java – 单击按钮后如何显示文本

我正在尝试创建一个简单的应用程序,当您单击按钮文本时出现.但我有一个问题,当我点击按钮没有任何反应.

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" />

解决方法:

您正在启动onClickListener,但您没有将它附加到任何对象.尝试将onClickListener附加到您的按钮,如下所示：

button.setonClickListener(ourOnClickListener);