如何捕获按钮单击而不是原始列表适配器中的活动 [英] How to capture a button click in the original activity instead of the ListAdapter

问题描述

我有一个名为MoviesActivity的活动，该活动使用一个名为MovieAdapter的ListAdapter来显示电影列表.每个列表项都有名称等，以及用户可以单击以播放电影的按钮.我的问题是-如何将与按钮关联的onClick代码从MovieAdapter类转移到MoviesActivity类?

I have an activity called MoviesActivity that uses a ListAdapter called MovieAdapter to display a list of movies. Each list item has name etc., and a button which the user can click to play the movie. My question is - how do I shift the onClick code associated with the button from the MovieAdapter class to the MoviesActivity class?

public class MoviesActivity extends Activity{
    private static final String TAG = "MoviesActivity";
    public ListView listView; 
    public MovieAdapter movieAdapter;
      ...

    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.movies);

      listView = (ListView) findViewById(R.id.MovieListView);
      moviesManager = new MoviesManager(client);
      List<Movie> allMoviesList = moviesManager.getAllMoviesList();      


      movieAdapter = new MovieAdapter((Context)this, allMoviesList,moviesManager);
      listView.setAdapter(movieAdapter);

}

MovieAdapter的代码

The code for MovieAdapter

 public class MovieAdapter extends BaseAdapter implements OnClickListener{
      @Override
      public View getView(int position, View convertView, ViewGroup parent) {
          ...
      }
      @Override
      public void onClick(View v) { 
         //Play movie
          ...
      }
 }

我的MovieAdapter正常运行.我的问题是-我想编写代码以在MoviesActivity中而非MovieAdaptor中播放电影.我怎样才能做到这一点?我曾多次遇到类似的问题，但从未找到一种好的技术(使用静态方法等除外).问题是当我尝试在onClick内发出getWindow()时出现的，因为它不在Activity子类中，所以不会出现.

My MovieAdapter is fully functioning. My question is - I would like to write the code to play the movie in MoviesActivity and not in MovieAdaptor. How can I do that? I have had similar problems many times but never found a good technique (other than using static methods etc.) The problem comes when I try to issue a getWindow() inside onClick - which it wouldn't since its not in a Activity subclass.

推荐答案

不是将Context对象传递到MovieAdapter构造函数中，而是传递MovieActivity对象并运行MovieActivity的playMovie(Movie)按钮的OnClick事件中的方法:

Instead of passing a Context object into your MovieAdapter constructor, pass in the MovieActivity object and run the MovieActivity's playMovie(Movie) method from the button's OnClick event:

您的活动:

public class MoviesActivity extends Activity {
    public ListView listView; 
    public MovieAdapter movieAdapter;

    //...

    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.movies);

       listView = (ListView) findViewById(R.id.MovieListView);
       moviesManager = new MoviesManager(client);
       List<Movie> allMoviesList = moviesManager.getAllMoviesList();      

       movieAdapter = new MovieAdapter(this, allMoviesList, moviesManager);
       listView.setAdapter(movieAdapter);
    }

    public void playMovie(Movie movie) {
        // ...
    }
}

您的适配器:

public class MovieAdapter extends BaseAdapter {
      private MoviesActivity mActivity;
      private List<Movie> mMovies;
      private MoviesManager mClient;

      // ...

      public MovieAdapter(MoviesActivity activity, List<Movie> allMovies, 
              MoviesManager client) {
          mActivity = activity;
          mMovies = allMovies;
          mClient = client;
      }

      @Override
      public View getView(int position, View convertView, ViewGroup parent) {

          final Movie movie = mMovies.get(position);

          // ...

          myButton.setOnClickListener(new OnClickListener() {
              @Override
              public void onClick(View v) { 
                  mActivity.playMovie(movie);
              }
          });
      }
 }

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