android.os.Environment#DIRECTORY_DCIM源码实例Demo

public void addCommonBookmarks() {
    String sd = Environment.getExternalStorageDirectory() + "/";

    String[] dirs = new String[] {
            sd + Environment.DIRECTORY_DCIM,
            sd + Environment.DIRECTORY_DOWNLOADS,
            sd + Environment.DIRECTORY_MOVIES,
            sd + Environment.DIRECTORY_MUSIC,
            sd + Environment.DIRECTORY_PICTURES
    };

    for (String dir : dirs) {

        addBookmark(new File(dir).getName(), dir);
    }
}
 

private String getDirectoryName(String name) {
    switch (name) {
        case "ALARMS":
            return Environment.DIRECTORY_ALARMS;
        case "DCIM":
            return Environment.DIRECTORY_DCIM;
        case "DOCUMENTS":
            return Environment.DIRECTORY_DOCUMENTS;
        case "DOWNLOADS":
            return Environment.DIRECTORY_DOWNLOADS;
        case "MOVIES":
            return Environment.DIRECTORY_MOVIES;
        case "MUSIC":
            return Environment.DIRECTORY_MUSIC;
        case "NOTIFICATIONS":
            return Environment.DIRECTORY_NOTIFICATIONS;
        case "PICTURES":
            return Environment.DIRECTORY_PICTURES;
        case "PODCASTS":
            return Environment.DIRECTORY_PODCASTS;
        case "RINGTONES":
            return Environment.DIRECTORY_RINGTONES;
        default:
            throw new IllegalArgumentException("Invalid directory representation: " + name);
    }
}
 

/**
 * 创建根缓存目录
 *
 * @return
 */
public static String getRootPath(Context context) {
    String rootPath = "";
    if (isSdCardAvailable()) {
        // 图片保存到相册
        rootPath = Environment.getExternalStorageDirectory().getAbsolutePath()
                + File.separator + Environment.DIRECTORY_DCIM + File.separator + "Camera";
        File file = new File(rootPath);
        if (!file.exists()) {
            file.mkdirs();
        }
    } else {
        // /data/data/<application package>/cache
        rootPath = context.getCacheDir().getPath();
    }
    return rootPath;
}
 

public static boolean isMediaDirectory(File file)
{
	try
	{
		String path = file.getCanonicalPath();
		for (String directory : new String[]{Environment.DIRECTORY_DCIM,
                   Environment.DIRECTORY_MUSIC,
				Environment.DIRECTORY_PICTURES})
		{
			if (path.startsWith(Environment.getExternalStoragePublicDirectory(directory)
					.getAbsolutePath()))
				return true;
		}
		return false;
	} catch (IOException e)
	{
		e.printStackTrace();
		return false;
	}
}
 

/**
     * 拍照
     */
    public static String capture(Activity activity, int requestCode) {
        Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        String picName = null;
        if (cameraIntent.resolveActivity(activity.getPackageManager()) != null) {
            if (BaseConfig.sSDCardExist) {
                picName = Environment.getExternalStorageDirectory().getAbsolutePath() +
                        File.separator + Environment.DIRECTORY_DCIM + File.separator +
                        "Camera" + File.separator + activity.getString(R.string.app_name) +
                        "_" + System.currentTimeMillis() + ".jpg";

            } else {
                picName = activity.getCacheDir().getPath() + File.separator +
                        activity.getString(R.string.app_name) + "_" + System.currentTimeMillis() + ".jpg";
            }
            File photoFile = new File(picName);
//            FileUtils.createFile(photoFile);

            Uri uri = FileProvider.getUriForFile(activity,
                    App.getInstance().getApplicationId() + ".provider", photoFile);

            List<ResolveInfo> resInfoList = activity.getPackageManager()
                    .queryIntentActivities(cameraIntent, PackageManager.MATCH_DEFAULT_ONLY);
            for (ResolveInfo resolveInfo : resInfoList) {
                String packageName = resolveInfo.activityInfo.packageName;
                activity.grantUriPermission(packageName, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION
                        | Intent.FLAG_GRANT_READ_URI_PERMISSION);
            }
            cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
            activity.startActivityForResult(cameraIntent, requestCode);
        } else {
            AppToast.showToast(R.string.open_camera_failure);
        }
        return picName;
    }
 

@Override
protected List<String> doInBackground(Void... params) {
    File dir = new File(Environment.getExternalStorageDirectory() + "/" + Environment.DIRECTORY_DCIM + "/Camera");
    if (dir.exists()) {
        List<String> data = new ArrayList<>();
        for (File f : dir.listFiles()) {
            if (f.isFile()) {
                data.add(f.getAbsolutePath());
            }
        }
        return data;
    }
    return null;
}
 

public static File getImageForGallery(long timeMillis) {
    String pictureName = getImageNameForGallery(timeMillis);
    File dcimFile = new File(Environment.getExternalStorageDirectory()
            + File.separator + Environment.DIRECTORY_DCIM, "Camera");
    if (!dcimFile.exists()) {
        dcimFile.mkdirs();
    }
    File file = new File(dcimFile, formatFileName(pictureName));
    return file;
}
 

public static File getMediaDir(String dirName) {
    File dcim = new File(Environment.getExternalStorageDirectory(), Environment.DIRECTORY_DCIM);
    File mediaDir = new File(dcim, dirName);
    if (!mediaDir.exists()) {
        mediaDir.mkdirs();
    }
    return mediaDir;
}
 

public static File getDcimFolder() {
    return new File("/sdcard/" + Environment.DIRECTORY_DCIM);
}