Android 實戰記錄 (6) - finished with non-zero exit value 2

解決方法如下：
http://stackoverflow.com/questions/33296786/error-finished-with-non-zero-exit-value2

http://developer.android.com/intl/zh-tw/tools/building/multidex.html

    defaultConfig {
        ...
        minSdkVersion 14
        targetSdkVersion 21
        ...

        // Enabling multidex support.
        multiDexEnabled true
    }