Android开发之通过ImageView名称从文件夹拿到ImageView的Drawable对象的方法

代码如下：

先看从Drawable文件夹中取出ImageView的Drawable对象

package com.reapal.mobile.agreepayment.utils;

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

/**
 * @author ：下一页5（轻飞扬）
 *         创建时间：2018/6/28.15:28
 *         根据对应的银行名称所在drawable目录拿到对应的银行图标
 */
public class GetBankIconUtils {
    /**
     * 获取银行图标
     */
    public static Drawable getResBankDrawable(Context context, String bankNameString) {
        //图片的名称不包含后缀
        String bankName = "unknown";
        try {
            if (bankNameString != null) {
                switch (bankNameString) {
                    case "?":
                        bankName = "unknown";
                        break;
                    case "北京银行":
                        bankName = "bank_bj";
                        break;
                    case "光大银行":
                        bankName = "bank_gd";
                        break;
                    case "广发银行":
                        bankName = "bank_gf";
                        break;
                    case "工商银行":
                        bankName = "bank_gs";
                        break;
                    case "华夏银行":
                        bankName = "bank_hx";
                        break;
                    case "建设银行":
                        bankName = "bank_js";
                        break;
                    case "交通银行":
                        bankName = "bank_jt";
                        break;
                    case "民生银行":
                        bankName = "bank_ms";
                        break;
                    case "农业银行":
                        bankName = "bank_ny";
                        break;
                    case "平安银行":
                        bankName = "bank_pa";
                        break;
                    case "浦发银行":
                        bankName = "bank_pf";
                        break;
                    case "上海银行":
                        bankName = "bank_sh";
                        break;
                    case "兴业银行":
                        bankName = "bank_xy";
                        break;
                    case "邮政储蓄":
                        bankName = "bank_yz";
                        break;
                    case "中国银行":
                        bankName = "bank_zg";
                        break;
                    case "招商银行":
                        bankName = "bank_zs";
                        break;
                    case "中信银行":
                        bankName = "bank_zx";
                        break;
                    default:
                        break;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        //bankName图片的名称不包含后缀，drawable返回图片的类型，context.getPackageName()拿到项目的包名
        int resID = context.getResources().getIdentifier(bankName, "drawable", context.getPackageName());
        Drawable drawable = context.getResources().getDrawable(resID);
        return drawable;
    }
}

2.再看从access资源文件夹中取出ImageView的Drawable对象：

   /**
     * 获取银行图标
     */
    public static Drawable getResBankDrawable(Context context, String bank_name) {
        InputStream is = null;
        String res_name = "unknown.png";//带后缀的图片的全名称
        try {
            if (bank_name != null) {
                switch (bank_name) {
                    case "?":
                        res_name = "unknown.png";
                        break;
                    case "北京银行":
                        res_name = "bank_bj.png";
                        break;
                    case "光大银行":
                        res_name = "bank_gd.png";
                        break;
                    case "广发银行":
                        res_name = "bank_gf.png";
                        break;
                    case "工商银行":
                        res_name = "bank_gs.png";
                        break;
                    case "华夏银行":
                        res_name = "bank_hx.png";
                        break;
                    case "建设银行":
                        res_name = "bank_js.png";
                        break;
                    case "交通银行":
                        res_name = "bank_jt.png";
                        break;
                    case "民生银行":
                        res_name = "bank_ms.png";
                        break;
                    case "农业银行":
                        res_name = "bank_ny.png";
                        break;
                    case "平安银行":
                        res_name = "bank_pa.png";
                        break;
                    case "浦发银行":
                        res_name = "bank_pf.png";
                        break;
                    case "上海银行":
                        res_name = "bank_sh.png";
                        break;
                    case "兴业银行":
                        res_name = "bank_xy.png";
                        break;
                    case "邮政储蓄":
                        res_name = "bank_yz.png";
                        break;
                    case "中国银行":
                        res_name = "bank_zg.png";
                        break;
                    case "招商银行":
                        res_name = "bank_zs.png";
                        break;
                    case "中信银行":
                        res_name = "bank_zx.png";
                        break;
                }
            }
            is = context.getAssets().open(res_name);
        } catch (IOException e) {
            e.printStackTrace();
        }
        Bitmap bitmap = BitmapFactory.decodeStream(is);
        Drawable drawable = new BitmapDrawable(bitmap);
        return drawable;
    }