demo15 AlertDialog

Dialog dialog = new AlertDialog.Builder(this).setTitle("对话框").setMessage("this is msg info").setIcon(R.drawable.ic_launcher).create();
dialog.show();

package com.example.demo15alertdialog;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

this.button=(Button)super.findViewById(R.id._btn);

this.button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Dialog dialog = new AlertDialog.Builder(MainActivity.this).setTitle("对话框")
.setMessage("this is msg info")
.setIcon(R.drawable.ic_launcher)
.setPositiveButton("Delete",new DialogInterface.OnClickListener(){public void onClick(DialogInterface dialogInterface,int whichButton) {
}})
.setNeutralButton("Show Detail",new DialogInterface.OnClickListener(){public void onClick(DialogInterface dialogInterface,int whichButton) {
}})
.setNegativeButton("Cancel",new DialogInterface.OnClickListener(){public void onClick(DialogInterface dialogInterface,int whichButton) {
}})
.create();
dialog.show();
}
});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}