package android.os;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

我添加了以下依赖项：

dependencies {

    compile group: 'com.google.code.findbugs',name: 'jsr305',version: '3.0.0'
    compile 'com.android.support:multidex:1.0.1'
    compile fileTree(include: ['*.jar'],dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:support-v4:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile 'com.parse:parse-android:1.12.0'
    compile fileTree(include: '*.jar',dir: 'libs')
    compile 'com.squareup.picasso:picasso:2.5.2'
    compile 'com.android.support:support-annotations:23.1.1'
}