mreichelt :
In our application we need an indeterminate progress bar, like so:
We can achieve this by setting a negative margin on the ProgressBar, like this:
<ProgressBar
android:id="@+id/progressbar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:indeterminate="true"
android:marginTop="-7dp"
android:visibility="@{loading ? View.VISIBLE : View.GONE}" />
BUT because ConstraintLayout does not support negative margins, it will look like this:
OK, the negative margin was a hack. Let's replace it with a different hack, shall we? Let's introduce our custom view CustomProgressBar, which extends ProgressBar and overrides its onDraw method, like this:
@Override
protected void onDraw(Canvas canvas) {
int marginTop = dpToPx(7);
canvas.translate(0, -marginTop);
super.onDraw(canvas);
}
But all of this smells like bad code. There has to be a better solution! What would you recommend?
hoford :
Another way to do this is to use a Guideline and center ProgressBar between the parent top and the guideline.
<ProgressBar
android:id="@+id/progressBar2"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="0dp"
android:paddingTop="-4dp"
android:layout_height="wrap_content"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toTopOf="@+id/guideline"
app:layout_constraintTop_toTopOf="parent" />
<android.support.constraint.Guideline
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/guideline"
android:orientation="horizontal"
app:layout_constraintGuide_begin="4dp" />
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