利用Drawable资源 定制改变外观的Seekbar

package com.test.layerdrawable;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }}

布局文件

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.test.layerdrawable.MainActivity">    <SeekBar        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="10dp"        android:max="100"        android:progressDrawable="@drawable/my_bar"        />    <ImageView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/layout_logo"        /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <!--定义轨道背景色-->    <item android:id="@android:id/background" android:drawable="@drawable/grow" />    <!--定义轨道上已完成的外观-->    <item android:id="@android:id/progress" android:drawable="@drawable/ok" /></layer-list>

---

<?xml version="1.0" encoding="utf-8"?><layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <item>        <bitmap            android:gravity="center"            android:src="@drawable/ic_launcher" />    </item>    <item android:top="25dp" android:left="25dp" >        <bitmap android:src="@drawable/ic_launcher" android:gravity="center" />    </item>    <item android:top="50dp" android:left="50dp" >        <bitmap android:src="@drawable/ic_launcher" android:gravity="center" />    </item></layer-list>