android automatically installs apk code instance of without the apk installer

/**
     *  The installation download is complete APK
     * @param savedFile
     */
    private void installAPK(File savedFile) {
        // Call the system installation method 
        Intent intent=new Intent();
        intent.setAction(intent.ACTION_VIEW);
        intent.setDataAndType(Uri.fromFile(savedFile), "application/vnd.android.package-archive");
        startActivity(intent);
        finish();
    }