Android：如何从日期和时间选择器获取值

问题描述 投票：0回答：5
我正在构建一个应用程序，在其中我试图要求用户选择时间，所以我使用了

datePicker

 和
timePicker
 和
button set
。因此，当他点击
set button
 时，会出现
dialog box
 并表示您已经选择了 x 日期和 x 时间，或者以任何方式，屏幕上应该出现一条消息，就像用户这次选择了一样。所以我构建了代码，但当我的应用程序进入该活动时，它总是被强制停止。与显示数据相关的
xml file
 没有问题，因为当我注释从
datePicker
 和
timePicker 获取值的 java 行时
，应用程序运行得非常好。
我仍然发布这两个文件代码以便于理解。还发布日志猫异常。我删除了所有不必要的代码，例如导入和包以及额外的按钮等，以使其快速可读。

这是.xml

文件的代码

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:weightSum="10" android:id="@+id/commonlayout" android:background="#FFFFFF"> <LinearLayout android:id="@+id/llheader" android:layout_width="fill_parent" android:layout_height="20dp" android:layout_weight="1" android:background="@drawable/bg"> <RelativeLayout android:id="@+id/relativeLayout1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_gravity="center"> <!--header--> <TextView android:id="@+id/txt_header" android:layout_width="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true"/> </RelativeLayout> </LinearLayout> <ScrollView android:id="@+id/scrollView1" android:layout_width="wrap_content" android:layout_height="wrap_content" xmlns:android="http://schemas.android.com/apk/res/android"> <LinearLayout android:layout_width="wrap_content" android:id="@+id/linearLayout1" android:orientation="vertical" android:layout_height="wrap_content" <DatePicker android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/datePicker"></DatePicker> <TimePicker android:id="@+id/timePicker" android:layout_width="wrap_content" android:layout_height="wrap_content</TimePicker> <TableRow android:id="@+id/tableRow1" android:layout_height="wrap_content" android:layout_width="match_parent" android:gravity="center"> <Button android:id="@+id/btnSetDateTime" android:layout_height="wrap_content" android:text="Set" android:layout_width="wrap_content"/> <Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Next" android:id="@+id/btnNext1" /> </TableRow> </LinearLayout> </ScrollView> <LinearLayout android:id="@+id/lldata" android:layout_weight="8" android:layout_width="fill_parent" android:layout_height="0dp" android:background="#FFFFFF"> </LinearLayout> <LinearLayout android:id="@+id/llfooter" android:layout_width="fill_parent" android:orientation="horizontal" android:layout_height="20dp" android:visibility="visible" android:layout_margin="0dp"> </LinearLayout>

这是TimeDate.java

的代码：

public class TimeDate extends Activity { Button btnNext; private TextView dateText; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.time_date); btnNext=(Button)this.findViewById(R.id.btnNext1); btnNext.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent myintent = new Intent(TimeDate.this, Next.class); startActivity(myintent); finish(); } }); ScrollView DTPicker = (ScrollView) View.inflate(TimeDate.this,R.layout.time_date, null); Button btnSet = (Button) DTPicker.findViewById(R.id.btnSetDateTime); final DatePicker dp = (DatePicker) DTPicker.findViewById(R.id.datePicker); final TimePicker tp = (TimePicker) DTPicker.findViewById(R.id.timePicker); btnSet.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String strDateTime = dp.getYear() + "-" + (dp.getMonth() + 1) + "-" + dp.getDayOfMonth() + " "+ tp.getCurrentHour() + ":" + tp.getCurrentMinute();}}); AlertDialog alert = new AlertDialog.Builder(TimeDate.this).create(); alert.setTitle("Reminder"); alert.setView(DTPicker); alert.show(); } }

这是logcat

例外：

04-27 11:48:24.830: D/AndroidRuntime(812): Shutting down VM 04-27 11:48:24.830: W/dalvikvm(812): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 04-27 11:48:24.851: E/AndroidRuntime(812): FATAL EXCEPTION: main 04-27 11:48:24.851: E/AndroidRuntime(812): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ogtpl.android/com.ogtpl.android.TimeDate}: java.lang.ClassCastException: android.widget.LinearLayout
java android date time datepicker
5个回答
13
投票
不要做任何额外的事情，你的代码就是完美的。无论您在何处使用，只需删除

ScrollLayout

 或其属性的代码即可。 
让我为您编写更新后的代码
ScrollLayout



 final   DatePicker dp = (DatePicker) findViewById(R.id.datePicker);
        final   TimePicker tp = (TimePicker) findViewById(R.id.timePicker);
        btnSet.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                String strDateTime = dp.getYear() + "-" + (dp.getMonth() + 1) + "-" + dp.getDayOfMonth() + " "+ tp.getCurrentHour() + ":" + tp.getCurrentMinute();

                Toast.makeText(TimeDate.this, "User selected " + strDateTime + "Time", Toast.LENGTH_LONG).show(); //Generate a toast only if you want 
                finish();   // If you want to continue on that TimeDateActivity
                 // If you want to go to new activity that code you can also write here
            }});

    



    

