Android课堂笔记——dialog对话框

最新推荐文章于 2025-07-15 10:11:57 发布

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#android #android开发 #对话框

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本文介绍了Android开发中常用的几种对话框创建方法，包括AlertDialog、DatePickerDialog、TimePickerDialog和ProgressDialog等，并提供了具体的代码实现示例。

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几种常见的dialog对话框

Dialog是android开发过程中最常用到的组件之一，Dialog的创立办法有两种：
一是直接new一个Dialog目标，然后调用Dialog目标的show和dismiss办法来操控对话框的显现和躲藏。
二是在Activity的onCreateDialog(int id)办法中创立Dialog目标并回来，然后调用Activty的showDialog(int id)和dismissDialog(int id)来显现和躲藏对话框。
差异在于经过第二种办法创立的对话框会承继Activity的特点，比方取得Activity的menu事情等。

下面案例主要是使用第一种方式来制作的几种不同的对话框：
MainActicity:

package com.briup.dialog;

import java.util.Calendar;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.ProgressDialog;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.TimePicker;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void btn1(View view) {
        showAlertDialog();
    }

    /*
     * 显示AlertDialog
     */
    private void showAlertDialog() {

        AlertDialog.Builder builder = new AlertDialog.Builder(this);

        // 不能通过点击对话框以外的区域把它关闭掉
        builder.setCancelable(false);
        // 设置标题
        builder.setTitle("提示");
        // 设置图标
        builder.setIcon(R.drawable.ic_launcher);
        // 设置最简单的文本提示信息
        builder.setMessage("确认退出吗");
        builder.setPositiveButton("确认", new OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                // TODO Auto-generated method stub
                finish();
            }
        });

        builder.setNegativeButton("取消", null);
        builder.create().show();
    }

    public void btn2(View view) {
        showDatePickerDialog();
    }

    private void showDatePickerDialog() {

        // 获取手机的当前日期
        Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int day = calendar.get(Calendar.DAY_OF_MONTH);

        DatePickerDialog datePickerDialog = new DatePickerDialog(this, new OnDateSetListener() {

            @Override
            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                // TODO Auto-generated method stub
                Toast.makeText(MainActivity.this, "您选择了" + year + "年" + (monthOfYear + 1) + "月" + dayOfMonth + "日",
                        Toast.LENGTH_SHORT).show();

            }
        }, year, month, day);
        datePickerDialog.show();
    }

    public void btn3(View view) {
        showTimePickerDialog();
    }

    private void showTimePickerDialog() {
        Calendar calendar = Calendar.getInstance();
        int hour = calendar.get(Calendar.HOUR);
        int minute = calendar.get(Calendar.MINUTE);

        TimePickerDialog timePickerDialog = new TimePickerDialog(this, new OnTimeSetListener() {

            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                // TODO Auto-generated method stub

            }
        }, hour, minute, false);
        timePickerDialog.show();
    }

    public void btn4(View view) {
        showProgressDialog();
    }

    private void showProgressDialog() {
        ProgressDialog progressDialog = new ProgressDialog(this);
        progressDialog.setMessage("正在下载");
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progressDialog.setMax(100);
        progressDialog.setProgress(50);
        progressDialog.setIndeterminate(false);
        progressDialog.show();
    }

    public void btn5(View view) {
        showMyDialog();
    }

    /**
     * 显示自定义对话框
     */
    private void showMyDialog() {

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        View view = View.inflate(this, R.layout.myview, null);
        builder.setView(view);
        final AlertDialog alertDialog = builder.create();
        alertDialog.show();

        final EditText userName_Et = (EditText) view.findViewById(R.id.username_Et);
        final EditText pwd_Et = (EditText) view.findViewById(R.id.pwd_Et);
        Button submit_Btn = (Button) view.findViewById(R.id.submit_Btn);
        Button cancel_Btn = (Button) view.findViewById(R.id.cancel_Btn);

        submit_Btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                String userName = userName_Et.getText().toString();
                String password = pwd_Et.getText().toString();

                Toast.makeText(MainActivity.this, "用户名:" + userName + "\n" + "密码:" + password, Toast.LENGTH_SHORT)
                        .show();
                alertDialog.cancel();
            }

        });

    }

}

activity_main:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="btn1"
        android:text="显示AlertDialog" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="btn2"
        android:text="显示DatePickerDialog" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="btn3"
        android:text="显示TimePickerDialog" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="btn4"
        android:text="显示ProgressDialog" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="btn5"
        android:text="显示自定义对话框" />

</LinearLayout>

自定义对话框用到的布局文件：

    <?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" >

    <EditText android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/username_Et"
        android:hint="请输入用户名"/>
  <EditText android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/pwd_Et"
        android:hint="请输入密码"/>

  <Button android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/submit_Btn"
      android:text="确定"/>
   <Button android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/cancel_Btn"
      android:text="取消"/>
</LinearLayout>

效果如图所示：
这里写图片描述