相关疑难解决方法(0)

我正在尝试按照此方法为我的应用程序获取Material Design .

每当我运行App时,它都会显示以下错误:

扩展类android.support.v7.widget.Toolbar时出错.

我检查了我是否正确添加了appcompat.但这对我来说都是正确的.那么请告诉我,我做错了什么？

的build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion '21.0.2'

    defaultConfig {
        applicationId "io.bxbxbai.feedlistviewdemo"
        minSdkVersion 14
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles 'proguard-rules.pro'
        }
    }
}

configurations {
    all*.exclude group: 'com.android.support', module: 'support-v4'
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile project(':materialDesign')
    compile 'com.balysv.materialmenu:material-menu:1.4.0'
    compile 'com.android.support:appcompat-v7:21.+'
}

logcat的

02:11.641  20583-20583/io.bxbxbai.feedlistviewdemo E/AndroidRuntime? FATAL EXCEPTION: main
    Process: io.bxbxbai.feedlistviewdemo, PID: 20583
    java.lang.RuntimeException: Unable to start activity …