seekbar拖动条控件

seekbar拖动条控件可以通过拖动条改变当前的值，可以用seebar设置具有一定范围的变量值。如:

在.xml文件中:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView android:id="@+id/textview1" android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <TextView android:id="@+id/textview2" android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <SeekBar android:id="@+id/seekbar1" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:max="100"
        android:progress="30"></SeekBar>

    <SeekBar android:id="@+id/seekbar2" android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:max="100"
        android:progress="30" android:secondaryProgress="60"></SeekBar>
</LinearLayout>

在.java文件中:

public class Main extends Activity implements OnSeekBarChangeListener {
    /** Called when the activity is first created. */
    private TextView textView1, textView2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        textView1 = (TextView) this.findViewById(R.id.textview1);
        textView2 = (TextView) this.findViewById(R.id.textview2);
        SeekBar seekBar1 = (SeekBar) this.findViewById(R.id.seekbar1);
        SeekBar seekBar2 = (SeekBar) this.findViewById(R.id.seekbar2);
        seekBar1.setOnSeekBarChangeListener(this);
        seekBar2.setOnSeekBarChangeListener(this);
    }

    // 当滑动滑竿的时候会触发的事件
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
        // TODO Auto-generated method stub
        if (seekBar.getId() == R.id.seekbar1) {
            textView1.setText("seekbar1的当前位置是：" + progress);
        } else {
            textView2.setText("seekbar2的当前位置是：" + progress);
        }
    }

    // 表示从哪里开始拖动
    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
        if (seekBar.getId() == R.id.seekbar1) {
            textView1.setText("seekbar1开始拖动");
        } else {
            textView1.setText("seekbar2开始拖动");
        }
    }

    // 表示从哪里结束拖动
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
        if (seekBar.getId() == R.id.seekbar1) {
            textView1.setText("seekbar1停止拖动");
        } else {
            textView1.setText("seekbar2停止拖动");
        }
    }
}

运行结果：