动态从drawable中获取图像

Question

我正在开发条码阅读器应用程序，我想在读取条码时显示产品图像，所以我用产品条码编号重命名照片并将 drawables 文件夹。照片名称为ex 1234567，尝试使用barcodeNo检索。但是我在barcodeNo上遇到错误。我该怎么做？

ImageView iv = (ImageView) findViewById(R.id.imageView1);   
iv.setImageResource(R.drawable.barcodeNo);

Answer 1

只需在 getImage 方法中传递您的代码，即可从可绘制文件夹中找到您的图像。

iv.setImageResource(getImage(barcodeNo));

public int getImage(String imageName) {

     int drawableResourceId = this.getResources().getIdentifier(imageName, "drawable", this.getPackageName());

     return drawableResourceId;
}

Answer 2

String uri = "@drawable/myresource";  // where myresource (without the extension) is the file

int imageResource = getResources().getIdentifier(uri, null, getPackageName());

imageview= (ImageView)findViewById(R.id.imageView);
Drawable res = getResources().getDrawable(imageResource);
imageView.setImageDrawable(res);
OR
imageview.setImageResource(imageResource)

Answer 3

@Narendra Sorathiya 的回答是正确的。您已编写此代码来解决您在屏幕截图上发布的NullPointerException：

ImageView iv = (ImageView) findViewById(R.id.imageView1);
iv.setImageResource(getImage(barcodeNo));
.
.
.
.
public int getImage(String imageName) {

     int drawableResourceId = this.getResources().getIdentifier(imageName, "drawable", this.getPackageName());

     return drawableResourceId;
}