    
    
    

    

        

            

                

                    
1
投票

                    
                

            

        

        
ScrollView DTPicker = (ScrollView) View.inflate(TimeDate.this,R.layout.time_date, null);
Button  btnSet = (Button) DTPicker.findViewById(R.id.btnSetDateTime);
final   DatePicker dp = (DatePicker) DTPicker.findViewById(R.id.datePicker);
final   TimePicker tp = (TimePicker) DTPicker.findViewById(R.id.timePicker);



将上面的行替换为下面的行 



ScrollView DTPicker = (ScrollView)findViewById(R.id.scrollView1);
Button  btnSet = (Button)findViewById(R.id.btnSetDateTime);
final   DatePicker dp = (DatePicker)findViewById(R.id.datePicker);
final   TimePicker tp = (TimePicker)findViewById(R.id.timePicker);

    



    

    
    
    

    

        

            

                

                    
0
投票

                    
                

            

        

        
您的问题似乎在这一行：



ScrollView DTPicker = (ScrollView) View.inflate(TimeDate.this,R.layout.time_date, null);



您正在膨胀包含 
LinearLayout
 作为根节点的 XML，但是您将其类型转换为 
ScrollView
，从而导致 
ClassCastException
。

    



    

    
    
    

    

        

            

                

                    
0
投票

                    
                

            

        

        
尝试以下代码......



时间_日期.xml


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical"
    android:layout_width="fill_parent" android:layout_height="fill_parent" android:weightSum="10" android:id="@+id/commonlayout"
    android:background="#FFFFFF">

    <LinearLayout android:id="@+id/llheader" android:layout_width="fill_parent" android:layout_height="20dp"
        android:layout_weight="1">
        <RelativeLayout android:id="@+id/relativeLayout1" android:layout_width="fill_parent"
            android:layout_height="fill_parent" android:layout_gravity="center"> <!--header -->
            <TextView android:id="@+id/txt_header" android:layout_width="wrap_content" android:layout_centerHorizontal="true"
                android:layout_centerVertical="true" android:layout_height="wrap_content" />
        </RelativeLayout>
    </LinearLayout>

    <ScrollView android:id="@+id/scrollView1" android:layout_width="wrap_content" android:layout_height="wrap_content"
        xmlns:android="http://schemas.android.com/apk/res/android">
        <LinearLayout android:layout_width="wrap_content" android:id="@+id/linearLayout1" android:orientation="vertical"
            android:layout_height="wrap_content">

            <DatePicker android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/datePicker" />
            <TimePicker android:id="@+id/timePicker" android:layout_width="wrap_content" android:layout_height="wrap_content" />

            <TableRow android:id="@+id/tableRow1" android:layout_height="wrap_content" android:layout_width="match_parent"
                android:gravity="center">

                <Button android:id="@+id/btnSetDateTime" android:layout_height="wrap_content" android:text="Set"
                    android:layout_width="wrap_content" />
                <Button android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Next"
                    android:id="@+id/btnNext1" />
            </TableRow>

        </LinearLayout>
    </ScrollView>

    <LinearLayout android:id="@+id/lldata" android:layout_weight="8" android:layout_width="fill_parent"
        android:layout_height="0dp" android:background="#FFFFFF">
    </LinearLayout>

    <LinearLayout android:id="@+id/llfooter" android:layout_width="fill_parent" android:orientation="horizontal"
        android:layout_height="20dp" android:visibility="visible" android:layout_margin="0dp">
    </LinearLayout>

</LinearLayout>



DateTimeActivity.java


public class DateTimeActivity extends Activity {

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.time_date);
        setTitle("Reminder");

        Button btnNext = (Button) findViewById(R.id.btnNext1);           
        btnNext.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent myintent = new  Intent(DateTimeActivity.this, Next.class);
                startActivity(myintent);
                finish();
            }
        });

        Button  btnSet = (Button) findViewById(R.id.btnSetDateTime);
        final   DatePicker dp = (DatePicker) findViewById(R.id.datePicker);
        final   TimePicker tp = (TimePicker) findViewById(R.id.timePicker);

        btnSet.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                String strDateTime = dp.getYear() + "-" + (dp.getMonth() + 1) + "-" + dp.getDayOfMonth() + " "+ tp.getCurrentHour() + ":" + tp.getCurrentMinute();

                Toast.makeText(DateTimeActivity.this, "User has selected " + strDateTime, Toast.LENGTH_LONG).show();

                finish();// move to previous activity
            }});

    }       

}

    



    

    
    
    

    

        

            

                

                    
0
投票

                    
                

            

        

        
创建日历实例，然后将 DatePicker 和 TimePicker 中的值分配给日历


calendar.timeInMillis 将返回准确的时间 mil


val calendar = Calendar.getInstance()
calendar.set(datePicker.year, datePicker.month+1, datePicker.dayOfMonth,
          timePicker.hour, timePicker.minute, 0) 
val millis = calendar.timeInMillis 

    

	

    

    


  

  

    
最新问题


  





  

    © www.soinside.com 2019 - 2024. All rights reserved.