防止旋转后EditText聚焦 [英] Prevent EditText from focussing after rotation

问题描述

我已经实现了一个简单的EditText，它提供了一个Done按钮来隐藏键盘，并且在旋转到横向时不会为EditText提供全屏对话框.但是有一个问题.当我点击完成"以关闭键盘，然后将设备旋转至横向时，将出现键盘.如果我再次关闭它，然后旋转至纵向，键盘将再次出现.

I've implemented a simple EditText that provides a Done button to hide the keyboard and upon rotating to landscape it does not present a full screen dialog for the EditText. But there's a problem. When I tap Done to dismiss the keyboard then I rotate the device to landscape, the keyboard appears. If I dismiss it again then rotate to portrait the keyboard appears yet again.

如何在旋转时保留键盘可见性状态-如果在旋转前隐藏了键盘可见性状态，则在旋转后不呈现它，但是如果在旋转前可见，则在旋转后呈现它?

How can I preserve the keyboard visibility state upon rotation - if it was hidden before rotation then don't present it after rotation, but if it was visible before rotation then present it after rotation?

<EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editText1"
        android:inputType="text"
        android:imeOptions="flagNoFullscreen|actionDone" />

我尝试在父容器(RelativeLayout)中设置android:descendantFocusability="beforeDescendants"和android:focusableInTouchMode="true"，但这并没有影响此行为.

I tried setting android:descendantFocusability="beforeDescendants" and android:focusableInTouchMode="true" in the parent container (RelativeLayout), but that didn't affect this behavior.

推荐答案

有两个选项. 在您的onCreate()方法中，尝试以下选项

There are two options.. In your onCreate() method try these options

选项1.

this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

选项2

edittext.clearFocus();

此选项将焦点设置回活动中的第一个可聚焦视图.

This option sets the focus back to the first focusable view in the activity.

如果您自己的edittext本身是活动中的第一个可聚焦视图，则选项2将不起作用，因为clearFocus将焦点重新设置为活动中的第一个可聚焦视图.

Option 2 will not work if your edittext it self is the first focusable view in your activity as clearFocus sets the focus back to first focusable view in your activity.

选项1的使用:

public class MyActivity extends Activity {
EditText editText1;
boolean isKeyBoardOpen=false;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);
    editText1 = (EditText) findViewById(R.id.editText1);

    if(savedInstanceState!=null &&(savedInstanceState.getBoolean("isKeyBoardOpen",false)))
           this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
    else  this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);


    final View activityRootView = findViewById(R.id.root_layout);
    activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

        @Override
        public void onGlobalLayout() {
            Rect r = new Rect();
            //r will be populated with the coordinates of your view that area still visible.
            activityRootView.getWindowVisibleDisplayFrame(r);
            int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
            if (heightDiff > 100) { // if more than 100 pixels, its probably a keyboard...
                isKeyBoardOpen=true;
            }else isKeyBoardOpen=false;
        }
    });
 }


protected void onSaveInstanceState(final Bundle bundle) {
    super.onSaveInstanceState(bundle);
    bundle.putBoolean("isKeyBoardOpen",isKeyBoardOpen);

}
}

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