Android 在Plugin.execute()内实例化AsyncTask时出现异常InInitializeError
我正在开发一个应用程序,在里面我使用Android 在Plugin.execute()内实例化AsyncTask时出现异常InInitializeError,android,plugins,android-asynctask,cordova-2.0.0,Android,Plugins,Android Asynctask,Cordova 2.0.0,我正在开发一个应用程序,在里面我使用cordovaApi在Senchacode和*Android原生代码*之间进行通信 在我的插件的execute方法中,我启动了一个AsyncTask(用于设备注册),但我在第36行中得到了异常initializerror(任务设备注册的实例) 注册设备插件: public class DeviceRegistrationPlugin extends Plugin { public static final String TAG = "DeviceRe
cordova
Api在Sencha
code和*Android原生代码*
之间进行通信
在我的插件的execute
方法中,我启动了一个AsyncTask
(用于设备注册),但我在第36行中得到了异常initializerror
(任务设备注册的实例)
注册设备插件:
public class DeviceRegistrationPlugin extends Plugin {
public static final String TAG = "DeviceRegistrationPlugin";
public static final String ACTION_REGISTER_DEVICE = "registerDeviceAction";
protected String callBackMethod;
@Override
public PluginResult execute(String action, JSONArray args, String callBackId) {
String token;
if(action.equals(ACTION_REGISTER_DEVICE)) {
try {
token = args.getString(0);
if(token != null) {
// launch the task to register device
SharedPreferences prefs = cordova.getActivity().getSharedPreferences(WebServiceRequest.PREFS_IDENTIFICATION, Context.MODE_PRIVATE);
prefs.edit().putString(WebServiceRequest.PREF_TOKEN_PARAM, token).commit();
TaskRegisterDevice task = new TaskRegisterDevice(cordova.getActivity());// this is the line 36
task.execute();
// tell the plugin that the callBack will be executed after the task
// has finished his work.
this.callBackMethod = callBackId;
PluginResult pluginResult = new PluginResult(PluginResult.Status.NO_RESULT);
pluginResult.setKeepCallback(true);
return pluginResult;
}
else {
return new PluginResult(Status.ERROR, "token required");
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return new PluginResult(PluginResult.Status.JSON_EXCEPTION);
}
}
else {
// invalid action sended to the plugin
return new PluginResult(PluginResult.Status.INVALID_ACTION);
}
}
/**
* asynctask to register the device
* @author houcine
*
*/
class TaskRegisterDevice extends AsyncTask<Void, Void, Boolean> {
protected Context context;
public TaskRegisterDevice(Context context) {
this.context = context;
}
@Override
protected Boolean doInBackground(Void... params) {
try {
return WebServiceRequest.RegisterDevice(context);
} catch (JSONException e) {
e.printStackTrace();
return true;
} catch (IOException e) {
e.printStackTrace();
return true;
}
}
@Override
protected void onPostExecute(Boolean result) {
// return new plugin result when synchronization done
Log.d(TAG, "resultat DeviceRegistration : "+result + " , \ncallBackMethod : "+callBackMethod);
PluginResult pluginResult = new PluginResult(
PluginResult.Status.OK, result);
pluginResult.setKeepCallback(false);
success(pluginResult, callBackMethod);
}
}
}
公共类设备注册插件扩展插件{
公共静态最终字符串TAG=“DeviceRegistrationPlugin”;
公共静态最终字符串操作\u REGISTER\u DEVICE=“registerDeviceAction”;
保护字符串回调方法;
@凌驾
公共PluginResult执行(字符串操作、JSONArray参数、字符串回调ID){
字符串标记;
if(动作等于(动作寄存器设备)){
试一试{
令牌=args.getString(0);
if(令牌!=null){
//启动注册设备的任务
SharedReferences prefs=cordova.getActivity().getSharedReferences(WebServiceRequest.prefs\u标识,Context.MODE\u私有);
