SeekBar

使用

1.layout  
<SeekBar  
    android:id="@+id/seek_bar"  
    android:layout_width="match_parent"  
    android:layout_height="wrap_content"  
    android:max="100"  
    android:progress="60"  
    android:minHeight="4dp"  
    android:maxHeight="4dp"  
    android:layout_marginStart="-20dp"  
    android:layout_marginEnd="-20dp"  
    android:thumb="@drawable/thumb"  
    android:progressDrawable="@drawable/progress"  
    app:layout_constraintTop_toBottomOf="@id/xxx"  
    app:layout_constraintStart_toStartOf="parent"  
    app:layout_constraintEnd_toEndOf="parent"/>  
  
2.thumb权柄  
<shape xmlns:android="http://schemas.android.com/apk/res/android"  
    android:shape="oval">
    <solid android:color="#FFFFFF"/>
    
    <size android:height="10dp"  
        android:width="10dp"/>  
</shape>  
  
3.progress  
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">  
    <item android:id="@android:id/background">  
        <shape>  
            <corners android:radius="3dp"/>
            
            <solid android:color="#5F5F5F"/>  
        </shape>  
    </item>  

    <item android:id="@android:id/progress">  
        <clip>  
            <shape>
                <corners android:radius="3dp"/>
                
                <gradient  
                    android:angle="0"  
                    android:endColor="#77D5E5"  
                    android:startColor="#77D5E5"/>  
            </shape>  
        </clip>  
    </item>  
</layer-list>  

问题：比实际宽度短

1. 设置margin负值

• android:layout_marginEnd="-20dp"

2. 调节padding

android:paddingStart="@dimen/dp_0"  
android:paddingEnd="@dimen/dp_0"