Android——Fragment和Activity之间的通信+Frangment生命周期
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Android——Fragment和Activity之间的通信+Frangment生命周期
Fr'agment和Activity之间的通信
1.在Fragment中声明一个接口。
2.在Activity中实现在Fargment中声明的接口。
3.在Fragment中声明一个接口对象。
4.在Frangment的生命周期Onattach方法中判断当前Activity是否实现了此Fragment中声明的接口。如果已实现，就把当前Activity转换成接口对象。
5.调用Activity中实现的方法=>（接口对象.方法名）
package com.example.jreduch05;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v7.app.AppCompatActivity;import com.example.jreduch05.fragment.FirstFragment;import com.example.jreduch05.fragment.LeftFragment;import com.example.jreduch05.fragment.SecondFragment;public class Fragment1Activity extends AppCompatActivity implements LeftFragment.OnFragmentInteractionListener{ private Fragment fragment1; private Fragment fragment2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_fragment1); getSupportActionBar().hide(); } @Override public void changeFragment(int which) { if (which==1){ fragment1=new FirstFragment(); getSupportFragmentManager() .beginTransaction() .replace(R.id.fl,fragment1) .commit(); }else if (which==2){ fragment2=new SecondFragment(); getSupportFragmentManager() .beginTransaction() .replace(R.id.fl,fragment2) .commit(); } else if (which==3){ if(fragment2!=null && !fragment2.isHidden()){ getSupportFragmentManager().beginTransaction() .hide(fragment2).commit(); } } else if (which==4){ if(fragment2!=null && fragment2.isHidden()){ getSupportFragmentManager().beginTransaction() .show(fragment2).commit(); } } }}<?xml version="1.0" encoding="utf-8"?><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.jreduch05.Fragment1Activity"><fragment android:layout_width="match_parent" android:layout_height="120dp" android:id="@+id/top" android:name="com.example.jreduch05.fragment.TopFragment" ></fragment> <fragment android:layout_width="150dp" android:layout_height="match_parent" android:id="@+id/left" android:name="com.example.jreduch05.fragment.LeftFragment" android:layout_alignTop="@+id/fl" android:layout_alignParentStart="true"></fragment> <!--<fragment--> <!--android:layout_width="250dp"--> <!--android:layout_height="match_parent"--> <!--android:id="@+id/main"--> <!--android:name="com.example.jreduch05.fragment.MainFragment"--> <!--android:layout_below="@+id/top"--> <!--android:layout_alignParentEnd="true"></fragment>--> <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/fl" android:layout_below="@+id/top" android:layout_toEndOf="@+id/left"> </FrameLayout></RelativeLayout>LeftFragment
package com.example.jreduch05.fragment;import android.content.Context;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import com.example.jreduch05.R;/** * A simple {@link Fragment} subclass. */public class LeftFragment extends Fragment {private Fragment fragment1; private Fragment fragment2; private OnFragmentInteractionListener mListener; public LeftFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment View view= inflater.inflate(R.layout.fragment_left2, container, false); Button bt1=(Button)view.findViewById(R.id.bt1); Button bt2=(Button)view.findViewById(R.id.bt2); Button bt3=(Button)view.findViewById(R.id.bt3); Button bt4=(Button)view.findViewById(R.id.bt4); Button bt5=(Button)view.findViewById(R.id.bt5); Button bt6=(Button)view.findViewById(R.id.bt6); Button bt7=(Button)view.findViewById(R.id.bt7); Button bt8=(Button)view.findViewById(R.id.bt8); bt1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { //Toast.makeText(getContext(),"点击按钮1",Toast.LENGTH_SHORT).show(); fragment1=new FirstFragment(); FragmentManager fm=getFragmentManager(); FragmentTransaction fr=fm.beginTransaction(); //开始 fr.replace(R.id.fl,fragment1); //替换 fr.commit();//提交一个事物 } }); bt2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { //Toast.makeText(getContext(),"点击按钮1",Toast.LENGTH_SHORT).show(); fragment2=new SecondFragment(); FragmentManager fm=getFragmentManager(); FragmentTransaction fr=fm.beginTransaction(); //开始 fr.replace(R.id.fl,fragment2); //替换 fr.commit();//提交一个事物 } }); bt3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { mListener.changeFragment(1); } }); bt4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { mListener.changeFragment(2); } }); bt5.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(fragment1!=null && !fragment1.isHidden()){ getFragmentManager().beginTransaction() .hide(fragment1).commit(); } } }); bt6.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if(fragment1!