键盘显示时Editext获取焦点，键盘隐藏时失去焦点

做搜索框时遇到一个需求：键盘显示时Editext获取焦点，键盘隐藏时失去焦点，看起来比较人性化

新建一个类，SoftKeyBoardListener：

import android.app.Activity;
import android.graphics.Rect;
import android.view.View;
import android.view.ViewTreeObserver;


public class SoftKeyBoardListener {
    private View rootView;//activity的根视图
    int rootViewVisibleHeight;//纪录根视图的显示高度
    private OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener;

    public SoftKeyBoardListener(Activity activity) {
        //获取activity的根视图
        rootView = activity.getWindow().getDecorView();

        //监听视图树中全局布局发生改变或者视图树中的某个视图的可视状态发生改变
        rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                //获取当前根视图在屏幕上显示的大小
                Rect r = new Rect();
                rootView.getWindowVisibleDisplayFrame(r);

                int visibleHeight = r.height();
                System.out.println("" + visibleHeight);
                if (rootViewVisibleHeight == 0) {
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }

                //根视图显示高度没有变化，可以看作软键盘显示／隐藏状态没有改变
                if (rootViewVisibleHeight == visibleHeight) {
                    return;
                }

                //根视图显示高度变小超过200，可以看作软键盘显示了
                if (rootViewVisibleHeight - visibleHeight > 200) {
                    if (onSoftKeyBoardChangeListener != null) {
                        onSoftKeyBoardChangeListener.keyBoardShow(rootViewVisibleHeight - visibleHeight);
                    }
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }

                //根视图显示高度变大超过200，可以看作软键盘隐藏了
                if (visibleHeight - rootViewVisibleHeight > 200) {
                    if (onSoftKeyBoardChangeListener != null) {
                        onSoftKeyBoardChangeListener.keyBoardHide(visibleHeight - rootViewVisibleHeight);
                    }
                    rootViewVisibleHeight = visibleHeight;
                    return;
                }

            }
        });
    }

    private void setOnSoftKeyBoardChangeListener(OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
        this.onSoftKeyBoardChangeListener = onSoftKeyBoardChangeListener;
    }

    public interface OnSoftKeyBoardChangeListener {
        void keyBoardShow(int height);

        void keyBoardHide(int height);
    }

    public static void setListener(Activity activity, OnSoftKeyBoardChangeListener onSoftKeyBoardChangeListener) {
        SoftKeyBoardListener softKeyBoardListener = new SoftKeyBoardListener(activity);
        softKeyBoardListener.setOnSoftKeyBoardChangeListener(onSoftKeyBoardChangeListener);
    }
}

在需要的Activity里面添加，mEditText是监听的EditText：

SoftKeyBoardListener.setListener(ChoosePlateActivity.this, new SoftKeyBoardListener.OnSoftKeyBoardChangeListener() {
@Override
public void keyBoardShow(int height) {
Toast.makeText(ChoosePlateActivity.this, "键盘显示 高度" + height, Toast.LENGTH_SHORT).show();
mEditText.requestFocus();
}

@Override
public void keyBoardHide(int height) {
Toast.makeText(ChoosePlateActivity.this, "键盘隐藏 高度" + height, Toast.LENGTH_SHORT).show();
mEditText.clearFocus();

}
});

如果需要跳转之后获取焦点：

 mEditText.setFocusableInTouchMode(true);
        mEditText.requestFocus();
        //延时打开
        Timer timer = new Timer();
        timer.schedule(new TimerTask()
                       {

                           public void run()
                           {
                               InputMethodManager inputManager =
                                       (InputMethodManager)mEditText.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
                               inputManager.showSoftInput(mEditText, 0);
                           }

                       },
                998);

参考

• Android监听键盘弹出收起