点击按钮后如何使文本显示

Question

我正在尝试制作一个简单的应用程序，当你点击按钮时会显示文本。但我遇到了一个问题，就是当我点击按钮时，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" />

- Mihajlo Milosevic

---

这个问题并不愚蠢，所以我编辑并删除了那个声明。编程愉快！ - Xenolion

Answer 1

你正在初始化一个 onClickListener，但是你没有将它附加到任何对象上。尝试像这样将 onClickListener 附加到您的按钮上：

button.setOnClickListener(ourOnClickListener);

- Noterezeck

Answer 2

没有任何点击事件发生，因为你还没有在按钮上设置onClickListener，你只是定义了onClick的功能。 在你的onCreate中添加这一行： button.setOnClickListener(ourOnClickListener)。

- Mahima MS

Answer 3

解决方案：

不要这样做：

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.");
    }
};

写成这样：

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.");

    }
};

希望对你有所帮助。

- Ümañg ßürmån

Answer 4

你应该这样写，

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.");

        }
    });

- Show Young Soyinka