android – 局部变量或实例字段名称与正则表达式'[a-z]不匹配

Instance field name doesn't match regex '[a-z]+'
Local variable name doesn't match regex '[a-z]+'
Instance field access is not qualified with 'this'

这是截图.

如果我将同一个类文件复制到另一个新项目,则没有警告.只有旧项目会显示这些警告.@H_616_14@这是我的build.gradle文件：

apply plugin: 'com.android.application'
android {
    compileSdkVersion 24
    buildToolsVersion "24.0.1"

    defaultConfig {
        applicationId "com.example.app"
        minSdkVersion 10
        targetSdkVersion 24
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'),'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs',include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:24.1.0'
    compile 'com.android.support:design:24.1.0'
    androidTESTCompile 'junit:junit:4.12'
}

我试过File菜单 – >无效的缓存/重启,它没有帮助.@H_616_14@我想解决问题,而不是忽略警告.@H_616_14@任何帮助深表感谢.谢谢.