Android沉浸式状态栏+actionBar渐变+scrollView顶部伸缩

闲话不多说，直接上图。

给大家讲讲我的编程思想吧。

第一部分：沉浸式状态栏（API-Level 19, Android4.4 KitKat 之后加入的东西），而且在Api-Level 21版本中新增了一个属性（下面会说到）。所以，style文件应该声明三份。

values

values-19

values-V21

至于以上属性的含义及使用方式，就不多做解释了。详细可参见 http://blog.csdn.net/fan7983377/article/details/51604657

第二部分：actionBar渐变

因为要实现actionBar渐变，所以我没有使用系统的actionBar。而是自定义了一个继承自LinearLayout的ViewGroup。

直接给各位看代码

package test.com.widget;

import android.content.Context;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

import test.com.R;
import test.com.impl.ActionBarClickListener;

/**
 * 支持渐变的 actionBar
 * Created by 晖仔(Milo) on 2016/12/28.
 * email:303767416@qq.com
 */

public final class TranslucentActionBar extends LinearLayout {

    private View layRoot;
    private View vStatusBar;
    private View layLeft;
    private View layRight;
    public TextView tvTitle;
    private TextView tvLeft;
    private TextView tvRight;
    private View iconLeft;
    private View iconRight;

    public TranslucentActionBar(Context context) {
        this(context, null);
    }

    public TranslucentActionBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public TranslucentActionBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    private void init() {
        setOrientation(HORIZONTAL);
        View cOntentView= inflate(getContext(), R.layout.actionbar_trans, this);
        layRoot = contentView.findViewById(R.id.lay_transroot);
        vStatusBar = contentView.findViewById(R.id.v_statusbar);
        tvTitle = (TextView) contentView.findViewById(R.id.tv_actionbar_title);
        tvLeft = (TextView) contentView.findViewById(R.id.tv_actionbar_left);
        tvRight = (TextView) contentView.findViewById(R.id.tv_actionbar_right);
        icOnLeft= contentView.findViewById(R.id.iv_actionbar_left);
        icOnRight= contentView.findViewById(R.id.v_actionbar_right);
    }

    /**
     * 设置状态栏高度
     *
     * @param statusBarHeight
     */
    public void setStatusBarHeight(int statusBarHeight) {
        ViewGroup.LayoutParams params = vStatusBar.getLayoutParams();
        params.height = statusBarHeight;
        vStatusBar.setLayoutParams(params);
    }

    /**
     * 设置是否需要渐变
     */
    public void setNeedTranslucent() {
        setNeedTranslucent(true, false);
    }

    /**
     * 设置是否需要渐变,并且隐藏标题
     *
     * @param translucent
     */
    public void setNeedTranslucent(boolean translucent, boolean titleInitVisibile) {
        if (translucent) {
            layRoot.setBackgroundDrawable(null);
        }
        if (!titleInitVisibile) {
            tvTitle.setVisibility(View.GONE);
        }
    }

    /**
     * 设置标题
     *
     * @param strTitle
     */
    public void setTitle(String strTitle) {
        if (!TextUtils.isEmpty(strTitle)) {
            tvTitle.setText(strTitle);
        } else {
            tvTitle.setVisibility(View.GONE);
        }
    }

    /**
     * 设置数据
     *
     * @param strTitle
     * @param resIdLeft
     * @param strLeft
     * @param resIdRight
     * @param strRight
     * @param listener
     */
    public void setData(String strTitle, int resIdLeft, String strLeft, int resIdRight, String strRight, final ActionBarClickListener listener) {
        if (!TextUtils.isEmpty(strTitle)) {
            tvTitle.setText(strTitle);
        } else {
            tvTitle.setVisibility(View.GONE);
        }
        if (!TextUtils.isEmpty(strLeft)) {
            tvLeft.setText(strLeft);
            tvLeft.setVisibility(View.VISIBLE);
        } else {
            tvLeft.setVisibility(View.GONE);
        }
        if (!TextUtils.isEmpty(strRight)) {
            tvRight.setText(strRight);
            tvRight.setVisibility(View.VISIBLE);
        } else {
            tvRight.setVisibility(View.GONE);
        }

        if (resIdLeft == 0) {
            iconLeft.setVisibility(View.GONE);
        } else {
            iconLeft.setBackgroundResource(resIdLeft);
            iconLeft.setVisibility(View.VISIBLE);
        }

        if (resIdRight == 0) {
            iconRight.setVisibility(View.GONE);
        } else {
            iconRight.setBackgroundResource(resIdRight);
            iconRight.setVisibility(View.VISIBLE);
        }

        if (listener != null) {
            layLeft = findViewById(R.id.lay_actionbar_left);
            layRight = findViewById(R.id.lay_actionbar_right);
            layLeft.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    listener.onLeftClick();
                }
            });
            layRight.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    listener.onRightClick();
                }
            });
        }
    }

