例3-5
消息对话框应用实例
在本例中设计了两种形式的对话框程序,一种是发出提示消息的普通对话框,另一种是用户登录对话框
源码
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="打开普通对话框"
android:textSize="20sp"
android:id="@+id/button1"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:text="打开输入对话框"
android:textSize="20sp"/>
</LinearLayout>
login.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/user"
android:textSize="18sp"
android:text="用户名"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/userEdit"
android:textSize="18sp"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/password"
android:text="密码"
android:textSize="18sp"/>
<EditText
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/paswdEdit"
android:textSize="18sp"/>
</LinearLayout>
MainActivity.java
package com.example.myapplication3_5;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.app.AlertDialog.Builder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.Button;
import android.content.DialogInterface;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
ProgressDialog mydialog;
Button btn1,btn2;
LinearLayout login;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1=(Button)findViewById(R.id.button1);
btn2=(Button)findViewById(R.id.button2);
btn1.setOnClickListener(new mClick());
btn2.setOnClickListener(new mClick());
}
class mClick implements View.OnClickListener{
Builder dialog=new AlertDialog.Builder(MainActivity.this);
public void onClick(View arg0){
if(arg0==btn1){
dialog.setTitle("警告");//设置对话框的标题
dialog.setIcon(R.drawable.icon1);//设置对话框图标
dialog.setMessage("本项操作可能导致信息泄露!");//设置对话框显示的内容
dialog.setPositiveButton("确定",new okClick());//设置对象框
dialog.create();//创建对象框
dialog.show();
}
else if(arg0==btn2){
login=(LinearLayout)getLayoutInflater().inflate(R.layout.login,null);
dialog.setTitle("用户登录").setMessage("请输入用户名和密码").setView(login);
dialog.setPositiveButton("确定",new loginClick());
dialog.setNegativeButton("退出",new exitClick());
dialog.setIcon(R.drawable.icon2);
dialog.create();
dialog.show();
}
}
}
class okClick implements DialogInterface.OnClickListener{
public void onClick(DialogInterface dialog,int which){
dialog.cancel();//关闭对话框
}
}
//输入对话框的确定事件
class loginClick implements DialogInterface.OnClickListener{
EditText txt;
public void onClick(DialogInterface dialog,int which){
txt=(EditText)login.findViewById(R.id.paswdEdit);//取出输入编辑框的值和密码与admin比较
if((txt.getText().toString()).equals("admin"))
Toast.makeText(getApplicationContext(),"登陆成功",Toast.LENGTH_SHORT).show();
dialog.dismiss();//关闭
}
}
class exitClick implements DialogInterface.OnClickListener{
public void onClick(DialogInterface dialog,int which){
MainActivity.this.finish();//点击退出MainActivity
}
}
}
结果图
例3-6
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<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"
tools:context=".MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="进度条对话框"
android:id="@+id/button1"
android:textSize="24sp"
android:layout_gravity="center"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="日期选择对话框"
android:id="@+id/button2"
android:textSize="24sp"
android:layout_gravity="center"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="时间选择对话框"
android:id="@+id/button3"
android:textSize="24sp"
android:layout_gravity="center"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text=""
android:textSize="24sp"
android:id="@+id/txt"
/>
</LinearLayout>
MainActivity.java
package com.example.myapplication3_6;
import android.app.DatePickerDialog;
import android.app.ProgressDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.app.TimePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
public class MainActivity extends AppCompatActivity {
Button btn1,btn2,btn3;
TextView txt;
String y,m,d,h,min;
String time="";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1=(Button)findViewById(R.id.button1);
btn2=(Button)findViewById(R.id.button2);
btn3=(Button)findViewById(R.id.button3);
txt=(TextView) findViewById(R.id.txt);
btn1.setOnClickListener(new mClick());
btn2.setOnClickListener(new mClick());
btn3.setOnClickListener(new mClick());
}
class mClick implements OnClickListener{
int m_year=2012;
int m_month=1;
int m_day=1;
int m_hour=12,m_minute=1;
public void onClick(View v){
if(v==btn1){
ProgressDialog d=new ProgressDialog(MainActivity.this);
d.setTitle("进度对话框");
d.setIndeterminate(true);
d.setMessage("程序正在Loading...");
d.setCancelable(true);
d.setMax(10);
d.show();
}
else if(v==btn2) {
//设置日期监听器
OnDateSetListener dateListener = new OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
m_year = year;
m_month = monthOfYear;
m_day = dayOfMonth;
y = String.valueOf(m_year);
m = String.valueOf(m_month);
d = String.valueOf(m_day);
time = y + "年" + m + "月" + d + "日";
txt.setText(time);//获取日期信息
}
};
//创造日期对话框对象
DatePickerDialog date = new DatePickerDialog(MainActivity.this, dateListener, m_year, m_month, m_day);
date.setTitle("日期对话框");
date.show();
}
else if(v==btn3)
{
//设置事件监听器
OnTimeSetListener timeListener=new OnTimeSetListener() {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
m_hour=hourOfDay;
m_minute=minute;
h=String.valueOf(m_hour);
min=String.valueOf(m_minute);
time=time+h+"时"+min+"分";
txt.setText(time);//获取时间信息
}
};
TimePickerDialog d=new TimePickerDialog(MainActivity.this,timeListener,m_hour,m_minute,true);
d.setTitle("时间对话框");
d.show();
}
}
}
}
结果图