Android SeekBar can't be full width even set padding 0 in AppCompat 23.1.0

Question

when I update android support lib from 23.0.1 to 23.1.0, I find the SeekBar is not full width any more.

this is the test XML file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:divider="@drawable/space_divider"
    android:orientation="vertical"
    android:padding="8dp"
    android:showDividers="middle">

    <View
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:background="@android:color/black"/>

    <!-- default SeekBar -->
    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:progress="50"
        android:progressTint="@android:color/holo_red_dark"/>

    <!-- padding=0 -->
    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:padding="0dp"
        android:progress="50"
        android:progressTint="@android:color/holo_red_dark"/>

    <!-- padding=40 -->
    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:padding="40dp"
        android:progress="50"
        android:progressTint="@android:color/holo_red_dark"/>

    <android.support.v7.widget.AppCompatSeekBar
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:padding="0dp"
        android:progress="50"/>

</LinearLayout>

It works well under support lib 23.0.1, like following screenshot. SeekBar has default padding, when I set padding=0 manual, it can be full width. and AppCompatSeekBar is not exist yet.

but under support lib 23.1.0, whether I set how much of padding, SeekBar and AppCompatSeekBar has no any change, like following screenshot.

so, is this the bug of support lib, any body meet this problem and how to resolve it?

thank you~!

update:
It totally confused me, I just have another test, I create a new project, whether I use AppCompat 23.0.1 or 23.1.0, SeekBar neither can be full width after set padding=0, (the compileSdkVersion is 23, buildToolsVersion is "23.0.1", targetSdkVersion is 23). anyway, I want to know how to make SeekBar full width when set padding=0 not work.

the build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        applicationId "com.test.seekbar"
        minSdkVersion 14
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.0.1'
}

Answer 1

finally, I just have a sudden thought. why not try modify it by java code. It works! following is the sample code:

protected void initViews(Context context) {
    LayoutInflater.from(context).inflate(getLayoutResId(), this);
    ButterKnife.bind(this);

    // set style, just once
    seekBar.setProgress(0);
    seekBar.setMax(0);

    seekBar.setPadding(0, 0, 0, 0);

    // ...
}

Answer 2

Set this attributes in XML

android:paddingStart="0dp" 

Answer 3

Try adding the parameters paddingStart and paddingEnd to 0dp in the xml file. If your app is compatible with Rtl you will need to add those in order to visualize the seekBar with no padding otherwise it will show with padding even if using it in a Ltr language.

Answer 4

As Didac mentioned you can set the padding to 0 in xml.

But make sure you set the padding after you set the progressTint or progressDrawable.

I had a similar problem (where I was setting progressDrawable). Once I set the padding as 0 after setting the progressDrawable, the seekbar padding has gone

Answer 5

if you seekBar.setPadding(0, 0, 0, 0); may be the thumb can't show complete。 First, you should find what result this. In fact, in the seek bar style, you can find this.

<style name="Base.Widget.AppCompat.SeekBar" parent="android:Widget">
    <item name="android:indeterminateOnly">false</item>
    <item name="android:progressDrawable">@drawable/abc_seekbar_track_material</item>
    <item name="android:indeterminateDrawable">@drawable/abc_seekbar_track_material</item>
    <item name="android:thumb">@drawable/abc_seekbar_thumb_material</item>
    <item name="android:focusable">true</item>
    <item name="android:paddingLeft">16dip</item>
    <item name="android:paddingRight">16dip</item>
</style>

so change the style with paddingLeft and paddingRight