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SeekBar是进度条。我们使用进度条时，可以使用系统默认的进度条；也可以自定义进度条的图片和滑块图片等。
下来是自定义thumb的seerBar，通过在drawable下写一个xml文件，做一个选择器。

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:state_pressed="true"android:drawable="@drawable/thumb_dn"/><item android:state_focused="true"android:drawable="@drawable/thumb_dn"/><item android:drawable="@drawable/thbum"/></selector>

 <SeekBarandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/seekBar"android:thumb="@drawable/thumb_bar"android:max="100"/>

然后在activity中实现SeekBar.OnSeekBarChangeListener的接口，重写方法。

ublic class Bofangyinyue extends AppCompatActivity implements View.OnClickListener,SeekBar.OnSeekBarChangeListener{SeekBar seekBar;ImageButton zuo,you,zanting;Bitmap bitmap;ImageView imageView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_bofangyinyue);Toolbar toolbar = (Toolbar)findViewById(R.id.bofangyinyue_tool);Intent intent = getIntent();String title = intent.getStringExtra("title");String artist = intent.getStringExtra("artist");toolbar.setTitle(title);toolbar.setSubtitle(artist);toolbar.setNavigationIcon(R.drawable.jiantou);setSupportActionBar(toolbar);seekBar = (SeekBar)findViewById(R.id.seekBar);zuo = (ImageButton)findViewById(R.id.zuo);you = (ImageButton)findViewById(R.id.you);zanting = (ImageButton)findViewById(R.id.zanting);zuo.setOnClickListener(this);you.setOnClickListener(this);zanting.setOnClickListener(this);seekBar.setOnSeekBarChangeListener(this);imageView = (ImageView)findViewById(R.id.bofangfengmian);int songid = intent.getIntExtra("songid",0);int albumid = intent.getIntExtra("albumid",-1);Log.d("issss",String.valueOf(albumid));bitmap = getMusic.getArtwork(getContentResolver(),songid,albumid,false,false);if(bitmap != null){imageView.setImageBitmap(bitmap);}else {imageView.setImageResource(R.drawable.largefengmian);}}@Overridepublic void onClick(View v) {switch (v.getId()){case R.id.zuo:break;case R.id.zanting:new LooperThread().start();break;case R.id.you:break;}}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {}class LooperThread extends Thread{int i = 10;@Overridepublic void run() {while(true){seekBar.setProgress(i);i+=10;Log.d("thread",String.valueOf(i));try{sleep(1000);}catch (InterruptedException e){e.printStackTrace();}}}}}

我们还可以自定义propress的样式，也是通过在drawable目录下，写一个xml文件。

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"><item android:id="@android:id/background"android:drawable="@drawable/bar_up"/><item android:id="@android:id/secondaryProgress" android:drawable="@drawable/bar_up"/><item android:id="@android:id/progress"android:drawable="@drawable/bar_dn"/></layer-list>

有关layer-list的用法见：
http://blog.csdn.net/qq_36391075/article/details/75278171)