个人网站建设教程视频,wordpress前台不显示图片,西安电子商务网站开发,民政网站建设情况汇报1. AlertDialog
AlertDialog是弹出的提醒对话框#xff0c;有提示#xff0c;确认#xff0c;选择等功能。
没有公开的构造方法#xff0c;一般用AlertDialog.Builder来完成参数设置#xff0c;最后调用create方法创建。
参数设置常用的方法#xff1a; 代码#xff…1. AlertDialog
AlertDialog是弹出的提醒对话框有提示确认选择等功能。
没有公开的构造方法一般用AlertDialog.Builder来完成参数设置最后调用create方法创建。
参数设置常用的方法 代码
package com.example.ch3;import androidx.appcompat.app.AppCompatActivity;import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;public class AlertDialogActivity extends AppCompatActivity implements View.OnClickListener {private TextView tv;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_alert_dialog);findViewById(R.id.bt).setOnClickListener(this);tv findViewById(R.id.tv);}Overridepublic void onClick(View view) {AlertDialog.Builder builder new AlertDialog.Builder(this);builder.setTitle(Dear customer);builder.setMessage(Do you want to download this file?);builder.setNegativeButton(No, thanks, new DialogInterface.OnClickListener() {Overridepublic void onClick(DialogInterface dialogInterface, int i) {tv.setText(Cancel download file);}});builder.setPositiveButton(Yes, new DialogInterface.OnClickListener() {Overridepublic void onClick(DialogInterface dialogInterface, int i) {tv.setText(Downloading file...);}});AlertDialog dialog builder.create();dialog.show();}
}
效果图 2. DatePickerDialog
DatePickerDialog在 AlertDialog上添加了日期选择器DatePicker达到日期选择弹窗的目的。
先来看一下日期选择器DatePicker的使用
?xml version1.0 encodingutf-8?
LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/androidxmlns:apphttp://schemas.android.com/apk/res-autoxmlns:toolshttp://schemas.android.com/toolsandroid:layout_widthmatch_parentandroid:layout_heightmatch_parenttools:context.DatePickerDialogActivityandroid:orientationverticalandroid:gravitycenter_horizontalDatePickerandroid:idid/dpandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:datePickerModespinnerandroid:calendarViewShownfalse/DatePickerButtonandroid:idid/btandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:textConfirm/ButtonTextViewandroid:idid/tvandroid:layout_widthmatch_parentandroid:layout_heightwrap_content/TextView
/LinearLayout
datePickerMode可以选spinner或者calendar
spinner同时显示日期选择滑动窗口和日历可以用calendarViewShown关掉日历
calendar只显示日历java代码
package com.example.ch3;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;public class DatePickerDialogActivity extends AppCompatActivity implements View.OnClickListener {private DatePicker dp;private TextView tv;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_date_picker_dialog);findViewById(R.id.bt).setOnClickListener(this);dp findViewById(R.id.dp);tv findViewById(R.id.tv);}Overridepublic void onClick(View view) {String s String.format(You choose %d/%d/%d, dp.getYear(),dp.getMonth()1, dp.getDayOfMonth());tv.setText(s);}
} 效果图 DatePickerDialog则是内置了日期选择器的弹窗用onDateSet方法设置确定日期之后的动作。
代码
package com.example.ch3;import androidx.appcompat.app.AppCompatActivity;import android.app.DatePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;public class DatePickerDialogActivity extends AppCompatActivity implements View.OnClickListener, DatePickerDialog.OnDateSetListener {private DatePicker dp;private TextView tv;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_date_picker_dialog);findViewById(R.id.bt).setOnClickListener(this);findViewById(R.id.bt_date).setOnClickListener(this);dp findViewById(R.id.dp);tv findViewById(R.id.tv);}Overridepublic void onClick(View view) {switch(view.getId()){case R.id.bt:String s String.format(You choose %d/%d/%d, dp.getYear(),dp.getMonth()1, dp.getDayOfMonth());tv.setText(s);break;case R.id.bt_date:DatePickerDialog datePickerDialog new DatePickerDialog(this,this,2000,1,1);datePickerDialog.show();break;}}Overridepublic void onDateSet(DatePicker dp, int i, int i1, int i2) {String s String.format(You choose %d/%d/%d, dp.getYear(),dp.getMonth()1, dp.getDayOfMonth());tv.setText(s);}
} 效果图 3.TimePickerDialog
TimePickerDialog和DatePickerDialog原理类似内置了时间选择器TimePicker。
xml代码
?xml version1.0 encodingutf-8?
LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/androidxmlns:apphttp://schemas.android.com/apk/res-autoxmlns:toolshttp://schemas.android.com/toolsandroid:layout_widthmatch_parentandroid:layout_heightmatch_parenttools:context.DatePickerDialogActivityandroid:orientationverticalandroid:gravitycenter_horizontalTimePickerandroid:idid/tpandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:timePickerModespinner/TimePickerButtonandroid:idid/btandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:textConfirm/ButtonTextViewandroid:idid/tvandroid:layout_widthmatch_parentandroid:layout_heightwrap_content/TextViewButtonandroid:idid/bt_timeandroid:layout_marginTop50dpandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:textChoose Time/Button
/LinearLayout java代码
package com.example.ch3;import androidx.appcompat.app.AppCompatActivity;import android.app.TimePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.TimePicker;import java.util.Calendar;public class TimePickerActivity extends AppCompatActivity implements View.OnClickListener, TimePickerDialog.OnTimeSetListener {private TextView tv;private TimePicker tp;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_time_picker);findViewById(R.id.bt).setOnClickListener(this);findViewById(R.id.bt_time).setOnClickListener(this);tv findViewById(R.id.tv);tp findViewById(R.id.tp);}Overridepublic void onClick(View view) {switch (view.getId()){case R.id.bt:String s String.format(You choose %d/%d,tp.getHour(), tp.getMinute());tv.setText(s);break;case R.id.bt_time:Calendar calendar Calendar.getInstance();TimePickerDialog timePickerDialog new TimePickerDialog(this, this,calendar.get(Calendar.HOUR_OF_DAY),calendar.get(Calendar.MINUTE),true);timePickerDialog.show();}}Overridepublic void onTimeSet(TimePicker timePicker, int i, int i1) {String s String.format(You choose %d/%d,i, i1);tv.setText(s);}
}
效果图
