android实践项目七自定义的Spinner

程序实现的效果

话不多说先上子布局


<LinearLayout xmlns:android&＃61;"http://schemas.android.com/apk/res/android" android:layout_width&＃61;"match_parent" android:layout_height&＃61;"match_parent" android:orientation&＃61;"horizontal" > <TextView android:id&＃61;"&＃64;&＃43;id/textView1" android:layout_width&＃61;"wrap_content" android:layout_height&＃61;"wrap_content" android:drawableLeft&＃61;"&＃64;drawable/ic_launcher" android:paddingRight&＃61;"8dip" android:paddingTop&＃61;"8dip" android:text&＃61;"TextView" android:textSize&＃61;"25sp" /> <TextView android:id&＃61;"&＃64;&＃43;id/textView2" android:layout_width&＃61;"wrap_content" android:layout_height&＃61;"wrap_content" android:paddingLeft&＃61;"8dip" android:paddingTop&＃61;"8dip" android:text&＃61;"TextView" android:textSize&＃61;"25sp" /> LinearLayout>

构造一个peeson类来封装数据

package com.example.demotest;public class Person { private String personName; private String personAddress; public Person(String personName, String personAddress) { super(); this.personName &＃61; personName; this.personAddress &＃61; personAddress; } public String getPersonName() { return personName; } public void setPersonName(String personName) { this.personName &＃61; personName; } public String getPersonAddress() { return personAddress; } public void setPersonAddress(String personAddress) { this.personAddress &＃61; personAddress; } }

再来写最重要的数据适配器&＃xff08;自定义组件的核心&＃xff09;

package com.example.demotest;import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView; public class MySpinnerAdapter extends BaseAdapter { private List mList; private Context mContext; public MySpinnerAdapter(Context pContext, List pList) { this.mContext &＃61; pContext; this.mList &＃61; pList; } &＃64;Override public int getCount() { return mList.size(); } &＃64;Override public Object getItem(int position) { return mList.get(position); } &＃64;Override public long getItemId(int position) { return position; } /** * 下面是重要代码 */ &＃64;Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater _LayoutInflater&＃61;LayoutInflater.from(mContext); convertView&＃61;_LayoutInflater.inflate(R.layout.spinner3, null); if(convertView!&＃61;null) { TextView _TextView1&＃61;(TextView)convertView.findViewById(R.id.textView1); TextView _TextView2&＃61;(TextView)convertView.findViewById(R.id.textView2); _TextView1.setText(mList.get(position).getPersonName()); _TextView2.setText(mList.get(position).getPersonAddress()); } return convertView; }
}

看重写的getview方法用布局构建器加载子布局在实例化自布局里面的Textview 表示还可以用viewholder优化

最后再看主要的活动

package com.example.demotest;import java.util.ArrayList;
import java.util.List;import android.app.Activity;
import android.os.Bundle;
import android.widget.Spinner;public class SpinnerTest extends Activity {&＃64;Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.spinner4);Spinner mSpinner &＃61; (Spinner) findViewById(R.id.spinnertest);// 建立数据源List persons &＃61; new ArrayList();persons.add(new Person("张三", "上海 "));persons.add(new Person("李四", "上海 "));persons.add(new Person("王五", "北京"));persons.add(new Person("赵六", "广州 "));// 建立Adapter绑定数据源MySpinnerAdapter _MyAdapter &＃61; new MySpinnerAdapter(this, persons);// 绑定AdaptermSpinner.setAdapter(_MyAdapter);}
}


代码很简单 初始化控件 和数据 再给Spinner加载适配器就好了

主布局文件就只是一个Spinner


<LinearLayout xmlns:android&＃61;"http://schemas.android.com/apk/res/android" android:layout_width&＃61;"match_parent" android:layout_height&＃61;"match_parent" android:orientation&＃61;"horizontal" > <Spinner android:id&＃61;"&＃64;&＃43;id/spinnertest"android:layout_width&＃61;"match_parent"android:layout_height&＃61;"wrap_content"android:spinnerMode&＃61;"dialog"/>LinearLayout>

Spinner的弹出属性在android:spinnerMode中设置
很简单的案例 看完跑一遍吧~