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Android全屏时软键盘监听

Android全屏时软键盘监听

作者: Leon_hy | 来源:发表于2017-11-07 18:25 被阅读136次

    作者:ADark0915

    出处:http://www.cnblogs.com/shelly-li/

    首先,在manifest文件中声明此Activity的windowSoftInputMode属性,

      android:windowSoftInputMode="stateVisible|adjustResize" 
    

    在Activity中 声明所需用到的变量以及布局的事件监听,

    private boolean mBackEnable = false;
    private boolean mIsBtnBack = false;
    private int rootBottom = Integer.MIN_VALUE;
    private OnGlobalLayoutListener mOnGlobalLayoutListener = new OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            Rect r = new Rect();
            mSearchLayout.getGlobalVisibleRect(r);
            // 进入Activity时会布局,第一次调用onGlobalLayout,先记录开始软键盘没有弹出时底部的位置
            if (rootBottom == Integer.MIN_VALUE) {
                rootBottom = r.bottom;
                return;
            }
            // adjustResize,软键盘弹出后高度会变小
            if (r.bottom < rootBottom) {
                mBackEnable = false;
            } else {
                mBackEnable = true;
                if (mIsBtnBack) {
                    finish();
                }
            }
        }
    };
    

    然后在onCreat方法中去注册事件监听

    mSearchLayout.getViewTreeObserver().addOnGlobalLayoutListener(mOnGlobalLayoutListener);
    

    注意:这个mSearchlayout是你整个Activity的布局引用

    最后,别忘了,在onDestroy方法中回收掉事件的监听

      @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
     @Override
      protected void onDestroy() {
        if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.JELLY_BEAN) {
            
       mSearchLayout.getViewTreeObserver().removeGlobalOnLayoutListener(mOnGlobalLayoutListener);
        } else {
            
       mSearchLayout.getViewTreeObserver().removeOnGlobalLayoutListener(mOnGlobalLayoutListener);
        }
        super.onDestroy();
    }
    

    到这里,android软键盘的监听就结束了。

    什么?你说全屏的时候,没有效果???

    好吧,我也遇到了。。。

    我在项目中实现了所有界面的沉浸式效果,本以为Activity设置了adjustResize,OnGlobalLayoutListener仍然能监听软键盘的变化,结果却是屡试不行。。。

    无奈,只能求助。查了一些资料,发现这原来是android的一个bug。下面是具体的bug修复代码片段

    public class AndroidAdjustResizeBugFix {
    private View mChildOfContent;
    private int usableHeightPrevious;
    private int statusBarHeight;
    private FrameLayout.LayoutParams frameLayoutParams;
    private Activity mActivity;

    private AndroidAdjustResizeBugFix(Activity activity) {
        mActivity = activity;
        FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
        mChildOfContent = content.getChildAt(0);
        statusBarHeight = getStatusBarHeight();
        mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            public void onGlobalLayout() {
                possiblyResizeChildOfContent();
            }
        });
        frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
    }
    public static void assistActivity(Activity activity) {
        new AndroidAdjustResizeBugFix(activity);
    }
    private void possiblyResizeChildOfContent() {
        int usableHeightNow = computeUsableHeight();
        if (usableHeightNow != usableHeightPrevious) {
            int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
            int heightDifference = usableHeightSansKeyboard - usableHeightNow;
            if (heightDifference > (usableHeightSansKeyboard / 4)) {
                // keyboard probably just became visible
                // 如果有高度变化,mChildOfContent.requestLayout()之后界面才会重新测量
                // 这里就随便让原来的高度减去了1
                frameLayoutParams.height = usableHeightSansKeyboard - 1;
              键盘开启
            } else {
                // keyboard probably just became hidden
                frameLayoutParams.height = usableHeightSansKeyboard; 
            键盘关闭
            }
            mChildOfContent.requestLayout();
            usableHeightPrevious = usableHeightNow;
        }
    }
    private int computeUsableHeight() {
        Rect r = new Rect();
        mChildOfContent.getWindowVisibleDisplayFrame(r);
        return r.bottom - r.top + statusBarHeight;
    }
    private int getStatusBarHeight() {
        try {
            Class<?> c = Class.forName("com.android.internal.R$dimen");
            Object obj = c.newInstance();
            Field field = c.getField("status_bar_height");
            int x = Integer.parseInt(field.get(obj).toString());
            int dimensionPixelSize = mActivity.getResources().getDimensionPixelSize(x);
            return dimensionPixelSize;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return 0;
    }
    

    }
    把这个类作为一个工具类,添加到项目中,然后,在需要做优化的Activity的onCreate方法中注册activity即可,如:

    AndroidAdjustResizeBugFix.assistActivity(this);

    以上,就是关于监听软键盘弹出和收起的所有内容。

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