Android控件之-SeekBar_移动开发_编程开发_程序员俱乐部

拖动条类似于进度条，但是进度条不可以控制。

拖动条可以被用户控制，在SeekBar中要监听3个事件。

分别是：

1.数值的改变（onProgressBar）

2.开始拖动（onStarTrackingTouch）

3.停止拖动（onStopTrackingTouch）

package com.ko8e;

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

public class MyActivity extends Activity {
    /** Called when the activity is first created. */
	TextView textView1 = null;
	TextView textView2 = null;
	SeekBar sb = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        textView1 = (TextView) findViewById(R.id.textView1);
        textView2 = (TextView) findViewById(R.id.textView2);
        sb = (SeekBar) findViewById(R.id.seekBar);
        
        textView1.setText("初始值：" + sb.getProgress());
        sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
			
			public void onStopTrackingTouch(SeekBar seekBar) {
				Toast.makeText(getApplicationContext(), "onStopTrackingTouch", Toast.LENGTH_SHORT).show();
			}
			
			public void onStartTrackingTouch(SeekBar seekBar) {
				Toast.makeText(getApplicationContext(), "onStartTrackingTouch", Toast.LENGTH_SHORT).show();
			}
			
			public void onProgressChanged(SeekBar seekBar, int progress,
					boolean fromUser) {
				textView2.setText("当前进度值：" + sb.getProgress());
				Toast.makeText(getApplicationContext(), "onProgressChanged", Toast.LENGTH_SHORT).show();
			}
		});
        
    }
    
}

?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/seekBar"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:max="100"
	android:progress="30"
	android:secondaryProgress="70"
	/>
	<TextView  
	android:id="@+id/textView1"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
    <TextView  
	android:id="@+id/textView2"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
</LinearLayout>