Question

我使用Timer重复请求。一段时间后我得到OutOfMemoryError。我扩展Application类以获得单个实例。但我仍然得到错误和应用程序崩溃。清除缓存后它再次起作用。

我每隔几秒就以编程方式清除缓存，但是当我这样做时，我得到NegativeArraySizeException。我做的单个实例的事情是错的。

   public ArrayList getCo_ordinates(String deviceId) {
        String URL_CO_ORDINATES = "http://192.168.1.42:8080/image/getDevicePosition?deviceId=" + deviceId;
            myApplication.getRequestQueue().start();

        final JsonArrayRequest request = new JsonArrayRequest(URL_CO_ORDINATES, new Response.Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray response) {

                try {

                    for (int i = 0; i < response.length(); i++) {

                        X = response.getJSONObject(i).getString("xCoordinate");
                        Y = response.getJSONObject(i).getString("yCoodinate");
                        System.out.println("xCoordinate" + X);
                        System.out.println("yCoodinate" + Y);
                    if(isCoordinateDifferent()) {
                        addTap(Integer.parseInt(X), Integer.parseInt(Y));
                    }else {
                    }
                    updateNewCoordinates(Integer.parseInt(X),Integer.parseInt(Y));
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                    Toast.makeText(context, "" + e, Toast.LENGTH_SHORT).show();
                }

            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                Toast.makeText(getApplicationContext(), "Could Not connect to server", Toast.LENGTH_LONG).show();

            }
        })
        {
            @Override
            protected Map<String, String> getParams() {
                Map<String, String> params = new HashMap<String, String>();
                String deviceID = Build.SERIAL;
                params.put("Content-Type", "application/json; charset=utf-8");

                return params;
            }
        };
        myApplication.addToRequestQueue(request);
    return null;
}

应用程序类：

public class MyApplication extends Application {
private int cacheClearCount=0;
private static MyApplication myApplication;
private int installCount = 0;
private RequestQueue requestQueue;
@Override
public void onCreate() {
    super.onCreate();
    myApplication = this;
    requestQueue = Volley.newRequestQueue(getApplicationContext());
}

public MyApplication(){

}

public int getCacheClearCount() {
    return cacheClearCount;

}

public RequestQueue getRequestQueue() {
    return requestQueue;
}

public <T> void addToRequestQueue(Request<T> request, String tag) {
    getRequestQueue().add(request);
}

public <T> void addToRequestQueue(Request<T> request) {
    getRequestQueue().add(request);
}

public void cancelPendingRequest(Object tag) {
    getRequestQueue().cancelAll(tag);
}

public void setCacheClearCount(int cacheClearCount) {
    this.cacheClearCount = cacheClearCount;
}

public static MyApplication getInstance() {
    return myApplication;
}

Answer 1

也许是因为你反复创建新的String。请改用StringBuffer。

即使在使用单个实例后，也会出现Volley OutOfMemoryError

1 个答案: