转自 https://www.cnblogs.com/labixiaoxin/p/4981444.html

在Fragment的生命周期中，需要重点关注onCreate、onCreateView、onViewCreated。Activity与Fragment生命周期在设计模式上大体一致。

1 package com.lixu.fragment_test; 2
3 import android.app.Activity; 4
5 import android.app.FragmentManager; 6 import android.app.FragmentTransaction; 7 import android.os.Bundle; 8 import android.view.View; 9 import android.view.View.OnClickListener; 10 import android.view.Window; 11 import android.widget.ImageView; 12
13 public class MainActivity extends Activity implements OnClickListener { 14
15 @Override 16 protected void onCreate(Bundle savedInstanceState) { 17 super.onCreate(savedInstanceState); 18 requestWindowFeature(Window.FEATURE_NO_TITLE); 19 setContentView(R.layout.activity_main); 20 //设置初始界面为“微信”。
21 getweixn(); 22
23 ImageView iv1 = (ImageView) findViewById(R.id.iv1); 24 ImageView iv2 = (ImageView) findViewById(R.id.iv2); 25 ImageView iv3 = (ImageView) findViewById(R.id.iv3); 26 ImageView iv4 = (ImageView) findViewById(R.id.iv4); 27
28 iv1.setOnClickListener(this); 29 iv2.setOnClickListener(this); 30 iv3.setOnClickListener(this); 31 iv4.setOnClickListener(this); 32
33 } 34
35 public void getweixn() { 36 FragmentManager fm = this.getFragmentManager(); 37 FragmentTransaction ft = fm.beginTransaction(); 38 // 将原有的Activity替换成Fragment。也可以添加到原有之上不替换 如：ft.add(R.id.rel, new 39 // Fragment()) ;如果添加的多了会比较耗资源。
40 ft.replace(R.id.fl, new MyFragment1()); 41 // 提交
42 ft.commit(); 43
44 } 45
46 public void gettongxunlu() { 47 //设置Fragment管理器
48 FragmentManager fm = this.getFragmentManager(); 49 FragmentTransaction ft = fm.beginTransaction(); 50
51 ft.replace(R.id.fl, new MyFragment2()); 52
53 ft.commit(); 54
55 } 56
57 public void getfaxian() { 58 FragmentManager fm = this.getFragmentManager(); 59 FragmentTransaction ft = fm.beginTransaction(); 60
61 ft.replace(R.id.fl, new MyFragment3()); 62
63 ft.commit(); 64
65 } 66
67 public void getwo() { 68 FragmentManager fm = this.getFragmentManager(); 69 FragmentTransaction ft = fm.beginTransaction(); 70
71 ft.replace(R.id.fl, new MyFragment4()); 72
73 ft.commit(); 74
75 } 76
77 @Override 78 public void onClick(View v) { 79 switch (v.getId()) { 80 case R.id.iv1: 81 getweixn(); 82 break; 83 case R.id.iv2: 84 gettongxunlu(); 85 break; 86 case R.id.iv3: 87 getfaxian(); 88 break; 89 case R.id.iv4: 90 getwo(); 91 break; 92
93 default: 94 break; 95 } 96 } 97
98 }

1 package com.lixu.fragment_test; 2
3
4 import android.app.Fragment; 5 import android.os.Bundle; 6
7 import android.view.LayoutInflater; 8 import android.view.View; 9 import android.view.ViewGroup; 10 import android.widget.ImageView; 11
12 class MyFragment1 extends Fragment { 13
14 @Override 15 public void onCreate(Bundle savedInstanceState) { 16 super.onCreate(savedInstanceState); 17 } 18
19 // 创建view 也可以直接在这里面获取view中的控件。
20 @Override 21 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 22
23 View view = inflater.inflate(R.layout.image, null); 24
25 return view; 26 } 27
28 // 创建view完毕 可以直接在onCreateView中获取view中控件。
29 @Override 30 public void onViewCreated(View view, Bundle savedInstanceState) { 31 super.onViewCreated(view, savedInstanceState); 32
33 ImageView iv = (ImageView) view.findViewById(R.id.iv); 34 iv.setImageResource(R.drawable.weixinjiemian); 35 } 36 }