=null && fragment1.isHidden()){ getFragmentManager().beginTransaction() .show(fragment1).commit(); } } }); bt7.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mListener.changeFragment(3); } }); bt8.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mListener.changeFragment(4); } }); return view; } public interface OnFragmentInteractionListener { // TODO: Update argument type and name void changeFragment(int which); } @Override public void onAttach(Context context) { super.onAttach(context); if (context instanceof OnFragmentInteractionListener) { mListener = (OnFragmentInteractionListener) context; } else { throw new RuntimeException(context.toString() + " must implement OnFragmentInteractionListener"); } }}<FrameLayout 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:background="#0c04f7" tools:context="com.example.jreduch05.fragment.LeftFragment"> <!-- TODO: Update blank fragment layout --> <!--<TextView--> <!--android:layout_width="match_parent"--> <!--android:layout_height="match_parent"--> <!--android:background="#0c04f7"--> <!--android:id="@+id/left"--> <!--android:text="leftfragment"--> <!--android:textSize="30sp"--> <!--android:gravity="center"/>--> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第一个Fragment" android:id="@+id/bt1" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第二个Fragment" android:id="@+id/bt2" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第一个Fragment\n(Activity通信)" android:id="@+id/bt3" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="第二个Fragment\n(Activity通信)" android:id="@+id/bt4" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="隐藏Fragment1" android:id="@+id/bt5" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="显示Fragment1" android:id="@+id/bt6"/> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="隐藏Fragment2\n(Activity通信)" android:id="@+id/bt7" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="显示Fragment2\n(Activity通信)" android:id="@+id/bt8"/> </LinearLayout></FrameLayout>
FirstFragment
package com.example.jreduch05.fragment;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;import android.widget.TextView;import com.example.jreduch05.R;/** * A simple {@link Fragment} subclass. */public class FirstFragment extends Fragment { public FirstFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_first, container, false); } @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); Bundle bundle=getArguments(); if(bundle!=null){ int ch= bundle.getInt("channel") ; TextView tv= (TextView) getView().findViewById(R.id.tv); tv.setText(ch+""); } }}<FrameLayout 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.jreduch05.fragment.FirstFragment"> <!-- TODO: Update blank fragment layout --> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="我是fragment1" android:textSize="30sp"android:id="@+id/tv" android:gravity="center"/></FrameLayout>
SecondFragment
package com.example.jreduch05.fragment;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import com.example.jreduch05.R;/** * A simple {@link Fragment} subclass. */public class SecondFragment extends Fragment { public SecondFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_second, container, false); }}<FrameLayout 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.jreduch05.fragment.SecondFragment"> <!-- TODO: Update blank fragment layout --> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:text="我是fragment2" android:textSize="30sp" android:gravity="center"/></FrameLayout>MainFragment
package com.example.jreduch05.fragment;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import com.example.jreduch05.R;/** * A simple {@link Fragment} subclass. */public class MainFragment extends Fragment { public MainFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_main, container, false); }}<FrameLayout 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.jreduch05.fragment.MainFragment"> <!-- TODO: Update blank fragment layout --> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:background="#f7ef04" android:id="@+id/main" android:text="Mainfragment" android:textSize="30sp" android:gravity="center"/></FrameLayout>TopFargment
