获取系统当前内存

//获得系统可用内存

private String getSystemAvaialbeMemorySize(){

ActivityManager mActivityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);

MemoryInfo memoryInfo = new MemoryInfo();  

mActivityManager.getMemoryInfo(memoryInfo);

long memSize = memoryInfo.availMem;

String availMemStr = Formatter.formatFileSize(CursorTest.this ,memSize);

 return availMemStr;

}

private boolean isEnoughMem() {

File path = Environment.getDataDirectory(); // Get the path /data, this is internal storage path.

StatFs stat = new StatFs(path.getPath());

long blockSize = stat.getBlockSize();

long availableBlocks = stat.getAvailableBlocks(); // free size, unit is byte.

 if (memSize < 1024*1024) {//If phone available memory is less than 1M ,return

  return false;
    }
    return true;

}