Question

我正在构建一个通过将短信转换为语音来读取短信的应用。安装apk后，它会运行，但是当我关闭它并尝试再次打开它时，它会崩溃。它给出一条错误消息，指出该应用程序继续关闭。当我将其设置为仅在单击按钮后才能读取时，它工作正常，但是在将其更改为在初始化时读取后，就出现了此问题。请帮忙。

package com.example.receiver3;

import android.Manifest;
import android.content.ContentResolver;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.speech.tts.TextToSpeech;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Button;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Locale;

public class MainActivity extends AppCompatActivity {
   ListView listView;
   Button btConvert, btNext;

   private static final int PERMISSION_REQUEST_READ_CONTACTS = 100;
   ArrayList<String> smsList;
   TextToSpeech textToSpeech;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);

       listView = (ListView) findViewById(R.id.idList);

       int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_SMS);

        if (permissionCheck == PackageManager.PERMISSION_GRANTED){
        initializeTextToSpeech();     //edit
        showContact();
       }
       else{
           ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_SMS}, PERMISSION_REQUEST_READ_CONTACTS);
      }
       btConvert = findViewById(R.id.bt_stop);
       btNext = findViewById(R.id.bt_next);


       btConvert.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               //get list value
               for (String s : smsList) {
                   textToSpeech.stop();
               }
           }
       });
      Button button = (Button) findViewById(R.id.bt_next);
      button.setOnClickListener(new View.OnClickListener() {
         @Override
          public void onClick(View v) {
           openActivity();
       }
   });
   }
    private void initializeTextToSpeech() {       //edit
    textToSpeech = new TextToSpeech(getApplicationContext(), new TextToSpeech.OnInitListener() {
        @Override
        public void onInit(int i) {
            if (i == TextToSpeech.SUCCESS){
                int lang = textToSpeech.setLanguage(Locale.UK);
            }
        }
    });
   }
   public void openActivity(){
      Intent intent = new Intent(this, Main2Activity.class);
      startActivity(intent);
  }

  @Override
  public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    if (requestCode == PERMISSION_REQUEST_READ_CONTACTS){
        showContact();
        initializeTextToSpeech();  //edit
    }
    else {
        Toast.makeText(this, "Permission Required", Toast.LENGTH_SHORT).show();
    }
}

private void showContact() {
    Uri inboxUri = Uri.parse("content://sms/inbox");
    smsList = new ArrayList<>();
    ContentResolver contentResolver = getContentResolver();

    Cursor cursor = contentResolver.query(inboxUri,null, null, null, null);
    while (cursor.moveToNext()){
        String number = cursor.getString(cursor.getColumnIndexOrThrow("address")).toString();
        String body = cursor.getString(cursor.getColumnIndexOrThrow("body")).toString();
        smsList.add("Number: "+number+ "\n" + "Body: "+body);
    }
    for (String s : smsList) {
        textToSpeech.speak(s,TextToSpeech.QUEUE_ADD, null);
    }
    cursor.close();
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,smsList);
    listView.setAdapter(adapter);


  }
 public void speak() {       //edit
    for (String s : smsList) {
        textToSpeech.speak(s,TextToSpeech.QUEUE_ADD, null);
    }
}

@Override
protected void onPause() {      //edit
    super.onPause();
    textToSpeech.stop();
}

@Override
protected void onStop() {
    super.onStop();
    textToSpeech.stop();

}


@Override
protected void onResume() {     //edit
    super.onResume();
    showContact();
    initializeTextToSpeech();
} 
}

Answer 1

您现在要调用showContact()，然后依次调用textToSpeech.speak()和textToSpeech初始化textToSpeech = new TextToSpeech()对象。

由于用户尚未授予请求的权限并且showContact()未被调用，因此代码在第一次运行时效果很好。

您需要更改onCreate：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    listView = (ListView) findViewById(R.id.idList);

    int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_SMS);

    // *** MOVE THIS UP HERE. ***
    textToSpeech = new TextToSpeech(getApplicationContext(), new TextToSpeech.OnInitListener() {
        @Override
        public void onInit(int i) {
            if (i == TextToSpeech.SUCCESS){
                int lang = textToSpeech.setLanguage(Locale.UK);
                return;
            }
        }
    });

    if (permissionCheck == PackageManager.PERMISSION_GRANTED){
        showContact();
        return;
    } else {
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_SMS}, PERMISSION_REQUEST_READ_CONTACTS);
    }
    btConvert = findViewById(R.id.bt_convert);
    btNext = findViewById(R.id.bt_next);

    btConvert.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //get list value
            for (String s : smsList) {
                textToSpeech.stop();
            }
        }
    });
    Button button = (Button) findViewById(R.id.bt_next);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
            public void onClick(View v) {
            openActivity();
        }
    });
}

但是，仅仅因为TTS还没有立即准备好，这还不够。仅在运行onInit()回调并且在那里收到TextToSpeech.SUCCESS状态后，该功能才可用。

因此，如果您想在应用程序启动时尽快说点什么，则需要从onInit()中触发。

也许您可以想到这样的东西：

int permissionCheck = ContextCompat.checkSelfPermission(this, Manifest.permission.READ_SMS);
if (permissionCheck != PackageManager.PERMISSION_GRANTED){
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_SMS}, PERMISSION_REQUEST_READ_CONTACTS);
}

然后：

textToSpeech = new TextToSpeech(getApplicationContext(), new TextToSpeech.OnInitListener() {
    @Override
    public void onInit(int i) {
        if (i == TextToSpeech.SUCCESS){
            int lang = textToSpeech.setLanguage(Locale.UK);

            if (permissionCheck == PackageManager.PERMISSION_GRANTED){
                showContact();
            }
        }
    }
});

我完全不知道为什么您会接到return;电话。实际上，在原始代码中，return;退出了onCreate()，甚至在已经授予许可的情况下尝试初始化TTS之前。

我的应用程序第一次运行，然后每次尝试重新打开时崩溃

1 个答案: