android（8）（获取手机系统内存和SD卡内存信息）

获取手机内存和SD卡内存信息：public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        TextView tvMemoryInfo = (TextView) findViewById(R.id.tv_memory_info);        // 获得sd卡的内存状态        File sdcardFileDir = Environment.getExternalStorageDirectory();//获取SD卡的路径文件对象        String sdcardMemory = getMemoryInfo(sdcardFileDir);        // 获得手机内部存储控件的状态        File dataFileDir = Environment.getDataDirectory();//获得手机内存的路径文件对象        String dataMemory = getMemoryInfo(dataFileDir);        tvMemoryInfo.setText("SD卡: " + sdcardMemory + "\n手机内部: " + dataMemory);    }    /** * 根据路径获取内存状态 * @param path * @return */    private String getMemoryInfo(File path) {        // 根据文件对象的路径获得一个磁盘状态对象        StatFs stat = new StatFs(path.getPath());        long blockSize = stat.getBlockSize();   // 获得一个扇区的大小        long totalBlocks = stat.getBlockCount();    // 获得扇区的总数        long availableBlocks = stat.getAvailableBlocks();   // 获得可用的扇区数量        // 总空间        String totalMemory =  Formatter.formatFileSize(this, totalBlocks * blockSize);        // 可用空间        String availableMemory = Formatter.formatFileSize(this, availableBlocks * blockSize);        return "总空间: " + totalMemory + "\n可用空间: " + availableMemory;    }
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