如何使用后返回preSS软键盘关闭的活动？ [英] How to close Activity with software keyboard after BACK press?

问题描述

我有一个活动，在这里我想软键盘是alaways打开。如何关闭后返回preSS的活动，当键盘打开？现在，我必须单击后退两次，第一次以关闭键盘，然后完成活动。

I have an Activity, where I want the software keyboard to be alaways opened. How to close the Activity after BACK press, when keyboard is opened? Now I have to click BACK twice, first to close the keyboard and then to finish the Activity.

推荐答案

如前所述，onKey $ P $宗座外方传教会，可以用来捕捉返回按钮，但是这需要在文本视图被覆盖，而不是在活动。

As mentioned, onKeyPreIme can be used to catch the back button, but this needs to be overridden on the text view, not in the activity.

下面是一个完整的解决方案：

Here's a complete solution:

首先，从EditText上派生新类，覆盖onKey $ P $宗座外方传教会，并调用回调接口：

First a new class that derived from EditText, overrides onKeyPreIme and calls a callback interface:

// EditTextWithBackButton class
public class EditTextWithBackButton extends EditText
{
    public interface IOnBackButtonListener
    {
        boolean OnEditTextBackButton();
    }

    public EditTextWithBackButton(Context context)
    {
        super(context);
    }

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

    public void setOnBackButtonListener(IOnBackButtonListener l)
    {
        _listener = l;
    }

    IOnBackButtonListener _listener;

    @Override
    public boolean onKeyPreIme(int keyCode, KeyEvent event)
    {
        if (event.getAction()==KeyEvent.ACTION_UP && keyCode==KeyEvent.KEYCODE_BACK)
        {
            if (_listener!=null && _listener.OnEditTextBackButton())
                return false;
        }
        return super.onKeyPreIme(keyCode, event);    //To change body of overridden methods use File | Settings | File Templates.
    }
}

其次，更新您的布局：

Next, update your layout:

<com.yournamespace.whatever.EditTextWithBackButton
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textField"
        />

接下来，更新活动，里面的OnCreate，之后的setContentView：

Next, update your activity, inside OnCreate, after setContentView:

((EditTextWithBackButton) findViewById(R.id.textField)).setOnBackButtonListener(new EditTextWithBackButton.IOnBackButtonListener()
{
    @Override
    public boolean OnEditTextBackButton()
    {
        finish();
        return true;
    }
});

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