Android软键盘监听

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开发中我们可能需要对软键盘进行监听，比如登陆页面，当软键盘抬起的时候，会将输入密码和登录按钮给遮挡住，用户输入完账号后得先按下软键盘再点击密码进行输入，体验很差，如下：

而我们想要如下效果：

~这就需要针对软件盘做一些操作了~

参考资料：http://www.cnblogs.com/shelly-li/p/5639833.html and http://www.2cto.com/kf/201405/298962.html将这两篇博客结合在一起，完美解决问题

一、在AndroidManifest.xml文件中对当前activity添加 android:windowSoftInputMode=”adjustResize|stateHidden”

二、自定义监听软件盘的布局

public class KeyboardLayout extends RelativeLayout {private onSizeChangedListener mChangedListener;private static final String TAG = "KeyboardLayoutTAG";private boolean mShowKeyboard = false;public KeyboardLayout(Context context, AttributeSet attrs, int defStyle) {    super(context, attrs, defStyle);    // TODO Auto-generated constructor stub}public KeyboardLayout(Context context, AttributeSet attrs) {    super(context, attrs);    // TODO Auto-generated constructor stub}public KeyboardLayout(Context context) {    super(context);    // TODO Auto-generated constructor stub}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    // TODO Auto-generated method stub    super.onMeasure(widthMeasureSpec, heightMeasureSpec);    Log.d(TAG, "onMeasure-----------");}@Overrideprotected void onLayout(boolean changed, int l, int t, int r, int b) {    // TODO Auto-generated method stub    super.onLayout(changed, l, t, r, b);}@Overrideprotected void onSizeChanged(int w, int h, int oldw, int oldh) {    // TODO Auto-generated method stub    super.onSizeChanged(w, h, oldw, oldh);    if (null != mChangedListener && 0 != oldw && 0 != oldh) {        if (h < oldh) {            mShowKeyboard = true;        } else {            mShowKeyboard = false;        }        mChangedListener.onChanged(mShowKeyboard);    }}public void setOnSizeChangedListener(onSizeChangedListener listener) {    mChangedListener = listener;}public interface onSizeChangedListener {    void onChanged(boolean showKeyboard);}}

三、布局文件使用我们自定义的布局，将其放入根节点：

四、还需要写一个类，是对软键盘adjustResize属性的修复

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;        } else {            // keyboard probably just became hidden            frameLayoutParams.height = usableHeightSansKeyboard;        }        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;}}

五、在当前activity的oncreate方法中加入 AndroidAdjustResizeBugFix.assistActivity(this);

给我们自定义的布局添加软键盘监听

 mRootView.setOnSizeChangedListener(new KeyboardLayout.onSizeChangedListener() {        @Override        public void onChanged(boolean showKeyboard) {            if (showKeyboard) {                mHandler.sendMessage(mHandler.obtainMessage(KEYBOARD_SHOW));            } else {                mHandler.sendMessage(mHandler.obtainMessage(KEYBOARD_HIDE));            }        }    });

然后在Handler中进行后续操作

 private Handler mHandler = new Handler() {    @Override    public void handleMessage(Message msg) {        super.handleMessage(msg);        switch (msg.what) {            case KEYBOARD_HIDE:                mContentView.setPadding(0, 0, 0, 0);                break;            case KEYBOARD_SHOW:              //mContentView.setPadding(0,"需要移动的距离",0,0);                break;            default:                break;        }    }};