android - フラグメントのテキスト読み上げ

Question

エラーが発生しています。申し訳ありませんが、初心者のみです。すべての助けは素晴らしいでしょう。

  05-31 21:49:16.077: E/AndroidRuntime(655): FATAL EXCEPTION: main
  05-31 21:49:16.077: E/AndroidRuntime(655): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.appal.song/com.appal.song.MainActivity}: java.lang.NullPointerException
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread.access$600(ActivityThread.java:123)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.os.Handler.dispatchMessage(Handler.java:99)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.os.Looper.loop(Looper.java:137)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread.main(ActivityThread.java:4424)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at java.lang.reflect.Method.invokeNative(Native Method)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at java.lang.reflect.Method.invoke(Method.java:511)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at dalvik.system.NativeStart.main(Native Method)
  05-31 21:49:16.077: E/AndroidRuntime(655): Caused by: java.lang.NullPointerException
  05-31 21:49:16.077: E/AndroidRuntime(655):    at com.appal.song.Fragment_1.onCreateView(Fragment_1.java:33)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:551)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1133)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.Activity.performStart(Activity.java:4475)
  05-31 21:49:16.077: E/AndroidRuntime(655):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1929)
  05-31 21:49:16.077: E/AndroidRuntime(655):    ... 11 more

ここに完全なコードがあります。どんな助けでも素晴らしいでしょう、ありがとう、初心者だけごめんなさい。テキストを作成しようとすると、その横にテキストを音声で繰り返すボタンが作成されます。

 public class Fragment_1 extends Fragment implements OnClickListener, OnInitListener{
private TextToSpeech txts;
private static final String TAG = "TextToSpeechDemo";
private static final int MY_DATA_CHECK_CODE = 1234;

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_1,
            container, false);


        Button btnAdd = (Button) getView().findViewById(R.id.button1);
        btnAdd.setOnClickListener(this);
        btnAdd.setEnabled(false);

        TextView txt = (TextView) getView().findViewById(R.id.textView1);
        txt.setText("OnCreate");

        // Fire off an intent to check if a TTS engine is installed
        Intent checkIntent = new Intent();
        checkIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
        startActivityForResult(checkIntent, MY_DATA_CHECK_CODE);
    }
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        TextView txt = (TextView) getView().findViewById(R.id.textView1);
        if (requestCode == MY_DATA_CHECK_CODE)
        {
            if (resultCode == TextToSpeech.Engine.CHECK_VOICE_DATA_PASS)
            {
                // success, create the TTS instance
                txt.setText("Done result");
                txts = new TextToSpeech(this, this);
                txts.setLanguage(Locale.US);
                Button btnAdd = (Button) getView().findViewById(R.id.button1);
                btnAdd.setEnabled(true);

            }
            else
            {
                txt.setText("Missing");
                // missing data, install it
                Intent installIntent = new Intent();
                installIntent.setAction(
                        TextToSpeech.Engine.ACTION_INSTALL_TTS_DATA);
                startActivity(installIntent);
            }
        }
    }

    @Override
    public void onDestroy()
    {
        // Don't forget to shutdown!
        if (txts != null)
        {
            txts.stop();
            txts.shutdown();
        }
        super.onDestroy();
    }

    @Override
    public void onClick(View v) {

        TextView txt = (TextView) getView().findViewById(R.id.textView1);
                txt.setText("Click");

        String myText1 = "hello";
        String myText2 = "bye";
        txts.speak(myText1, TextToSpeech.QUEUE_FLUSH, null);
        txts.speak(myText2, TextToSpeech.QUEUE_ADD, null);
    }
    @Override
    public void onInit(int status) {
        TextView txt = (TextView) getView().findViewById(R.id.textView1);
        txt.setText("status 0");
        if (status == TextToSpeech.SUCCESS) {
                txt.setText("status 1");
            int result = txts.setLanguage(Locale.US);
            if (result == TextToSpeech.LANG_MISSING_DATA ||
                result == TextToSpeech.LANG_NOT_SUPPORTED) {
                txt.setText("status 2");
            } else {
                Button btnAdd = (Button) getView().findViewById(R.id.button1);
                btnAdd.setEnabled(true);
                txt.setText("status 3");
            }
            } else {
            txt.setText("status 4");
            Log.e(TAG, "Could not initialize TextToSpeech.");
        }
        return view;
    }
}

Answer 1

As I said in my comment: using this while in a Fragment refers to that Fragment's instance. Fragments aren't Contexts, hence the compile time error.

To make a new TextToSpeech Object, you should use:

txts = new TextToSpeech(getActivity(), this);

Activities extend Context, so that should fix this compile-time error.

Another potential problem: for the Buttons, TextViews, etc that you are setting up onCreateView() you should be using view.findViewById() instead of getView().findViewById() (but only for the Views you're setting up in onCreateView(). The rest of the getView() calls should be fine).

It's one less method call, and getView() probably returns null until onCreateView() returns the inflated View.

Lastly, onCreateView() needs to return a View, so just before its closing brace, add:

return view;

The method with appropriate changes:

public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_1,
            container, false);


        Button btnAdd = (Button) view.findViewById(R.id.button1);
        btnAdd.setOnClickListener(this);
        btnAdd.setEnabled(false);

        TextView txt = (TextView) view.findViewById(R.id.textView1);
        txt.setText("OnCreate");

        // Fire off an intent to check if a TTS engine is installed
        Intent checkIntent = new Intent();
        checkIntent.setAction(TextToSpeech.Engine.ACTION_CHECK_TTS_DATA);
        startActivityForResult(checkIntent, MY_DATA_CHECK_CODE);

        return view;
    }