[Android] SeekBar---可拖动进度条

SeekBar---可拖动进度条

（1）setMax                        //设置SeekBar最大数值
（2）setProgress                 //设置SeekBar当前数值
（3）setSecondaryProgress//设置SeekBar第二数值   

监听器:

seekBar = (SeekBar) findViewById(R.id.seekBar);
seekBar.setOnSeekBarChangeListener(this);
// 数值改变
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
        // TODO Auto-generated method stub 
    }

    // 开始拖动
    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub 
    }

    // 停止拖动
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
    }

自定义SeekBar进度条的样式：

android:progressDrawable="@drawable/seekbar_img"//改变进度条的样式
android:thumb="@drawable/thumb"//改变滑块的样式

下面贴上实例工程代码（自定义处仅演示修改改变滑块的样式）：

MainActivity.java：

package com.Liuyt.s03_e21_seekbar;

import android.app.Activity;
import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;

public class MainActivity extends Activity implements OnSeekBarChangeListener {

    private SeekBar seekBar;
    private TextView tv1;
    private TextView tv2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        seekBar = (SeekBar) findViewById(R.id.seekBar);
        tv1 = (TextView) findViewById(R.id.textView1);
        tv2 = (TextView) findViewById(R.id.textView2);
        seekBar.setOnSeekBarChangeListener(this);
    }

    // 数值改变
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
        // TODO Auto-generated method stub
        tv1.setText("正在改变");
        tv2.setText("当前数值"+progress);
    }

    // 开始拖动
    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
        tv1.setText("开始改变");
    }

    // 停止拖动
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub
        tv1.setText("停止改变");
    }

}

main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <SeekBar
        android:thumb="@drawable/my_thumb"
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="300"
        android:progress="100" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

my_thumb.xml  (selector 用于自定义滑块的一个效果)：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/select" android:state_focused="true" android:state_window_focused="true"></item>
    <item android:drawable="@drawable/select" android:state_pressed="true" android:state_window_focused="true"></item>
    <item android:drawable="@drawable/select" android:state_selected="true" android:state_window_focused="true"></item>
    <item android:drawable="@drawable/normal"></item>

</selector>