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
Java代码
<?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：
Java代码
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());

        // 设置拖动条改变易做图
        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();
            }

        };

        // 为拖动条绑定易做图
        sb.setOnSeekBarChangeListener(osbcl);

    }
}

3、运行程序：

作者“lixiangyu”

补充：移动开发 , Android ,