Android Studio"无法解析符号字符串"

Question

我有一个在Eclipse中启动的小项目.然后我将其导出到gradle文件,并将其导入AS(0.5.7).

起初,似乎没有多少工作,但在"build => make project"之后,我似乎没有得到任何突出显示的错误.

所以我尝试将应用程序运行到模拟设备.好吧,该设备从未启动,现在我在"String","ArrayList"等提及下得到红色波浪线,称它"无法解析符号".

什么f？

我尝试过清理和重建,以及"使用gradle文件同步项目".

我从哪里开始？我想继续在AS开发这么糟糕!

编辑:项目设置的屏幕截图:http://i.imgur.com/ycNyPaT.png

build.gradle的内容:

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.9.+'
    }
}
apply plugin: 'android'

dependencies {
    compile fileTree(dir: 'libs', include: '*.jar')
}

android {
    compileSdkVersion 19
    buildToolsVersion "19.0.1"

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            resources.srcDirs = ['src']
            aidl.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            res.srcDirs = ['res']
            assets.srcDirs = ['assets']
        }

        // Move the tests to tests/java, tests/res, etc...
        instrumentTest.setRoot('tests')

        // Move the build types to build-types/<type>
        // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
        // This moves them out of them default location under src/<type>/... which would
        // conflict with src/ being used by the main source set.
        // Adding new build types or product flavors should be accompanied
        // by a similar customization.
        debug.setRoot('build-types/debug')
        release.setRoot('build-types/release')
    }
}

Answer 1

有更简单的方法,我认为更正确的方法:

只需选择菜单项'文件/无效缓存/重新启动...'

对我来说,这成功地解决了这个问题(由于电脑的惊人断电造成的)