstFragment_onActivityCreated");
}
@Override
public void onStart() {
super.onStart();
System.out.println("FirstFragment_onStart");
}
@Override
public void onResume() {
super.onResume();
System.out.println("FirstFragment_onResume");
}
@Override
public void onPause() {
super.onPause();
System.out.println("FirstFragment_onPause");
}
@Override
public void onDestroyView() {
super.onDestroyView();
System.out.println("FirstFragment_onDestroyView");
}
@Override
public void onDestroy() {
super.onDestroy();
System.out.println("FirstFragment_onDestroy");
}
@Override
public void onDetach() {
super.onDetach();
System.out.println("FirstFragment_onDetach");
}
}
fragment_first.xml
<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="com.s3abiscuit.android.testfragment.FirstFragment">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这是firstFragment"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳转到secondFragment"
android:id="@+id/btn_goto_secondfragment"
android:textAllCaps="false"/>
</LinearLayout>
SecondFragment
SecondFragment.java 定义Button返回到FirstFragment，使用getFragmentManager().popBackStack()
package com.s3abiscuit.android.testfragment;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class SecondFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public SecondFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* @param param1 Parameter 1.
* @param param2 Parameter 2.
* @return A new instance of fragment SecondFragment.
*/
// TODO: Rename and change types and number of parameters
public static SecondFragment newInstance(String param1, String param2) {
SecondFragment fragment = new SecondFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
System.out.println("SecondFragment_onAttach");
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
System.out.println("SecondFragment_onCreate");
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
System.out.println("SecondFragment_onCreateView");
View root = inflater.inflate(R.layout.fragment_second, container, false);
root.findViewById(R.id.btn_goto_firstfragment).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
getFragmentManager().popBackStack();
}
});
return root;
}
@Override
public void onStart() {
super.onStart();
System.out.println("SecondFragment_onStart");
}
@Override
public void onResume() {
super.onResume();
System.out.println("SecondFragment_onResume");
}
@Override
public void onPause() {
super.onPause();
System.out.println("SecondFragment_onPause");
}
@Override
public void onStop() {
super.onStop();
System.out.println("SecondFragment_onStop");
}
@Override
public void onDestroyView() {
super.onDestroyView();
System.out.println("SecondFragment_onDestroyView");
}
@Override
public void onDestroy() {
super.onDestroy();
System.out.println("SecondFragment_onDestroy");
}
@Override
public void onDetach() {
super.onDetach();
System.out.println("SecondFragment_onDetach");
}
}
fragment_second.xml
<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="com.s3abiscuit.android.testfragment.SecondFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这是secondFragment"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_goto_firstfragment"
android:text="跳转到firstFragment"/>
</LinearLayout>
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