Android - 需要一个活动,但不想进行一项活动?
问题描述:
我想创建一个使用textToSpeak的应用程序。显然textToSpeak必须在一个活动中使用才能工作。Android - 需要一个活动,但不想进行一项活动?
但是我不能在正常的java类中使用textToSpeak,所以我可以在当前正在运行的活动中实例化它并调用一个方法,使textToSpeech能够发出特定的文本。
我设法让TTS在一个单独的项目时工作,它是运行的活动,但是我不能让它在AA不同的一个实例...
说话类(持有TTS,有问题行是“私人文字转语音TTS =新的文字转语音(这一点,这一点);” - 提供了一个未捕获的异常
import java.util.Locale;
import android.app.Activity;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.util.Log;
public class Speech extends Activity implements TextToSpeech.OnInitListener {
private TextToSpeech tts = new TextToSpeech(this, this);
private String toRead;
public void speak()
{
speakOut();
}
public void changeText(String changeTo)
{
toRead = changeTo;
}
@Override
public void onDestroy() {
// Don't forget to shutdown tts!
if (tts != null) {
tts.stop();
tts.shutdown();
}
super.onDestroy();
}
public void onInit(int status) {
if (status == TextToSpeech.SUCCESS) {
int result = tts.setLanguage(Locale.US);
if (result == TextToSpeech.LANG_MISSING_DATA
|| result == TextToSpeech.LANG_NOT_SUPPORTED) {
Log.e("TTS", "This Language is not supported");
} else {
speakOut();
}
} else {
Log.e("TTS", "Initilization Failed!");
}
}
private void speakOut() {
tts.speak(toRead, TextToSpeech.QUEUE_FLUSH, null);
}
}
运行活动(编辑,以显示我要如何使用语音类)
public class Text_entry extends Activity implements OnTouchListener{
private Speech speech = new Speech();
public boolean onTouch(View v, MotionEvent event) {
speech.changeText(toRead);
speech.speak();
}
}
这个设置对其他对象来说工作得很好,因为TTS需要成为一个活动的一部分(如果语言没有扩展活动,它是无法识别的)我似乎没有工作。任何人都可以提供解决方案吗?
logcat的
02-16 16:52:46.698: D/AndroidRuntime(22541): Shutting down VM
02-16 16:52:46.698: W/dalvikvm(22541): threadid=1: thread exiting with uncaught exception (group=0x415fe300)
02-16 16:52:46.703: E/AndroidRuntime(22541): FATAL EXCEPTION: main
02-16 16:52:46.703: E/AndroidRuntime(22541): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{org.BT/org.BT.Text_entry}: java.lang.NullPointerException
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2024)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.app.ActivityThread.access$600(ActivityThread.java:140)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.os.Handler.dispatchMessage(Handler.java:99)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.os.Looper.loop(Looper.java:137)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.app.ActivityThread.main(ActivityThread.java:4898)
02-16 16:52:46.703: E/AndroidRuntime(22541): at java.lang.reflect.Method.invokeNative(Native Method)
02-16 16:52:46.703: E/AndroidRuntime(22541): at java.lang.reflect.Method.invoke(Method.java:511)
02-16 16:52:46.703: E/AndroidRuntime(22541): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006)
02-16 16:52:46.703: E/AndroidRuntime(22541): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773)
02-16 16:52:46.703: E/AndroidRuntime(22541): at dalvik.system.NativeStart.main(Native Method)
02-16 16:52:46.703: E/AndroidRuntime(22541): Caused by: java.lang.NullPointerException
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.content.ContextWrapper.getContentResolver(ContextWrapper.java:91)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.speech.tts.TtsEngines.getDefaultEngine(TtsEngines.java:75)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.speech.tts.TextToSpeech.getDefaultEngine(TextToSpeech.java:1235)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.speech.tts.TextToSpeech.initTts(TextToSpeech.java:595)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.speech.tts.TextToSpeech.<init>(TextToSpeech.java:553)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.speech.tts.TextToSpeech.<init>(TextToSpeech.java:527)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.speech.tts.TextToSpeech.<init>(TextToSpeech.java:512)
02-16 16:52:46.703: E/AndroidRuntime(22541): at org.BT.Speech.<init>(Speech.java:12)
02-16 16:52:46.703: E/AndroidRuntime(22541): at org.BT.Text_entry.<init>(Text_entry.java:48)
02-16 16:52:46.703: E/AndroidRuntime(22541): at java.lang.Class.newInstanceImpl(Native Method)
02-16 16:52:46.703: E/AndroidRuntime(22541): at java.lang.Class.newInstance(Class.java:1319)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.app.Instrumentation.newActivity(Instrumentation.java:1057)
02-16 16:52:46.703: E/AndroidRuntime(22541): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2015)
02-16 16:52:46.703: E/AndroidRuntime(22541): ... 11 more
答
不要延长Activity
。传递一个Context
给构造来代替:
public class Speech implements TextToSpeech.OnInitListener {
private Context mContext;
private TextToSpeech tts;
public Speech(Context c) {
mContext = c;
tts = new TextToSpeech(c, this);
}
// Rest of class
}
然后构建它像这样:
public class Text_entry extends Activity implements OnTouchListener{
private Speech speech;
public void onCreate(Bundled saved) {
super.onCreate(saved);
speech = new Speech(this);
}
public boolean onTouch(View v, MotionEvent event) {
speech.changeText(toRead);
speech.speak();
}
}
这绝对已经在朝着正确的方向迈出的一步。我不再有任何错误和Logcat状态我已经成功绑定到com.google.android.tts并连接到TTS服务 现在唯一的问题是没有声音:( – user2052839 2013-02-16 17:42:25
@ user2052839手机是否处于USB调试模式?这可能导致没有声音出来TTS也可以花一些时间来初始化之前,它能说话 – Eric 2013-02-16 17:43:31
编码绝对在模拟器上工作...只是要弄清楚为什么它不是在电话上。不仅如此,这是行不通的 - 这是TTS在主要活动中不起作用的独立示例,也是 – user2052839 2013-02-16 17:59:42