android下载文件到内存安装出错

Intent intent = new Intent(); intent.setAction(android.content.Intent.ACTION_VIEW); intent.setDataAndType(Uri.fromFile(new file("file:///data/data/com.android.cab/files/TestApp1.apk")),"application/vnd.a‌​ndroid.package-archive"); startActivity(intent);
报了异常是
WARN/PackageParser(241): Skipping dir: /file:/data/data/com.android.cab/files/TestApp1.apk WARN/PackageInstaller(241): Parse error when parsing manifest. Discontinuing installation 

补充：移动开发 ,  Android