需要Gradle 2.10以上，Android Studio 2.0以上

// 修改app/build.gradle里android.signingConfigs.release
    signingConfigs {
        release {
            storeFile file("your_real.keystore")
            storePassword "your_keystore_password"
            keyAlias "your_keystore_alias"
            keyPassword "your_key_password"
        }
    }
    // 后面的内容请替换为实际值

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