Android入门之SeekBar

效果图：（可自由滑动）

 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >



    <SeekBar 

        android:id="@+id/firstSeekBar"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:max="100"

        />

</RelativeLayout>

 

package com.jkxqj.helloandroid;



import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;



public class MainActivity extends Activity {



	private SeekBar seekBar;

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		

		seekBar = (SeekBar)findViewById(R.id.firstSeekBar);

		seekBar.setProgress(30);

		seekBar.setSecondaryProgress(50);

		

		SeekBarListener listener = new SeekBarListener();

		seekBar.setOnSeekBarChangeListener(listener);

	}

	

	class SeekBarListener implements OnSeekBarChangeListener{



		/**

		 * seekBar 该对象指的是触发了监听器的SeekBar对象

		 * progress 指的是当前SeekBar的进度

		 */

		@Override

		public void onProgressChanged(SeekBar SeekBar, int progress, boolean fromUser) {

			System.out.println("progress:" + progress + ",fromUser:" + fromUser);

		}

		@Override

		public void onStartTrackingTouch(SeekBar seekBar) {

			System.out.println("onStart");

		}

		@Override

		public void onStopTrackingTouch(SeekBar seekBar) {

			System.out.println("onStop");

		}		

	}

	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.main, menu);

		return true;

	}



}