prefs.edit().putString(WebServiceRequest.PREF_TOKEN_参数,TOKEN.commit();
TaskRegisterDevice task=new TaskRegisterDevice(cordova.getActivity());//这是第36行
task.execute();
//告诉插件任务完成后将执行回调
//他已经完成了他的工作。
this.callBackMethod=callBackId;
PluginResult PluginResult=新的PluginResult(PluginResult.Status.NO_结果);
pluginResult.setKeepCallback(true);
返回pluginResult;
}
否则{
返回新的PluginResult(Status.ERROR,“需要令牌”);
}
}捕获(JSONException e){
//TODO自动生成的捕捉块
e、 printStackTrace();
返回新的PluginResult(PluginResult.Status.JSON_异常);
}
}
否则{
//发送到插件的操作无效
返回新的PluginResult(PluginResult.Status.INVALID_ACTION);
}
}
/**
*asynctask以注册设备
*@作者houcine
*
*/
类TaskRegisterDevice扩展了AsyncTask{
受保护的语境;
公共任务注册表设备(上下文){
this.context=上下文;
}
@凌驾
受保护的布尔doInBackground(Void…params){
试一试{
返回WebServiceRequest.RegisterDevice(上下文);
}捕获(JSONException e){
e、 printStackTrace();
返回true;
}捕获(IOE异常){
e、 printStackTrace();
返回true;
}
}
@凌驾
受保护的void onPostExecute(布尔结果){
//同步完成后返回新插件结果
Log.d(标签,“resultat DeviceRegistration:+result+”,\ncallBackMethod:+callBackMethod);
PluginResult PluginResult=新PluginResult(
PluginResult.Status.OK,结果);
pluginResult.setKeepCallback(false);
成功(pluginResult、callBackMethod);
}
}
}
文件:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.myapp.activity"
android:versionCode="1"
android:versionName="1.0.2" >
<supports-screens
android:largeScreens="true"
android:normalScreens="true"
android:smallScreens="true"
android:resizeable="true"
android:anyDensity="true"
/>
<uses-sdk android:minSdkVersion="5" android:targetSdkVersion="16"/>
//other stuff : declaration of <application> tag , activities , services...etc
>
01-01 06:54:26.251: E/AndroidRuntime(6189): FATAL EXCEPTION: Thread-31
01-01 06:54:26.251: E/AndroidRuntime(6189): java.lang.ExceptionInInitializerError
01-01 06:54:26.251: E/AndroidRuntime(6189): at com.myapp.plugins.DeviceRegistrationPlugin.execute(DeviceRegistrationPlugin.java:36)
01-01 06:54:26.251: E/AndroidRuntime(6189): at org.apache.cordova.api.PluginManager$1.run(PluginManager.java:192)
01-01 06:54:26.251: E/AndroidRuntime(6189): at java.lang.Thread.run(Thread.java:1096)
01-01 06:54:26.251: E/AndroidRuntime(6189): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.Handler.<init>(Handler.java:121)
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.AsyncTask.<clinit>(AsyncTask.java:152)
01-01 06:54:26.251: E/AndroidRuntime(6189): ... 3 more
//其他内容:标签声明、活动、服务等
>
和logCat:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.myapp.activity"
android:versionCode="1"
android:versionName="1.0.2" >
<supports-screens
android:largeScreens="true"
android:normalScreens="true"
android:smallScreens="true"
android:resizeable="true"
android:anyDensity="true"
/>
<uses-sdk android:minSdkVersion="5" android:targetSdkVersion="16"/>
//other stuff : declaration of <application> tag , activities , services...etc
>
01-01 06:54:26.251: E/AndroidRuntime(6189): FATAL EXCEPTION: Thread-31
01-01 06:54:26.251: E/AndroidRuntime(6189): java.lang.ExceptionInInitializerError
01-01 06:54:26.251: E/AndroidRuntime(6189): at com.myapp.plugins.DeviceRegistrationPlugin.execute(DeviceRegistrationPlugin.java:36)
01-01 06:54:26.251: E/AndroidRuntime(6189): at org.apache.cordova.api.PluginManager$1.run(PluginManager.java:192)
