作者：跑不快的码 | 来源：互联网 | 2023-05-21 07:46
在Fragment中，几个主要生命周期的创建过程
onCreate 创造页面
onCreateView 创造View
onStart 开始
三种获取LayoutInflater的方式
LayoutInflater inflater=LayoutInflater.from(getContext());
LayoutInflater inflater=getLayoutInflater();
LayoutInflater localinflater =
(LayoutInflater)context.getSystemService（Context.LAYOUT_INFLATER_SERVICE);
其中的onCreate负责创建Fragment的View，必须要进行重写
将页面的初始化放在onCreateView中
示例代码：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
Log.d("TAG","onCreateView");
//创建界面MsgFragment
cOntentView=inflater.inflate(R.layout.fragment_msg,container,false);
//界面的初始化
myListAdapter=new MyListAdapter();
ListView listView=(ListView)contentView.findViewById(R.id.id_listview_msgfragment);
listView.setAdapter(myListAdapter);
return contentView;
}
重写方法onStart()
@Override
public void onStart() {
Log.d("TAG","onStart");
demo();
super.onStart();
}
/////////////////////添加数据
private void demo()
{
listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
}
MsgFragment.java
1 package com.example.senior0302_test2;
2
3
4 import android.os.Bundle;
5 import android.support.annotation.Nullable;
6 import android.support.v4.app.Fragment;
7 import android.util.Log;
8 import android.view.LayoutInflater;
9 import android.view.View;
10 import android.view.ViewGroup;
11 import android.widget.BaseAdapter;
12 import android.widget.ListView;
13 import android.widget.TextView;
14
15 import java.util.ArrayList;
16
17
18 /**
19 * A simple {@link Fragment} subclass.
20 */
21 public class MsgFragment extends Fragment {
22
23 ArrayListlistData=new ArrayList<>();
24 MyListAdapter myListAdapter;
25 View contentView;
26
27
28
29
30 public MsgFragment() {
31
32 }
33
34 @Override
35 public void onStart() {
36 Log.d("TAG","onStart");
37 demo();
38 super.onStart();
39 }
40 /////////////////////添加数据
41 private void demo()
42 {
43 listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
44 listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
45 listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
46 listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
47 listData.add(new Con("日前,国家卫健委有关负责人表示,我国正采取多"));
48 }
49
50 @Override
51 public void onCreate(@Nullable Bundle savedInstanceState) {
52 Log.d("TAG","onCreate");
53 super.onCreate(savedInstanceState);
54 }
55
56 @Override
57 public View onCreateView(LayoutInflater inflater, ViewGroup container,
58 Bundle savedInstanceState)
59 {
60 Log.d("TAG","onCreateView");
61 //创建界面MsgFragment
62 cOntentView=inflater.inflate(R.layout.fragment_msg,container,false);
63
64 //界面的初始化
65 myListAdapter=new MyListAdapter();
66 ListView listView=(ListView)contentView.findViewById(R.id.id_listview_msgfragment);
67 listView.setAdapter(myListAdapter);
68 return contentView;
69
70 }
71
72 /////////////////////该有的数据
73 public class Con
74 {
75 public String content;
76 public Con(String content)
77 {
78 this.cOntent=content;
79 }
80 }
81 /////////////////////适配器
82 public class MyListAdapter extends BaseAdapter
83 {
84
85 @Override
86 public int getCount() {
87 return listData.size();
88 }
89
90 @Override
91 public Object getItem(int position) {
92 return listData.get(position);
93 }
94
95 @Override
96 public long getItemId(int position) {
97 return position;
98 }
99
100 @Override
101 public View getView(int position, View converView, ViewGroup parent) {
102
103 if(cOnverView==null)
104 {
105 cOnverView=getLayoutInflater().inflate(R.layout.layout_fragment_msg,parent,false);
106 }
107 Con c= (Con) getItem(position);
108 TextView textView=(TextView)converView.findViewById(R.id.id_textview_msgfragment);
109 textView.setText(c.content);
110
111 return converView;
112 }
113 }
114
115 }
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