android 工具类篇 ResourceUtils

最新推荐文章于 2021-05-25 19:09:45 发布

转载最新推荐文章于 2021-05-25 19:09:45 发布 · 733 阅读

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本文介绍了一个用于Android应用中读取资源文件的工具类ResourceUtils。该工具类提供了从assets和raw目录中读取文件内容的方法，支持返回字符串或列表形式的数据。

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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import android.content.Context;

/**
 * ResourceUtils
 * 
 * @author <a href="http://www.trinea.cn" target="_blank">Trinea</a> 2012-5-26
 */
public class ResourceUtils {

    /**
     * get an asset using ACCESS_STREAMING mode. This provides access to files that have been bundled with an
     * application as assets -- that is, files placed in to the "assets" directory.
     * 
     * @param context
     * @param fileName The name of the asset to open. This name can be hierarchical.
     * @return
     */
    public static String geFileFromAssets(Context context, String fileName) {
        if (context == null || StringUtils.isEmpty(fileName)) {
            return null;
        }

        StringBuilder s = new StringBuilder("");
        try {
            InputStreamReader in = new InputStreamReader(context.getResources().getAssets().open(fileName));
            BufferedReader br = new BufferedReader(in);
            String line;
            while ((line = br.readLine()) != null) {
                s.append(line);
            }
            return s.toString();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * get content from a raw resource. This can only be used with resources whose value is the name of an asset files
     * -- that is, it can be used to open drawable, sound, and raw resources; it will fail on string and color
     * resources.
     * 
     * @param context
     * @param resId The resource identifier to open, as generated by the appt tool.
     * @return
     */
    public static String geFileFromRaw(Context context, int resId) {
        if (context == null) {
            return null;
        }

        StringBuilder s = new StringBuilder();
        try {
            InputStreamReader in = new InputStreamReader(context.getResources().openRawResource(resId));
            BufferedReader br = new BufferedReader(in);
            String line;
            while ((line = br.readLine()) != null) {
                s.append(line);
            }
            return s.toString();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * same to {@link ResourceUtils#geFileFromAssets(Context, String)}, but return type is List<String>
     * 
     * @param context
     * @param fileName
     * @return
     */
    public static List<String> geFileToListFromAssets(Context context, String fileName) {
        if (context == null || StringUtils.isEmpty(fileName)) {
            return null;
        }

        List<String> fileContent = new ArrayList<String>();
        try {
            InputStreamReader in = new InputStreamReader(context.getResources().getAssets().open(fileName));
            BufferedReader br = new BufferedReader(in);
            String line;
            while ((line = br.readLine()) != null) {
                fileContent.add(line);
            }
            br.close();
            return fileContent;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * same to {@link ResourceUtils#geFileFromRaw(Context, int)}, but return type is List<String>
     * 
     * @param context
     * @param resId
     * @return
     */
    public static List<String> geFileToListFromRaw(Context context, int resId) {
        if (context == null) {
            return null;
        }

        List<String> fileContent = new ArrayList<String>();
        BufferedReader reader = null;
        try {
            InputStreamReader in = new InputStreamReader(context.getResources().openRawResource(resId));
            reader = new BufferedReader(in);
            String line = null;
            while ((line = reader.readLine()) != null) {
                fileContent.add(line);
            }
            reader.close();
            return fileContent;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}