android:progressDrawable的作用

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效果图：

这里写图片描述

上为：SeekBar

下为：ProgressBar

布局：

<?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="match_parent"    android:orientation="vertical">    <SeekBar        android:id="@+id/sb"        android:layout_width="match_parent"        android:layout_height="30dp"        android:progressDrawable="@drawable/layer_list_seekbar" />    <ProgressBar        android:id="@+id/pb"        style="?android:attr/progressBarStyleHorizontal"        android:layout_width="match_parent"        android:layout_height="30dp"        android:progressDrawable="@drawable/layer_list_progressbar" /></LinearLayout>

注意：

 android:progressDrawable="@drawable/layer_list_progressbar"

该属性：设置进度中的背景颜色和进度颜色

layer_list_seekbar

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <item android:id="@android:id/background">        <shape>            <corners android:radius="3dp" />            <gradient            android:angle="270"            android:centerColor="#2B2B2B"            android:centerY="0.75"            android:endColor="#ff747674"            android:startColor="#ff9d9e9d" />            <solid android:color="#2B2B2B" />        </shape>    </item>    <item android:id="@android:id/progress">        <clip>            <shape>                <corners android:radius="3dp" />                <gradient                    android:angle="270"                    android:centerColor="#ff3399CC"                    android:centerY="0.75"                    android:endColor="#ff6699CC"                    android:startColor="#ff0099CC" />                <solid android:color="#2496F6" />            </shape>        </clip>    </item></layer-list>

layer_list_progressbar

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <item android:id="@android:id/background">        <shape>            <corners android:radius="2dp" />            <gradient                android:angle="270"                android:centerColor="@color/colorPrimaryDark"                android:endColor="#ff4801"                android:startColor="#f5f5f5" />        </shape>    </item>    <item android:id="@android:id/progress">        <clip>            <shape>                <corners android:radius="2dp" />                <gradient                    android:centerColor="#ff7612"                    android:endColor="#ff7612"                    android:startColor="#ff7612" />            </shape>        </clip>    </item></layer-list>

注意：

  <item android:id="@android:id/background">设置背景 <item android:id="@android:id/progress">设置进度

MainActivity

public class MainActivity extends AppCompatActivity {    private ProgressBar mPb;    private SeekBar mSb;    @RequiresApi(api = Build.VERSION_CODES.N)    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mPb = ((ProgressBar) this.findViewById(R.id.pb));        mSb = ((SeekBar) this.findViewById(R.id.sb));        mSb.setProgress(50);        mPb.setProgress(50, true);    }}

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