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Android: how to get values ​​from date and time

I am creating an application in which I am trying to ask the user to select a time, so I used datePicker and timePicker and button set . Therefore, when he presses the set button , a dialog box appears and says that you have chosen the date x and x, or in some way a message similar to the user appears on the screen. So I built the code, but as my application comes to this action, it always forcibly stops. There is no problem with xml file related to data mapping, because when I comment on java strings to extract values ​​from datePicker and timePicker , the application works absolutely fine. However, I am sending both code files for easy understanding. also sending a log exception. I removed all unnecessary code, such as import and packages, as well as an extra button, etc. To make it readable.

This is the .xml file code

 <?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>

This is the code for TimeDate.java :

 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(); } }

This is the logcat exception:

 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
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4 answers

Do not do anything extra, your code is just a prefect. Just remove the ScrollLayout code or its attribute wherever you use it. Lemme write an updated code for you from 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 }});
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 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);

replace the line above below

 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);
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Your problem seems to be on this line:

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

You LinearLayout XML containing LinearLayout as the root of the node, however you produce it on a ScrollView by raising a ClassCastException .

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try the following code ....

time_date.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 }}); } }
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Source: https://habr.com/ru/post/914304/

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