从drawable动态获取图像

Question

我正在开发一个条形码阅读器应用程序，我想在读取条形码时显示产品图像，所以我用产品条形码编号重命名了照片，并将其放入drawables文件夹。照片名称适用于ex 1234567，请尝试使用条形码编号检索。但我在条形码上出错了。我该怎么做？

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

Answer 1

@Narendra Sorathiya答案是对的。您编写了此代码来解决NullPointerException，您在屏幕截图上发布了该代码：

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;
}

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

只需在getImage方法中传递您的代码即可从可绘制文件夹中查找您的图像。

iv.setImageResource(getImage(barcodeNo));

public int getImage(String imageName) {

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

     return drawableResourceId;
}