AssetUtils.java

package xyz.yhsj.yhutils.io;

import java.io.IOException;
import java.io.InputStream;

import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.drawable.Drawable;

/**
 * Asset 工具类<br>
 */
@SuppressWarnings("deprecation")
public class AssetUtils {

    /**
     * 打开Asset下的文件
     *
     * @param fileName 文件名
     * @return
     */
    public static InputStream openAssetFile(Context context, String fileName) {
        AssetManager am = context.getAssets();
        InputStream is = null;
        try {
            is = am.open(fileName);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return is;
    }

    /**
     * 从assets 文件夹中读取文本数据
     */
    public static String getTextFromAssets(final Context context,
                                           String fileName) {
        String result = "";
        try {
            InputStream in = context.getResources().getAssets().open(fileName);
            // 获取文件的字节数
            int lenght = in.available();
            // 创建byte数组
            byte[] buffer = new byte[lenght];
            // 将文件中的数据读到byte数组中
            in.read(buffer);
            result = new String(buffer, "UTF-8");
            in.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 从assets 文件夹中读取图片
     */
    public static Drawable loadImageFromAsserts(final Context ctx,
                                                String fileName) {
        try {
            InputStream is = ctx.getResources().getAssets().open(fileName);
            return Drawable.createFromStream(is, null);
        } catch (IOException e) {
            if (e != null) {
                e.printStackTrace();
            }
        } catch (OutOfMemoryError e) {
            if (e != null) {
                e.printStackTrace();
            }
        } catch (Exception e) {
            if (e != null) {
                e.printStackTrace();
            }
        }
        return null;
    }

}