Android(安卓)SeekBar

16lz 2021-01-26

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

<?xmlversion= "1.0" encoding= "utf-8" ?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width= "fill_parent"
android:layout_height="fill_parent" >
<SeekBarandroid: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" />
<TextViewandroid: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{
/**Calledwhentheactivityisfirstcreated.*/
@Override
public void onCreate(BundlesavedInstanceState){
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
//找到拖动条和文本框
final SeekBarsb=(SeekBar)findViewById(R.id.SeekBar01);
final TextViewtv1=(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
OnSeekBarChangeListenerosbcl=new OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBarseekBar, int progress,
boolean fromUser){
tv1.setText("当前进度：" +sb.getProgress());
Toast.makeText(getApplicationContext(),"onProgressChanged" ,
Toast.LENGTH_SHORT).show();
}
@Override
public void onStartTrackingTouch(SeekBarseekBar){
Toast.makeText(getApplicationContext(),"onStartTrackingTouch" ,
Toast.LENGTH_SHORT).show();
}
@Override
public void onStopTrackingTouch(SeekBarseekBar){
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：

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