java - 如何让我的按钮在 Android Studio 中打开第二个 Activity？

Question

我已经阅读了许多其他论坛中其他人与此问题相关的问题，但仍然无法让我的代码正常工作。我找不到我的代码有任何问题，但后端(Java 页面)和布局页面出现错误。

对于 Java 页面，它说:“在 android:onClick 属性的父级或祖先上下文中找不到方法 buttonAbout1(View)”

对于布局页面，它说:“‘GMOEd’中的方法‘buttonAbout1’签名不正确。检查 onClick XML 属性中指定的方法是否在相关 Activity 中声明”

我的代码如下所示。

提前谢谢您!

主要 Activity (activity_gmoed)

<Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="About"
        android:id="@+id/buttonAbout1"
        android:background="#ffffff"
        android:foregroundTint="#ffffff"
        android:layout_below="@+id/textView2"
        android:layout_alignLeft="@+id/textView2"
        android:layout_alignStart="@+id/textView2"
        android:onClick="buttonAbout1"/>

我的主要 Activity Java 页面 (GMOEd.Java)

public class GMOEd extends AppCompatActivity {

    /**
     * ATTENTION: This was auto-generated to implement the App Indexing API.
     * See https://g.co/AppIndexing/AndroidStudio for more information.
     */
    private GoogleApiClient client;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_gmoed);
        // ATTENTION: This was auto-generated to implement the App Indexing API.
        // See https://g.co/AppIndexing/AndroidStudio for more information.
        client = new GoogleApiClient.Builder(this).addApi(AppIndex.API).build();
    }

    private void buttonAbout1() {
        Button buttonAbout1 = (Button) findViewById(R.id.buttonAbout1);
        assert buttonAbout1 != null;
        buttonAbout1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(GMOEd.this,About2.class));
            }
        });
        {


        }

list 页面:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android.gmoed">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".GMOEd">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".About2"></activity>
        <!-- ATTENTION: This was auto-generated to add Google Play services to your project for
             App Indexing.  See https://g.co/AppIndexing/AndroidStudio for more information. -->
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
    </application>

</manifest>

Answer 1

尝试将 private void buttonAbout1() 的参数更改为 private void buttonAbout1(View v)