如何跳过活动？安卓

发布于 2024-09-11 20:50:14 字数 406 浏览 7 评论 0原文

我有一个首先启动的默认活动（活动 A），然后用户可以从那里转到另一个活动（活动 B）。在 B 中，经过一些工作后，用户设置了共享首选项。下次应用程序启动时，我想检查 A 是否共享首选项为空，然后转到 B。我将其放在下面

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

，它封装了整个 onCreate。当应用程序启动时，它会跳过 A 并在 B 上显示布局和带有 NullPointerException 的 FC。

有人有这方面的经验吗？

或者

有人对跳过 A 有更好的主意吗？

原文

i have a default activity that starts first (Activity A), and from there the user can go to another activity (Activity B). In B after some work the user sets a sharedpreference. the next time the app starts i want to check in A if sharedpreference is null to go to B. and i put this if just under

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

and it encapsulates the whole onCreate. when the app starts it skips A and on B i shows the layout and the FC with NullPointerException.

Any one got experience with this?

any one got a better idea on skipping A?

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梦里°也失望 2024-09-18 20:50:14

好吧，西蒙，你必须使用共享首选项。将您的数据保存在共享首选项中。然后，在您想要使用共享首选项中的数据的活动中，再次获取相同共享首选项的实例。获取数据并使用它。

通过这段代码

public class Calc extends Activity {
    public static final String PREFS_NAME = "MyPrefsFile";

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

       // Restore preferences
       SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
       boolean silent = settings.getBoolean("silentMode", false);
       setSilent(silent);
    }

    @Override
    protected void onStop(){
       super.onStop();

      // We need an Editor object to make preference changes.
      // All objects are from android.context.Context
      SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
      SharedPreferences.Editor editor = settings.edit();
      editor.putBoolean("silentMode", mSilentMode);

      // Commit the edits!
      editor.commit();
    }
}

你可能会有所了解

Well Simon you have to use Shared prefrences. save your data in shared prefrences. Then in the activity where you want to use the data in Shared prefres again get instance of same shared prefrence. get the data and use it.

go through this code

public class Calc extends Activity {
    public static final String PREFS_NAME = "MyPrefsFile";

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

       // Restore preferences
       SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
       boolean silent = settings.getBoolean("silentMode", false);
       setSilent(silent);
    }

    @Override
    protected void onStop(){
       super.onStop();

      // We need an Editor object to make preference changes.
      // All objects are from android.context.Context
      SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
      SharedPreferences.Editor editor = settings.edit();
      editor.putBoolean("silentMode", mSilentMode);

      // Commit the edits!
      editor.commit();
    }
}

probably you will get an insight

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