使用软键盘时不隐藏字段的Android底部操作栏

Question

我使用以下方式禁用了正常的顶部操作栏:

<style name="AppTheme" parent="android:Theme.Holo.Light.DarkActionBar">

& 我想使用底部操作栏来完成/取消操作，例如这个日历应用程序:

但是当我尝试向 scrollView 中可用的 editTexts 写入内容时，底部操作栏隐藏了字段，并且我希望它像下面的日历应用程序一样可见:

那么，我怎样才能实现类似的行为呢？(这样底部操作栏在打开软键盘时就不会隐藏任何字段)，

我正在使用这样的代码:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:baselineAligned="true"
android:orientation="vertical"
android:weightSum="1">

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:fillViewport="false"
    android:id="@+id/formScrollView">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <!-- all form fields goes here -->
    </LinearLayout>

</ScrollView>

<FrameLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@android:color/white"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:padding="@dimen/done_button_padding"
    android:id="@+id/happeningDoneLayout">

    <Button
        android:id="@+id/doneButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:text="@string/done"
        android:layout_alignParentBottom="true"/>
    <Button
        android:id="@+id/cancelButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:text="@string/cancel"
        android:layout_alignParentBottom="true"/>
</FrameLayout>

</RelativeLayout>

Answer 1

最简单的做法是防止在虚拟键盘出现时调整布局大小:

    <activity
        android:name=".ShareFromDriveActivity_"
        android:hardwareAccelerated="true"
        android:label="@string/titleSharingCalendar"
        android:launchMode="standard"
        android:parentActivityName=".AppWidgetConfigure_"
        android:screenOrientation="sensor"
        android:theme="@style/Theme.Materialamberpurple"
        android:windowSoftInputMode="stateHidden|adjustPan" >
        <intent-filter>
            <action android:name="de.kashban.android.picturecalendar.INTENT_ACTION_SHARE_FROM_DRIVE" />
        </intent-filter>
    </activity>

重要的一行是android:windowSoftInputMode="stateHidden|adjustPan"。 stateHidden 确保在启动 Activity 时键盘不会打开，即使 EditText 具有焦点也是如此。

adjustPan 是您正在寻找的:布局将不再调整大小(包括下方按钮)，但键盘将覆盖布局。仍然可以将它们滚动到可见部分，但是当键盘出现时，它们不可见。

来源:Android Guides

也许仅此设置就可以帮助您解决问题。

如果这还不够并且您需要按钮真正消失，请尝试使用此方法:

// Detect soft keyboard visibility changes
final SoftKeyboardStateHelper softKeyboardStateHelper = 
        new SoftKeyboardStateHelper(lyt_share_from_drive_main);
softKeyboardStateHelper.addSoftKeyboardStateListener(this);

SoftKeyboardStateHelper 是 Artem Zinnatullin 的一个类，用于检测软键盘的状态变化:

/**
 * 
 */
package de.kashban.android.picturecalendar.util.local;

/**
 * @author Artem Zinnatullin
 * http://stackoverflow.com/questions/2150078/how-to-check-visibility-of-software-keyboard-in-android/9108219#9108219
 * Usage: final SoftKeyboardStateHelper softKeyboardStateHelper = new SoftKeyboardStateHelper(findViewById(R.id.activity_main_layout);
 *        softKeyboardStateHelper.addSoftKeyboardStateListener(...);
 */
import android.graphics.Rect;
import android.view.View;
import android.view.ViewTreeObserver;

import java.util.LinkedList;
import java.util.List;

public class SoftKeyboardStateHelper implements ViewTreeObserver.OnGlobalLayoutListener {

    public interface SoftKeyboardStateListener {
        void onSoftKeyboardOpened(int keyboardHeightInPx);
        void onSoftKeyboardClosed();
    }

    private final List<SoftKeyboardStateListener> listeners = new LinkedList<SoftKeyboardStateListener>();
    private final View activityRootView;
    private int        lastSoftKeyboardHeightInPx;
    private boolean    isSoftKeyboardOpened;

    public SoftKeyboardStateHelper(View activityRootView) {
        this(activityRootView, false);
    }

    public SoftKeyboardStateHelper(View activityRootView, boolean isSoftKeyboardOpened) {
        this.activityRootView     = activityRootView;
        this.isSoftKeyboardOpened = isSoftKeyboardOpened;
        activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(this);
    }

    @Override
    public void onGlobalLayout() {
        final Rect r = new Rect();
        //r will be populated with the coordinates of your view that area still visible.
        activityRootView.getWindowVisibleDisplayFrame(r);

        final int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
        if (!isSoftKeyboardOpened && heightDiff > 100) { // if more than 100 pixels, its probably a keyboard...
            isSoftKeyboardOpened = true;
            notifyOnSoftKeyboardOpened(heightDiff);
        } else if (isSoftKeyboardOpened && heightDiff < 100) {
            isSoftKeyboardOpened = false;
            notifyOnSoftKeyboardClosed();
        }
    }

    public void setIsSoftKeyboardOpened(boolean isSoftKeyboardOpened) {
        this.isSoftKeyboardOpened = isSoftKeyboardOpened;
    }

    public boolean isSoftKeyboardOpened() {
        return isSoftKeyboardOpened;
    }

    /**
     * Default value is zero (0)
     * @return last saved keyboard height in px
     */
    public int getLastSoftKeyboardHeightInPx() {
        return lastSoftKeyboardHeightInPx;
    }

    public void addSoftKeyboardStateListener(SoftKeyboardStateListener listener) {
        listeners.add(listener);
    }

    public void removeSoftKeyboardStateListener(SoftKeyboardStateListener listener) {
        listeners.remove(listener);
    }

    private void notifyOnSoftKeyboardOpened(int keyboardHeightInPx) {
        this.lastSoftKeyboardHeightInPx = keyboardHeightInPx;

        for (SoftKeyboardStateListener listener : listeners) {
            if (listener != null) {
                listener.onSoftKeyboardOpened(keyboardHeightInPx);
            }
        }
    }

    private void notifyOnSoftKeyboardClosed() {
        for (SoftKeyboardStateListener listener : listeners) {
            if (listener != null) {
                listener.onSoftKeyboardClosed();
            }
        }
    }
}

在您的 Activity 中实现接口(interface) SoftKeyboardStateListener 并覆盖这些方法:

@Override
public void onSoftKeyboardOpened(int keyboardHeightInPx) {
    if (D.DEBUG_APP) Log.d(TAG, "onSoftKeyboardOpened() called with keyboard height " + keyboardHeightInPx);
    rdgVisibility.setVisibility(View.GONE);
    if (tvPermissionLabel != null)
        tvPermissionLabel.setVisibility(View.GONE);
    lyt_ShareDriveOkCancel.setVisibility(View.GONE);
    cbShareWithDev.setVisibility(View.GONE);

}

@Override
public void onSoftKeyboardClosed() {
    if (D.DEBUG_APP) Log.d(TAG, "onSoftKeyboardClosed() called.");
    rdgVisibility.setVisibility(View.VISIBLE);
    if (tvPermissionLabel != null)
        tvPermissionLabel.setVisibility(View.VISIBLE);
    lyt_ShareDriveOkCancel.setVisibility(View.VISIBLE);
    cbShareWithDev.setVisibility(View.VISIBLE);
}

在这两种方法中，相应地更改下方按钮的可见性。完成。

这是它在我的应用中的样子:

键盘关闭，完整布局可见

键盘已打开，除 EditText 外的所有控件都消失了。原因是 EditText 可能跨越多行，在小屏幕上，完整布局太杂乱了。