我正在开发一个应用程序，其中我有一个字符串数组。我想将字符串数组文本转换为语音。但是我遇到了这个错误。 我正在为字符串数组提供索引，以便它可以在OnDone UtteranceProgressListener((上将其转换为语音。
这是我的代码：
public class MainActivity extends AppCompatActivity implements TextToSpeech.OnInitListener {
TextView textView;
Button button;
private boolean initialized;
private String[] queuedText;
private String TAG = "TTS";
private TextToSpeech tts;
int i = 0;
String[] Story = getResources().getStringArray(R.array.Storytxt);
String ajay = ("Once, a wolf was very hungry. It looked for food here and there. But it couldn't get any. At last, it found a loaf of bread and piece of meat in the hole of a tree.n" +
"n" +
"The hungry wolf squeezed into the hole. It ate all the food. It was a woodcutter's lunch. He was on his way back to the tree to have lunch. But he saw there was no food in the hole, instead, a wolf.n" +
"n" +
"On seeing the woodcutter, the wolf tried to get out of the hole. But it couldn't. Its tummy was swollen.n" +
"n" +
"The woodcutter caught the wolf and gave it nice beatings.");
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = findViewById(R.id.highlightxt);
textView.setText(ajay);
button = findViewById(R.id.button);
tts = new TextToSpeech(getApplicationContext() /* context */, this /* listener */);
tts.setOnUtteranceProgressListener(mProgressListener);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
speak(Story,i);
}
});
}
private void speak(String[] text, int i) {
i = 0;
if(!initialized){
queuedText[i] = text[i];
return;
}
queuedText = null;
setTtsListner();
HashMap<String , String> map = new HashMap<String, String>();
map.put(TextToSpeech.Engine.KEY_PARAM_UTTERANCE_ID,"Message ID");
tts.speak(text[i],TextToSpeech.QUEUE_ADD, map);
}
private void setTtsListner() {
}
@Override
public void onInit(int status) {
if (status == TextToSpeech.SUCCESS) {
initialized = true;
tts.setLanguage(Locale.ENGLISH);
if (queuedText != null) {
speak(queuedText,i);
}
}
}
private abstract class runnable implements Runnable {
}
private UtteranceProgressListener mProgressListener = new UtteranceProgressListener() {
@Override
public void onStart(String utteranceId) {
} // Do nothing
@Override
public void onError(String utteranceId) {
} // Do nothing.
@Override
public void onDone(String utteranceId) {
new Thread() {
public void run() {
MainActivity.this.runOnUiThread(new runnable() {
public void run() {
Toast.makeText(getBaseContext(), "TTS Completed", Toast.LENGTH_SHORT).show();
}
});
}
}.start();
i = i+1;
speak(Story, i);
}
};
}
我遇到了这个错误。
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.gujja.ajay.texthight/com.gujja.ajay.texthight.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference
我不知道为什么我会得到这个。 这是因为字符串数组吗？
<string-array name="Storytxt">
<item>Once, a wolf was very hungry. It looked for food here and there. But it couldn't get any. At last it found a loaf of bread and piece of meat in the hole of a tree.</item>
<item>The hungry wolf squeezed into the hole. It ate all the food. It was a woodcutter's lunch. He was on his way back to the tree to have lunch. But he saw there was no food in the hole, instead, a wolf.</item>
<item>On seeing the woodcutter, the wolf tried to get out of the hole. But it couldn't. Its tummy was swollen.</item>
<item>The woodcutter caught the wolf and gave it nice beatings.</item>
</string-array>
看起来你正在尝试在上下文上使用getResources(((在本例中隐含的是MainActivity类，'this'(...尚未初始化...因为 onCreate 尚未运行。
因此，您可能只需要：
改变：
String[] Story = getResources().getStringArray(R.array.Storytxt);
自：
String[] Story;
然后在 onCreate 中，放置：
Story = getResources().getStringArray(R.array.Storytxt);