Android R. 无法在可绘制文件夹中找到选项卡(清理和重建后的前夕)

Question

只是回到我前几天正在工作的项目 - 当我离开它时，它正在运行，今天 错误:(67, 93) 错误:找不到符号变量 drawtab1。 list 可能有问题，尝试重建和清理。但是 drawtab1 没有显示..

TabHost tabHost = getTabHost();

        // Tab for login
        TabSpec Login = tabHost.newTabSpec("Login");
        // setting Title and Icon for the Tab
        Login.setIndicator("", getApplicationContext().getResources().getDrawable(R.drawable.drawtab1));
        Intent LoginIntent = new Intent(this, Tab1Activity.class);
        LoginIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        Login.setContent(LoginIntent);

这是drawtab1

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- When selected -->
    <item android:drawable="@drawable/login"
          android:state_selected="true" />
    <!-- When not selected -->
    <item android:drawable="@drawable/login" />
</selector>

这是Mainfest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.tabdemo"
    android:versionCode="1"
    android:versionName="1.0" >
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <uses-sdk
        android:minSdkVersion="22"
        android:targetSdkVersion="22" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" 
            android:theme="@android:style/Theme.NoTitleBar"



            >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".Tab1Activity"
            android:label="@string/title_activity_tab1" >
        </activity>
        <activity
            android:name=".Tab2Activity"
            android:label="@string/title_activity_tab2" >
        </activity>
        <activity
            android:name=".Tab3Activity"
            android:label="@string/title_activity_tab3" >
        </activity>


    </application>

</manifest>

如有任何帮助，我们将不胜感激。

Answer 1

这里可能有几种情况

 1. make sure there is not import android.R import statement.
 2. no error in typos in xml file.
 3. use only a-z and 0-9 for resource name it must not contain any capital letters or special symbol. Then clean and sync your project.