Question

我收到了关于

的错误

setListAdapter(new ArrayAdapter<String>(this,     android.R.layout.simple_list_item_1,ACTIVITY_CHOICES));
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
getListView().setTextFilterEnabled(true);

我刚学会在android上开发。

     public class MainActivity extends Activity {

        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            final String[] ACTIVITY_CHOICES = new String[] {getString(R.string.menu_new_game),getString(R.string.menu_prefs)};

            setContentView(R.layout.activity_main);
            setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,ACTIVITY_CHOICES));
            getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
            getListView().setTextFilterEnabled(true);
        }
        OnItemClickListener myOnItemClickListener = new OnItemClickListener() {
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3){

            switch(arg2)
                   {
                     case 0:
                     startGame();
                     break;
                     case 1:
                     startPrefs();
                     break;
                     default: break;
              }
        }getListView().setOnItemClickListener(myOnItemClickListener);   
      };      

      private void startGame() {
        SharedPreferences settings = getSharedPreferences("memoryPrefs", 0);
        SharedPreferences.Editor prefeditor = settings.edit();
        prefeditor.putBoolean("new_game", true);
        prefeditor.putInt("score", 100);
        prefeditor.commit();
        Intent launchGame = new Intent(this, PlayGame.class);
        startActivity(launchGame);
    }

    private void startPrefs() {
          Intent launchPrefs = new Intent(this, SettingScreen.class);
          startActivity(launchPrefs);
        }


   @Override
   protected void onPause() {
    super.onPause();        
    SharedPreferences settings = getSharedPreferences("memoryPrefs", 0);
    SharedPreferences.Editor prefeditor = settings.edit();
    prefeditor.putString("previous_screen", "MenuScreen");
    prefeditor.commit();
        }

    }

Answer 1

您需要扩展ListActivity。

setListAdapter是LisActivtiy的方法。

更改此

public class MainActivity extends Activity {

到

public class MainActivity extends ListActivity {

还有以下

 getListView().setOnItemClickListener(myOnItemClickListener);

应为onCreate

http://developer.android.com/reference/android/app/ListActivity.html

ListActivity具有默认布局，该布局由屏幕中央的单个全屏列表组成。但是，如果需要，可以通过在onCreate（）中使用setContentView（）设置自己的视图布局来自定义屏幕布局。要做到这一点，你自己的视图必须包含一个ID为“@android：id / list”的ListView对象（如果它在代码中则列出）

因此，如果您需要xml中的其他视图，则需要

<ListView android:id="@android:id/list" // in your layout xml

如果您不想要其他任何视图，请删除setContentView(R.layout.activity_main)

或者你需要在xml中拥有ListView。初始化listview并使用

listview.setAdapter(adapter);

编辑：

public class MainActivity extends ListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final String[] ACTIVITY_CHOICES = new String[] {getString(R.string.menu_new_game),getString(R.string.menu_prefs)};
        setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,ACTIVITY_CHOICES));
        getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        getListView().setTextFilterEnabled(true);
        getListView().setOnItemClickListener(myOnItemClickListener);
    }
    OnItemClickListener myOnItemClickListener = new OnItemClickListener() {
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3){

        switch(arg2)
               {
                 case 0:
                 startGame();
                 break;
                 case 1:
                 startPrefs();
                 break;
                 default: break;
          }
    }   
  };      

  private void startGame() {
    SharedPreferences settings = getSharedPreferences("memoryPrefs", 0);
    SharedPreferences.Editor prefeditor = settings.edit();
    prefeditor.putBoolean("new_game", true);
    prefeditor.putInt("score", 100);
    prefeditor.commit();
    Intent launchGame = new Intent(this, PlayGame.class);
    startActivity(launchGame);
}

private void startPrefs() {
      Intent launchPrefs = new Intent(this, SettingScreen.class);
      startActivity(launchPrefs);
    }


@Override
protected void onPause() {
super.onPause();        
SharedPreferences settings = getSharedPreferences("memoryPrefs", 0);
SharedPreferences.Editor prefeditor = settings.edit();
prefeditor.putString("previous_screen", "MenuScreen");
prefeditor.commit();
    }
}

Answer 2

请将您的行更改为如下所示，并查看是否有任何错误并扩展到ListActivity

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
    final String[] ACTIVITY_CHOICES = new String[] {getString(R.string.menu_new_game),getString(R.string.menu_prefs)};

Answer 3

公共类MainActivity扩展 ListActivity
在activity_main.xml文件中将listview id添加为 android：id =“@ android：id / list”

setListAdapter和getListview出错

3 个答案: