android 如何创建对话框AlertDialog

[android]代码库
package cn.luxh.dialognew;
 
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
 
public class DialogActivity extends Activity{
     
    private static final String TAG = "DialogActivity";
     
     
    private Button btn_Dialog;
     
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.dialog_activity);
        handleButtonClick();
    }
     
     
    /**
     * 处理按钮事件
     */
    private void handleButtonClick() {
        btn_Dialog = (Button) findViewById(R.id.btn_dialog);
        btn_Dialog.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                    AlertDialogFragment alertDialogFragment = AlertDialogFragment.newInstance();
                    //显示对话框
                    alertDialogFragment.show(getFragmentManager(), "MyDialog");
                }
        });
    }
     
    /**
     * 确定按钮事件处理
     */
    private  void doPositiveClick() {
        Log.d(TAG, "确定按钮事件处理");
        Toast.makeText(this, "确定按钮被点击！", Toast.LENGTH_SHORT).show();
    }
     
    /**
     * 取消按钮事件处理
     */
    private  void doNegativeClick(){
        Log.d(TAG, "取消按钮事件处理");
        Toast.makeText(this, "取消按钮被点击！", Toast.LENGTH_SHORT).show();
    }
     
    /**
     * 生成对话框
     */
    public static class AlertDialogFragment extends DialogFragment{
         
        private static AlertDialogFragment alertDialogFragment = new AlertDialogFragment();
         
        public static AlertDialogFragment newInstance() {
            return alertDialogFragment;
        }
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {
            return new AlertDialog.Builder(getActivity())
                                                .setIcon(R.drawable.ic_launcher)
                                                .setTitle("我的对话窗口")
                                                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                                                    @Override
                                                    public void onClick(DialogInterface dialog, int which) {
                                                        ((DialogActivity)getActivity()).doPositiveClick();
                                                    }
                                                })
                                                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                                                    @Override
                                                    public void onClick(DialogInterface dialog, int which) {
                                                        ((DialogActivity)getActivity()).doNegativeClick();
                                                    }
                                                }).create();
        }
    }
}
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