android - How can I convert String to Drawable

Question

I have many icon in drawable folder and I have their name as String. How can I access to drawable folder and change background imageView (or any view) use these name in dynamically. Thanks

Answer 1

这可以使用反射来完成：

String name = "your_drawable";
final Field field = R.drawable.getField(name);
int id = field.getInt(null);
Drawable drawable = getResources().getDrawable(id);

或使用Resources.getIdentifier()：

String name = "your_drawable";
int id = getResources().getIdentifier(name, "drawable", getPackageName());
Drawable drawable = getResources().getDrawable(id);

然后在任何一种情况下使用它来设置drawable：

view.setBackground(drawable)

Answer 2

int resId = getResources().getIdentifier("your_drawable_name","drawable",YourActivity.this.getPackageName());
Drawable d = YourActivity.this.getResources().getDrawable(resId);

Answer 3

可以这样做：

ImageView imageView = new ImageView(this);
imageView.setBackground(getResources().getDrawable(getResources().getIdentifier("name","id",getPackageName())));

Answer 4

尝试这个：

public Bitmap getPic (int number)
{
    return
        BitmapFactory.decodeResource
        (
            getResources(), getResourceID("myImage_" + number, "drawable", getApplicationContext())
        );
}

protected final static int getResourceID
(final String resName, final String resType, final Context ctx)
{
    final int ResourceID =
        ctx.getResources().getIdentifier(resName, resType,
            ctx.getApplicationInfo().packageName);
    if (ResourceID == 0)
    {
        throw new IllegalArgumentException
        (
            "No resource string found with name " + resName
        );
    }
    else
    {
        return ResourceID;
    }
}

Answer 5

如果您将文件名作为字符串，您可以使用：

int id = getResources().getIdentifier("name_of_resource", "id", getPackageName());

使用此 ID，您可以像往常一样访问它（假设它是可绘制的）：

Drawable drawable = getResources().getDrawable(id);

Answer 6

如果不在任何活动中，则使用@FD_ 示例

笔记：

如果您没有进行任何活动，则必须发送上下文参数才能使用“getResources()”或“getPackageName()”，并且不推荐使用“getDrawable(id)”，请改用 getDrawer(int id, Theme theme)。（主题可以为空）：

String name = "your_drawable";
int id = context.getResources().getIdentifier(name, "drawable", 
context.getPackageName());
Drawable drawable = context.getResources().getDrawable(id, null);