Camera camera = null;
Parameters parameters = null;

Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
}

};

// 主开启
public void start() {
handler.post(startThread);
handler.post(closeThread);
}

// 关闭
public void close() {
handler.removeCallbacks(startThread);
handler.removeCallbacks(closeThread);
flashclose();
camera.stopPreview();
camera.release();
camera = null;
}

private void flashopen() {//开启灯
if (camera == null) {
camera = Camera.open();
}
parameters = camera.getParameters();

parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);

camera.setParameters(parameters);
camera.startPreview();
}

private void flashclose() {//关闭灯
if (camera == null) {
camera = Camera.open();
}
parameters = camera.getParameters();

parameters.setFlashMode(Parameters.FLASH_MODE_OFF);

camera.setParameters(parameters);
}

Runnable startThread = new Runnable() {
// 将要执行的操作写在线程对象的run方法当中
public void run() {
System.out.println("updateThread");
flashopen();
try {
Thread.sleep(100);
flashclose();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
handler.post(startThread);
}

};

Runnable closeThread = new Runnable() {
// 将要执行的操作写在线程对象的run方法当中
public void run() {
flashclose();
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
handler.post(closeThread);
}

};

Android--sos闪光灯