java – Android：如何从日期和时间选择器获取值

我正在构建一个应用程序,我试图让用户选择时间,所以我使用了datePicker和timePicker以及一个按钮集.所以,当他点击设置按钮时,会出现一个对话框,说你选择了x日期和x时间,或者以任何方式在屏幕上显示消息,就像用户选择了这一次一样.所以我构建了代码,但随着我的应用程序进入该活动,它总是被强制停止.与显示数据相关的xml文件没有问题,因为当我评论从datePicker和timePicker获取值的 java行时,app绝对有效精细.
我仍然发布两个文件代码,以便于理解.还发布了日志猫异常.我删除了所有不必要的代码,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异常：

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

解决方法

不要做任何额外的事情,你的代码就是完美的.只需删除ScrollLayout的代码或其属性,无论您在哪里使用它.
Lemme从ScrollLayout为您编写更新的代码

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
            }});