Android学习之对话框(单选按钮)
MyDialogDemo.java:
import android.app.Activity; import android.app.AlertDialog; import android.app.Dialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class MyDialogDemo extends Activity { private Button mybut = null ; // 定义按钮 private TextView mych = null ; // 定义文本 private TextView mytext = null ; // 定义文本 private String fruitData [] = new String[] { "苹果", "西瓜", "水蜜桃" }; private String fruitDesc [] = new String[] { "苹果,植物类水果,多次花果,具有丰富的营养成分,有食疗、辅助治疗等功能。", "西瓜(学名:Citrullus Lanatus,英文:Watermelon),属葫芦科,原产于非洲。", "水蜜桃,在植物分类学上属于蔷薇科,梅属,桃亚属,为落叶小乔木。"} ; private int chNum = 0 ; // 保存选项 @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); super.setContentView(R.layout.main); // 调用布局管理器 this.mybut = (Button) super.findViewById(R.id.mybut) ; // 取得按钮 this.mych = (TextView) super.findViewById(R.id.mych) ; // 取得文本 this.mytext = (TextView) super.findViewById(R.id.mytext) ; // 取得文本 this.mybut.setOnClickListener(new OnClickListenerImpl()) ; // 设置事件类 } private class OnClickListenerImpl implements OnClickListener { @Override public void onClick(View view) { Dialog dialog = new AlertDialog.Builder(MyDialogDemo.this) .setIcon(R.drawable.pic_m) .setTitle("请选择你喜欢吃的水果?") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { MyDialogDemo.this.mych .setText(MyDialogDemo.this.fruitData[MyDialogDemo.this.chNum]); // 设置选项的名称 } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { } }).setSingleChoiceItems(MyDialogDemo.this.fruitData, 0, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { MyDialogDemo.this.mytext .setText(MyDialogDemo.this.fruitDesc[which]); MyDialogDemo.this.chNum = which ; // 保存选项的索引 } }).create() ; dialog.show() ; } }
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:id="@+id/mych" android:text="" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/mytext" android:text="" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <Button android:id="@+id/mybut" android:text="选择水果" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout>
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