Android 高级控件学习--SeekBar
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/seek"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:max="100"
android:progress="50"
android:secondaryProgress="75" />
<TextView android:id="@+id/progress"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<TextView android:id="@+id/tracking"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
Activity01.java
package com.lxt008;
import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;
public class Activity01 extends Activity
implements SeekBar.OnSeekBarChangeListener
{
//声明SeekBar对象
SeekBar mSeekBar;
TextView mProgressText;
TextView mTrackingText;
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//取得SeekBar对象
mSeekBar = (SeekBar) findViewById(R.id.seek);
mSeekBar.setOnSeekBarChangeListener(this);
mProgressText = (TextView) findViewById(R.id.progress);
mTrackingText = (TextView) findViewById(R.id.tracking);
}
//在拖动中--即值在改变
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch)
{
mProgressText.setText("当前值:"+progress);
}
public void onStartTrackingTouch(SeekBar seekBar)
{
mTrackingText.setText("正在调节");
}
//停止拖动
public void onStopTrackingTouch(SeekBar seekBar)
{
mTrackingText.setText("停止调节");
}
}
一、SeekBar可拖动当前值,一共三层,黄色、浅黄色、灰色,分别由
android:progress="50"
android:secondaryProgress="75"
android:max="100"
控制
二、监听器可由class实现监听器接口来完成监听
public class Activity01 extends Activity
implements SeekBar.OnSeekBarChangeListener
//在拖动中--即值在改变
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch)
{
mProgressText.setText("当前值:"+progress);
}
public void onStartTrackingTouch(SeekBar seekBar)
{
mTrackingText.setText("正在调节");
}
//停止拖动
public void onStopTrackingTouch(SeekBar seekBar)
{
mTrackingText.setText("停止调节");
}