1 package com.lixu.fragment_test; 2
3 import java.util.ArrayList; 4 import java.util.HashMap; 5
6 import android.app.Fragment; 7 import android.content.Context; 8 import android.graphics.Color; 9 import android.os.Bundle; 10
11 import android.view.LayoutInflater; 12 import android.view.View; 13 import android.view.ViewGroup; 14 import android.widget.ArrayAdapter; 15 import android.widget.ListView; 16 import android.widget.TextView; 17
18 class MyFragment2 extends Fragment { 19 private static final String TYPE = "type";
20 private static final String DATE = "date";
21 private static final int GROUP = -1;
22 private static final int ITEM = -2;
23
24 private ArrayList> item = null;
25
26 @Override
27 public void onCreate(Bundle savedInstanceState) { 28 super.onCreate(savedInstanceState);
29
30 }
31
32 // 创建view
33 @Override
34 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 35
36 View view = inflater.inflate(R.layout.list, null);
37
38 return view; 39 }
40
41 // 创建view完毕
42 @Override
43 public void onViewCreated(View view, Bundle savedInstanceState) { 44 super.onViewCreated(view, savedInstanceState);
45
46 ListView lv = (ListView) view.findViewById(R.id.lv); 47 MyAdaper adapter = new MyAdaper(getActivity(), -1);
48
49 item = new ArrayList>();
50
51 String[] groups = { "家人", "朋友", "同学", "同事" }; 52 String[] date = { "张三", "李四", "王五", "狗儿" }; 53 for (String str : groups) { 54 HashMap group_map = new HashMap();
55
56 group_map.put(TYPE, GROUP);
57 group_map.put(DATE, str);
58 item.add(group_map);
59 for (String n : date) { 60
61 HashMap date_map = new HashMap();
62
63 date_map.put(TYPE, ITEM);
64 date_map.put(DATE, n);
65 item.add(date_map);
66
67 }
68
69 }
70 lv.setAdapter(adapter);
71 }
72
73 private class MyAdaper extends ArrayAdapter { 74 private LayoutInflater flater = null;
75 private Context context; 76
77 public MyAdaper(Context context, int resource) { 78 super(context, resource);
79 this.context = context; 80 flater = LayoutInflater.from(context); 81 }
82
83 @Override
84 public int getCount() { 85 return item.size(); 86 }
87
88 @Override
89 public int getItemViewType(int position) { 90 HashMap map = item.get(position); 91 return (Integer) map.get(TYPE); 92 }
93
94 @Override
95 public int getViewTypeCount() { 96
97 return 2;
98 }
99
100 @Override 101 public View getView(int position, View convertView, ViewGroup parent) { 102 int type = getItemViewType(position); 103 // 根据不同的view type加载不同的布局文件。
104 switch (type) { 105 case GROUP: 106
107 convertView = flater.inflate(android.R.layout.simple_list_item_1, null); 108 TextView tv1 = (TextView) convertView.findViewById(android.R.id.text1); 109 tv1.setText(item.get(position).get(DATE) + ""); 110 tv1.setBackgroundColor(Color.RED); 111 tv1.setTextSize(20); 112
113 break; 114 case ITEM: 115 convertView = flater.inflate(android.R.layout.simple_list_item_1, null); 116 TextView tv2 = (TextView) convertView.findViewById(android.R.id.text1); 117 tv2.setText(item.get(position).get(DATE) + ""); 118
119 break; 120
121 default: 122 break; 123 } 124
125 return convertView; 126 } 127
128 } 129 }

1 package com.lixu.fragment_test; 2
3
4 import android.app.Fragment; 5 import android.os.Bundle; 6
7 import android.view.LayoutInflater; 8 import android.view.View; 9 import android.view.ViewGroup; 10 import android.widget.ImageView; 11
12 class MyFragment3 extends Fragment { 13
14 @Override 15 public void onCreate(Bundle savedInstanceState) { 16 super.onCreate(savedInstanceState); 17 } 18
19 // 创建view
20 @Override 21 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 22
23 View view = inflater.inflate(R.layout.image, null); 24
25 return view; 26 } 27
28 // 创建view完毕
29 @Override 30 public void onViewCreated(View view, Bundle savedInstanceState) { 31 super.onViewCreated(view, savedInstanceState); 32
33 ImageView iv = (ImageView) view.findViewById(R.id.iv); 34 iv.setImageResource(R.drawable.faxianjiemian); 35 } 36 }

1 package com.lixu.fragment_test; 2
3
4 import android.app.Fragment; 5 import android.os.Bundle; 6
7 import android.view.LayoutInflater; 8 import android.view.View; 9 import android.view.ViewGroup; 10 import android.widget.ImageView; 11
12 class MyFragment4 extends Fragment { 13
14 @Override 15 public void onCreate(Bundle savedInstanceState) { 16 super.onCreate(savedInstanceState); 17 } 18
19 // 创建view
20 @Override 21 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 22
23 View view = inflater.inflate(R.layout.image, null); 24
25 return view; 26 } 27
28 // 创建view完毕
29 @Override 30 public void onViewCreated(View view, Bundle savedInstanceState) { 31 super.onViewCreated(view, savedInstanceState); 32
33 ImageView iv = (ImageView) view.findViewById(R.id.iv); 34 iv.setImageResource(R.drawable.wojiemian); 35 } 36 }

xml文件：

1
8
9
14 15 16
21
22
28
29
35
36
42
43
49 </LinearLayout>
50
51 </LinearLayout>

1
2
6
7 </ImageView>

1
2
6
7
11 </ListView>
12
13 </LinearLayout>

运行效果图，演示为主，效果为辅，图片有点不真实，哈哈。