Android java runnable runTimeException
Android java runnable runTimeException
我在尝试使用Android Java中Runnable Thread的等效setTimeout()时遇到了一些问题。所以基本上我有一个名为pathGeometrys的Array，它存储从API返回的数据：
public void getDirection(Event eventModel, final Context context) {
String eventX = eventModel.getEventX();
String eventY = eventModel.getEventY();
final ArrayList<Geometry> pathGeometries = new ArrayList<Geometry>();
try {
HttpClient client = new DefaultHttpClient();
HttpGet request = new HttpGet(
"http://www.onemap.sg/API/services.svc/route/solve?token=qo/s2TnSUmfLz+32CvLC4RMVkzEFYjxqyti1KhByvEacEdMWBpCuSSQ+IFRT84QjGPBCuz/cBom8PfSm3GjEsGc8PkdEEOEr&routeStops=29741.9,40039.6;"
+ eventX + "," + eventY + "&routemode=CYCLE");
HttpResponse response = client.execute(request);
HttpEntity entity = response.getEntity();
//Code to extract and store to pathGeometries
} catch (JSONException e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
for (int iii = 0; iii < pathGeometries.size(); iii++) {
final int counter = iii;
final Handler h = new Handler();
h.postDelayed(new Runnable()
{
private long time = 0;
public void run()
{
time += 1000;
Log.d("TimerExample", "Going for... " + time);
h.postDelayed(this, 1000);
moveNext(pathGeometries.get(counter).getX(),
pathGeometries.get(counter).getY(), 0, context);
}
}, 1000);
}
}
在 for 循环中，我循环 pathGeometries 中的每个点，通过调用 moveNext() 将该点设置为地图的中心，并在移动到下一条记录之前将其postDelayed 1 毫秒。
public static void moveNext(double coordx, double coordy, int k, Context context){
Point p = new Point(coordx, coordy);
EventMain.mMapView.zoomToResolution(p, 1);}
但是，我收到这样的错误消息：
01-17 16:30:41.547: E/AndroidRuntime(32490): FATAL EXCEPTION: AsyncTask #5
01-17 16:30:41.547: E/AndroidRuntime(32490): java.lang.RuntimeException: An error occured while executing doInBackground()
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.os.AsyncTask$3.done(AsyncTask.java:278)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.lang.Thread.run(Thread.java:856)
01-17 16:30:41.547: E/AndroidRuntime(32490): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.os.Handler.<init>(Handler.java:121)
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.app.Activity.<init>(Activity.java:735)
01-17 16:30:41.547: E/AndroidRuntime(32490): at nyp.edu.eneighbourhood.directionRunnable.<init>(directionRunnable.java:15)
01-17 16:30:41.547: E/AndroidRuntime(32490): at Controller.EventController.getDirection(EventController.java:301)
01-17 16:30:41.547: E/AndroidRuntime(32490): at AsyncTask.GetEventDirectionAsyncTask.doInBackground(GetEventDirectionAsyncTask.java:34)
01-17 16:30:41.547: E/AndroidRuntime(32490): at AsyncTask.GetEventDirectionAsyncTask.doInBackground(GetEventDirectionAsyncTask.java:1)
01-17 16:30:41.547: E/AndroidRuntime(32490): at android.os.AsyncTask$2.call(AsyncTask.java:264)
01-17 16:30:41.547: E/AndroidRuntime(32490): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
01-17 16:30:41.547: E/AndroidRuntime(32490): ... 5 more
有什么想法可以解决这个问题吗？因为我不确定我做得是否正确。提前谢谢。
编辑在我的 UI Thread中：
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final Handler handler = new Handler();
}
btnGetDirection.setOnClickListener(new OnClickListener() {
String direction = "";
int counter = 1;
ArrayList<String> directionList = new ArrayList<String>();
public void onClick(View v) {
eventModel.setEventX(String.valueOf(eventModel.getEventX()));
eventModel.setEventY(String.valueOf(eventModel.getEventY()));
new GetEventDirectionAsyncTask(
new GetEventDirectionAsyncTask.OnRoutineFinished() {
public void onFinish() {
// Hide the callout and plot user location
// marker
// close the progress dialog
progressDialog.dismiss();
}
}, handler).execute(eventModel);
}
});
在 GetEventDirectionAsyncTask 类中：
public class GetEventDirectionAsyncTask extends AsyncTask<Event, Integer, Double> {
EventController eventCtrl = new EventController();
public static ArrayList<String> directionList = new ArrayList<String>();
Context context;
Handler handler;
public interface OnRoutineFinished { // interface
void onFinish();
}
private OnRoutineFinished mCallbacks;
public GetEventDirectionAsyncTask(OnRoutineFinished callback, Handler handler) { // constructor with
// interface
mCallbacks = callback;
this.handler = handler;
}
public GetEventDirectionAsyncTask() {
} // empty constructor to maintain compatibility
@Override
protected Double doInBackground(Event... params) {
if (params.length == 1) {
eventCtrl.getDirection(params[0], context);
directionList = eventCtrl.getDirectionPath(params[0], context);
}
return null;
}
protected void onPostExecute(Double result) {
if (mCallbacks != null)
mCallbacks.onFinish(); // call interface on finish
}
protected void onProgressUpdate(Integer... progress) {
}
}
在我的控制器类 getDirection 方法中：
for (int iii = 0; iii < pathGeometries.size(); iii++) {
final int counter = iii;
final Handler h = new Handler();
h.postDelayed(new Runnable()
{
private long time = 0;
public void run()
{
time += 1000;
Log.d("TimerExample", "Going for... " + time);
h.postDelayed(this, 1000);
moveNext(pathGeometries.get(counter).getX(),
pathGeometries.get(counter).getY(), 0, context);
}
}, 1000);
运行时异常：无法在线程中创建没有...
因为您尝试从 doInBackground Thread 而不是 UI Thread 调用moveNext
要修复以下错误：
第一个选项：在 Activity 中在类级别声明Handler h，并在onCreate方法或 UI 线程上运行的任何方法中对其进行初始化，例如onPreExecute()
`Handler handle;
public GetEventDirectionAsyncTask(OnRoutineFinished callback,
Handler handle){
this.handle=handle;
...
}`
将 Hanlder 从 Activity 传递为：
final Hanlder hanlder=new Hanlder();
btnGetDirection.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
GetEventDirectionAsyncTask obj= new GetEventDirectionAsyncTask(
new GetEventDirectionAsyncTask.OnRoutineFinished() {
public void onFinish() {
...
}
},hanlder).execute(eventModel);
}
});
现在使用handle从doInBackground呼叫postDelayed
第二个选项：使用 runOnUiThread 从 UI 线程创建和调用处理程序：
YourActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
create and call postDelayed method from Handler here
}
});
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