关于listview视图的 作业

代码运行目录

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.administrator.testapp">

     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity android:name=".MainActivity" />
         <activity android:name=".test_activity6" />
         <activity android:name=".TestActivity7" />
         <activity android:name=".TestActivity8" />
         <activity android:name=".Main2Activity" />
         <activity android:name=".TestActivity9" />
         <activity android:name=".TestActivity10" />
         <activity android:name=".TestActivity11">
         </activity>
         <activity android:name=".TsetActivity12">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
     </application>

 </manifest>

布局文件

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
     <ImageView
         android:layout_width="70dp"
         android:layout_height="70dp"
         android:id="@+id/iv_1"/>
     <TextView
         android:layout_width="70dp"
         android:layout_height="wrap_content"
         android:gravity="center"
         android:id="@+id/tv_1"/>
 </LinearLayout>

表格布局文件

 <?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"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context="com.example.wang.myapplication.Main2Activity">
     <GridView
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:id="@+id/gv_1"
         android:numColumns="4"
         android:gravity="center"
         android:horizontalSpacing="20dp">
     </GridView>
 </RelativeLayout>

自定义对话框布局文件

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:orientation="vertical"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

     <EditText
         android:layout_width="match_parent"
         android:layout_height="50dp"
         android:layout_marginTop="5dp"
         android:gravity="center"
         android:hint="请从f1~f10中选择一张图"
         android:id="@+id/et_2" />
     <EditText
         android:layout_width="match_parent"
         android:layout_height="50dp"
         android:layout_marginTop="5dp"
         android:gravity="center"
         android:hint="请给图片命名"
         android:id="@+id/et_1" />
 </LinearLayout>

JAVA运行程序

 package com.example.administrator.testapp;

 import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.os.Bundle;
 import android.support.v7.app.AppCompatActivity;
 import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.BaseAdapter;
 import android.widget.EditText;
 import android.widget.GridView;
 import android.widget.ImageView;
 import android.widget.TextView;
 import android.widget.Toast;

 import java.util.ArrayList;
 import java.util.List;

 public class TsetActivity12 extends AppCompatActivity {

     GridView gv_1;
     List<MyClass> lm;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main2);

         gv_1=(GridView)findViewById(R.id.gv_1);

         lm=new ArrayList<MyClass>();

         MyClass myClass=new MyClass(R.drawable.f1,"名称1");

         lm.add(myClass);
         lm.add(new MyClass(R.drawable.f2,"名称2"));

         lm.add(new MyClass(R.drawable.f3,"名称3"));

         lm.add(new MyClass(R.drawable.f4,"名称4"));

         lm.add(new MyClass(R.drawable.f5,"名称5"));

         lm.add(new MyClass(R.drawable.f6,"名称6"));

         lm.add(new MyClass(R.drawable.f7,"名称7"));

         lm.add(new MyClass(R.drawable.f8,"名称8"));

         lm.add(new MyClass(R.drawable.f9,"名称9"));

         final GridAdapter gridAdapter=new GridAdapter();

         gv_1.setAdapter(gridAdapter);

         gv_1.setOnItemClickListener(new AdapterView.OnItemClickListener() {

             @Override
             public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {

                 final View view1=View.inflate(TsetActivity12.this, R.layout.activity_main4, null);

                 new AlertDialog.Builder(TsetActivity12.this)
                         .setView(view1)
                         .setNegativeButton("添加", new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {

                                 EditText et_1=(EditText)view1.findViewById(R.id.et_1);

                                 String str12=et_1.getText().toString();

                                 if (str12.length()>=5||str12.trim().length()==0)
                                 {
                                     Toast.makeText(TsetActivity12.this, "不符合命名规则，请重新命名",
                                             Toast.LENGTH_SHORT).show();

                                     return;
                                 }

                                 EditText et_2=(EditText)view1.findViewById(R.id.et_2);

                                 String str22=et_2.getText().toString();

                                 String a="a",aa="aa",aaa="aaa",aaaa="aaaa";

                                 if (str22.equals(a))
                                 {
                                     lm.add(new MyClass(R.drawable.f1,str12));
                                 }
                                 else if (str22.equals(aa))
                                 {
                                     lm.add(new MyClass(R.drawable.f2,str12));
                                 }
                                 else if (str22.equals(aaa))
                                 {
                                     lm.add(new MyClass(R.drawable.f3,str12));
                                 }
                                 else if (str22.equals(aaaa))
                                 {
                                     lm.add(new MyClass(R.drawable.f4,str12));
                                 }
                                 else
                                 {
                                     Toast.makeText(TsetActivity12.this, "请从a,aa,aaa,aaaa中选择",
                                             Toast.LENGTH_SHORT).show();
                                 }

