利用ConstraintLayout轻松实现横向进度条

Android

public class HorizontalProgressBar extends ConstraintLayout {
    private View bar;
    public HorizontalProgressBar(@NonNull Context context) {
        super(context);
        initView();
    }
    public HorizontalProgressBar(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        initView();
    }
    public HorizontalProgressBar(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView();
    }
    private void initView() {
        LayoutInflater.from(getContext()).inflate(R.layout.layout_horizon_progress_bar, this);
        bar = findViewById(R.id.view_bar);
    }
    public void setPercent(float percent) {
        if (percent > 1) {
            percent = 1;
        }
        ConstraintLayout.LayoutParams params = (LayoutParams) bar.getLayoutParams();
        params.horizontalBias = percent;
        bar.setLayoutParams(params);
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/cl_bg"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/shape_btn_half_round">
    <View
        android:id="@+id/view_bar"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:background="@drawable/shape_btn_half_round_grey"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.0"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintWidth_percent="0.5" />
</androidx.constraintlayout.widget.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="#8A96B0" />
    <!-- 圆角 -->
    <corners
        android:bottomLeftRadius="@dimen/dimen_19dp"
        android:bottomRightRadius="@dimen/dimen_19dp"
        android:topLeftRadius="@dimen/dimen_19dp"
        android:topRightRadius="@dimen/dimen_19dp" />
</shape>