java - 意图未定义

Question

所以我知道 myIntent是未定义的，与此类的构造函数有关，但我对 Java 太陌生，无法找出问题所在，也许你能帮忙？

serviceIntent = new Intent(this, myPlayService.class);

编码：

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    podcastPlayerLayout = inflater.inflate(R.layout.activity_podcast_player, container, false);


    try {
        serviceIntent = new Intent(this, myPlayService.class);

        // --- set up seekbar intent for broadcasting new position to service ---
        intent = new Intent(BROADCAST_SEEKBAR);

        initViews();
        setListeners();
    } catch (Exception e) {
        e.printStackTrace();
        Toast.makeText(getApplicationContext(),
                e.getClass().getName() + " " + e.getMessage(),
                Toast.LENGTH_LONG).show();
    }



   //Adding Listener to button
     streamSetButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            fileStreamAdress = streamSetButton.getText().toString();


            playPauseButtonClicked();
        }
    });

     playPauseButton.setOnClickListener(new View.OnClickListener() {

         @Override
         public void onClick(View v) {
             // TODO Auto-generated method stub

            fileStreamAdress = streamSetButton.getText().toString();


             playPauseButtonClicked();
         }


     });



    // Inflate the layout for this fragment
    return podcastPlayerLayout;


}

Answer 1

我猜this是指适配器而不是上下文。尝试：

serviceIntent = new Intent(getApplicationContext(), myPlayService.class);

或者

serviceIntent = new Intent(MainActivity.this, myPlayService.class);
// Where MainActivity is the Activity class's name

原因是 Activity 是 Context 的子类，而 Adapters 不是...

Answer 2

意图未定义

当变量未在作用域（或）类型中对编译器不明确时，您将收到这些错误。

serviceIntent = new Intent(BROADCAST_SEEKBAR);

在这一行中，您没有输入变量intent。

它应该是这样的

Intent serviceIntent = new Intent(BROADCAST_SEEKBAR);

Answer 3

确保你有：

import android.content.Intent;

在您的导入中，变量intent和serviceIntent声明为类变量或局部变量，例如：

Intent intent, serviceIntent;

另外，请确保您使用的是正确的上下文。在您的情况下，this可能不是您想要的。尝试：

serviceIntent = new Intent(MyActivity.this, myPlayService.class); //OR
serviceIntent = new Intent(getBaseContext(), myPlayService.class); //OR
serviceIntent = new Intent(getApplicationContext(), myPlayService.class);