代码都在这里了。

/**
 * 获取目录文件大小
 */
public static long getDirSize(File dir) {
    if (dir == null) {
        return 0;
    }
    if (!dir.isDirectory()) {
        return 0;
    }
    long dirSize = 0;
    File[] files = dir.listFiles();
    for (File file : files) {
        if (file.isFile()) {
            dirSize += file.length();
        } else if (file.isDirectory()) {
            dirSize += getDirSize(file); // 递归调用继续统计
        }
    }
    return dirSize;
}

 

public class Main7Activity extends AppCompatActivity {
    private TextView tv_main7_getdsize;
    String DATABASE_PATH = Environment
            .getExternalStorageDirectory()+"/AnemoMates";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main7);
        addPermissin1();
        tv_main7_getdsize=findViewById(R.id.tv_main7_getdsize);
        tv_main7_getdsize.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                long size= CacheUtils.getDirSize(new File(DATABASE_PATH));
                long filesize= 1;

                try {
                    filesize = CacheUtils.getFileSize(new File(DATABASE_PATH));
                } catch (IOException e) {
                    e.printStackTrace();
                }

                tv_main7_getdsize.setText(CacheUtils.formatFileSize(size)+""+CacheUtils.formatFileSize(filesize));

            }
        });
    }

    private void addPermissin1() {
        final int REQUEST_CODE_ACCESS_COARSE_LOCATION = 1;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//如果 API level 是大于等于 23(Android 6.0) 时
            //判断是否具有权限
            //危险权限需要动态申请
            if (ContextCompat.checkSelfPermission(this,
                    Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {

                //判断是否需要向用户解释为什么需要申请该权限
                if (ActivityCompat.shouldShowRequestPermissionRationale(this,
                        Manifest.permission.WRITE_EXTERNAL_STORAGE)) {

                }
                //请求权限
                ActivityCompat.requestPermissions(this,
                        new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
                        REQUEST_CODE_ACCESS_COARSE_LOCATION);
            }

            if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
                    != PackageManager.PERMISSION_GRANTED) {

                if (ActivityCompat.shouldShowRequestPermissionRationale(
                        this, Manifest.permission.ACCESS_COARSE_LOCATION)) {
                }

                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 1);
            }
        }
    }
}

 

 

权限：

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

还需要动态申请：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

//如果 API level 是大于等于 23(Android 6.0) 时 //判断是否具有权限
//危险权限需要动态申请

if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {

//判断是否需要向用户解释为什么需要申请该权限 if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) { } //请求权限 ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CODE_ACCESS_COARSE_LOCATION); }