Android的定制的EditText和后退按钮覆盖 [英] Android custom EditText and back button override

问题描述

我要重写后退按钮显示软键盘时。基本上当后退按钮被击中，我想键盘辞退了，我要追加一些文字上的任何用户在编辑文本字段中键入。所以基本上我需要当键盘被驳回知道。周围搜索后，我意识到有这种没有API，而要做到这一点的唯一真正的方法是使你的EditText类。

I want to override the back button when the soft keyboard is shown. Basically when the back button is hit, I want the keyboard to dismiss, and I want to append some text onto whatever the user has typed in that edit text field. So basically I need to know when the keyboard is dismissed. After searching around, I realized there is no API for this, and that the only real way to do this would be to make your EditText class.

所以，我创建了自己的EditText类和扩展的EditText这样

So I created my own EditText class and extended EditText like this

public class CustomEditText extends EditText
{

    public CustomEditText(Context context)
    {
        super(context);
        init();
    }

    public CustomEditText(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        init();
    }

    public CustomEditText(Context context, AttributeSet attrs, int defStyle)
    {
        super(context, attrs, defStyle);
        init();
    }

    private void init()
    {

    }

}

我也加入了这个方法。

I have also added this method

    @Override
        public boolean dispatchKeyEventPreIme(KeyEvent event)
        {
            if (KeyEvent.KEYCODE_BACK == event.getKeyCode())
            {
                Log.v("", "Back Pressed");

                            //Want to call this method which will append text
                            //init();
            }
            return super.dispatchKeyEventPreIme(event);
        }

现在这个方法不覆盖的后退按钮，它会关闭键盘，但我不知道我怎么会通过文本到的EditText字段中。有谁知道我会怎么做呢？

Now this method does override the back button, it closes the keyboard, but I dont know how I would pass text into the EditText field. Does anyone know how I would do this?

另一种快速的问题，没有人知道为什么这种方法被称为两次？正如你可以看到暂时的，我添加了一个快速的logcat消息来测试它的工作原理，但是当我打的返回按钮，它打印了两次，任何理由为什么它会是这样？

Also another quick question, does anyone know why this method is called twice? As you can see for the time being, I have added a quick logcat message to test it works, but when I hit the back button, it prints it twice, any reason why it would be doing this?

任何帮助将是非常美联社preciated !!

Any help would be much appreciated!!

推荐答案

这是由于d​​ispatchKeyEvent $ P $宗座外方传教会正在呼吁两国的 ACTION_DOWN 和的 ACTION_UP 。结果
你将不得不处理，只有当KEY下来就是pssed $ P $。因此，使用

This is due to the dispatchKeyEventPreIme being called on both ACTION_DOWN and ACTION_UP.
You will have to process only when KEY down is pressed. So use

如果（event.getAction（）== KeyEvent.ACTION_DOWN）

编辑：
对于第一个问题你可以做

for the first question You could do

setText(getText().toString() + " whatever you want to append"); 

在 dispatchKeyEvent $ P $宗座外方传教会

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