SeekBarProject 拖動條

MyDemo.java

package com.jackie.seekbarproject;


import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;


public class MyDemo extends Activity {
private SeekBar seekBar = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.seekBar = (SeekBar)super.findViewById(R.id.seekBar);
this.seekBar.setMax(100);
this.seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListenerImpl());
}


private class OnSeekBarChangeListenerImpl implements OnSeekBarChangeListener {
 


@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
MyDemo.this.setScreenBrightness((float)seekBar.getProgress()/100);


}


@Override
public void onStartTrackingTouch(SeekBar seekBar) {
/*MyDemo.this.show.append("*** 開始拖動，當前值："+seekBar.getProgress()+"\n" );
*/
}


@Override
public void onStopTrackingTouch(SeekBar seekBar) {
/*MyDemo.this.show.append("*** 停止拖動，當前值："+seekBar.getProgress()+"\n" );*/

}

}

private void setScreenBrightness(float num){
WindowManager.LayoutParams layoutParams=getWindow().getAttributes();
layoutParams.buttonBrightness=num;//num爲0到1之間的浮點數 
super.getWindow().setAttributes(layoutParams);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my_demo, menu);
return true;

}

Main.xml

<LinearLayout 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:orientation="vertical"
    tools:context=".MyDemo" >
    <ImageView 
        android:id="@+id/pic"
        android:src="@drawable/pic_5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />


</LinearLayout>