如何在旋转后正确恢复视图状态

Question

如何在旋转后正确恢复视图状态

我想手动处理复杂视图的旋转 ,包括恢复支撑位置和大小.在这一刻,我正在尝试这样做onLayout(更好的想法是velcome).有时它运作良好,但通常第一次轮换是错位或没有孩子的视图.

private int oldOrientation = -1;

  /**
   * Override method to configure the dragged view and secondView layout properly.
   */
  @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    Log.e("mylayout", "onLayout " + df.format(new Date(Calendar.getInstance().getTimeInMillis())));
    if (isInEditMode()) {
      super.onLayout(changed, left, top, right, bottom);
    } else {
      dragView.setVisibility(INVISIBLE);
      if (isDragViewAtTop() && (oldOrientation != getResources().getConfiguration().orientation || oldOrientation == -1)) {
        dragView.layout(left, top, right, transformer.getOriginalHeight());
        secondView.layout(left, transformer.getOriginalHeight(), right, bottom);
        ViewHelper.setY(dragView, top);
        ViewHelper.setY(secondView, transformer.getOriginalHeight());
        ViewHelper.setX(dragView, left);
        ViewHelper.setX(secondView, left);
        oldOrientation = getResources().getConfiguration().orientation;
      } else if (isClosedAtLeft() && (
          oldOrientation != getResources().getConfiguration().orientation
              || oldOrientation == -1)) {
        dragView.layout(left, top, right, transformer.getOriginalHeight());
        secondView.layout(left, transformer.getOriginalHeight(), right, bottom);
        ViewHelper.setY(dragView, top);
        ViewHelper.setY(secondView, transformer.getOriginalHeight());
        ViewHelper.setX(dragView, left);
        ViewHelper.setX(secondView, left);
        closeToLeft();
        oldOrientation = getResources().getConfiguration().orientation;
      } else if (isClosedAtRight() && (
          oldOrientation != getResources().getConfiguration().orientation
              || oldOrientation == -1)) {
        dragView.layout(left, top, right, transformer.getOriginalHeight());
        secondView.layout(left, transformer.getOriginalHeight(), right, bottom);
        ViewHelper.setY(dragView, top);
        ViewHelper.setY(secondView, transformer.getOriginalHeight());
        ViewHelper.setX(dragView, left);
        ViewHelper.setX(secondView, left);
        closeToRight();
        oldOrientation = getResources().getConfiguration().orientation;
      } else if ((oldOrientation != getResources().getConfiguration().orientation
          || oldOrientation == -1)) {
        dragView.layout(left, top, right, transformer.getOriginalHeight());
        secondView.layout(left, transformer.getOriginalHeight(), right, bottom);
        ViewHelper.setY(dragView, top);
        ViewHelper.setY(secondView, transformer.getOriginalHeight());
        ViewHelper.setX(dragView, left);
        ViewHelper.setX(secondView, left);
        smoothSlideTo(SLIDE_BOTTOM);
        oldOrientation = getResources().getConfiguration().orientation;
      }
      dragView.setVisibility(VISIBLE);
    }
  }

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在这段代码中,我尝试在旋转后恢复初始stte,当调用onLayout然后将其移动到位时,视图在旋转之前(有4个状态,从creen到左边,从屏幕到右边,scren顶部)或右下角).

编辑:

<?xml version="1.0" encoding="utf-8"?>
<manifest
    package="com.github.pedrovgs.sample"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <uses-sdk android:minSdkVersion="8" />

    <!-- Permissions -->

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <!-- Application configuration -->

    <application
        android:name=".DraggablePanelApplication"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme">

        <!-- Maps API KEY -->

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyC1rMU-mkhoyTvBIdTnYU0dss0tU9vtK48" />

        <!-- Main Activity -->

        <activity
            android:name=".activity.MainActivity"
            android:configChanges="keyboardHidden|orientation|screenSize"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <!-- Places sample -->

        <activity
            android:name=".activity.PlacesSampleActivity"
            android:configChanges="keyboardHidden|orientation|screenSize"

            android:label="@string/places_sample_activity_title" />

        <!-- TV Shows sample -->

        <activity
            android:name=".activity.TvShowsActivity"
            android:label="@string/tv_shows_sample_activity_title" />


        <!-- Youtube Sample -->

        <activity
            android:name=".activity.YoutubeSampleActivity"
            android:configChanges="keyboardHidden|orientation|screenSize"

            android:label="@string/youtube_sample_activity_title" />


        <!-- Video Sample -->

        <activity
            android:name=".activity.VideoSampleActivity"
            android:configChanges="keyboardHidden|orientation|screenSize"

            android:label="@string/video_sample_activity_title" />

        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />

    </application>

</manifest>

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样本活动xml

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:draggable_panel="http://schemas.android.com/apk/res-auto"
    android:id="@+id/fl_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

  <!-- Movie Thumbnail -->

  <ImageView
      android:id="@+id/iv_thumbnail"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      style="@style/image_view"/>

  <!-- DraggablePanel -->

  <com.github.pedrovgs.DraggablePanel
      android:id="@+id/draggable_panel"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      draggable_panel:x_scale_factor="@dimen/x_scale_factor"
      draggable_panel:y_scale_factor="@dimen/y_scale_factor"
      draggable_panel:top_fragment_height="@dimen/top_fragment_height"
      draggable_panel:top_fragment_margin_right="@dimen/top_fragment_margin"
      draggable_panel:top_fragment_margin_bottom="@dimen/top_fragment_margin"
      draggable_panel:enable_horizontal_alpha_effect="false"/>

</FrameLayout>

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Answer 1

Hen*_*nry 1

您扩展了 aViewGroup而不是 a View，但尚未在 xml 或代码中添加任何child内容。DraggableView我在中没有看到任何addChild或任何与子项相关的代码DraggableView。您已经使用过topFragment，bottomFragment等等，并且您曾经addFragmentToView()在ViewGroup. 馊主意！

我知道这很困难而且很耗时。但你需要退一步思考这个视图的设计。我强烈建议您将这些topFragment等视为孩子DraggableView，而不是在FragmentManager其中查看和执行addTransaction。

一旦您开始将片段作为子项添加到您的中ViewGroup，许多并发症就会消失。我这样说是根据我过去的经验。onLayout()是用来排列Child Views里面的ViewGroup。一旦您旋转设备，onLayout()将再次调用并根据您的需要排列子视图。这会很简单。一旦你开始这样概念化，拖动操作就会变得非常简单。

如果您认为作为Framgents孩子在中ViewGroup是荒谬的，请查看此处的ViewPager代码。这使用片段作为输入，但仍将它们视为布局的子级。

尝试处理所有与职位onLayout()本身相关的事情。
不要将位置数据保存在onSaveInstanceState(). 在此仅保存text或数据。drawable
始终建议不要覆盖onCofigurationChanged().

您现在可能无法执行此操作，但从长远来看，您可能希望重构并以这种方式执行此操作。

记住真正的目的onLayout()：

当此视图应为其每个子视图分配大小和位置时从布局中调用。具有子级的派生类应重写此方法并在其每个子级上调用布局。

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