package com.example.jreduch05.fragment;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import com.example.jreduch05.R;/** * A simple {@link Fragment} subclass. */public class TopFragment extends Fragment { public TopFragment() { // Required empty public constructor } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment return inflater.inflate(R.layout.fragment_top, container, false); }}<FrameLayout 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.jreduch05.fragment.TopFragment"> <!-- TODO: Update blank fragment layout --> <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:background="#f50f0f" android:text="Topfragment" android:textSize="30sp" android:id="@+id/top" android:gravity="center"/></FrameLayout>
Frangment生命周期
方法名 说明
onAttach () Fragment被附加到Activity的时，调用此函数，在这个方法中可以获得宿主Activity。
onCreate () Fragment被创建的时，调用此函数。
onCreateView () Fragment的布局加载时，调用此函数。
onActivityCreated () 当宿主Activity启动完毕后，调用此函数。
onStart () 启动Fragment时，调用此函数。
onResume () Fragment恢复时，调用此函数。
onPause () Fragment暂停时，调用此函数。
onStop() Fragment停止时，调用此函数。
onDestroyView() 销毁Fragment中的View控件时，调用此函数。
onDestroy() 销毁Fragment时，调用此函数。
onDetach() Fragment从Activity脱离时，调用此函数
启动
Remove
回退
3键
<span style="font-size:18px;">package com.example.jreduch05;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.View;import android.widget.Button;import com.example.jreduch05.fragment.FirstFragment;import com.example.jreduch05.fragment.LifeFragment;public class FragmentLifeActivity extends AppCompatActivity { //private Fragment fragment; private Fragment fragment2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_fragment_life); final Fragment fragment=new LifeFragment(); Button bt1=(Button)findViewById(R.id.bt_remove); Button bt2=(Button)findViewById(R.id.bt_replace); Button bt3=(Button)findViewById(R.id.bt_hide); Button bt4=(Button)findViewById(R.id.bt_show); Button bt5=(Button)findViewById(R.id.bt_remrep); bt1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (fragment!=null){ getSupportFragmentManager().beginTransaction() .remove(fragment).commit(); } } }); bt2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (fragment!=null){ fragment2=new FirstFragment(); Bundle bundle=new Bundle(); bundle.putInt("channel",1261911); fragment2.setArguments(bundle); getSupportFragmentManager().beginTransaction() .replace(R.id.life_frame, fragment2).commit(); } } }); bt3.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (fragment!=null&&!fragment.isHidden()){ getSupportFragmentManager().beginTransaction() .hide(fragment).commit(); } } }); bt4.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (fragment!=null&&fragment.isHidden()){ getSupportFragmentManager().beginTransaction() .show(fragment).commit(); } } }); bt5.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (fragment2!=null){ getSupportFragmentManager().beginTransaction() .remove(fragment2).commit(); } } }); getSupportFragmentManager() .beginTransaction() .replace(R.id.life_frame, fragment) .commit(); Log.d("====Activity==", "onCreate"); } @Override protected void onStart() { super.onStart(); Log.d("====Activity==", "onStart"); } @Override protected void onRestart() { super.onRestart(); Log.d("====Activity==", "onRestart"); } @Override protected void onResume() { super.onResume(); Log.d("====Activity==", "onRestart"); } @Override protected void onPause() { super.onPause(); Log.d("====Activity==", "onPause"); } @Override protected void onStop() { super.onStop(); Log.d("====Activity==", "onStop"); } @Override protected void onDestroy() { super.onDestroy(); Log.d("====Activity==", "onDestroy"); }}</span><?xml version="1.0" encoding="utf-8"?><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.jreduch05.FragmentLifeActivity"> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/bt_remove" android:text="Remove Fragment" android:gravity="center"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/bt_replace" android:text="Replace Fragment" android:layout_below="@+id/bt_remove" android:gravity="center"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/bt_hide" android:layout_below="@+id/bt_replace" android:text="Hide Fragment" android:gravity="center"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/bt_hide" android:id="@+id/bt_show" android:text="Show Fragment" android:gravity="center"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@+id/bt_show" android:id="@+id/bt_remrep" android:text="removereplace" android:gravity="center"/> <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/life_frame" android:layout_below="@+id/bt_remrep"> </FrameLayout></RelativeLayout>
作者：冲天之峰 20160808
3 0
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