Android 监听输入法隐藏与显示状态切换

前项目需求需要监听在输入法弹起和隐藏的时候，更改界面的相关显示。一开始控制界面是否显示是调用自己写的工具类。



也就是自己知道什么时候会强制调用KeyBord的close和open方法，因此一切还很完美。

结果，坑爹的搜狗输入法右上角竟然有一个隐藏输入法的按钮，我却监听不到这个按钮事件。

一开始我的思路是盯着如何捕获键盘按钮事件，整的头大。还是众人拾柴火焰高，同事找到了其他方法，即监听当前界面绘制布局的改变。这里我简单包装了一下。下面就是我自定义的输入法状态监听类，

<span style="font-size:18px;color:#3333FF;"><code class="hljs java has-numbering"><span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">onInputLayoutChangeListener</span> <span class="hljs-keyword">implements</span> <span class="hljs-title">ViewTreeObserver</span>.<span class="hljs-title">OnGlobalLayoutListener</span> {</span>
<span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">final</span> UnifyLog lg = UnifyLogFactory.getLogger(onInputLayoutChangeListener.class.getSimpleName());

<span class="hljs-keyword">private</span> View rootView;
<span class="hljs-keyword">private</span> <span class="hljs-keyword">int</span> curRectHeight = -<span class="hljs-number">1</span>;

<span class="hljs-keyword">public</span> <span class="hljs-title">onInputLayoutChangeListener</span>(View rootView) {
<span class="hljs-keyword">this</span>.rootView = rootView;
}

<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onGlobalLayout</span>() {
Rect rect = <span class="hljs-keyword">new</span> Rect();
rootView.getWindowVisibleDisplayFrame(rect);
<span class="hljs-keyword">int</span> displayHight = rect.bottom - rect.top;
<span class="hljs-keyword">int</span> height = rootView.getHeight();
lg.e(<span class="hljs-string">"RectHeight:"</span> + displayHight + <span class="hljs-string">",DecorViewHeigt:"</span> + height);
<span class="hljs-comment">//        if (curRectHeight != displayHight) {</span>
<span class="hljs-comment">//            curRectHeight = displayHight;</span>
<span class="hljs-comment">//            onLayoutChange(displayHight, height);</span>
<span class="hljs-comment">//        }</span>
onLayoutChange(displayHight, height);
}

<span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onLayoutChange</span>(<span class="hljs-keyword">int</span> intputTop, <span class="hljs-keyword">int</span> windowHeight);
}</code></span>

调用方式：

<span style="font-size:18px;color:#3333FF;"><code class="hljs java has-numbering">getWindow().getDecorView().getViewTreeObserver().addOnGlobalLayoutListener(<span class="hljs-keyword">new</span> onInputLayoutChangeListener(getWindow().getDecorView()) {
<span class="hljs-annotation">@Override</span>
<span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">onLayoutChange</span>(<span class="hljs-keyword">int</span> intputTop, <span class="hljs-keyword">int</span> windowHeight) {
edtInputContent.setY(intputTop - edtInputContent.getMeasuredHeight());
}
});</code></span>