单击按钮后如何显示文本

Question

I want to appear a text (or button, whatever) after a button is clicked:

button5.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

- Now what? Create an intent?

Let's say there's a textView that I want to have shown after the button5 is clicked. How-to?

Answer 1

You will just do whatever you need to do to your TextView inside your onClick event, an example of how this may look:

button5.setOnClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                     TextView tv = findViewById(R.id.textViewInLayout);
                     //Change visibility                 
                     tv.setVisibility(View.VISIBLE);
                     //set a value in the textview
                     tv.setText("Hello World");
                }
    };

Answer 2

In your method onClick(View v) add a line:

myTextView.setVisibility(View.VISIBLE)

Where myTextView is the view containing the text you want to show.

Answer 3

Let's say there's a textView that I want to have shown after the button5 is clicked. How-to?

Define your TextView in XML as usual, but set its visibility to either invisible or gone :

<TextView android:id="@+id/textView1"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:visibility="invisible"
          />

( visibility="invisible" means the TextView will take up space in the layout, as though it were there, but won't actually appear. visibility="gone" means the TextView will not take up space in the layout at all, as though it were not there.)

Then, in your OnClickListener :

textView1.setVisibility(View.VISIBLE);

And the TextView will appear.

Alternatively, you can have the TextView be visible all along but with no text, and then call setText() in your listener.