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[英]java.lang.RuntimeException: Only one Looper may be created per thread
[英]How to resolve this error in android - java.lang.RuntimeException: Only one Looper may be created per thread
这是我在后台服务中的代码
public class BackgroundService extends Service {
private int interval1 = 60; // 60 seconds
private int interval2 = 60; // 60 seconds
//=============================================================================================================================
private Handler mTimer1 = new Handler();
private Runnable mTask1 = new Runnable() {
public void run() {
Looper.prepare();
Log.w("GPS Tracker", "Tracker going to run "+new Date());
LocationManager mlocManager =(LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);//, Looper.getMainLooper());
mTimer1.postDelayed(this, interval1 * 1000L);
Looper.loop();
}
};
//=============================================================================================================================
private Handler mTimer2 = new Handler();
private Runnable mTask2 = new Runnable() {
public void run() {
if (isOnline() == true) {
Log.w("Method 2", "setUpdateCardAcceptTag");
setUpdateCardAcceptTag();
Log.w("Method 3", "getCardBulkSerialData");
getCardBulkSerialData();
Log.w("Method 12", "updateStockDataFromRemote");
updateStockDataFromRemote();
Log.w("Method 5", "SetRemarksData");
SetRemarksData();
Log.w("Method 6", "SetCardSaleData");
SetCardSaleData();
Log.w("Method 7", "synchMerchants");
synchMerchants();
Log.w("Method 9", "getUpdatedCities");
getUpdatedCities();
Log.w("Method 10", "getNotifications");
getNotifications();
Log.w("Method 11", "getNextSerialDetails");
getNextSerialDetails();
Log.w("Method 12", "getNextSerialDetails");
//synchLocations();
Log.w("Method 13", "synchLocations");
}
mTimer2.postDelayed(this, interval2 * 1000L);
}
};
当我运行应用程序时,它在几秒钟后停止。在日志控制台中说下面的错误消息请帮我解决这个问题
谢谢
您无法多次为Thread
准备Looper
。 在准备之前,Chcek是否Looper
与该Thread
相关联。
private Runnable mTask1 = new Runnable() {
public void run() {
if(Looper.myLooper() == null) { // check already Looper is associated or not.
Looper.prepare(); // No Looper is defined So define a new one
}
Log.w("GPS Tracker", "Tracker going to run "+new Date());
LocationManager mlocManager =(LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);//, Looper.getMainLooper());
mTimer1.postDelayed(this, interval1 * 1000L);
Looper.loop();
}
};
因为当一个活动或服务(它们都扩展了ContextWrapper
,扩展了Context
)是由android创建的时候,也会创建一个Loopper
对象。
在您的代码中,您使用Looper.prepare();
但它真正做到了什么?
public static void prepare() {
prepare(true);
}
private static void prepare(boolean quitAllowed) {
if (sThreadLocal.get() != null) {
throw new RuntimeException("Only one Looper may be created per thread");
}
sThreadLocal.set(new Looper(quitAllowed));
}
(你可以在Looper.java中找到这段代码)
因为android os已经调用了mLooper.prepare();
创建服务时的方法,因此sThreadLocal
有一个Looper对象。当您的代码执行时,将抛出RuntimeException
。
Handler在创建Handler的线程中运行'runnable'。 你有2个处理程序..它们在同一个线程中。 我猜他们在主线程..并且主线程已经有一个looper ..尝试删除“Looper.Prepare”和“Looper.Loop”调用。
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