Question

这不是＆＃39;如何设置可见性＆＃39;的问题。

我有一个活动1和一个活动2，当我开始活动2时，我在一个监听器中设置了从Gone到Visible的布局并且它有效，我的问题是，当我返回到活动1并返回到活动2时，布局的可见性又恢复了。当我离开时，如何使布局保持可见？

Activity2.java：

@Override
 public void onClick(View v) {

        if (FirstLayout.getVisibility() == View.INVISIBLE) {
            FirstLayout.setVisibility(View.VISIBLE);
         }
}

Activity2.xml：

 <LinearLayout
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:visibility="invisible"
      android:id="@+id/oneLayout"
      android:animateLayoutChanges="true"
      android:orientation="vertical">

      <!-- one Button -->
      <!-- one TextView -->   

  </LinearLayout>

Answer 1

您可以通过以下方法

保存您的上一个州

this.browser.select('select', '223.255.252.246');

并恢复

boolean mState = false;
final String STATE_VISIBILITY = "state-visibility";

// somewhere in the code assign a value to mState 
// i.e. mState = false (if GONE default) and mState = true (if VISIBLE)

@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
    // Save the user's current game state
    savedInstanceState.putBoolean(STATE_VISIBILITY, mState);

    // Always call the superclass so it can save the view hierarchy state
    super.onSaveInstanceState(savedInstanceState);
}

更多关于http://developer.android.com/training/basics/activity-lifecycle/recreating.html

Answer 2

正如上面的评论所述，在你的Activity2.java中：

SharedPreferences sharedPreferences;

并在Activity2的onCreate方法中：

 sharedPreferences=getPreferences(Context.MODE_PRIVATE);
 FirstLayout.setVisibility(sharedPreferences.getBoolean("visibility",false));

然后：

 @Override
    public void onClick(View v) {
    if (FirstLayout.getVisibility() == View.INVISIBLE) {
        FirstLayout.setVisibility(View.VISIBLE);
        SharedPreferences.Editor editor=sharedPreferences.edit();
        editor.putBoolean("visibility",true).commit();
     }
}

Android：如何永久设置可见性

2 个答案: