无法读取文件openFileInput Android

Question

尝试打开文件 文件存在（并且检查返回true）  但是in.available返回0

如果我用设备监视器查看文件，我可以看到该文件，并且它有一个大小...

if(fileExists(filePath) == false)
                return "ERROR";
            FileInputStream in = openFileInput(filePath);
            if(in.available() <= 0)
            {
                //THIS ALWAYS HAPPENS!!!
            }
            InputStreamReader inputStreamReader = new InputStreamReader(in);
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = bufferedReader.readLine()) != null) {
                sb.append(line);
            }
            inputStreamReader.close();

权限设置

 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.VIBRATE" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WAKE_LOCK" />
    <uses-permission android:name="android.permission.READ_LOGS" />

Answer 1

openFileInput有什么作用？ 应该这样做：

FileInputStream in = new FileInputStream(new File(filePath));