AlertDialog

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package com.example.alertdialog;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 MainActivity 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.activity_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(MainActivity.this);                                else if(v==btnShowDialog_Layout)                  showDialog_Layout(MainActivity.this);                        }        }        //显示基本的AlertDialog       private void showDialog(Context context) {          AlertDialog.Builder builder = new AlertDialog.Builder(context);          builder.setIcon(R.drawable.ic_launcher);          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.ic_launcher);          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();      }  }

<?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="fill_parent"    android:orientation="vertical" >    <Button        android:id="@+id/Button01"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="非Layout型对话框" >    </Button>    <Button        android:id="@+id/Button02"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="Layout型对话框" >    </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:id="@+id/edtInput"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_marginLeft="20dip"        android:layout_marginRight="20dip"        android:textAppearance="?android:attr/textAppearanceMedium" /></LinearLayout>

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