文件读写

0.读写权限xml文件里

<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

1.获得sd卡路径

http://www.eoeandroid.com/thread-169876-1-1.html //sd卡操作

getAbsolutePath、getPath获得的路径一样

File file = Environment.getExternalStorageDirectory();

String sdPath = file.getAbsolutePath();

String filePath = file.getPath() + "/notes";

2.判断assets下的某个文件是否存在

private Context mContext = (Context) MediaActivity.sMediaActivity;

AssetManager am = this.mContext.getAssets(); //或this=Activitythis.getAssets()

try {

am.open("test/mp41.mp4");

} catch (IOException e) { //文件不存在

System.out.println(" not exits ");

e.printStackTrace();

}

3.判断某个路径下的文件是否存在

File fileM=new File(picPath);

if(!fileM.exists())

System.out.println(" not exits ");

4.资源拷贝到sd卡里

成功

adb push testmp3.mp3 sdcard/testmp3.mp3

此时当前目录在testmp3.mp3文件夹

出错

failed to copy '/Users/admin/Downloads/abc.png' to 'sdcard/abc.png': Read-only file system

sdcard.img文件路径有错或此文件已经存在

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