保存Android的setOnItemClickListener数据

我创建了一个列表视图，允许用户勾选他们已经看到的列表中的电影。唯一的问题是，当我更改活动或关闭应用程序时，它会将列表视图中的所有元素重置为默认值。我想知道是否有一种方法可以使用我当前的代码保存这些更改。保存Android的setOnItemClickListener数据

public class Movies extends AppCompatActivity { 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_movies); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    ListView moviesListView = (ListView)findViewById(R.id.moviesListView); 

    final ArrayList<String> topMovies = new ArrayList<String>(asList("The Shawshank Redemption", "The Godfather", "The Godfather: Part 2", 
      "The Dark Knight", "Pulp Fiction","Schlinder's List","12 Angry Men","The Lord of the Rings: The Return of the King", 
      "The Good, the Bad and the Ugly","Fight Club","The Lord of the Rings: The Fellowship of the Ring","Star Wars: Episode V - The Empire Strikes Back", 
      "Forrest Gump","Inception","One Flew Over the Cuckoo's Nest","The Lord of the Rings: The Two Towers","Goodfellas", 
      "The Matrix","Seven Samurai","Star Wars: Episode IV - A New Hope","City of God","Se7en","The Silence of the Lambs", 
      "The Usual Suspects","It's a Wonderful Life","Life is Beautiful","Leon: The Professional","Once Upon a Time in the West", 
      "Spirited Away","Interstellar","Saving Private Ryan","Casablanca","American History X","Psycho","City Lights","Raiders of the Lost Ark", 
      "Rear Window","The Intouchables","Modern Times","The Green Mile","Terminator 2: Judgement Day","The Pianist","The Departed", 
      "Whiplash","Back to the Future","Memento","Gladiator","Apocolypse Now","Dr. Strangelove","The Prestige")); 

    ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, topMovies); 

    moviesListView.setAdapter(arrayAdapter); 

    final MediaPlayer mPlayer = MediaPlayer.create(this,R.raw.pindrop); 

    moviesListView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 

      if(view.getAlpha()==1f) { 

       mPlayer.start(); 
       Toast.makeText(getApplicationContext(), "You Watched " + topMovies.get(position), Toast.LENGTH_LONG).show(); 
       view.animate().alpha(0.2f); 
      } 

      else{ 

       view.animate().alpha(1f); 

      } 
     } 
    }); 
} 

}

来源

2016-02-09 BelovedAunt

您需要保存某些地方（通常在数据库中）这些更改以跟踪电影是否标记为已显示或未显示。 – kevinkl3

在Android上保存数据最简单的方法是使用SharedPreferences。但是如果你有关于数据库的一些知识，你可以使用SQLite。这里有一些链接，让你开始：http://stackoverflow.com/questions/3624280/how-to-use-sharedpreferences-in-android-to-store-fetch-and-edit-values http：// www.androidhive.info/2011/11/android-sqlite-database-tutorial/ –

谢谢你们。共享首选项能够保存列表视图中的所有50行吗？ – BelovedAunt

是你的电影的ArrayList会改变还是静态？如果列表更改或删除列表项，会发生什么情况。在Android开发培训中，共享偏好中的元素过多被忽视。 SQLite3数据库将是最好的方法。

来源

2016-02-09 23:53:44 MrMagoo

谢谢。这一切都将保持不变。考虑到元素中唯一改变的是alpha，是否可以在SQLlite中存储这些更改？ – BelovedAunt

是的，定义一个包含要存储信息的列的表相当容易。从该表格中读取也很容易。 – MrMagoo

保存Android的setOnItemClickListener数据

回答

相关问题