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天天快消息！Android 软键盘丝滑切换(一)

来源：博客园

在开发app中，软键盘弹出会有卡顿，闪一下的现象，会影响体验效果。为了实现微信软键盘与表情面板流畅的切换效果，查看了好多例子，查阅的很多资料，换了几种实现方式，都达不到流畅切换的效果，最终结合资料，参考网上的很多例子实现了想要的效果。（由于Demo中代码部分为Java代码，所以文中代码也由Kotlin与Java组成）Demo地址：https://github.com/xiaoyu00/KeyboardDemo


(资料图)

效果图

实现思路

在manifest android:windowSoftInputMode属性提供了系统自带的键盘弹出界面变化的几种方式，但都达不到流畅切换效果，更别说更复杂的微信键盘切换了，所以我们不用系统的方式，自己实现。首先要实时获取到软键盘弹出时的属性：是否弹出，动画执行过程，高度等；然后在界面加载完成后计算带表情面板布局的高度；最后围绕键盘弹出收回的过程中，在键盘属性变化时对整个布局做平移处理。

实现

一、键盘监听

键盘的变化监听是整个实现的核心，Android手机的键盘所有属性是直接获取不到的。监听键盘变化只能用其它方式，网上有几种方方法，我这选择的是根view Insets监听方式（实现OnApplyWindowInsetsListener接口，设置ViewCompat.setWindowInsetsAnimationCallback）。

1.自定义RootViewDeferringInsetsCallback继承WindowInsetsAnimationCompat.Callback实现OnApplyWindowInsetsListener接口

public class RootViewDeferringInsetsCallback extends WindowInsetsAnimationCompat.Callback implements OnApplyWindowInsetsListener {
private View view;　　private WindowInsetsCompat lastWindowInsets;　　private boolean deferredInsets = false;　　private int persistentInsetTypes;　　private int deferredInsetTypes;　　private boolean isPadding = false;
...//构造方法
@Override　　public WindowInsetsCompat onApplyWindowInsets(View v, WindowInsetsCompat windowInsets) {   　　 view = v;   　　 lastWindowInsets = windowInsets;   　　 if (isPadding) {        　　int types;       　　 if (deferredInsets) {            　　types = deferredInsetTypes;       　　 } else {            　　types = persistentInsetTypes | deferredInsetTypes;        　　}        　　Insets typeInsets = windowInsets.getInsets(types);        　　v.setPadding(typeInsets.left, typeInsets.top, typeInsets.right, typeInsets.bottom);   　　 }    　　return WindowInsetsCompat.CONSUMED;　　}
@Override　　public void onPrepare(@NonNull WindowInsetsAnimationCompat animation) {    　　if ((animation.getTypeMask() & deferredInsetTypes) != 0) {       　　 deferredInsets = true;    　　}　　}
@NonNull　　@Override　　public WindowInsetsCompat onProgress(@NonNull WindowInsetsCompat insets, @NonNull List runningAnimations) {   　　 return insets;　　}
@Override　　public void onEnd(@NonNull WindowInsetsAnimationCompat animation) {    　　if (deferredInsets && (animation.getTypeMask() & deferredInsetTypes) != 0) {        　　deferredInsets = false;       　　 if (lastWindowInsets != null && view != null) {           　　 ViewCompat.dispatchApplyWindowInsets(view, lastWindowInsets);       　　 }   　　 }　　}
}

2.定义KeyBoardListener接口

public interface KeyBoardListener {    void onAnimStart(int moveDistance);    void onAnimDoing(int offsetX,int offsetY);    void onAnimEnd();}

3.自定义KeyBoardInsetsCallBack继承RootViewDeferringInsetsCallback

public class KeyBoardInsetsCallBack extends RootViewDeferringInsetsCallback {    public static final int KEYBOARD_TYPE = WindowInsetsCompat.Type.ime();    public static final int SYSTEM_BAR_TYPE = WindowInsetsCompat.Type.systemBars();    private KeyBoardListener keyboardListener;    public KeyBoardInsetsCallBack(int dispatchMode, KeyBoardListener keyboardListener) {        super(dispatchMode);        this.keyboardListener = keyboardListener;    }    public KeyBoardInsetsCallBack(KeyBoardListener keyboardListener) {        this(DISPATCH_MODE_STOP, keyboardListener);    }    @NonNull    @Override    public WindowInsetsAnimationCompat.BoundsCompat onStart(@NonNull WindowInsetsAnimationCompat animation, @NonNull WindowInsetsAnimationCompat.BoundsCompat bounds) {        keyboardListener.onAnimStart(bounds.getUpperBound().bottom - bounds.getLowerBound().bottom);//计算键盘弹出高度        return super.onStart(animation, bounds);    }    @NonNull    @Override    public WindowInsetsCompat onProgress(@NonNull WindowInsetsCompat insets, @NonNull List runningAnimations) {        Insets typesInset = insets.getInsets(KEYBOARD_TYPE);        Insets otherInset = insets.getInsets(SYSTEM_BAR_TYPE);        Insets subtract = Insets.subtract(typesInset, otherInset);        Insets diff = Insets.max(subtract, Insets.NONE);        keyboardListener.onAnimDoing(diff.left - diff.right, diff.top - diff.bottom);        return insets;    }    @Override    public void onEnd(@NonNull WindowInsetsAnimationCompat animation) {        keyboardListener.onAnimEnd();    }}

4.最后在Activity中界面加载完成后添加键盘监听

val keyBoardInsetsCallBack =KeyBoardInsetsCallBack(object :                KeyBoardListener {                override fun onAnimStart(moveDistance: Int) {                    ...                }                override fun onAnimDoing(offsetX: Int, offsetY: Int) {                   ...                }                override fun onAnimEnd() {                   ...                }     }) ViewCompat.setWindowInsetsAnimationCallback(window.decorView, keyBoardInsetsCallBack)

这样就完成了键盘弹出收回过程的监听。

二、计算并设置View大小

在界面加载完成后计算View高度，contentLayout为根Layout

contentLayout.viewTreeObserver            .addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {                override fun onGlobalLayout() {                    contentLayout.viewTreeObserver.removeOnGlobalLayoutListener(this)                    calculationLayoutSize()                    initKeyBoardListener()                }            })
private fun calculationLayoutSize() {        val layoutParams = contentLayout.layoutParams as FrameLayout.LayoutParams        val layoutParams2 = listLayout.layoutParams as LinearLayout.LayoutParams        val cHeight: Int = contentLayout.height        PANEL_HEIGHT=(cHeight*0.45).toInt()//PANEL_HEIGHT为表情面板高度        layoutParams2.height = cHeight        listLayout.layoutParams = layoutParams2//listlayout为表情面板上面内容layout        layoutParams.height = cHeight + PANEL_HEIGHT        contentLayout.layoutParams = layoutParams    }

整个布局xml

    　　　　　　//滑动列表        　　　　　　　　...        　　　　　// 输入框

接下来在键盘弹出收起过程中对根布局做平移处理。

关键词： 切换效果 构造方法 所有属性