Android------调用闪光灯当手电筒

package android.os;

/** {@hide} */
interface IHardwareService
{
// obsolete flashlight support
boolean getFlashlightEnabled();
void setFlashlightEnabled(boolean on);
}

package com.yf210yf.flashlight;

import java.lang.reflect.Method;

import android.app.Activity;
import android.os.Bundle;
import android.os.IBinder;
import android.os.IHardwareService;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;

public class FlashLightAvtivity extends Activity
{
private ImageButton imageButton;
private int i = 0;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
imageButton = (ImageButton) findViewById(R.id.imageButton);
setFlashlightEnabled(false);
imageButton.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
if (i == 0)
{
imageButton.setImageResource(R.drawable.light2);
setFlashlightEnabled(true);
i = 1;
} else
{
imageButton.setImageResource(R.drawable.light1);
setFlashlightEnabled(false);
i = 0;
}
}
});

}

/**
* 设置闪光灯的开启和关闭
*/
private void setFlashlightEnabled(boolean isEnable)
{
try
{
Method method = Class.forName("android.os.ServiceManager").getMethod("getService", String.class);
IBinder binder = (IBinder) method.invoke(null, new Object[] { "hardware" });

IHardwareService localhardwareservice = IHardwareService.Stub.asInterface(binder);
localhardwareservice.setFlashlightEnabled(isEnable);
}
catch (Exception e)
{
e.printStackTrace();
}

}

public boolean onKeyDown(int kCode,KeyEvent kEvent)
{
switch(kCode)
{
case KeyEvent.KEYCODE_BACK:
int pid = android.os.Process.myPid() ;
android.os.Process.killProcess(pid) ;
return true;
}
return super.onKeyDown(kCode,kEvent);
}

}