在Android WebView中读取键盘事件

public class MyWebView extends WebView implements OnKeyListener
{
    .....

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event)
    {
        Log.i("PcWebView", "onKeyDown keyCode=" + keyCode);
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event)
    {
        Log.i("PcWebView", "onKeyUp keyCode=" + keyCode);
        return super.onKeyUp(keyCode, event);
    }

    @Override // Listener is initialized in the constructor
    public boolean onKey(View v, int keyCode, KeyEvent event)
    {
        Log.i("PcWebView", "onKey keyCode=" + keyCode);
        return false;
    }

    .....

}

当用户键入文本框或textareas时,都不会调用onKeyDown,onKeyUp和onKey方法.是否有可能实现这一点,或者Android是否限制了这种可能的隐私泄露？

完成后无需访问HTML源代码或JS事件.适用于Android 5.0.2的软键盘和硬键盘.

public class MyWebView extends WebView {


    @Override
    public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
        return new BaseInputConnection(this, false); //this is needed for #dispatchKeyEvent() to be notified.
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        boolean dispatchFirst = super.dispatchKeyEvent(event);
        // Listening here for whatever key events you need
        if (event.getAction() == KeyEvent.ACTION_UP)
            switch (event.getKeyCode()) {
                case KeyEvent.KEYCODE_SPACE:
                case KeyEvent.KEYCODE_ENTER:
                    // e.g. get space and enter events here
                    break;
            }
        return dispatchFirst;
    }
}

这里的技巧是用简化的方法覆盖系统提供的InputConnection输入实现.默认情况下,Google员工故意阻止开发人员访问这些事件.因为关键事件输入不再是唯一的.有手势,声音和更多即将来临.官方的建议是“停止依赖遗留的关键事件进行文本输入”.点击此处查看更多详情：https://code.google.com/p/android/issues/detail?id=42904#c15