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;
    }

}