bug fix.WXSQLiteOpenHelper mem leak (alibaba#1515)

* bug fix.WXSQLiteOpenHelper mem leak

* update test

* update test

* remove unused code

android/sdk/src/main/java/com/taobao/weex/appfram/storage/DefaultWXStorage.java

@@ -233,7 +233,7 @@ private void execute(Runnable runnable) {
     }
 
     public DefaultWXStorage(Context context) {
-        this.mDatabaseSupplier = WXSQLiteOpenHelper.getInstance(context);
+        this.mDatabaseSupplier = new WXSQLiteOpenHelper(context);
     }
 
 

android/sdk/src/main/java/com/taobao/weex/appfram/storage/WXSQLiteOpenHelper.java

@@ -224,8 +224,6 @@ public class WXSQLiteOpenHelper extends SQLiteOpenHelper {
     static SimpleDateFormat sDateFormatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.getDefault());
 
 
-    private static WXSQLiteOpenHelper sInstance;
-
     private Context mContext;
     private SQLiteDatabase mDb;
 
@@ -249,23 +247,12 @@ public class WXSQLiteOpenHelper extends SQLiteOpenHelper {
             + ")";
 
 
-    private WXSQLiteOpenHelper(Context context) {
+    public WXSQLiteOpenHelper(Context context) {
         super(context, DATABASE_NAME, null, DATABASE_VERSION);
         this.mContext = context;
     }
 
-    public static WXSQLiteOpenHelper getInstance(Context context) {
-        if (context == null) {
-            WXLogUtils.e(TAG_STORAGE,"can not get context instance...");
-            return null;
-        }
-        if (sInstance == null) {
-            sInstance = new WXSQLiteOpenHelper(context);
-        }
-        return sInstance;
-    }
-
-    SQLiteDatabase getDatabase() {
+    public SQLiteDatabase getDatabase() {
         ensureDatabase();
         return mDb;
     }

android/sdk/src/test/java/com/taobao/weex/appfram/storage/DefaultWXStorageTest.java

@@ -205,6 +205,7 @@
 package com.taobao.weex.appfram.storage;
 
 import com.taobao.weappplus_sdk.BuildConfig;
+
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
@@ -218,8 +219,10 @@
 import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
 
-import static org.powermock.api.mockito.PowerMockito.*;
-import static org.mockito.Mockito.*;
+import static org.mockito.Mockito.anyMapOf;
+import static org.mockito.Mockito.timeout;
+import static org.mockito.Mockito.verify;
+import static org.powermock.api.mockito.PowerMockito.mockStatic;
 
 /**
  * Created by sospartan on 7/28/16.
@@ -238,14 +241,15 @@ public class DefaultWXStorageTest {
   public PowerMockRule rule = new PowerMockRule();
 
   @Before
-  public void setup(){
+  public void setup() throws Exception{
     supplier = Mockito.mock(WXSQLiteOpenHelper.class);
     listener = Mockito.mock(IWXStorageAdapter.OnResultReceivedListener.class);
     storage = new DefaultWXStorage(RuntimeEnvironment.application);
 
     mockStatic(WXSQLiteOpenHelper.class);
-
-    PowerMockito.when(WXSQLiteOpenHelper.getInstance(RuntimeEnvironment.application)).thenReturn(supplier);
+    PowerMockito.whenNew(WXSQLiteOpenHelper.class)
+            .withArguments(RuntimeEnvironment.application)
+            .thenReturn(supplier);
   }