Question

我正在尝试制作一个简单的应用程序，当您单击按钮文本时出现。但是我遇到了一个问题，当我单击按钮时什么也没发生。

public class MainActivity extends AppCompatActivity {
    private TextView textView;
    private Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById(R.id.textView);
        textView.setMovementMethod(new ScrollingMovementMethod());

        button = (Button) findViewById(R.id.button);

        View.OnClickListener ourOnClickListener = new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                textView.setText("It real sent your at. Amounted all shy set why followed declared. Repeated of endeavor mr position kindness offering ignorant so up. Simplicity are melancholy preference considered saw companions. Disposal on outweigh do speedily in on. Him ham although thoughts entirely drawings. Acceptance unreserved.");

            }
        };


    }
}

XML

  <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="84dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="374dp"
        android:layout_height="331dp"
        android:layout_marginEnd="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="16dp"
        android:textSize="8sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

Answer 1

您正在启动onClickListener，但没有将其附加到任何对象。尝试将onClickListener附加到按钮上，如下所示：

button.setOnClickListener(ourOnClickListener);

Answer 2

单击时没有任何反应，因为尚未在按钮上设置onClickListener，因此仅定义了onClick的功能。在您的onCreate中添加以下行： button.setOnClickListener(ourOnClickListener)。

Answer 3

解决方案：

代替此：

View.OnClickListener ourOnClickListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        textView.setText("It real sent your at. Amounted all shy set why followed declared. Repeated of endeavor mr position kindness offering ignorant so up. Simplicity are melancholy preference considered saw companions. Disposal on outweigh do speedily in on. Him ham although thoughts entirely drawings. Acceptance unreserved.");
    }
};

这样写：

button.setOnClickListener(new View.OnClickListener) {
    @Override
    public void onClick(View v) {
        textView.setText("It real sent your at. Amounted all shy set why followed declared. Repeated of endeavor mr position kindness offering ignorant so up. Simplicity are melancholy preference considered saw companions. Disposal on outweigh do speedily in on. Him ham although thoughts entirely drawings. Acceptance unreserved.");

    }
};

希望有帮助。

Answer 4

您应该这样写，

button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            textView.setText("It real sent your at. Amounted all shy set why followed declared. Repeated of endeavor mr position kindness offering ignorant so up. Simplicity are melancholy preference considered saw companions. Disposal on outweigh do speedily in on. Him ham although thoughts entirely drawings. Acceptance unreserved.");

        }
    });

单击按钮后如何显示文本

4 个答案: