【Android】12.0 UI開發（三）——列表控制元件ListView的簡單實現2
摘要：
1.0 由於參考書上內容，已經和實際程式設計的相容性已經不太友好，很多內容已經可以棄用了，所以決定重寫專案，用於進一步學習列表控制元件ListView。
2.0 新建專案ListViewTest，其中檔案目錄如下：
image
3.0 Act...
1.0 由於參考書上內容，已經和實際程式設計的相容性已經不太友好，很多內容已經可以棄用了，所以決定重寫專案，用於進一步學習列表控制元件ListView。
2.0 新建專案ListViewTest，其中檔案目錄如下：
image
3.0 ActivityCollector.java
package com.example.listviewtest;
import android.app.Activity;
import java.util.ArrayList;
import java.util.List;
public class ActivityCollector {
public static List<Activity> activities = new ArrayList<>();
//新增活動
public static void addActivity(Activity activity){activities.add(activity);}
//移除活動
publicstatic void removeActivity(Activity activity){activities.remove(activity);}
//銷燬所有活動
public static void finishAll(){
for (Activity activity:activities){
if (!activity.isFinishing()){
activity.finish();
}
}
}
}
4.0 BaseActivity.java
package com.example.listviewtest;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
public class BaseActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d("BaseActivity:***",getClass().getSimpleName());
ActivityCollector.addActivity(this);
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}
5.0 Province.java
package com.example.listviewtest;
public class Province {
private String name;
public Province(String name){
this.name = name;
}
public String getName() {
return name;
}
}
6.0 ProvinceAdapter.java
package com.example.listviewtest;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.List;
public class ProvinceAdapter extends ArrayAdapter<Province> {
private int resourceId;
public ProvinceAdapter(Context context, int textViewResourceId, List<Province> objects) {
super(context, textViewResourceId, objects);
resourceId = textViewResourceId;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
Province province = getItem(position);//獲取當前的Province例項
View view = LayoutInflater.from(getContext()).inflate(resourceId, parent, false);
TextView provinceName =(TextView) view.findViewById(R.id.province_name);
provinceName.setText(province.getName());
return view;
}
}
7.0 activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <ListView android:id="@+id/list_view" android:layout_width="0dp" android:layout_height="wrap_content" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="@+id/guideline" /> <android.support.constraint.Guideline android:id="@+id/guideline" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" app:layout_constraintGuide_percent="0.05" /> </android.support.constraint.ConstraintLayout>
8.0 province_item.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:id="@+id/province_name" android:layout_width="match_parent" android:layout_height="32dp" android:textSize="18dp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintHorizontal_bias="0.0" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> </android.support.constraint.ConstraintLayout>
9.0 MainActivity.java
package com.example.listviewtest;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends BaseActivity {
private List<Province> provincelist = new ArrayList<>();
private String[] data = {
"廣西壯族自治區", "內蒙古自治區", "寧夏回族自治區", "西藏藏族自治區", "新疆維吾爾自治區", "香港特別行政區", "澳門特別行政區",
"北京市", "天津市", "上海市", "重慶市", "吉林省", "遼寧省", "黑龍江省",
"河北省", "河南省", "安徽省", "甘肅省", "山東省",
"湖南省", "湖北省", "江蘇省", "浙江省", "江西省",
"雲南省", "廣西省", "貴州省", "海南省", "臺灣省",};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initProvince();
ProvinceAdapter adapter = new ProvinceAdapter(MainActivity.this,
R.layout.province_item, provincelist);
ListView listView = (ListView) findViewById(R.id.list_view);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Province province = provincelist.get(position);
Toast.makeText(MainActivity.this, province.getName(), Toast.LENGTH_SHORT).show();
}
});
}
public void initProvince() {
for (String dataone : data) {
Province province = new Province(dataone);
provincelist.add(province);
}
//for (int i = 0;i<data.length;i++){
//Provinceprovince = new Province(data[i]);
//provincelist.add(province);
//}
}
}
10.0 執行效果如下：
image