Android_获取sd卡空间、手机内部存储空间

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在开发中，我们难免会跟手机外部存储或者内部存储打交道，当下载一个文件时，不可避免的就要先判断存储空间是否足够用来下载文件，这时我们就要获取存储空间的情况，代码如下:

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

TextView tvMemoryInfo = (TextView) this.findViewById(R.id.tv_memoryInfo);
tvMemoryInfo.setText("sd卡总空间:"+this.getTotalSDSize()+"\nsd卡可用空间:"+this.getAvailSDSize()+"\n手机rom总空间:"+this.getTotalRomSize()+"\n手机rom可用空间:"+this.getAvailRomSize());
}

/**
* 获取sd卡的总空间
*/
private String getTotalSDSize(){
StatFs stat = getStatFs(0);
long totalBlocks = stat.getBlockCount();
long blockSize = stat.getBlockSize();
long totalSDSize = totalBlocks * blockSize;
return Formatter.formatFileSize(this, totalSDSize);
}

/**
* 获取sd卡的可用空间
*/
private String getAvailSDSize(){
StatFs stat = getStatFs(0);
long availBlocks = stat.getAvailableBlocks();
long blockSize = stat.getBlockSize();
long availSDSize = availBlocks * blockSize;
return Formatter.formatFileSize(this, availSDSize);
}

//mode 0:获取的是sd的状态 	1:获取的是手机内部存储rom的状态
private StatFs getStatFs(int mode) {
File path = null;

switch(mode){
case 0 :
path = Environment.getExternalStorageDirectory();
break;
case 1 :
path = Environment.getDataDirectory();
break;
}

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

/**
* 获取手机内部存储rom的总空间
*/
private String getTotalRomSize(){
StatFs stat = getStatFs(1);
long totalBlocks = stat.getBlockCount();
long blockSize = stat.getBlockSize();
long totalSDSize = totalBlocks * blockSize;
return Formatter.formatFileSize(this, totalSDSize);
}

/**
*  获取手机内部存储rom的可用空间
*/
private String getAvailRomSize(){
StatFs stat = getStatFs(1);
long availBlocks = stat.getAvailableBlocks();
long blockSize = stat.getBlockSize();
long availSDSize = availBlocks * blockSize;
return Formatter.formatFileSize(this, availSDSize);
}