Я хочу анимировать текст в моем текстовом переключателе. Я просмотрел все вопросы по стеку и документацию, но они не решили мою проблему.
Вот мой XML:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/tv__inc_pre_sing__screen_title"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="#fff"
android:gravity="center"
android:text="PRACTICE"
android:textAllCaps="true"
android:textColor="@color/colorAccent"
android:textSize="16dp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<android.support.constraint.ConstraintLayout
android:id="@+id/rl__inc_pre_sing__tm_container"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:animateLayoutChanges="true"
android:background="#efff"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/tv__inc_pre_sing__screen_title">
<ImageView
android:id="@+id/tv__inc_pre_sing__quotation_mark"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:src="@drawable/ic_archive_black_24dp"
app:layout_constraintTop_toTopOf="parent" />
<TextSwitcher
android:id="@+id/tv__inc_pre_sing__teacher_message"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginStart="24dp"
android:layout_marginTop="16dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="@id/tv__inc_pre_sing__quotation_mark"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
android:src="@drawable/ic_archive_black_24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/tv__inc_pre_sing__teacher_message" />
</android.support.constraint.ConstraintLayout>
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:text="Click Me"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
<View
android:layout_width="0dp"
android:layout_height="16dp"
android:background="@drawable/ic_launcher_background"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/rl__inc_pre_sing__tm_container" />
</android.support.constraint.ConstraintLayout>
Вот мой код
public class Main3Activity extends AppCompatActivity {
private TextSwitcher mSwitcher;
Button btnNext;
int currentIndex=-1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
Resources resources = getApplicationContext().getResources();
final String[] textString = resources.getStringArray(R.array.teacher_messages);
btnNext = findViewById(R.id.button);
mSwitcher = findViewById(R.id.tv__inc_pre_sing__teacher_message);
mSwitcher.setFactory(new ViewSwitcher.ViewFactory() {
public View makeView() {
// TODO Auto-generated method stub
// create new textView and set the properties like clolr, size etc
TextView myText = new TextView(Main3Activity.this);
myText.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
myText.setTextColor(Color.BLUE);
return myText;
}
});
// Declare the in and out animations and initialize them
Animation in = AnimationUtils.loadAnimation(this,android.R.anim.slide_in_left);
Animation out = AnimationUtils.loadAnimation(this,android.R.anim.slide_out_right);
// set the animation type of textSwitcher
mSwitcher.setInAnimation(in);
mSwitcher.setOutAnimation(out);
// ClickListener for NEXT button
// When clicked on Button TextSwitcher will switch between texts
// The current Text will go OUT and next text will come in with specified animation
btnNext.setOnClickListener(new View.OnClickListener() {
//
public void onClick(View v) {
// TODO Auto-generated method stub
currentIndex++;
// If index reaches maximum reset it
if(currentIndex==textString.length)
currentIndex=0;
mSwitcher.setText(textString[currentIndex]);
((ViewGroup) findViewById(R.id.rl__inc_pre_sing__tm_container)).getLayoutTransition()
.enableTransitionType(LayoutTransition.CHANGING);
}
});
}
}
Анимация в ConstraintLayout с идентификатором rl__inc_pre_sing__tm_container не работает должным образом. Предположим, что мой TextSwitcher имеет текст, длина которого больше 3, а затем TextSwitcher показывает текст, длина которого равна 1, тогда ConstraintLayout не анимируется, если следующий текст имеет длину 1, то анимация ограничения ограничений анимируется.
Я не могу понять это странное поведение.