Android开发手册SeekBar拖动条使用实例

<TextView
    android:id="@+id/tvProgress"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="数值范围0~100之间，当前值：30"
    android:textSize="20sp" />
<SeekBar
    android:id="@+id/seekBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="20dp"
android:progress="30" />

seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        tvProgress.setText("数值范围0~100之间，当前值："+progress);
    }
    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
    }
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
    }
});

seekBar.setOnSeekBarChangeListener(object : OnSeekBarChangeListener {
           override fun onProgressChanged(seekBar: SeekBar, progress: Int, fromUser: Boolean) {
                tvProgress.setText("数值范围0~100之间，当前值：$progress")
            }
            override fun onStartTrackingTouch(seekBar: SeekBar) {}
            override fun onStopTrackingTouch(seekBar: SeekBar) {}
        })

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_bar);
    ProgressDialog pb = new ProgressDialog(this);
    pb.setMax(100);
    //点击外部是否可以被取消
    pb.setCancelable(true);
    //设置标题
    pb.setTitle("下载对话框");
    //设置中间文本内容
    pb.setMessage("正在下载中....");
    pb.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
    pb.show();
    //在show后调用
    pb.setProgress(50);
}

<SeekBar
    android:id="@+id/seekBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="20dp"
    android:progress="30"
    android:progressDrawable="@drawable/seekbar_one"
    android:thumb="@drawable/icon_xinsui" />
<SeekBar
    android:id="@+id/seekBarTwo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="20dp"
    android:progress="30"
    android:progressDrawable="@drawable/seekbar_two"
android:thumb="@drawable/icon_xinsui" />

<?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>
            <solid android:color="#33AADD" />
        </shape>
    </item>
    <item android:id="@android:id/secondaryProgress">
        <clip>
            <shape>
                <solid android:color="#3CC4C4" />
            </shape>
        </clip>
    </item>
    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <solid android:color="#00ff00" />
            </shape>
        </clip>
    </item>
</layer-list>

<?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="5dp"/>
        </shape>
        <!--    背景颜色-->
        <color android:color="#CCCCCC"/>
    </item>
    <item android:id="@android:id/progress">
        <clip
            android:clipOrientation="horizontal"
            android:gravity="left">
            <shape>
                <corners android:radius="5dp"/>
                <!--  开始颜色，中途颜色，最后颜色-->
                <gradient
                    android:startColor="#00FF00"
                    android:centerColor="#0000FF"
                    android:endColor="#FF0000"/>
            </shape>
        </clip>
    </item>
</layer-list>