如何在 ImageView 中显示 TextView 的值？

Question

我想让我的用户在 TextView 中输入一个词，然后在 ImageView 中显示相应的图片。例如，用户可能输入 "Moon"，然后我会显示 moon.png.

我怎样才能做到这一点？

Answer 1

Resources class 有一个方法 getIdentifier() 可以在这里使用。

int getIdentifier(String name, String defType, String defPackage)

Return a resource identifier for the given resource name. A fully qualified resource name is of the form "package:type/entry". The first two components (package and type) are optional if defType and defPackage, respectively, are specified here.

Note: use of this function is discouraged. It is much more efficient to retrieve resources by identifier than by name.

这意味着你可以写：

String userEntered = myEditText.getText().toString();
int id = getResources().getIdentifier(userEntered, "drawable", getPackageName());
myImageView.setImageResource(id);

Answer 2

// Find TextView and ImageView, if required
TextView myTextView = (TextView) findViewById(R.id.tv);
ImageView myImageView = (ImageView) findViewById(R.id.iv);

// Get text from TextView
String myText = textView.getText().toString();

// Get ID of drawable with name entered by user
Context context = myImageView.getContext();
int id = context.getResources().getIdentifier(myText, "drawable", context.getPackageName());

// Set that drawable as the image to be displayed in the ImageView
myImageView.setImageResource(id);