Android 安卓标签上的按钮

我正试图在Android上的标签视图上添加一个按钮。一切编译和构建都很好，但应用程序无法启动。MenuActivity是一个称为选项卡小部件菜单的特定选项卡的活动

这是我的代码：

package ru.infolizard.medinfo;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MenuActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.menu);

        Button button = (Button)this.findViewById(R.id.buttonSearch);
        button.setOnClickListener(new OnClickListener () { 

             public void onClick(View v) { 
                 //Toast.makeText(MenuActivity.this, "Menu pressed", Toast.LENGTH_SHORT).show();
             }  
        });
    }
}

这是LogCat：

    02-03 17:58:41.255: E/AndroidRuntime(1065): FATAL EXCEPTION: main
02-03 17:58:41.255: E/AndroidRuntime(1065): java.lang.RuntimeException: Unable to start activity ComponentInfo{ru.infolizard.medinfo/ru.infolizard.medinfo.MedInfoTabWidgetActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{ru.infolizard.medinfo/ru.infolizard.medinfo.MenuActivity}: java.lang.NullPointerException
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.os.Handler.dispatchMessage(Handler.java:99)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.os.Looper.loop(Looper.java:137)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.ActivityThread.main(ActivityThread.java:4424)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at java.lang.reflect.Method.invokeNative(Native Method)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at java.lang.reflect.Method.invoke(Method.java:511)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at dalvik.system.NativeStart.main(Native Method)
02-03 17:58:41.255: E/AndroidRuntime(1065): Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{ru.infolizard.medinfo/ru.infolizard.medinfo.MenuActivity}: java.lang.NullPointerException
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.ActivityThread.startActivityNow(ActivityThread.java:1797)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:682)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.widget.TabHost.setCurrentTab(TabHost.java:346)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.widget.TabHost.addTab(TabHost.java:236)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at ru.infolizard.medinfo.MedInfoTabWidgetActivity.onCreate(MedInfoTabWidgetActivity.java:29)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.Activity.performCreate(Activity.java:4465)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
02-03 17:58:41.255: E/AndroidRuntime(1065):     ... 11 more
02-03 17:58:41.255: E/AndroidRuntime(1065): Caused by: java.lang.NullPointerException
02-03 17:58:41.255: E/AndroidRuntime(1065):     at ru.infolizard.medinfo.MenuActivity.onCreate(MenuActivity.java:18)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.Activity.performCreate(Activity.java:4465)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
02-03 17:58:41.255: E/AndroidRuntime(1065):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
02-03 17:58:41.255: E/AndroidRuntime(1065):     ... 21 more

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如果我对有关按钮的所有内容都进行了评论，它就可以正常工作

您的res/layout/menu.xml没有id为R.id.buttonSearch（id android:id=“@+id/buttonSearch”）

您也可以发布您的xml布局吗？您的代码找不到您的按钮，因此返回null。你们能发布你们的菜单布局xml吗？谢谢，伙计们。实际上，我需要仔细查看xml布局。我正在将另一个活动的按钮绑定到menuActivity的侦听器。我有两个按钮：R.id.button搜索R.id.button搜索第一个是菜单活动视图上的按钮，第二个是另一个活动视图上的按钮。我正在将R.id.buttonSearch绑定到菜单活动按钮。这就是为什么它编译得很好。