Android按键拦截处理最佳实践范例（以Back事件为例）

来源：互联网发布：跟兄弟连学php 视频编辑：程序博客网时间：2024/05/16 00:49

想拦截所有情况下的按键：

</pre><pre name="code" class="java">@Override    public boolean dispatchKeyEventPreIme(KeyEvent event)    {        if (event.getAction() == KeyEvent.ACTION_DOWN//                && event.getKeyCode() == KeyEvent.KEYCODE_BACK)        {            // doSth...            return true;        }        return super.dispatchKeyEventPreIme(event);    }

想处理子View不处理的按键：

    @Override    public boolean dispatchKeyEvent(KeyEvent event)    {        boolean handled = super.dispatchKeyEvent(event);        if (!handled)        {            if (event.getAction() == KeyEvent.ACTION_DOWN//                    && event.getKeyCode() == KeyEvent.KEYCODE_BACK)            {                // doSth...                return true;            }        }        return handled;    }

3.想禁止IME处理，但只处理子View不处理的按键：

</pre><pre name="code" class="java">@Override    public boolean dispatchKeyEventPreIme(KeyEvent event)    {        if (event.getAction() == KeyEvent.ACTION_DOWN//                && event.getKeyCode() == KeyEvent.KEYCODE_BACK)        {            return false;        }        return super.dispatchKeyEventPreIme(event);    }    @Override    public boolean dispatchKeyEvent(KeyEvent event)    {        boolean handled = super.dispatchKeyEvent(event);        if (!handled)        {            if (event.getAction() == KeyEvent.ACTION_DOWN//                    && event.getKeyCode() == KeyEvent.KEYCODE_BACK)            {                // doSth...                return true;            }        }        return handled;    }

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