使用自定义上下文操作栏进行WebView文本选择

Question

我使用了Google和本教程中的指南来制作我自己的上下文操作栏.

private ActionMode.Callback mActionModeCallback = new ActionMode.Callback() {

    // Called when the action mode is created; startActionMode() was called
    @Override
    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        // Inflate a menu resource providing context menu items
        MenuInflater inflater = mode.getMenuInflater();
        inflater.inflate(R.menu.annotation_menu, menu);
        return true;
    }

    // Called each time the action mode is shown.
    // Always called after onCreateActionMode, but
    // may be called multiple times if the mode is invalidated.
    @Override
    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        return false; // Return false if nothing is done
    }

    // Called when the user selects a contextual menu item
    @Override
    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        switch (item.getItemId()) {
            case R.id.custom_button:
                // do some stuff
                break;
            case R.id.custom_button2:
                // do some other stuff
                break;
            default:
                // This essentially acts as a catch statement
                // If none of the other cases are true, return false
                // because the action was not handled
                return false;
        }
        finish(); // An action was handled, so close the CAB
        return true;
    }

    // Called when the user exits the action mode
    @Override
    public void onDestroyActionMode(ActionMode mode) {
        mActionMode = null;
    }
};

此菜单旨在在用户选择文本时显示,因此它将覆盖本机复制/粘贴菜单.现在我谈到我的问题.

因为我正在覆盖文本选择的功能,所以我还添加了LongClickListener一个WebView并实现了该onLongClick(View v)方法,以便我可以检测用户何时进行选择.

    myWebView.setOnLongClickListener(new View.OnLongClickListener() {

        @Override
        public boolean onLongClick(View v) {
            if (mActionMode != null) {
                return false;
            }

            mActionMode = startActionMode(mActionModeCallback);
            v.setSelected(true);
            return true;
        }
    });

当我长按,我看到我的自定义菜单出现,但没有突出显示文本.
我需要有文本选择功能; 没有它,我的菜单毫无意义.

如何覆盖onLongClick(View v),但保持Android提供的文本选择？
如果无法做到这一点,我是否可以拨打startActionMode(mActionModeCallback)其他地方的电话,以便正常选择文字,但我的自定义菜单也会出现？
如果这些都不可能......帮助.

Answer 1

有一个更容易的方式!请参阅以下更新:D

为了完整起见,我就是这样解决问题的方法:

我根据这个答案遵循了这个建议,稍加调整以更接近地匹配被覆盖的代码:

public class MyWebView extends WebView {

    private ActionMode mActionMode;
    private mActionMode.Callback mActionModeCallback;

    @Override
    public ActionMode startActionMode(Callback callback) {
        ViewParent parent = getParent();
        if (parent == null) {
            return null;
        }
        mActionModeCallback = new CustomActionModeCallback();
        return parent.startActionModeForChild(this, mActionModeCallback);
    }
}

从本质上讲,这会强制您的自定义CAB显示而不是Android CAB.现在你必须修改你的回调,以便文本高亮显示将与CAB一起消失:

public class MyWebView extends WebView {
    ...
    private class CustomActionModeCallback implements ActionMode.Callback {
        ...
        // Everything up to this point is the same as in the question

        // Called when the user exits the action mode
        @Override
        public void onDestroyActionMode(ActionMode mode) {
            clearFocus(); // This is the new code to remove the text highlight
             mActionMode = null;
        }
    }
}

这里的所有都是它的.请注意,只要您使用MyWebView被覆盖的内容startActionMode,就无法获得本机CAB(复制/粘贴菜单,如果是WebView).有可能实现这种行为,但这不是这段代码的工作方式.

更新:有一个更简单的方法来做到这一点!上述解决方案效果很好,但这是另一种更简单的方法.

该解决方案提供的控制较少ActionMode,但它需要的代码远少于上述解决方案.

public class MyActivity extends Activity {

    private ActionMode mActionMode = null;

    @Override
    public void onActionModeStarted(ActionMode mode) {
        if (mActionMode == null) {
            mActionMode = mode;
            Menu menu = mode.getMenu();
            // Remove the default menu items (select all, copy, paste, search)
            menu.clear();

            // If you want to keep any of the defaults,
            // remove the items you don't want individually:
            // menu.removeItem(android.R.id.[id_of_item_to_remove])

            // Inflate your own menu items
            mode.getMenuInflater().inflate(R.menu.my_custom_menu, menu);
        }

        super.onActionModeStarted(mode);
    }

    // This method is what you should set as your item's onClick
    // <item android:onClick="onContextualMenuItemClicked" />
    public void onContextualMenuItemClicked(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.example_item_1:
                // do some stuff
                break;
            case R.id.example_item_2:
                // do some different stuff
                break;
            default:
                // ...
                break;
        }

        // This will likely always be true, but check it anyway, just in case
        if (mActionMode != null) {
            mActionMode.finish();
        }
    }

    @Override
    public void onActionModeFinished(ActionMode mode) {
        mActionMode = null;
        super.onActionModeFinished(mode);
    }
}

这是一个示例菜单,可以帮助您入门:

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

<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/example_item_1"
        android:icon="@drawable/ic_menu_example_1"
        android:showAsAction="always"
        android:onClick="onContextualMenuItemClicked"
        android:title="@string/example_1">
    </item>

    <item
        android:id="@+id/example_item_2"
        android:icon="@drawable/ic_menu_example_2"
        android:showAsAction="ifRoom"
        android:onClick="onContextualMenuItemClicked"
        android:title="@string/example_2">
    </item>

</menu>

而已!你完成了!现在您的自定义菜单将显示,您不必担心选择,您几乎不必关心ActionMode生命周期.

这几乎完美无缺地WebView占据了整个父母Activity.如果View你Activity的同时有多个s,我不确定它会有多好用.在这种情况下,可能需要进行一些调整.