我是Android开发的新手,我正在尝试在(android 4.4平台和三星Galaxy S4)上运行基本的文本到语音(TTS)代码,但应用程序一旦打开就会崩溃 . 给出了主要活动代码和系统消息的捕获屏幕 .
package com.example.ttscode;
import java.util.Locale;
import android.app.Activity;
import android.os.Bundle;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity implements
TextToSpeech.OnInitListener {
/** Called when the activity is first created. */
private TextToSpeech tts;
private Button btnSpeak;
private EditText txtText;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tts = new TextToSpeech(this, this);
btnSpeak = (Button) findViewById(R.id.action_settings);
txtText = (EditText) findViewById(R.id.action_settings);
// button on click event
btnSpeak.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
speakOut();
}
});
}
@Override
public void onDestroy() {
// Don't forget to shutdown tts!
if (tts != null) {
tts.stop();
tts.shutdown();
}
super.onDestroy();
}
@Override
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 {
btnSpeak.setEnabled(true);
speakOut();
}
} else {
Log.e("TTS", "Initilization Failed!");
}
}
private void speakOut() {
String text = txtText.getText().toString();
tts.speak(text, TextToSpeech.QUEUE_FLUSH, null);
}
}
图片位于此链接http://i.stack.imgur.com/CYvz2.jpg
这是logcat中的红色文本:
04-15 23:38:41.026:E / AndroidRuntime(32189):FATAL EXCEPTION:main 04-15 23:38:41.026:E / AndroidRuntime(32189):进程:com.example.ttscode,PID:32189 04- 15 23:38:41.026:E / AndroidRuntime(32189):java.lang.RuntimeException:无法启动活动ComponentInfo {com.example.ttscode / com.example.ttscode.MainActivity}:java.lang.NullPointerException 04-15 23 :38:41.026:E / AndroidRuntime(32189):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2305)04-15 23:38:41.026:E / AndroidRuntime(32189):在android.app.ActivityThread . handleLaunchActivity(ActivityThread.java:2363)04-15 23:38:41.026:E / AndroidRuntime(32189):at android.app.ActivityThread.access $ 900(ActivityThread.java:161)04-15 23:38:41.026:E / AndroidRuntime(32189):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1265)04-15 23:38:41.026:E / AndroidRuntime(32189):在android.os.Handler.dispatchMessage(Handler . java:102)04-15 23:38:41.026:E / AndroidRuntime(32189):在android.os.Looper.loop(Lo) oper.java:157)04-15 23:38:41.026:E / AndroidRuntime(32189):在android.app.ActivityThread.main(ActivityThread.java:5356)04-15 23:38:41.026:E / AndroidRuntime( 32189):at java.lang.reflect.Method.invokeNative(Native Method)04-15 23:38:41.026:E / AndroidRuntime(32189):at java.lang.reflect.Method.invoke(Method.java:515) 04-15 23:38:41.026:E / AndroidRuntime(32189):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1265)04-15 23:38:41.026:E / AndroidRuntime( 32189):at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081)04-15 23:38:41.026:E / AndroidRuntime(32189):at dalvik.system.NativeStart.main(Native Method) 04-15 23:38:41.026:E / AndroidRuntime(32189):引起:java.lang.NullPointerException 04-15 23:38:41.026:E / AndroidRuntime(32189):at com.example.ttscode.MainActivity.onCreate (MainActivity.java:33)04-15 23:38:41.026:E / AndroidRuntime(32189):在android.app.Activity.performCreate(Activity.java:5426)04-15 23:38:41.026:E / AndroidRuntime (32189):a t android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)04-15 23:38:41.026:E / AndroidRuntime(32189):at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2269)04-15 23 :38:41.026:E / AndroidRuntime(32189):... 11更多04-15 23:38:47.171:I / Process(32189):发送信号 . PID:32189 SIG:9
2 回答
你可以像这样使用:
并且不要忘记给予互联网许可:
您使用相同的ID在此处查找两个不同的视图:
当您尝试将
onClickListener
分配给btnSpeak
时,看起来它会导致NullPointerException