<span style="font-size:18px;"><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".MainActivity" ><SeekBarandroid:max="100"android:progress="30"android:id="@+id/seekBar1"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignParentLeft="true"android:layout_alignParentTop="true"android:layout_marginTop="60dp" /><TextViewandroid:id="@+id/textView1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignLeft="@+id/seekBar1"android:layout_below="@+id/seekBar1"android:layout_marginLeft="28dp"android:layout_marginTop="32dp"android:text="seek1"android:textAppearance="?android:attr/textAppearanceMedium" /><SeekBarandroid:id="@+id/seekBar2"android:max="100"android:secondaryProgress="60"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignParentLeft="true"android:layout_below="@+id/textView1"android:layout_marginTop="67dp" /><TextViewandroid:id="@+id/textView2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignLeft="@+id/textView1"android:layout_below="@+id/seekBar2"android:layout_marginTop="28dp"android:text="seek2"android:textAppearance="?android:attr/textAppearanceMedium" /></RelativeLayout>
</span>

java文件

<span style="font-size:18px;">package com.example.seekbar;import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;public class MainActivity extends Activity implements OnSeekBarChangeListener{private TextView textView1,textView2;private SeekBar seekBar1,seekBar2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView1=(TextView)this.findViewById(R.id.textView1);textView2=(TextView)this.findViewById(R.id.textView2);seekBar1=(SeekBar)this.findViewById(R.id.seekBar1);seekBar2=(SeekBar)this.findViewById(R.id.seekBar2);seekBar1.setOnSeekBarChangeListener(this);seekBar2.setOnSeekBarChangeListener(this);}@Overridepublic void onProgressChanged(SeekBar seekBar, int position, boolean flag) {// TODO Auto-generated method stubif (seekBar.getId()==seekBar1.getId()){textView1.setText("当前seekbar1刻度"+position);}else {textView2.setText("当前seekbar2刻度"+position);}}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubif (seekBar.getId()==seekBar1.getId()){textView1.setText("開始滑动seek1");}else {textView2.setText("開始滑动seek2");}}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubif (seekBar.getId()==seekBar1.getId()){textView1.setText("停止滑动seek1");}else {textView2.setText("停止滑动seek2");}}}
</span>

效果图

<span style="font-size:18px;"><RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".MainActivity" ><TextViewandroid:id="@+id/textView1"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_alignParentTop="true"android:layout_centerHorizontal="true"android:layout_marginTop="24dp"android:text="调节手机亮度" /><SeekBarandroid:max="100"android:id="@+id/seekBar1"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignLeft="@+id/textView1"android:layout_below="@+id/textView1"android:layout_marginTop="117dp"android:progress="50" /></RelativeLayout></span>

ＪＡＶＡ文件

<span style="font-size:18px;">package com.example.seekbardemo;import android.app.Activity;
import android.os.Bundle;
import android.view.WindowManager;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;public class MainActivity extends Activity implements OnSeekBarChangeListener {
private SeekBar myseekBar;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);myseekBar=(SeekBar)this.findViewById(R.id.seekBar1);myseekBar.setOnSeekBarChangeListener(this);}@Overridepublic void onProgressChanged(SeekBar seekBar, int position, boolean flag) {// TODO Auto-generated method stub}
//调节亮度的方法private void setScreenBrightness(float num) {WindowManager.LayoutParams layoutParams = getWindow().getAttributes();       // 取得window属性layoutParams.screenBrightness = num;          // num已经除以100super.getWindow().setAttributes(layoutParams); // 0~1之间}@Overridepublic void onStartTrackingTouch(SeekBar arg0) {// TODO Auto-generated method stub}//在拖动结束是使用getProgress获得当前的Progress值来设置亮度@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {// TODO Auto-generated method stubif (seekBar.getId()==myseekBar.getId()) {
//          将progress除以100并转换为float类型setScreenBrightness((float)seekBar.getProgress()/100);}}}
</span>

效果图