android 监听软键盘打开收起事件（软键盘自带收起按钮）

import android.graphics.Rect;  
import android.view.View;  
import android.view.ViewTreeObserver;  
  
import java.util.LinkedList;  
import java.util.List;  
  
public class SoftKeyboardStateHelper implements ViewTreeObserver.OnGlobalLayoutListener {  
  
    public interface SoftKeyboardStateListener {  
        void onSoftKeyboardOpened(int keyboardHeightInPx);  
        void onSoftKeyboardClosed();  
    }  
  
    private final List<SoftKeyboardStateListener> listeners = new LinkedList<SoftKeyboardStateListener>();  
    private final View activityRootView;  
    private int        lastSoftKeyboardHeightInPx;  
    private boolean    isSoftKeyboardOpened;  
  
    public SoftKeyboardStateHelper(View activityRootView) {  
        this(activityRootView, false);  
    }  
  
    public SoftKeyboardStateHelper(View activityRootView, boolean isSoftKeyboardOpened) {  
        this.activityRootView     = activityRootView;  
        this.isSoftKeyboardOpened = isSoftKeyboardOpened;  
        activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(this);  
    }  
  
    @Override  
    public void onGlobalLayout() {  
        final Rect r = new Rect();  
        //r will be populated with the coordinates of your view that area still visible.  
        activityRootView.getWindowVisibleDisplayFrame(r);  
  
        final int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);  
        if (!isSoftKeyboardOpened && heightDiff > 100) { // if more than 100 pixels, its probably a keyboard...  
            isSoftKeyboardOpened = true;  
            notifyOnSoftKeyboardOpened(heightDiff);  
        } else if (isSoftKeyboardOpened && heightDiff < 100) {  
            isSoftKeyboardOpened = false;  
            notifyOnSoftKeyboardClosed();  
        }  
    }  
  
    public void setIsSoftKeyboardOpened(boolean isSoftKeyboardOpened) {  
        this.isSoftKeyboardOpened = isSoftKeyboardOpened;  
    }  
  
    public boolean isSoftKeyboardOpened() {  
        return isSoftKeyboardOpened;  
    }  
  
    /** 
     * Default value is zero (0) 
     * @return last saved keyboard height in px 
     */  
    public int getLastSoftKeyboardHeightInPx() {  
        return lastSoftKeyboardHeightInPx;  
    }  
  
    public void addSoftKeyboardStateListener(SoftKeyboardStateListener listener) {  
        listeners.add(listener);  
    }  
  
    public void removeSoftKeyboardStateListener(SoftKeyboardStateListener listener) {  
        listeners.remove(listener);  
    }  
  
    private void notifyOnSoftKeyboardOpened(int keyboardHeightInPx) {  
        this.lastSoftKeyboardHeightInPx = keyboardHeightInPx;  
  
        for (SoftKeyboardStateListener listener : listeners) {  
            if (listener != null) {  
                listener.onSoftKeyboardOpened(keyboardHeightInPx);  
            }  
        }  
    }  
  
    private void notifyOnSoftKeyboardClosed() {  
        for (SoftKeyboardStateListener listener : listeners) {  
            if (listener != null) {  
                listener.onSoftKeyboardClosed();  
            }  
        }  
    }  
}  

代码的调用 popup_view = rootview

 SoftKeyboardStateHelper softKeyboardStateHelper = new SoftKeyboardStateHelper(popup_view);
        softKeyboardStateHelper.addSoftKeyboardStateListener(new SoftKeyboardStateHelper.SoftKeyboardStateListener() {
            @Override
            public void onSoftKeyboardOpened(int keyboardHeightInPx) {

            }
            @Override
            public void onSoftKeyboardClosed() {
                popup_view.requestFocus();
            }
        });

stackoverflow ： http://stackoverflow.com/questions/2150078/how-to-check-visibility-of-software-keyboard-in-android
原文连接：http://blog.csdn.net/xcookies/article/details/43024911#

第二种实现方法

//该Activity的最外层Layout
finalView activityRootView = findViewById(R.id.activityRoot);
 
//给该layout设置监听，监听其布局发生变化事件
activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(newOnGlobalLayoutListener(){

    @Override
    publicvoid onGlobalLayout(){
 
       //比较Activity根布局与当前布局的大小
        int heightDiff = activityRootView.getRootView().getHeight()- activityRootView.getHeight();
        if(heightDiff >100){
        //大小超过100时，一般为显示虚拟键盘事件
             }else{
        //大小小于100时，为不显示虚拟键盘或虚拟键盘隐藏
       }
     }
});