Android 高級控件學習--SeekBar

Android 高級控件學習--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
{
	//聲明SeekBar對象
    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對象
		mSeekBar = (SeekBar) findViewById(R.id.seek);
		mSeekBar.setOnSeekBarChangeListener(this);
		mProgressText = (TextView) findViewById(R.id.progress);
		mTrackingText = (TextView) findViewById(R.id.tracking);
	}

	//在拖動中--即值在改變
	public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch)
	{
		mProgressText.setText("當前值："+progress);
	}
	public void onStartTrackingTouch(SeekBar seekBar)
	{
		mTrackingText.setText("正在調節");
	}
	//停止拖動
	public void onStopTrackingTouch(SeekBar seekBar)
	{
		mTrackingText.setText("停止調節");
	}
}

一、SeekBar可拖動當前值，一共三層，黃色、淺黃色、灰色，分別由

        android:progress="50"

        android:secondaryProgress="75"

        android:max="100"

控制

二、監聽器可由class實現監聽器接口來完成監聽

public class Activity01 extends Activity
                        implements SeekBar.OnSeekBarChangeListener

//在拖動中--即值在改變
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch)
    {
        mProgressText.setText("當前值："+progress);
    }
    public void onStartTrackingTouch(SeekBar seekBar)
    {
        mTrackingText.setText("正在調節");
    }
    //停止拖動
    public void onStopTrackingTouch(SeekBar seekBar)
    {
        mTrackingText.setText("停止調節");
    }