Android SeekBar

SeekBar可以作为音乐播放器的进度指示和调整工具，音量调整工具等，SeekBar是ProgressBar的一个子类，下面我们用一个可以改变并显示当前进度的拖动条例子来演示一下它的使用：

1、main.xml

<?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"
>
    <SeekBar android:id="@+id/SeekBar01"
 android:layout_width=
"245px"
        android:layout_height="25px"
 android:paddingLeft=
"16px"
        android:paddingRight="15px"
 android:paddingTop=
"5px"
        android:paddingBottom="5px"
 android:progress=
"0"
 android:max=
"0"
        android:secondaryProgress="0"
 />
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
 android:text=
"@string/hello"
        android:id="@+id/TextView01"
 />
</LinearLayout>

2、java：

package
 com.esri.arcgis.sample;

import
 android.app.Activity;
import
 android.os.Bundle;
import
 android.widget.SeekBar;
import
 android.widget.SeekBar.OnSeekBarChangeListener;
import
 android.widget.TextView;
import
 android.widget.Toast;

public
 
class
 AndroidSeekBar 
extends
 Activity {
    /** Called when the activity is first created. */
    @Override
    public
 
void
 onCreate(Bundle savedInstanceState) {
        super
.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // 找到拖动条和文本框
        final
 SeekBar sb = (SeekBar) findViewById(R.id.SeekBar01);
        final
 TextView tv1 = (TextView) findViewById(R.id.TextView01);

        // 设置拖动条的初始值和文本框的初始值
        sb.setMax(100
);
        sb.setProgress(30
);
        tv1.setText("当前进度："
 + sb.getProgress());

        // 设置拖动条改变监听器
        OnSeekBarChangeListener osbcl = new
 OnSeekBarChangeListener() {

            @Override
            public
 
void
 onProgressChanged(SeekBar seekBar, 
int
 progress,
                    boolean
 fromUser) {
                tv1.setText("当前进度："
 + sb.getProgress());
                Toast.makeText(getApplicationContext(), "onProgressChanged"
,
                        Toast.LENGTH_SHORT).show();
            }

            @Override
            public
 
void
 onStartTrackingTouch(SeekBar seekBar) {
                Toast.makeText(getApplicationContext(), "onStartTrackingTouch"
,
                        Toast.LENGTH_SHORT).show();
            }

            @Override
            public
 
void
 onStopTrackingTouch(SeekBar seekBar) {
                Toast.makeText(getApplicationContext(), "onStopTrackingTouch"
,
                        Toast.LENGTH_SHORT).show();
            }

        };

        // 为拖动条绑定监听器
        sb.setOnSeekBarChangeListener(osbcl);

    }
}

3、运行程序：