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復制代碼代碼如下:

public class HandLightActivity extends Activity implements OnClickListener{
private ToggleButton toggleButton;
private Camera m_Camera;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.handlight);
toggleButton = (ToggleButton)this.findViewById(R.id.toggleButton1);
toggleButton.setOnClickListener(this);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
}
@Override
public void onClick(View v) {
ToggleButton tb = (ToggleButton)v;
if(!tb.isChecked()){
PackageManager pm= this.getPackageManager();
FeatureInfo[] features=pm.getSystemAvailableFeatures();
for(FeatureInfo f : features)
{
if(PackageManager.FEATURE_CAMERA_FLASH.equals(f.name))   //判斷設備是否支持閃光燈
{
if ( null == m_Camera )
    {
        m_Camera = Camera.open();
    }

    Camera.Parameters parameters = m_Camera.getParameters();
    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
    m_Camera.setParameters( parameters );
    m_Camera.startPreview();
toggleButton.setBackgroundColor(0x30ffffff);
}
}
}else{
if ( m_Camera != null )
   {
       m_Camera.stopPreview();
       m_Camera.release();
       m_Camera = null;
   }
toggleButton.setBackgroundColor(0xffffffff);
}
}
}

handlight.xml

復制代碼代碼如下:

<?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" >
    <ToggleButton android:id="@+id/toggleButton1"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:checked="true"
        android:text="ToggleButton"/>
</LinearLayout>

需要加上權限
<uses-permission android:name="android.permission.FLASHLIGHT"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-permission android:name="android.hardware.camera"/>
注意：并不是所有的設備都支持

網上還有一種說法是調用系統隱藏api，不過我試了沒反應，可能是系統版本問題，備份一下
用IHardwareService直接控制
Android1.5以前是直接提供這個接口的，之后呢，需要我們自己來做一下。
在你的項目中新建一個包Android.os,新建一個IHardwareService.aidl文件，內容如下：

復制代碼代碼如下:

package android.os;

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

然后在你的程序中引入

復制代碼代碼如下:

import android.os.IHardwareService;

    /**
     * 設置閃光燈的開啟和關閉
     * @param isEnable
     * @author linc
     * @date 2012-3-18
     */
    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();
        }

    }