public boolean externalMemoryAvailable(){
return android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED);
}
public long getAvailableExternalMemorySize(){
if(externalMemoryAvailable()){
File path = Environment.getExternalStorageDirectory();
StatFs stat = new StatFs(path.getPath());
long blockSize = stat.getBlockSize();
long availableBlocks = stat.getAvailableBlocks();
return availableBlocks*blockSize/(1024*1024);//返回单位 M
}
else{
return -1;
}
}
