android - 为什么当我单击按钮调用第二个活动时我的应用程序停止工作？

Question

我有一个简单的应用程序，在主选项卡上，我有一个按钮。单击按钮时，假设启动另一个选项卡。但是，当我单击按钮时，屏幕变为空白，并显示：

不幸的是 appname 已停止

我哪里做错了？

代码片段包括：

1. MainActivity.Java

      public class MainActivity extends Activity {
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
   }
   
   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
           // Inflate the menu; this adds items to the action bar if it is present.
           getMenuInflater().inflate(R.menu.main, menu);
           return true;
   }
   
   public void serveMenu(View view) {
     // Do something in response to button
   Intent intent = new Intent(this, ServeMenuActivity.class);
   startActivity(intent);
   
     }
       }
   

2. ServeMenuActivity.Java

    import android.app.Activity;
    import android.content.Intent;
    import android.os.Bundle;
    import android.view.Menu;
   
      public class ServeMenuActivity extends Activity {
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_serve_menu);
   Intent intent = getIntent();
   }
   
   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
   // Inflate the menu; this adds items to the action bar if it is present.
   getMenuInflater().inflate(R.menu.serve_menu, menu);
   return true;
    }
   
      }
   

3. AdriodManifest.xml

           <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
   </activity>
   <activity
       android:name="com.mywinsystems.tkrctennistips.ServeMenuActivity"
       android:label="@string/title_activity_serve_menu" >
   
   </activity>
   

Answer 1

检查是否在 main.xml 按钮上添加了 onClick serveMenu，即android:onClick="serveMenu"

Answer 2

10-06 17:30:41.249: D/OpenGLRenderer(18009): Enabling debug mode 0 10-06 17:31:46.774: D/AndroidRuntime(18009): Shutting down VM 10-06 17:31:46.774: W/dalvikvm(18009): threadid=1: thread exiting with uncaught exception (group=0x4108f2a0) 10-06 17:31:46.784: E/AndroidRuntime(18009): FATAL EXCEPTION: main 10-06 17:31:46.784: E/AndroidRuntime(18009): java.lang.IllegalStateException: Could not find a method ServeMenu(View) in the activity class com.mywinsystems.tkrctennistips.MainActivity for onClick handler on view class android.widget.Button with id 'button1' 

根据您上面的 locgcate 尝试重命名

public void serveMenu(View view) {
  // Do something in response to button
Intent intent = new Intent(this, ServeMenuActivity.class);
startActivity(intent);

  }

至

public void ServeMenu(View view) {
  // Do something in response to button
Intent intent = new Intent(this, ServeMenuActivity.class);
startActivity(intent);

  }