我已经从其他人与该问题相关的问题中阅读了许多其他论坛,但仍然无法使我的代码正常工作。我的代码找不到任何错误,但后端(Java页面)和布局页面却出现错误。
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'具有不正确的签名。检查在相关活动中是否声明了onClick XML属性中指定的方法”
我的代码如下所示。
先感谢您!
主要活动(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"/>
我的主要活动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));
}
});
{
}
清单页:
<?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>
最佳答案
1。
首先,您需要将buttonAbout1方法公开。
2然后需要将View作为参数传递
public void buttonAbout1(View v) {
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));
}
});
}
这是一个快速提示
避免自己制作onClick方法。而是尝试使用android studio的意图动作(ALT + ENTER)为您生成。当您在xml中添加android:onClick =“ buttonAbout1”时,请按ALT + ENTER(确保光标位于onClick),然后在GMOEd中选择“创建'buttonAbout1(View)”,这将在您的活动中创建方法。
希望有帮助!