Android--创建对话框AlertDialog

　　学习Android过程中发现showDialog()、onCreateDialog()这些方法从Android4.0开始都过时了。

　　官方推荐使用DialogFragment类来创建对话框。

　　1）布局文件dialog_activity.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

        <Button

                android:id="@+id/btn_dialog"

                android:layout_width="wrap_content"

                android:layout_height="wrap_content"

                android:text="@string/btn_dialog_text"

                android:layout_gravity="center_horizontal"/>

</LinearLayout>

　　2）Activity代码

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();

        }

    }

}

　　3）运行效果