[DatePicker] Set cursor to end of input text field when input is opened

PiperOrigin-RevId: 766655654

Author: Material Design Team

lib/java/com/google/android/material/datepicker/RangeDateSelector.java

@@ -235,6 +235,11 @@ public View onCreateTextInputView(
     if (selectedStartItem != null) {
       startEditText.setText(format.format(selectedStartItem));
       proposedTextStart = selectedStartItem;
+      // Move the cursor to the end of the text field
+      CharSequence text = startEditText.getText();
+      if (text != null) {
+        startEditText.post(() -> startEditText.setSelection(text.length()));
+      }
     }
     if (selectedEndItem != null) {
       endEditText.setText(format.format(selectedEndItem));

lib/java/com/google/android/material/datepicker/SingleDateSelector.java

@@ -135,6 +135,11 @@ public View onCreateTextInputView(
     dateTextInput.setPlaceholderText(formatHint);
     if (selectedItem != null) {
       dateEditText.setText(format.format(selectedItem));
+      // Move the cursor to the end of the text field
+      CharSequence text = dateEditText.getText();
+      if (text != null) {
+        dateEditText.post(() -> dateEditText.setSelection(text.length()));
+      }
     }
 
     dateEditText.addTextChangedListener(

lib/javatests/com/google/android/material/datepicker/RangeDateSelectorTest.java

@@ -599,6 +599,21 @@ public void focusAndShowKeyboardAtStartup() {
     assertThat(shadowIMM.isSoftInputVisible()).isTrue();
   }
 
+  @Test
+  public void textField_shouldSetCursorToEndOfText() {
+    Calendar calendar = UtcDates.getUtcCalendar();
+    calendar.set(2025, Calendar.FEBRUARY, 1);
+    rangeDateSelector.setSelection(new Pair<>(calendar.getTimeInMillis(), null));
+    View root = getRootView();
+    ((ViewGroup) activity.findViewById(android.R.id.content)).addView(root);
+    TextInputLayout startTextInput = root.findViewById(R.id.mtrl_picker_text_input_range_start);
+    EditText editText = startTextInput.getEditText();
+
+    ShadowLooper.runUiThreadTasksIncludingDelayedTasks();
+
+    assertThat(editText.getSelectionStart()).isEqualTo(editText.getText().length());
+  }
+
   private View getRootView() {
     return rangeDateSelector.onCreateTextInputView(
         LayoutInflater.from(context),

lib/javatests/com/google/android/material/datepicker/SingleDateSelectorTest.java

@@ -345,6 +345,21 @@ public void focusAndShowKeyboardAtStartup() {
     assertThat(shadowIMM.isSoftInputVisible()).isTrue();
   }
 
+  @Test
+  public void textField_shouldSetCursorToEndOfText() {
+    Calendar calendar = UtcDates.getUtcCalendar();
+    calendar.set(2025, Calendar.FEBRUARY, 1);
+    singleDateSelector.setSelection(calendar.getTimeInMillis());
+    View root = getRootView();
+    ((ViewGroup) activity.findViewById(android.R.id.content)).addView(root);
+    TextInputLayout textInputLayout = root.findViewById(R.id.mtrl_picker_text_input_date);
+    EditText editText = textInputLayout.getEditText();
+
+    ShadowLooper.runUiThreadTasksIncludingDelayedTasks();
+
+    assertThat(editText.getSelectionStart()).isEqualTo(editText.getText().length());
+  }
+
   private View getRootView() {
     return singleDateSelector.onCreateTextInputView(
         LayoutInflater.from(context),