Android 实现对软键盘(收起和弹出)的监听

Activity 中如下 ：

public class WatcherSoftInputActivity extends Activity implements  keyboardWatcher.OnKeyboardToggleListener{
    @Override
    public void onKeyboardShown(int keyboardSize) {
        Toast.makeText(WatcherSoftInputActivity.this, "软键盘显示", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onKeyboardClosed() {
        Toast.makeText(WatcherSoftInputActivity.this, "软键盘关闭", Toast.LENGTH_SHORT).show();
    }

    private keyboardWatcher mKeyboardWatcher;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.watchersoftinputlayout);

        mKeyboardWatcher = new keyboardWatcher(this);
        mKeyboardWatcher.setListener(this);
    }

@Override
    protected void onDestroy() {
        mKeyboardWatcher.destroy();
        super.onDestroy();

    }
}

自定义

keyboardWatcher.java  完成对键盘的监听

keyboardWatcher.java代码如下：

package net.bither.util;

/**
 * Created by stewart on 16-4-5.
 */

import android.app.Activity;
import android.os.Build;
import android.view.View;
import android.view.ViewTreeObserver;
import android.view.Window;
import android.view.WindowManager;

import java.lang.ref.WeakReference;

public class keyboardWatcher {

    private WeakReference<Activity> activityRef;
    private WeakReference<View> rootViewRef;
    private WeakReference<OnKeyboardToggleListener> onKeyboardToggleListenerRef;
    private ViewTreeObserver.OnGlobalLayoutListener viewTreeObserverListener;

    public keyboardWatcher(Activity activity) {
        activityRef = new WeakReference<>(activity);
        initialize();
    }

    public void setListener(OnKeyboardToggleListener onKeyboardToggleListener) {
        onKeyboardToggleListenerRef = new WeakReference<>(onKeyboardToggleListener);
    }

    public void destroy() {
        if (rootViewRef.get() != null)
            if (Build.VERSION.SDK_INT >= 16) {
                rootViewRef.get().getViewTreeObserver().removeOnGlobalLayoutListener(viewTreeObserverListener);
            } else {
                rootViewRef.get().getViewTreeObserver().removeGlobalOnLayoutListener(viewTreeObserverListener);
            }
    }

    private void initialize() {
        if (hasAdjustResizeInputMode()) {
            viewTreeObserverListener = new GlobalLayoutListener();
            rootViewRef = new WeakReference<>(activityRef.get().findViewById(Window.ID_ANDROID_CONTENT));
            rootViewRef.get().getViewTreeObserver().addOnGlobalLayoutListener(viewTreeObserverListener);
        } else {
            throw new IllegalArgumentException(String.format("Activity %s should have windowSoftInputMode="adjustResize"" +
                    "to make KeyboardWatcher working. You can set it in AndroidManifest.xml", activityRef.get().getClass().getSimpleName()));
        }
    }

    private boolean hasAdjustResizeInputMode() {
        return (activityRef.get().getWindow().getAttributes().softInputMode & WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE) != 0;
    }

    private class GlobalLayoutListener implements ViewTreeObserver.OnGlobalLayoutListener {
        int initialValue;
        boolean hasSentInitialAction;
        boolean isKeyboardShown;

        @Override
        public void onGlobalLayout() {
            if (initialValue == 0) {
                initialValue = rootViewRef.get().getHeight();
            } else {
                if (initialValue > rootViewRef.get().getHeight()) {
                    if (onKeyboardToggleListenerRef.get() != null) {
                        if (!hasSentInitialAction || !isKeyboardShown) {
                            isKeyboardShown = true;
                            onKeyboardToggleListenerRef.get().onKeyboardShown(initialValue - rootViewRef.get().getHeight());
                        }
                    }
                } else {
                    if (!hasSentInitialAction || isKeyboardShown) {
                        isKeyboardShown = false;
                        rootViewRef.get().post(new Runnable() {
                            @Override
                            public void run() {
                                if (onKeyboardToggleListenerRef.get() != null) {
                                    onKeyboardToggleListenerRef.get().onKeyboardClosed();
                                }
                            }
                        });
                    }
                }
                hasSentInitialAction = true;
            }
        }
    }

    public interface OnKeyboardToggleListener {
        void onKeyboardShown(int keyboardSize);

        void onKeyboardClosed();
    }
}