问题描述
我想使用Google Text-to-Speech来简单地听到音频“ Hello World”。
这是我到目前为止尝试过的（代码主要来自Google documentation）：
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
public void onClick(View view) {
try {
hello();
} catch (Exception e) {
e.printstacktrace();
}
}
/** Demonstrates using the Text-to-Speech API. */
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public void hello() throws Exception {
// Instantiates a client
try (TextToSpeechClient textToSpeechClient = TextToSpeechClient.create()) {
// Set the text input to be synthesized
SynthesisInput input = SynthesisInput.newBuilder().setText("Hello,World!").build();
// Build the voice request,select the language code ("en-US") and the ssml voice gender
// ("neutral")
VoiceSelectionParams voice =
VoiceSelectionParams.newBuilder()
.setLanguageCode("en-US")
.setSsmlGender(SsmlVoiceGender.NEUTRAL)
.build();
// Select the type of audio file you want returned
AudioConfig audioConfig =
AudioConfig.newBuilder().setAudioEncoding(AudioEncoding.MP3).build();
// Perform the text-to-speech request on the text input with the selected voice parameters and
// audio file type
SynthesizeSpeechResponse response =
textToSpeechClient.synthesizeSpeech(input,voice,audioConfig);
// Get the audio contents from the response
ByteString audioContents = response.getAudioContent();
// Write the response to the output file.
try (OutputStream out = new FileOutputStream("output.mp3")) {
out.write(audioContents.toByteArray());
System.out.println("Audio content written to file \"output.mp3\"");
}
}
}
如果我运行我的应用程序并单击一个按钮，我什么也听不到，但也没有收到任何错误。这是e.printstacktrace();返回的结果：
W/System.err: android.os.networkonmainthreadException
W/System.err: at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1450)
W/System.err: at java.net.Inet6AddressImpl.lookupHostByName(Inet6AddressImpl.java:102)
at java.net.Inet6AddressImpl.lookupAllHostAddr(Inet6AddressImpl.java:90)
at java.net.InetAddress.getAllByName(InetAddress.java:787)
W/System.err: at com.android.okhttp.Dns$1.lookup(Dns.java:39)
at com.android.okhttp.internal.http.RouteSelector.resetNextInetSocketAddress(RouteSelector.java:175)
at com.android.okhttp.internal.http.RouteSelector.nextProxy(RouteSelector.java:141)
at com.android.okhttp.internal.http.RouteSelector.next(RouteSelector.java:83)
W/System.err: at com.android.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:174)
at com.android.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:126)
W/System.err: at com.android.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:95)
at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:281)
at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:224)
W/System.err: at com.android.okhttp.internal.huc.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:461)
at com.android.okhttp.internal.huc.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:127)
W/System.err: at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:148)
at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:84)
at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:1012)
at com.google.auth.oauth2.ComputeEngineCredentials.runningOnComputeEngine(ComputeEngineCredentials.java:237)
W/System.err: at com.google.auth.oauth2.DefaultCredentialsProvider.tryGetComputeCredentials(DefaultCredentialsProvider.java:302)
at com.google.auth.oauth2.DefaultCredentialsProvider.getDefaultCredentialsUnsynchronized(DefaultCredentialsProvider.java:212)
at com.google.auth.oauth2.DefaultCredentialsProvider.getDefaultCredentials(DefaultCredentialsProvider.java:126)
at com.google.auth.oauth2.GoogleCredentials.getApplicationDefault(GoogleCredentials.java:119)
at com.google.auth.oauth2.GoogleCredentials.getApplicationDefault(GoogleCredentials.java:91)
at com.google.api.gax.core.GoogleCredentialsProvider.getCredentials(GoogleCredentialsProvider.java:67)
at com.google.api.gax.rpc.ClientContext.create(ClientContext.java:142)
at com.google.cloud.texttospeech.v1.stub.GrpcTextToSpeechStub.create(GrpcTextToSpeechStub.java:74)
at com.google.cloud.texttospeech.v1.stub.TextToSpeechStubSettings.createStub(TextToSpeechStubSettings.java:104)
W/System.err: at com.google.cloud.texttospeech.v1.TextToSpeechClient.<init>(TextToSpeechClient.java:128)
at com.google.cloud.texttospeech.v1.TextToSpeechClient.create(TextToSpeechClient.java:109)
at com.google.cloud.texttospeech.v1.TextToSpeechClient.create(TextToSpeechClient.java:101)
at ch.yourclick.kitt.MainActivity.hello(MainActivity.java:69)
at ch.yourclick.kitt.MainActivity.onClick(MainActivity.java:58)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:397)
at android.view.View.performClick(View.java:6294)
at android.view.View$PerformClick.run(View.java:24770)
at android.os.Handler.handleCallback(Handler.java:790)
at android.os.Handler.dispatchMessage(Handler.java:99)
W/System.err: at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
我在做什么错了？
解决方法
日志准确地表明您在做什么错。您需要在后台线程内执行hello()的操作，而不是在主线程中执行。
有几种方法可以在后台线程中运行您的操作。下面是一个简单的实现。
@Override
public void onClick(View view) {
try {
Thread ttsThread = new Thread() {
public void run() {
hello();
}
};
ttsThread.start();
} catch (Exception e) {
e.printStackTrace();
}
}