Android SDK 发生空指针异常：

java.lang.NullPointerException: Attempt to invoke interface method 'void com.baidu.tts.aop.tts.ITts.setMode(com.baidu.tts.f.m)' on a null object reference
at com.baidu.tts.a.b.a.a(SourceFile:86)
at com.baidu.tts.client.SpeechSynthesizer.initTts(SourceFile:240)
at com.shundao.tts.MySynthesizer.init(SourceFile:63)

MySynthesizer.init 是指下面这行代码：

// 初始化tts
int result = mSpeechSynthesizer.initTts(config.getTtsMode());