Android软键盘状态弹出与消失

     最近遇到了关于软键盘的问题，需要获取到软键盘的状态，是否在显示 ，记录一下，方便以后查阅。网上常见的判定状态方法

getWindow().getAttributes().softInputMode== WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED  
来判断软键盘是否打开，若相等则为打开。试了之后，发现这个只对手机自带的键盘有作用，对安装的第三方的输入法没有效果。
    还有介绍使用InputMethodManager 来获取键盘状态，代码如下
 InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); boolean isOpen=imm.isActive();//isOpen若返回true，则表示输入法打开这种并不能实时获取到键盘的状态，对我依然没有效果。
   后来找到的解决方法，监听屏幕的变化，代码如下：
import android.app.Activity;import android.content.Context;import android.graphics.Rect;import android.os.Build;import android.util.Log;import android.util.TypedValue;import android.view.View;import android.view.ViewGroup;import android.view.ViewTreeObserver;/** *  * 软键盘的监听 */public class KeyBoardShowListener {    PRivate Context ctx;    public KeyBoardShowListener(Context ctx) {        this.ctx = ctx;    }    OnKeyboardVisibilityListener keyboardListener;    public OnKeyboardVisibilityListener getKeyboardListener() {        return keyboardListener;    }    public interface OnKeyboardVisibilityListener {        void onVisibilityChanged(boolean visible);    }    public  void setKeyboardListener(final OnKeyboardVisibilityListener listener, Activity activity) {        final View activityRootView = ((ViewGroup) activity.findViewById(android.R.id.content)).getChildAt(0);        activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {            private boolean wasOpened;            private final int DefaultKeyboardDP = 100;            // From @nathanielwolf answer...  Lollipop includes button bar in the root. Add height of button bar (48dp) to maxDiff            private final int EstimatedKeyboardDP = DefaultKeyboardDP + (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);            private final Rect r = new Rect();            @Override            public void onGlobalLayout() {                // Convert the dp to pixels.                int estimatedKeyboardHeight = (int) TypedValue                        .applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP, activityRootView.getResources().getDisplayMetrics());                // Conclude whether the keyboard is shown or not.                activityRootView.getWindowVisibleDisplayFrame(r);                int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);                boolean isShown = heightDiff >= estimatedKeyboardHeight;                if (isShown == wasOpened) {                    Log.e("Keyboard state", "Ignoring global layout change...");                    return;                }                wasOpened = isShown;                listener.onVisibilityChanged(isShown);            }        });    }}
用法如下： 
//监听软键盘的状态new KeyBoardShowListener(Activity.this).setKeyboardListener(        new KeyBoardShowListener.OnKeyboardVisibilityListener() {            @Override            public void onVisibilityChanged(boolean visible) {                if (visible) {                    //软键盘已弹出                                    } else {                    //软键盘未弹出                                    }            }        }, Activity.this);
以下是可能会遇到的一些情况：原文链接  http://snowcoal.com/article/641.html
绑定软键盘到EditText
edit.setFocusable(true);edit.setFocusableInTouchMode(true);edit.requestFocus();InputMethodManager inputManager = (InputMethodManager)edit.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);inputManager.showSoftInput(edit,0);
去除软键盘显示：
editMsgView.setText("");editMsgView.clearFocus();//close InputMethodManagerInputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);imm.hideSoftInputFromWindow(editMsgView.getWindowToken(),0);
始终不弹出软件键盘
EditText edit=(EditText)findViewById(R.id.edit); edit.setInputType(InputType.TYPE_NULL);
也可以：
InputMethodManager imm = (InputMethodManager)v.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);if(imm.isActive()){ //这里可以判断也可以不判断imm.hideSoftInputFromWindow(v.getapplicationWindowToken(),0 );}