ANDROID_MARS学习笔记_S01_012_SeekBar

1.xml

 <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>

2.java

 package com.marschen.s01_e18_seekbar;

 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
          * fromUser
          */
         @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;
     }

 }