隐藏statusBar时如何强制windowSoftInputMode adjustResize

Question

我一直在努力让它发挥作用。只要我保持状态栏可见，应用程序就会调整大小。根据此 post 这是一个 android 错误，但问题已关闭但未解决。

从我读到的所有内容来看，使用 Insets 应该可以解决问题，但我无法将其付诸实践。不确定是否应该走这条路。

在此之后我将以下代码添加到 OnCreate。

ViewCompat.setOnApplyWindowInsetsListener(getWindow().getDecorView().getRootView(), new OnApplyWindowInsetsListener() {
    @Override
    public WindowInsetsCompat onApplyWindowInsets(View view, WindowInsetsCompat insets) {

        ((ViewGroup.MarginLayoutParams) view.getLayoutParams()).topMargin =
            insets.getSystemWindowInsetTop();

        return insets.consumeSystemWindowInsets();
   }   
});

抛出异常：

java.lang.ClassCastException: android.view.WindowManager$LayoutParams cannot be cast to android.view.ViewGroup$MarginLayoutParams

post 继续，但我被困在这里并且怀疑我是否走对了路。

下面是我正在使用的测试代码，如果有人想尝试的话。在通过向 AppTheme 添加 <item name="android:windowFullscreen">true</item> 删除状态栏之前，效果很好。

AndroidManifest.xml:

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

    <activity android:name=".MainActivity"
        android:windowSoftInputMode="adjustResize"> 
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

activity_mail.xml:

<!-- this control should be position static -->
    <TextView
        android:layout_height="50dp"
        android:layout_width="fill_parent"
        android:background="@color/colorPrimaryDark"
        android:text="static window at top"
        android:gravity="center"
        />

<!-- the resizable view  -->
<android.support.v7.widget.RecyclerView
    android:id="@+id/my_list"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:transcriptMode="normal">
</android.support.v7.widget.RecyclerView>

<!-- use this EditText box to call softKeyboard-->
<android.support.v7.widget.AppCompatEditText
    android:id="@+id/cv_bottom_bar_edit"
    style="@style/Widget.AppCompat.AutoCompleteTextView"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:textSize="18sp"
    android:background="@color/colorPrimaryDark"
    android:gravity="center"
    />

row.xml:

<?xml version="1.0" encoding="utf-8"?>
<TextView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#F06060"
    android:layout_margin="30dp"
    android:padding="5dp"
    android:textSize="25sp"
    android:gravity="center"
>

MainActivity.java:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mRecyclerView = findViewById(R.id.my_list);
    mRecyclerView.setHasFixedSize(true);

    mLayoutManager = new LinearLayoutManager(this);
    mRecyclerView.setLayoutManager(mLayoutManager);

    String[] myDataset = new String[]{"1", "2", "3","4","5","6","7","8","9"};

    mAdapter = new MyAdapter(myDataset);
    mRecyclerView.setAdapter(mAdapter);

}

更新： 我将 windowFullscreen 属性从清单移到了 AppTheme，因为 Android 没有从清单中读取它。

Answer 1

注意这一行：

((ViewGroup.MarginLayoutParams) view.getLayoutParams()).topMargin =
            insets.getSystemWindowInsetTop();//what's the parent of "view"

按照getLayoutParams的说法，你应该知道"view"的父级是什么，比如父级是FrameLayout，那么就这样做：

((FrameLayout.LayoutParams) view.getLayoutParams()).topMargin =
                insets.getSystemWindowInsetTop();

如果parent是relativelayout或者linearlayout，也像上面那样切换到definite type。

编辑：试试这个：

((WindowManager.LayoutParams) view.getLayoutParams()).topMargin =
                    insets.getSystemWindowInsetTop();

Answer 2

public class AndroidBug5497Workaround extends AppCompatActivity {

// For more information, see https://issuetracker.google.com/issues/36911528
// To use this class, simply invoke assistActivity() on an Activity that already has its content view set.

private ViewGroup contentContainer;
private ViewTreeObserver viewTreeObserver;
private Rect contentAreaOfWindowBounds = new Rect();
private LinearLayout.LayoutParams rootViewLayout; //-->change to the view root control type of your view.
private int usableHeightPrevious = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    contentContainer = findViewById(android.R.id.content);
    rootViewLayout = (LinearLayout.LayoutParams) contentContainer.getLayoutParams();
}

@Override
protected void onPause() {
    super.onPause();
    if (viewTreeObserver.isAlive()) {

        viewTreeObserver.removeOnGlobalLayoutListener(listener);
    }
}

@Override
protected void onResume() {
    super.onResume();
    if (viewTreeObserver == null || !viewTreeObserver.isAlive()) {
        viewTreeObserver = contentContainer.getViewTreeObserver();
    }

    viewTreeObserver.addOnGlobalLayoutListener(listener);
}

@Override
protected void onDestroy() {
    super.onDestroy();
    contentContainer = null;
    viewTreeObserver = null;
}

ViewTreeObserver.OnGlobalLayoutListener listener = new ViewTreeObserver.OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        contentContainer.getWindowVisibleDisplayFrame(contentAreaOfWindowBounds);
        int usableHeightNow = contentAreaOfWindowBounds.height();

        if (usableHeightNow != usableHeightPrevious) {
            rootViewLayout.height = usableHeightNow;
            contentContainer.layout(contentAreaOfWindowBounds.left, contentAreaOfWindowBounds.top, contentAreaOfWindowBounds.right, contentAreaOfWindowBounds.bottom);
            contentContainer.requestLayout();

            usableHeightPrevious = usableHeightNow;
        }
    }
};

}

从 github 的 facebook/react-native 问题中获得。稍微简化了一个常见的 activity。来自 api 21 的纵向和横向效果很好，但它没有比这更多的测试。小心使用。

隐藏statusBar时如何强制windowSoftInputMode adjustResize

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