Question

正如标题所说，情景是：第一次使用应用程序时，显示屏幕A. 完成屏幕A后，按钮将显示屏幕B. 从现在开始，永远，当您启动应用程序时，屏幕B将始终是主屏幕（活动？）。我正在尝试这2天，我无法得到它。有人请详细解释，甚至更好地给我一个code.rar所以我可以研究它。我为此疯狂了!!!

Answer 1

所有你必须像这样检查

 SharedPreferences prefs = getSharedPreferences("mySHaredpref", Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();
    boolean isFirst = prefs.getBoolean("isfirstTime", true);
    if(isFirst) {
        Intent intent = new Intent(this, ActivtyA.class);
        editor.putBoolean(KEY_IS_FIRST_TIME, false);
        editor.commit();
        startActivity(intent);
    }
    else{
      Intent intent = new Intent(this, MainActivty.class);
      startActivity(intent);
    }

Answer 2

只需将您的活动A声明为AndroidManifest.xml中的启动器活动，然后在您的活动A onCreate（）内，您就可以执行此操作

private SharedPreferences mSharedPreferences;
private Editor mEditor;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_a);

    mSharedPreferences = getSharedPreferences("yourPrefsFileName", Context.MODE_PRIVATE));
    mEditor = mSharedPreferences.edit();

    if (mSharedPreferences.getBoolean("isfirstTime", true)) {
        mEditor.putBoolean("isFirstTime",false);
        mEditor.apply();
    }else{
         startActivity(new Intent(this, ActivityB.class));
         overridePendingTransition(0, 0);
         finish();
      }
}

Answer 3

public class FirstActivity extends Activity {

   public void onCreate(Bundle saved){
      super.onCreate();

      SharedPreferences prefs = getSharedPreferences("MyPrefs", Context.MODE_PRIVATE);

     if (!prefs.getBoolean("firstStart", true)){
          startActivity(this, SecondActivity.class);
          finish(); // Finish the current one, is like forwarding directly to the second one
      }

   }
}

每当您完成显示第一个活动时，将共享prefs boolean标志设置为false：

prefs.getEditor.setBoolean("firstStart", false).commit();

Answer 4

SharedPreferences sp = getSharedPreferences("checking",MODE_PRIVATE);

String data = sp.getString("check", "");

if (data.equals("success")) {

//one time proccess code

//with follow code

SharedPreferences sp= getSharedPreferences("checking",MODE_PRIVATE);

Editor e1 = sp.edit();

e1.putString("check","success");

e1.commit();


} else {

// code for main

 Intent intent = new Intent(this, MainActivty.class);
 startActivity(intent);

}

仅运行一次活动，然后始终运行主活动

4 个答案: