Android入门之AlertDialog用法实例分析

<?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"  ><Button android:id="@+id/Button01" android:layout_height="wrap_content" android:text="非Layout型对话框" android:layout_width="fill_parent"></Button><Button android:id="@+id/Button02" android:layout_height="wrap_content" android:text="Layout型对话框" android:layout_width="fill_parent"></Button><View android:id="@+id/View01" android:layout_width="wrap_content" android:layout_height="wrap_content"></View></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="vertical"> <EditText android:layout_height="wrap_content" android:layout_width="fill_parent" android:layout_marginLeft="20dip" android:layout_marginRight="20dip" android:textAppearance="?android:attr/textAppearanceMedium" android:id="@+id/edtInput"/></LinearLayout>

package com.testAlertDialog;import android.app.Activity;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.os.Bundle;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.PopupWindow;public class testAlertDialog extends Activity { Button btnShowDialog; Button btnShowDialog_Layout;  /** Called when the activity is first created. */  @Override  public void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.main);    //定义按钮    btnShowDialog=(Button)this.findViewById(R.id.Button01);    btnShowDialog.setOnClickListener(new ClickEvent());    btnShowDialog_Layout=(Button)this.findViewById(R.id.Button02);    btnShowDialog_Layout.setOnClickListener(new ClickEvent());  }      //统一处理按键事件  class ClickEvent implements OnClickListener{   @Override   public void onClick(View v) {   // TODO Auto-generated method stub   if(v==btnShowDialog)    showDialog(testAlertDialog.this);       else if(v==btnShowDialog_Layout)    showDialog_Layout(testAlertDialog.this);      }  }  //显示基本的AlertDialog private void showDialog(Context context) { AlertDialog.Builder builder = new AlertDialog.Builder(context); builder.setIcon(R.drawable.icon); builder.setTitle("Title"); builder.setMessage("Message"); builder.setPositiveButton("Button1",  new DialogInterface.OnClickListener() {   public void onClick(DialogInterface dialog, int whichButton) {   setTitle("点击了对话框上的Button1");   }  }); builder.setNeutralButton("Button2",  new DialogInterface.OnClickListener() {   public void onClick(DialogInterface dialog, int whichButton) {   setTitle("点击了对话框上的Button2");   }  }); builder.setNegativeButton("Button3",  new DialogInterface.OnClickListener() {   public void onClick(DialogInterface dialog, int whichButton) {   setTitle("点击了对话框上的Button3");   }  }); builder.show(); }  //显示基于Layout的AlertDialog private void showDialog_Layout(Context context) { LayoutInflater inflater = LayoutInflater.from(this); final View textEntryView = inflater.inflate(  R.layout.dialoglayout, null); final EditText edtInput=(EditText)textEntryView.findViewById(R.id.edtInput); final AlertDialog.Builder builder = new AlertDialog.Builder(context); builder.setCancelable(false); builder.setIcon(R.drawable.icon); builder.setTitle("Title"); builder.setView(textEntryView); builder.setPositiveButton("确认",  new DialogInterface.OnClickListener() {   public void onClick(DialogInterface dialog, int whichButton) {   setTitle(edtInput.getText());   }  }); builder.setNegativeButton("取消",  new DialogInterface.OnClickListener() {   public void onClick(DialogInterface dialog, int whichButton) {   setTitle("");   }  }); builder.show(); }}