Android——ListView相关作业
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内容图文
给ListVlew提供点击按钮添加新数据，单击项目修改，长按删除功能
layout文件：
1
<?
xml version="1.0" encoding="utf-8"
?>
2
<
LinearLayout
xmlns:android
="http://schemas.android.com/apk/res/android"
3
xmlns:tools
="http://schemas.android.com/tools"
4
android:layout_width
="match_parent"
5
android:layout_height
="match_parent"
6
android:paddingBottom
="@dimen/activity_vertical_margin"
7
android:paddingLeft
="@dimen/activity_horizontal_margin"
8
android:paddingRight
="@dimen/activity_horizontal_margin"
9
android:paddingTop
="@dimen/activity_vertical_margin"
10
tools:context
="com.hanqi.testapp2.PractiseActivity7"
11
android:orientation
="vertical"
>
12
13
<
GridView
14
android:layout_width
="match_parent"
15
android:layout_height
="wrap_content"
16
android:id
="@+id/gv_1"
17
android:numColumns
="4"
18
android:stretchMode
="columnWidth"
19
android:gravity
="center"
20
android:horizontalSpacing
="30dp"
></
GridView
>
21
<
Button
22
android:layout_width
="wrap_content"
23
android:layout_height
="wrap_content"
24
android:text
="点击添加"
25
android:onClick
="bt_tj_onClick"
/>
26
</
LinearLayout
>
java类：
1
package
com.hanqi.testapp2;
2
3
import
android.app.AlertDialog;
4
import
android.content.DialogInterface;
5
import
android.os.Bundle;
6
import
android.support.v7.app.AppCompatActivity;
7
import
android.view.LayoutInflater;
8
import
android.view.View;
9
import
android.view.ViewGroup;
10
import
android.widget.AdapterView;
11
import
android.widget.BaseAdapter;
12
import
android.widget.GridView;
13
import
android.widget.ImageView;
14
import
android.widget.TextView;
15
import
android.widget.Toast;
16
17
import
java.util.ArrayList;
18
import
java.util.List;
19
20
public
class PractiseActivity7 extends AppCompatActivity {
21 22 GridView gv_1;
23 List<MyClass> liv;
24 TextView tv_3;
25 ImageView iv_3;
26 @Override
27protectedvoid onCreate(Bundle savedInstanceState) {
28super.onCreate(savedInstanceState);
29 setContentView(R.layout.activity_practise7);
30 gv_1 = (GridView)findViewById(R.id.gv_1);
31 tv_3 = (TextView)findViewById(R.id.tv_3);
32 iv_3 = (ImageView)findViewById(R.id.iv_3);
33 34//1、数据 图片的id 35 liv = new ArrayList<>();
36 MyClass myClass = new MyClass(R.drawable.f1,"美食1的介绍");
37 liv.add(myClass);
38 liv.add(new MyClass(R.drawable.f2,"美食2的介绍"));
39 liv.add(new MyClass(R.drawable.f3,"美食3的介绍"));
40 liv.add(new MyClass(R.drawable.f4,"美食4的介绍"));
41 liv.add(new MyClass(R.drawable.f5,"美食5的介绍"));
42 liv.add(new MyClass(R.drawable.f6,"美食6的介绍"));
43 liv.add(new MyClass(R.drawable.f7,"美食7的介绍"));
44 liv.add(new MyClass(R.drawable.f8, "美食8的介绍"));
45final ImageAdapter imageAdapter = new ImageAdapter();
46 {
47 gv_1.setAdapter(imageAdapter);
48 }
49 50 gv_1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
51 @Override
52publicvoid onItemClick(AdapterView<?> parent, View view, int position, long id) {
53 54 }
55 });
56 57 gv_1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
58 @Override
59publicboolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
60 61//1.删除数据
62//从集合里删除长按的数据 63 liv.remove(position);
64//2.刷新视图，看到效果
65//通知适配器，数据源改变 66 imageAdapter.notifyDataSetChanged();
67 Toast.makeText(PractiseActivity7.this, "删除了记录索引 = " + position, Toast.LENGTH_SHORT).show();
68returntrue;//事件已经被消费，不要再处理了 69 }
70 });
71 }
72publicvoid bt_tj_onClick(View v)
73 {
74 LayoutInflater layoutInflater = getLayoutInflater();
75 View view = layoutInflater.inflate(R.layout.activity_practise7_1, null);
76new AlertDialog.Builder(this)
77 .setTitle("添加的内容")
78 .setPositiveButton("确定", new DialogInterface.OnClickListener() {
79 @Override
80publicvoid onClick(DialogInterface dialog, int which) {
81 liv.add(new MyClass(R.drawable.f9, "美食9的介绍"));
82 ImageAdapter imageAdapter = new ImageAdapter();
83 {
84 gv_1.setAdapter(imageAdapter);
85 }
86 87 }
88 })
89 .setView(view)
90 .show();
91 }
92class MyClass
93 {
94privateint img;
95private String content;
96 97publicint getImg() {
98return img;
99 }
100101publicvoid setImg(int img) {
102this.img = img;
103 }
104105public String getContent() {
106return content;
107 }
108109publicvoid setContent(String content) {
110this.content = content;
111 }
112public MyClass(int img,String content)
113 {
114this.img = img;
115this.content = content;
116 }
117 }
118//适配器119class ImageAdapter extends BaseAdapter
120 {
121 @Override
122publicint getCount() {
123return liv.size();
124 }
125126 @Override
127public Object getItem(int position) {
128return liv.get(position);
129 }
130131 @Override
132publiclong getItemId(int position) {
133return 0;
134 }
135136 @Override
137public View getView(int position, View convertView, ViewGroup parent) {
138//1.得到数据 图片的id139 MyClass myClass = liv.get(position);
140//2.准备View141if (convertView ==null) {
142 convertView = View.inflate(PractiseActivity7.this, R.layout.gridview_layout, null);
143 }
144//3.适配
145//转换146 ImageView imageView = (ImageView)convertView.findViewById(R.id.iv_3);
147 imageView.setImageResource(myClass.getImg());
148149 TextView textView = (TextView)convertView.findViewById(R.id.tv_3);
150 textView.setText(myClass.getContent());
151152return convertView;
153 }
154 }
155 }
效果为：
修改功能还未做出来，而且目前有BUG，仍在调试中
原文：http://www.cnblogs.com/hanazawalove/p/5518690.html
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