SeekBar拖动条

SeekBar,拖动条，见到的较多，如地图上，放大缩小，音乐播放时声音的放大缩小等

实现较简单：

 

1. java代码：

 

public class SeekBarActivity  extends Activity{
	private SeekBar seekBar;
	private TextView status;
	private TextView values;
	
@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.seek_main);
	initModels();
	addListener();
}
public void addListener() {
	seekBar.setOnSeekBarChangeListener(new SeekListener());
}

//响应对应的事件
class SeekListener implements OnSeekBarChangeListener{

	@Override
	public void onProgressChanged(SeekBar seekBar, int progress,
			boolean fromUser) {
		seekBar.setSecondaryProgress(progress + 20);
		values.setText("当前值：" +  progress);
		status.setText("正在滑动");
	}

	@Override
	public void onStartTrackingTouch(SeekBar seekBar) {
		status.setText("开始滑动");
	}

	@Override
	public void onStopTrackingTouch(SeekBar seekBar) {
		status.setText("停止滑动");
	}
}

public void initModels() {
	seekBar = (SeekBar) findViewById(R.id.seekBar);
	status = (TextView) findViewById(R.id.currentStatus);
	values = (TextView) findViewById(R.id.currentValue);
}
}

 

2. xml代码：

 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
    <SeekBar 
        android:id="@+id/seekBar"
        android:max="100"
        android:progress="50"
        android:secondaryProgress="75"
        android:visibility="visible"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
	<TextView 
	    android:id="@+id/currentStatus"
	    android:text="当前状态"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    />
	<TextView 
	    android:id="@+id/currentValue"
	    android:text="当前值"
	    android:layout_width="fill_parent"
	    android:layout_height="wrap_content"
	    />
</LinearLayout>