                                 gridAdapter.notifyDataSetChanged();
                             }
                         })
                         .setNeutralButton("取消",null)
                         .setPositiveButton("修改", new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
                                 MyClass myClass = lm.get(position);

                                 EditText et_1 = (EditText) view1.findViewById(R.id.et_1);

                                 String str12 = et_1.getText().toString();

                                 if (str12.length() >= 5) {
                                     Toast.makeText(TsetActivity12.this, "不符合命名规则，请重新命名",
                                             Toast.LENGTH_SHORT).show();
                                     return;
                                 }

                                 EditText et_2 = (EditText) view1.findViewById(R.id.et_2);

                                 String str22 = et_2.getText().toString();

                                 String a = "a", aa = "aa", aaa = "aaa", aaaa = "aaaa";

                                 if (str22.equals(a)) {
                                     if (str12.length() == 0) {
                                         myClass.setImg(R.drawable.f1);//只修改图片
                                     } else {
                                         myClass.setImg(R.drawable.f1);
                                         myClass.setName(str12);
                                     }
                                 } else if (str22.equals(aa)) {
                                     if (str12.length() == 0) {
                                         myClass.setImg(R.drawable.f2);
                                     } else {
                                         myClass.setImg(R.drawable.f2);
                                         myClass.setName(str12);
                                     }
                                 } else if (str22.equals(aaa)) {
                                     if (str12.length() == 0) {
                                         myClass.setImg(R.drawable.f3);
                                     } else {
                                         myClass.setImg(R.drawable.f3);
                                         myClass.setName(str12);
                                     }
                                 } else if (str22.equals(aaaa)) {
                                     if (str12.length() == 0) {
                                         myClass.setImg(R.drawable.f4);
                                     } else {
                                         myClass.setImg(R.drawable.f4);
                                         myClass.setName(str12);
                                     }
                                 } else if (str22.length() == 0) {
                                     if (str12.length() == 0) {
                                         Toast.makeText(TsetActivity12.this, "请至少修改一项内容", Toast.LENGTH_SHORT).show();
                                     } else {
                                         myClass.setName(str12);
                                     }
                                 } else {
                                     Toast.makeText(TsetActivity12.this, "请从a,aa,aaa,aaaa中选择", Toast.LENGTH_SHORT).show();
                                 }

                                 gridAdapter.notifyDataSetChanged();
                             }
                         })
                         .show();
             }
         });

         gv_1.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
             @Override
             public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                 lm.remove(position);
                 gridAdapter.notifyDataSetChanged();
                 return true;
             }
         });

     }

     class GridAdapter extends BaseAdapter
     {
         @Override
         public int getCount() {
             return lm.size();
         }

         @Override
         public Object getItem(int position) {
             return lm.get(position);
         }

         @Override
         public long getItemId(int position) {
             return 0;
         }

         @Override
         public View getView(int position, View convertView, ViewGroup parent) {

             MyClass myClass=lm.get(position);

             if (convertView==null)
             {
                 Log.e("TAG", "适配器 getView=" + position);
                 convertView=View.inflate(TsetActivity12.this,R.layout.activity_main4,null);
             }
             ImageView imageView=(ImageView)convertView.findViewById(R.id.iv_1);

             imageView.setImageResource(myClass.getImg());

             TextView textView=(TextView)convertView.findViewById(R.id.tv_1);

             if (myClass.getName().length()>=5||myClass.getName().trim().length()==0)
             {
                 Toast.makeText(TsetActivity12.this, myClass.getName()+"不符合命名规则，请重新命名",
                         Toast.LENGTH_LONG).show();

                 textView.setText("");
             }
             else
             {
                 textView.setText(myClass.getName());
             }

             return convertView;
         }
     }

     class MyClass
     {
         private int img;

         private String name;

         public int getImg() {
             return img;
         }

         public void setImg(int img) {
             this.img = img;
         }

         public String getName() {
             return name;
         }

         public void setName(String name) {
             this.name = name;
         }

         public MyClass(int img,String name)
         {
             this.img=img;
             this.name=name;
         }
     }
 }