Android弹出对话框简单代码

package com.zxing.dialog;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.Context;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class DialogTest extends Activity {private static final int DIALOG=1;    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        Button btn=(Button)findViewById(R.id.button1);        btn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubshowDialog(DIALOG);//Activity里面的函数,然后调用onCreateDialog这个方法,最后调用onPrepareDialog这个方法}});    }@Overrideprotected Dialog onCreateDialog(int id) {// TODO Auto-generated method stubif(id==1){return this.buildDialog(DialogTest.this);}else{return null;}}@Overrideprotected void onPrepareDialog(int id, Dialog dialog) {// TODO Auto-generated method stubsuper.onPrepareDialog(DIALOG, dialog);}        private Dialog buildDialog(Context context){    AlertDialog.Builder builder=new AlertDialog.Builder(context);    builder.setIcon(R.drawable.alert_dialog_icon);    builder.setTitle(R.string.alertitle);    builder.setPositiveButton(R.string.right,new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubsetTitle("您单击了对话框上面的正确按钮");}});        return builder.create();    }    }
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