Attempt to fix selector memeory leak. Add update checker

app/src/main/java/com/stardust/scriptdroid/tool/UpdateChecker.java

@@ -0,0 +1,150 @@
+package com.stardust.scriptdroid.tool;
+
+import android.content.Context;
+import android.text.TextUtils;
+import android.util.Log;
+
+import com.android.volley.DefaultRetryPolicy;
+import com.android.volley.Request;
+import com.android.volley.RequestQueue;
+import com.android.volley.Response;
+import com.android.volley.VolleyError;
+import com.android.volley.toolbox.StringRequest;
+import com.android.volley.toolbox.Volley;
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+import com.stardust.pio.UncheckedIOException;
+
+import java.lang.reflect.Type;
+import java.util.List;
+
+/**
+ * Created by Stardust on 2017/4/9.
+ */
+
+public class UpdateChecker implements Response.Listener<String>, Response.ErrorListener {
+
+    private static final String LOG_TAG = UpdateChecker.class.getName();
+    private RequestQueue mRequestQueue;
+    private static final String UPDATE_URL = "https://raw.githubusercontent.com/hyb1996/NoRootScriptDroid/master/version.json";
+
+
+    public interface Callback {
+
+        void onSuccess(CheckResult result);
+
+        void onError(Exception exception);
+
+    }
+
+    private Callback mCallback;
+    private final int mTimeOut = 3000;
+
+    public UpdateChecker(Context context, Callback callback) {
+        mCallback = callback;
+        mRequestQueue = Volley.newRequestQueue(context);
+    }
+
+    private CheckResult parse(String json) {
+        Gson gson = new Gson();
+        Type type = new TypeToken<CheckResult>() {
+        }.getType();
+        CheckResult result = gson.fromJson(json, type);
+        Log.i(LOG_TAG, result.toString());
+        return result;
+    }
+
+
+    public void check() {
+        StringRequest request = new StringRequest(Request.Method.GET, UPDATE_URL, this, this);
+        request.setRetryPolicy(new DefaultRetryPolicy(mTimeOut, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
+        request.setTag("update-check");
+        mRequestQueue.add(request);
+    }
+
+    @Override
+    public void onErrorResponse(VolleyError error) {
+        error.printStackTrace();
+        mCallback.onError(error);
+    }
+
+    @Override
+    public void onResponse(String response) {
+        try {
+            CheckResult result = parse(response);
+            if (result.isValid()) {
+                mCallback.onSuccess(result);
+            } else {
+                mCallback.onError(new UpdateDataInvalidException());
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+            mCallback.onError(e);
+        }
+    }
+
+    public void cancel() {
+        mRequestQueue.cancelAll("update-check");
+    }
+
+    public static class CheckResult {
+
+        public int versionCode;
+        public String releaseNotes;
+        public String versionName;
+        public List<Download> downloads;
+        public List<OldVersion> oldVersions;
+        public int deprecated;
+
+        public boolean isValid() {
+            return downloads != null && !downloads.isEmpty() && versionCode > 0
+                    && !TextUtils.isEmpty(versionName) && !TextUtils.isEmpty(releaseNotes);
+        }
+
+        @Override
+        public String toString() {
+            return "CheckResult{" +
+                    "versionCode=" + versionCode +
+                    ", releaseNotes='" + releaseNotes + '\'' +
+                    ", versionName='" + versionName + '\'' +
+                    ", downloads=" + downloads +
+                    ", oldVersions=" + oldVersions +
+                    ", deprecated=" + deprecated +
+                    '}';
+        }
+
+
+    }
+
+    public static class OldVersion {
+
+        public int versionCode;
+        public String issues;
+
+        @Override
+        public String toString() {
+            return "OldVersion{" +
+                    "versionCode=" + versionCode +
+                    ", issues='" + issues + '\'' +
+                    '}';
+        }
+    }
+
+    public static class Download {
+
+        public String name;
+        public String url;
+
+        @Override
+        public String toString() {
+            return "Download{" +
+                    "name='" + name + '\'' +
+                    ", url='" + url + '\'' +
+                    '}';
+        }
+    }
+
+    public static class UpdateDataInvalidException extends RuntimeException {
+
+    }
+}