正如标题所说,我想读入一个二进制文件,"mac_address_name",这是已经创建的.该项目是在连接到android studio IDE的物理设备上运行的。
这是我的项目树,你可以看到类和二进制文件。
下面是代码,在 处理器管理器 类,你可以在评论中看到我尝试的所有其他方法......
private String readFromFile() {
String ret = "";
try {
/*InputStream inputStream = main_activity.getApplicationContext().openFileInput("mac_address_name");*/
/*InputStream inputStream = new FileInputStream(new File("../mac_address_name"));*/
/*InputStream inputStream = main_activity.openFileInput("mac_address_name");*/
InputStream inputStream = new FileInputStream(new File("mac_address_name"));
if ( inputStream != null ) {
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String receiveString = "";
StringBuilder stringBuilder = new StringBuilder();
while ( (receiveString = bufferedReader.readLine()) != null ) {
stringBuilder.append("\n").append(receiveString);
}
inputStream.close();
ret = stringBuilder.toString();
}
}
catch (FileNotFoundException e) {
Log.e("login activity", "File not found: " + e.toString());
} catch (IOException e) {
Log.e("login activity", "Can not read file: " + e.toString());
}
return ret;
}
和输出。
Elogin活动。File not found: java.io.FileNotFoundException: mac_address_name: open failed: ENOENT (没有这样的文件或目录)
为了达到这个目的,你应该使用assets.Move该文件到你的项目中的srcmainassets文件夹,然后使用AssetsManager来获取文件内容。
AssetManager am = context.getAssets();
InputStream is = am.open("mac_address_name");
更多信息在。https:/nbasercode.comnetandroid-read-text-file-from-assets-folder-in-android-studio。https:/developer.android.comreferenceandroidcontentresAssetManager。