java - 按钮点击错误...找不到方法

Question

我似乎无法从我的 Button 启动新的 Activity，我已在此处搜索答案，但似乎无法解决问题。我希望有人有一个简单的解决方案。提前致谢。

这是错误:

E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.IllegalStateException: Could not find a method openSearch(View) in the 
activity class dk.mathias.splitcab.MainActivity 
for onClick handler on view class android.widget.Button with id 'btnStartSearch'

MainActivity.java

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

}

public void openSearch(){
    Intent openSearchIntent = new Intent(MainActivity.this, StartSearch.class);
    startActivity(openSearchIntent);
}

AndroidManifest.xml

    <activity
        android:name=".StartSearch"
        android:label="@string/title_activity_start_search" >
        <intent-filter>
            <action android:name="dk.mathias.splitcab.STARTSEARCH" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

activity_main.xml

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/StartSearch"
    android:id="@+id/btnStartSearch"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@+id/tvWelcome"
    android:layout_alignEnd="@+id/tvWelcome"
    android:onClick="openSearch"

    />

StartSearch.java

public class StartSearch extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_start_search);
    }
}

Answer 1

问题出在你的方法签名

public void openSearch(){

它应该有一个且只有一个参数，即 View。

更改为

public void openSearch(View v){

v 显然可以是您想要的任何内容，但您应该使其有意义，例如 v、view 等...

From the Docs

In order for this to work, the method must be public and accept a View as its only parameter.

See this answer有关添加 Buttons 和 OnClick

的更详细说明