Android 如何使用 Environment.getExternalStorageDirectory()

Question

如何使用 Environment.getExternalStorageDirectory() 从 SD 卡读取存储的图像，或者有更好的方法吗？

Answer 1

Environment.getExternalStorageDirectory().getAbsolutePath()

为您提供 SDCard 的完整路径。然后，您可以使用标准 Java 执行正常的文件 I/O 操作。

下面是一个写文件的简单例子:

String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
String fileName = "myFile.txt";

// Not sure if the / is on the path or not
File f = new File(baseDir + File.separator + fileName);
f.write(...);
f.flush();
f.close();

编辑:

哎呀 - 你想要一个阅读的例子......

String baseDir = Environment.getExternalStorageDirectory().getAbsolutePath();
String fileName = "myFile.txt";

// Not sure if the / is on the path or not
File f = new File(baseDir + File.Separator + fileName);
FileInputStream fiStream = new FileInputStream(f);

byte[] bytes;

// You might not get the whole file, lookup File I/O examples for Java
fiStream.read(bytes); 
fiStream.close();