android_studio xmln自定义不识别问题

方法一：引入aar包方法

将aar包赋值到libs目录下

 //这句很重要，亲身试验
 repositories { flatDir { dirs 'libs' } }

dependencies {
 compile fileTree(include: ['*.jar'], dir: 'libs')
 testCompile 'junit:junit:4.12'
 compile 'com.android.support:appcompat-v7:23.1.1'
 compile 'com.android.support:design:23.1.1'

//这样引用
 compile(name: 'mylibrary-debug', ext: 'aar')
 }

方法二、将第三方库作为module导入到工程，然后在自己的module中添加第三方module库依赖

        dependencies {
        compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.2.0'
    compile 'com.android.support:support-v4:22.2.0'
    compile project(':percent-support-extends')
        }