Memory Problems in device with Android 5.0.2

@Override protected void onDestroy() { RadaeePluginCallback.getInstance().willCloseReader(); final PDFViewController vctrl = m_controller; final Document doc = m_doc; final PDFLayoutView view = m_view; final PDFAssetStream astr = m_asset_stream; final PDFHttpStream hstr = m_http_stream; m_controller = null; m_doc = null; m_view = null; m_asset_stream = null; m_http_stream = null; if(view != null) view.PDFCloseOnUI(); new Thread(){ @Override public void run() { if (vctrl != null) vctrl.onDestroy(); if (view != null) view.PDFClose(); if (doc != null) doc.Close(); if (astr != null) astr.close(); if (hstr != null) hstr.close(); Global.RemoveTmp(); synchronized (PDFViewAct.this) { PDFViewAct.this.notify(); } } }.start(); synchronized (this) { try { wait(1500); } catch(Exception ignored) { } } super.onDestroy(); RadaeePluginCallback.getInstance().didCloseReader(); }