com.kyo.fitssystemwindows.FitsSystemWindowsFrameLayout2.java Source code

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Here is the source code for com.kyo.fitssystemwindows.FitsSystemWindowsFrameLayout2.java

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/**
 * Copyright 2016, KyoSherlock
 * <p/>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.kyo.fitssystemwindows;

import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.support.v4.view.ViewCompat;
import android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.util.Log;
import android.util.TypedValue;

/**
 * Created by jianghui on 6/20/16.
 */
public class FitsSystemWindowsFrameLayout2 extends FitsSystemWindowsFrameLayout {

    private int effectiveHeight;
    private int lastLimitHeight;
    private int lastBottomInset;
    private OnKeyboardVisibleChangedListener onKeyboardVisibleChangedListener;

    public FitsSystemWindowsFrameLayout2(Context context) {
        super(context);
        this.init(context);
    }

    public FitsSystemWindowsFrameLayout2(Context context, AttributeSet attrs) {
        super(context, attrs);
        this.init(context);
    }

    public FitsSystemWindowsFrameLayout2(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        this.init(context);
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public FitsSystemWindowsFrameLayout2(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        this.init(context);
    }

    public void setOnKeyboardVisibleChangedListener(
            OnKeyboardVisibleChangedListener onKeyboardVisibleChangedListener) {
        this.onKeyboardVisibleChangedListener = onKeyboardVisibleChangedListener;
    }

    private void init(Context context) {
        effectiveHeight = dp2px(context, 200);
    }

    public static int dp2px(Context context, float dp) {
        DisplayMetrics metrics = context.getResources().getDisplayMetrics();
        final int px = (int) (metrics.density * dp + 0.5f);
        if (px != 0)
            return px;
        if (dp == 0)
            return 0;
        if (dp > 0)
            return 1;
        return -1;
    }

    public static int getActionBarHeight(Context context) {
        int result = 0;
        TypedValue tv = new TypedValue();
        context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true);
        if (tv.resourceId > 0) {

            result = context.getResources().getDimensionPixelSize(tv.resourceId);
        }
        return result;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int mode = MeasureSpec.getMode(heightMeasureSpec);
        if (mode == MeasureSpec.UNSPECIFIED) {
            throw new IllegalStateException("WindowInsetsFrameLayout2 is not supported in this case!");
        }

        if (Build.VERSION.SDK_INT >= 21) {
            final boolean applyInsets = lastInsets != null && ViewCompat.getFitsSystemWindows(this);
            if (applyInsets) {
                int bottomInset = FitsSystemWindowsFrameLayout2CompatApi21.getBottomInset(lastInsets);
                Log.i("kyo", "lastBottomInset:" + lastBottomInset);
                if (bottomInset > lastBottomInset) {
                    int distance = bottomInset - lastBottomInset;
                    if (distance > effectiveHeight) { // This judgment is superfluous
                        dispatchKeyboardVisibleChanged(true, distance);
                    }
                } else if (bottomInset < lastBottomInset) {
                    int distance = lastBottomInset - bottomInset;
                    if (distance > effectiveHeight) {
                        dispatchKeyboardVisibleChanged(false, distance);
                    }
                }
                lastBottomInset = bottomInset;
            }
        } else {
            int height = MeasureSpec.getSize(heightMeasureSpec);
            if (lastLimitHeight == 0) {
                lastLimitHeight = height;
            } else {
                if (height > lastLimitHeight) {
                    int distance = height - lastLimitHeight;
                    if (distance > effectiveHeight) {
                        dispatchKeyboardVisibleChanged(false, distance);
                    }
                } else if (height < lastLimitHeight) {
                    int distance = lastLimitHeight - height;
                    if (distance > effectiveHeight) {
                        dispatchKeyboardVisibleChanged(true, distance);
                    }
                }
                lastLimitHeight = height;
            }
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    private void dispatchKeyboardVisibleChanged(boolean visible, int height) {
        if (onKeyboardVisibleChangedListener != null) {
            onKeyboardVisibleChangedListener.onKeyboardVisibleChanged(visible, height);
        }
    }
}