【Android】12.0 UI开发（三）——列表控件ListView的简单实现2

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<>(); //添加活动
public static void addActivity(Activity activity){activities.add(activity);}
//移除活动
public static void removeActivity(Activity activity){activities.remove(activity);} //销毁所有活动 public static void finishAll(){
for (Activity activity:activities){
if (!activity.isFinishing()){
activity.finish();
}
}
}
}

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();
}
}

package com.example.listviewtest;public class Province {
private String name;
public Province(String name){
this.name = name;
} public String getName() {
return name;
}
}

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);//获取当前的Province实例
View view = LayoutInflater.from(getContext()).inflate(resourceId, parent, false);
TextView provinceName =(TextView) view.findViewById(R.id.province_name);
provinceName.setText(province.getName());
return view;
}
}

<?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>

<?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>

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 = {
"广西壮族自治区", "内蒙古自治区", "宁夏回族自治区", "西藏藏族自治区", "新疆维吾尔自治区", "香港特别行政区", "澳门特别行政区",
"北京市", "天津市", "上海市", "重庆市", "吉林省", "辽宁省", "黑龙江省",
"河北省", "河南省", "安徽省", "甘肃省", "山东省",
"湖南省", "湖北省", "江苏省", "浙江省", "江西省",
"云南省", "广西省", "贵州省", "海南省", "台湾省",}; @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++){
// Province province = new Province(data[i]);
// provincelist.add(province);
// }
}
}