Java 如何使LED手电筒在接到来电时闪烁?
我试图使LED闪光灯在设备接到来电时闪烁。这就是我在服务课上的表现Java 如何使LED手电筒在接到来电时闪烁?,java,android,Java,Android,我试图使LED闪光灯在设备接到来电时闪烁。这就是我在服务课上的表现 public class MyService extends Service { Camera cam = null; boolean offhook = false; @Override public IBinder onBind(Intent intent) { return null; } @Override public int onStartCommand(Intent intent, int flags,
public class MyService extends Service {
Camera cam = null;
boolean offhook = false;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String state = intent.getStringExtra("state");
if (TelephonyManager.EXTRA_STATE_RINGING.equals(state)) {
if (getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH) && !offhook) {
String myString = "01010101010101010101";
long blinkDelay = 50;
for (int i = 0; i < myString.length(); i++) {
if (myString.charAt(i) == '0') {
// params.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
cam = Camera.open();
Camera.Parameters p = cam.getParameters();
p.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
cam.setParameters(p);
} else {
// params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
offhook = true;
if (cam != null) {
cam.stopPreview();
cam.release();
cam = null;
}
this.stopSelf();
}
try {
Thread.sleep(blinkDelay);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
if (TelephonyManager.EXTRA_STATE_IDLE.equals(state)) {
if (!offhook) {
if (cam != null) {
cam.release();
cam = null;
}
this.stopSelf();
} else {
offhook = false;
}
}
if (TelephonyManager.EXTRA_STATE_OFFHOOK.equals(state)) {
offhook = true;
if (cam != null) {
cam.stopPreview();
cam.release();
cam = null;
}
this.stopSelf();
}
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
if (cam != null) {
cam.release();
cam = null;
}
super.onDestroy();
}
}
公共类MyService扩展服务{
摄像机摄像机=null;
布尔offhook=false;
@凌驾
公共IBinder onBind(意向){
返回null;
}
@凌驾
公共int onStartCommand(Intent Intent、int标志、int startId){
字符串状态=intent.getStringExtra(“状态”);
if(TelephonyManager.EXTRA_STATE_RINGING.equals(STATE)){
if(getPackageManager().hasSystemFeature(PackageManager.FEATURE\u摄像头\u闪光灯)&&&!offhook){
字符串myString=“01010101010101010101”;
长闪烁延迟=50;
对于(int i=0;i
但即使在我参加或拒绝通话后,眨眼也不会停止,因为这是一个for循环。我该怎么做呢?不要用onStartCommand编写代码,因为这个方法将在主线程上执行,所以很可能会得到ANR。
要停止LED闪烁,请在接听或拒绝呼叫时中断线程,并放置一个for循环中断,使其脱离循环。@carl Manaster:如何中断for循环?抱歉-这是@Ayanp的答案;我只是编辑它来整理语法。我不知道。在InterruptedException的catch块中,您可以放置break语句。您需要中断线程。。。从EXTRA_STATE_OFFHOOK为线程命名,如我前面所说,并调用threadname.interrupt