java - 从卡片滚动器启动单个 Activity 的正确方法

Question

我创建了一个玻璃应用程序，其中有使用 CardScroller 的 CardScrollActivity 并从中导航到其他 Activity ，如下所示:

public class CardScrollActivity extends Activity {

private List<CardBuilder> mCards;
private CardScrollView mCardScrollView;
private ExampleCardScrollAdapter mAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);


    mCardScrollView = new CardScrollView(this);
    mAdapter = new ExampleCardScrollAdapter();
    mCardScrollView.setAdapter(mAdapter);
    mCardScrollView.activate();

    setupClickListener();


    setContentView(mCardScrollView);
}

   private void setupClickListener() {
    // TODO Auto-generated method stub
      mCardScrollView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

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

              log(" onitemclick called "  );

              if(id == 0)
              {
                  log(" onitemclick called and select 1 item "  );

                  Intent myIntent = new Intent(getBaseContext(),
                                            Main2Activity.class);
                  startActivity(myIntent);
              }

              if(id == 1)
              {
                  log(" onitemclick called and select 2 item "  );
                  Intent myIntent = new Intent(getBaseContext(),
                            CompassActivity.class);
                  startActivity(myIntent);
              }

              if(id == 2)
              {
                  log(" onitemclick called and select 3 item "  );
                  Intent myIntent = new Intent(getBaseContext(),
                            GpsActivity.class);
                  startActivity(myIntent);
              }
          }
      });

}

现在，问题是，当我从 Cardscroller 中选择任何项目时，堆栈跟踪显示启动 Activity 多次而不是一次，为什么它选择多次，请帮忙？

Answer 1

老实说，如果您不提供 LogCat 错误，我无能为力。

我唯一能说的是，也许您可​​以尝试完成当前的 Activity ，以确保在启动新 Activity 后它不会做任何奇怪的事情。为此，您需要将标志 FLAG_ACTIVITY_CLEAR_TOP 添加到您的 Intent，然后在启动 Intent 后立即调用 finish()。

对于一个 Intent 调用，它看起来像这样:

Intent intent = new Intent(this, NewActivity.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish(); 

这是适合您的实现:

if(id == 0) {
    log(" onitemclick called and select 1 item "  );
    Intent intent = new Intent(getBaseContext(), Main2Activity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    startActivity(intent);
    finish(); 
} else if(id == 1) {
    log(" onitemclick called and select 2 item "  );
    Intent intent = new Intent(getBaseContext(), CompassActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    startActivity(intent);
    finish(); 
} else if(id == 2) {
    log(" onitemclick called and select 3 item "  );
    Intent intent = new Intent(getBaseContext(), GpsActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    startActivity(intent);
    finish(); 
}