26. Fragment生命周期

26.1 Fragment生命周期

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onAttach()/onDetach()：绑定/解绑

onCreate()/onDestroy()：创建/销毁

创建时，解析bundle

onCreateView()/onDestroyView()：对UI的创建/销毁

onActivityCreated()：意味着Activity已经创建

onStart()/onStop()：启动/停止

onResume()/onPause：恢复/暂停

26.2 代码感受fragment生命周期
package com.dingjiaxiong.myfragmentmanagers;

import android.content.Context;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

public class BlankFragment1 extends Fragment {

private View rootView;

public BlankFragment1() {
// Required empty public constructor
}

private IFragmentCallBack fragmentCallBack;
public void setFragmentCallBack(IFragmentCallBack callBack){
fragmentCallBack = callBack;
}

//绑定
@Override
public void onAttach(@NonNull Context context) {
super.onAttach(context);
Log.e("dingjiaxiong", "onAttach: ");
}

//创建
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

//获取bundle
Bundle bundle = this.getArguments();
//获取数据
String s = bundle.getString("message");
Log.e("dingjiaxiong", "onCreate: " + s);

Log.e("dingjiaxiong", "onCreate: ");

}

//创建UI
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment

if(rootView == null){
rootView = inflater.inflate(R.layout.fragment_blank1, container, false);
}
Button button = rootView.findViewById(R.id.btn3);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// fragmentCallBack.sendMsgToActivity("Hello,我来自fragment");

String msg = fragmentCallBack.getMsgFromActivity("null");
Toast.makeText(BlankFragment1.this.getContext(),msg,Toast.LENGTH_SHORT).show();

}
});
Log.e("dingjiaxiong", "onCreateView: ");
return rootView;
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Log.e("dingjiaxiong", "onActivityCreated: ");
}

@Override
public void onStart() {
super.onStart();
Log.e("dingjiaxiong", "onStart: ");
}

@Override
public void onResume() {
super.onResume();
Log.e("dingjiaxiong", "onResume: ");
}

@Override
public void onPause() {
super.onPause();
Log.e("dingjiaxiong", "onPause: " );
}

@Override
public void onStop() {
super.onStop();
Log.e("dingjiaxiong", "onStop: " );
}

@Override
public void onDestroyView() {
super.onDestroyView();
Log.e("dingjiaxiong", "onDestroyView: " );
}

@Override
public void onDestroy() {
super.onDestroy();
Log.e("dingjiaxiong", "onDestroy: " );
}

@Override
public void onDetach() {
super.onDetach();
Log.e("dingjiaxiong", "onDetach: " );
}
}

每个生命周期中都打印一个日志

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