01-01 06:54:26.251: E/AndroidRuntime(6189): at java.lang.Thread.run(Thread.java:1096)
01-01 06:54:26.251: E/AndroidRuntime(6189): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.Handler.<init>(Handler.java:121)
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.AsyncTask.<clinit>(AsyncTask.java:152)
01-01 06:54:26.251: E/AndroidRuntime(6189): ... 3 more
01-01 06:54:26.251:E/AndroidRuntime(6189):致命异常:线程31
01-01 06:54:26.251:E/AndroidRuntime(6189):java.lang.ExceptionInInitializeError
01-01 06:54:26.251:E/AndroidRuntime(6189):在com.myapp.plugins.DeviceRegistrationPlugin.execute(DeviceRegistrationPlugin.java:36)
01-01 06:54:26.251:E/AndroidRuntime(6189):在org.apache.cordova.api.PluginManager$1.run(PluginManager.java:192)
01-01 06:54:26.251:E/AndroidRuntime(6189):在java.lang.Thread.run(Thread.java:1096)处
01-01 06:54:26.251:E/AndroidRuntime(6189):原因:java.lang.RuntimeException:无法在未调用Looper.prepare()的线程内创建处理程序
01-01 06:54:26.251:E/AndroidRuntime(6189):在android.os.Handler.(Handler.java:121)
01-01 06:54:26.251:E/AndroidRuntime(6189):位于android.os.AsyncTask$InternalHandler。(AsyncTask.java:421)
01-01 06:54:26.251:E/AndroidRuntime(6189):位于android.os.AsyncTask$InternalHandler。(AsyncTask.java:421)
01-01 06:54:26.251:E/AndroidRuntime(6189):在android.os.AsyncTask.(AsyncTask.java:152)
01-01 06:54:26.251:E/AndroidRuntime(6189):。。。3个以上
注意:该应用程序在HTC ONE S、HTC ONE X、三星GALAXY S II、三星GALAXY SIII上运行良好,android sdk版本为4.0或更高版本,但不适用于android版本的设备,如:2.2.2、2.3.5、2.3.3异步任务应在UI线程上创建和执行。看起来像是在主线程之外调用了DeviceRegistrationPlugin.execute()
方法,这就是为什么会出现错误
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.myapp.activity"
android:versionCode="1"
android:versionName="1.0.2" >
<supports-screens
android:largeScreens="true"
android:normalScreens="true"
android:smallScreens="true"
android:resizeable="true"
android:anyDensity="true"
/>
<uses-sdk android:minSdkVersion="5" android:targetSdkVersion="16"/>
//other stuff : declaration of <application> tag , activities , services...etc
>
01-01 06:54:26.251: E/AndroidRuntime(6189): FATAL EXCEPTION: Thread-31
01-01 06:54:26.251: E/AndroidRuntime(6189): java.lang.ExceptionInInitializerError
01-01 06:54:26.251: E/AndroidRuntime(6189): at com.myapp.plugins.DeviceRegistrationPlugin.execute(DeviceRegistrationPlugin.java:36)
01-01 06:54:26.251: E/AndroidRuntime(6189): at org.apache.cordova.api.PluginManager$1.run(PluginManager.java:192)
01-01 06:54:26.251: E/AndroidRuntime(6189): at java.lang.Thread.run(Thread.java:1096)
01-01 06:54:26.251: E/AndroidRuntime(6189): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.Handler.<init>(Handler.java:121)
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:421)
01-01 06:54:26.251: E/AndroidRuntime(6189): at android.os.AsyncTask.<clinit>(AsyncTask.java:152)
01-01 06:54:26.251: E/AndroidRuntime(6189): ... 3 more
您可以尝试通过以下方式进行修复:
cordova.getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
TaskRegisterDevice task = new TaskRegisterDevice(cordova.getActivity());
task.execute();
}
});
感谢您的回复,但是如何解释代码在android 4.0或更高版本上运行100%良好,而对于android 2.3.3、2.2.2、2.3.5、2.3.6则不是这样?根据AsyncTask
documentation必须在UI线程上加载AsyncTask类。这是从JELLY_BEAN开始自动完成的
。我想这就是解释。我知道,但我已经在ICS上测试过了,它也能工作。好的,我将对逻辑进行一些更改,并强制它在UIThread上运行,以避免此问题。谢谢:)