Question

我想显示与按钮对应的textView和知道图像是随机的图像。例如，当显示红色图像并单击按钮btn1时，将显示textView。

我尝试了这段代码，但textView仍然不可见。

public class colors extends AppCompatActivity {
Button btn1, btn2, btn4;
ImageView img;
TextView txt1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_colors);
    img = (ImageView) findViewById(R.id.imageView3);
    txt1 = (TextView) findViewById(R.id.txt);
    btn1 = (Button) findViewById(R.id.red);
    btn2 = (Button) findViewById(R.id.blue);
    btn4 = (Button) findViewById(R.id.green); //st.setEnabled(false); 

    int[] cards = {R.drawable.green, R.drawable.red, R.drawable.blue};
    Random r = new Random();
    final int n = r.nextInt(3);
    img.setImageResource(cards[n]);
    btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (n == 2) {
                txt1.setVisibility(View.VISIBLE);
            }
        }
    });
}

Answer 1

根据我对你的问题的理解，你想要的是：

public class colors extends AppCompatActivity {
    Button btn1, btn2, btn3;
    ImageView img;
    TextView txt1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        img = (ImageView) findViewById(R.id.imageView3);
        txt1 = (TextView) findViewById(R.id.txt);
        btn1 = (Button) findViewById(R.id.red);
        btn2 = (Button) findViewById(R.id.blue);
        btn3 = (Button) findViewById(R.id.green); //st.setEnabled(false);

        final int[] cards = {R.drawable.green, R.drawable.red, R.drawable.blue};
        Random r = new Random();
        final int n = r.nextInt(3);
        img.setImageResource(cards[n]);
        img.setId(cards[n]);
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // green is cards[0], red is cards[1], blue is cards[2]
                if (img.getId() == cards[1]) {
                    txt1.setVisibility(View.VISIBLE);
                } else {
                    // txt1.setVisibility(View.GONE);
                }
            }
        });
    }
}

将图像的ID设置为与int数组中的ID (R.drawable.red)相同。这样，您可以在稍后点击bt1时进行检查。

如何显示与随机图像对应的textView？

1 个答案: