第一次提交

whyclj

2019-12-31 d2272f21a9d4491f22b3d3c9d6dbfebcecff76e3

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package com.mytestapp;
 
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();
            }
        }
    }
}