Android应用开发UI(下拉列表)
在Android平台上使用下拉列表用到了Spinner组件,效果图如下:
代码:
1,res/values/string.xml
<?xml version="1.0" encoding="utf-8"?> <resources> <string name="title_tx">团购人群调查:你所处在年龄段:</string> <string name="app_name">下拉列表(Spinner)</string> <string name="about_80080088">更多详情,可登录http://www.80080088.com了解。</string> </resources>
2,res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/title_tx" android:id="@+id/title_tx"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/about_80080088" android:id="@+id/about_80080088"> </TextView> <Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/spinnerAge"> </Spinner> </LinearLayout>
3.Activity类
package com.cottsoft.android;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
public class A008Activity extends Activity {
private static final String[] m_Ages = {"0到18岁","19至30岁","31到60岁","61岁到80岁","81岁以上"};
private TextView m_title_tx,m_about_80080088;
private Spinner m_Spinner;
private ArrayAdapter<String> adapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
m_title_tx = (TextView) findViewById(R.id.title_tx);
m_about_80080088=(TextView) findViewById(R.id.about_80080088);
m_Spinner = (Spinner) findViewById(R.id.spinnerAge);
m_title_tx.setTextSize(22);
m_about_80080088.setTextSize(15);
m_about_80080088.setTextColor(Color.GRAY);
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item,m_Ages);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
m_Spinner.setAdapter(adapter);
m_Spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
m_title_tx.setText(getResources().getString(R.string.title_tx)+m_Ages[arg2]);
arg0.setVisibility(View.VISIBLE);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
}
}