}

下面是actionbar_trans.xml的代码

    android:id="@+id/lay_transroot"
    android:layout_
    android:layout_
    android:background="@color/colorPrimary"
    android:orientation="vertical">

            android:id="@+id/v_statusbar"
        android:layout_
        android:layout_ />

            android:layout_
        android:layout_
        android:orientation="vertical">

                    android:id="@+id/lay_actionbar_left"
            android:layout_
            android:layout_
            android:orientation="horizontal">

                            android:id="@+id/iv_actionbar_left"
                android:layout_
                android:layout_
                android:layout_centerVertical="true"
                android:layout_marginLeft="10dp"
                android:background="@mipmap/ic_left_light"
                android:visibility="gone" />

                            android:id="@+id/tv_actionbar_left"
                
                android:layout_
                android:layout_marginLeft="10dp"
                android:layout_toRightOf="@+id/iv_actionbar_left"
                android:gravity="center_vertical"
                android:maxLength="2"
                android:singleLine="true"
                android:text="返回"
                android:visibility="gone" />
        

                    android:id="@+id/tv_actionbar_title"
            
            android:layout_centerInParent="true"
            android:text="标题"
            android:textSize="16sp" />

                    android:id="@+id/lay_actionbar_right"
            android:layout_
            android:layout_
            android:layout_alignParentRight="true"
            android:gravity="right"
            android:orientation="horizontal">

                            android:id="@+id/v_actionbar_right"
                android:layout_
                android:layout_
                android:layout_alignParentRight="true"
                android:layout_centerVertical="true"
                android:layout_marginRight="10dp"
                android:visibility="gone" />

                            android:id="@+id/tv_actionbar_right"
                
                android:layout_
                android:layout_marginRight="10dp"
                android:layout_toLeftOf="@+id/v_actionbar_right"
                android:gravity="center_vertical|right"
                android:singleLine="true"
                android:visibility="gone" />
        

    

这里我即没有用到 android:fitsSystemWindows="true" 属性，也没有用到 StatusBarUtils ，因为我发现使用的时候很容易造成兼容问题。

所以，我的做法是声明了一个高度为0.0dp的 statusbar，背景为透明，然后获取状态栏高度并赋值到它上，来实现兼容。事实证明，这样做的兼容效果最好。

获取状态栏高度代码：

    /**
     * 获取状态栏高度
     *
     * @return
     */
    public int getStatusBarHeight() {
        //获取status_bar_height资源的ID
        int resourceId = getResources().getIdentifier("status_bar_height", "dimen", "android");
        if (resourceId > 0) {
            //根据资源ID获取响应的尺寸值
            return getResources().getDimensionPixelSize(resourceId);
        }
        return 0;
    }

设置 statusbar高度：

    /**
     * 设置状态栏高度
     *
     * @param statusBarHeight
     */
    public void setStatusBarHeight(int statusBarHeight) {
        ViewGroup.LayoutParams params = vStatusBar.getLayoutParams();
        params.height = statusBarHeight;
        vStatusBar.setLayoutParams(params);
    }

开启渐变：

  /**
     * 设置是否需要渐变
     */
    public void setNeedTranslucent() {
        setNeedTranslucent(true, false);
    }

    /**
     * 设置是否需要渐变,并且隐藏标题
     *
     * @param translucent
     */
    public void setNeedTranslucent(boolean translucent, boolean titleInitVisibile) {
        if (translucent) {
            layRoot.setBackgroundDrawable(null);
        }
        if (!titleInitVisibile) {
            tvTitle.setVisibility(View.GONE);
        }
    }

第三步：实现ScrollView顶部伸缩

到了这里，必须得说一下，因为是个人项目中用到，所以并没有把功能做的很强大，本人都是以最简单、有效的方式实现的。所以，代码并不像gitHub上那些被下载很多次的开源项目一样，有很高的扩展性。

时间关系，我直接贴代码吧，代码里我都写了注释的。

package test.com.widget;

import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.content.Context;
import android.graphics.Color;
import android.support.annotation.ColorInt;
import android.support.v4.graphics.ColorUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.ScrollView;

import test.com.R;
import test.com.utils.SizeUtils;

/**
 * Created by 晖仔(Milo) on 2017/2/13.
 * email:303767416@qq.com
 */

public class TranslucentScrollView extends ScrollView {

    static final String TAG = "TranslucentScrollView";

    //伸缩视图
    private View zoomView;
    //伸缩视图初始高度
    private int zoomViewInitHeight = 0;
    // 记录首次按下位置
    private float mFirstPosition = 0;
    // 是否正在放大
    private Boolean mScaling = false;

    //渐变的视图
    private View transView;
    //渐变颜色
    private int transColor = Color.WHITE;
    //渐变开始位置
    private int transStartY = 50;
    //渐变结束位置
    private int transEndY = 300;

    //渐变开始默认位置，Y轴，50dp
    private final int DFT_TRANSSTARTY = 50;
    //渐变结束默认位置，Y轴，300dp
    private final int DFT_TRANSENDY = 300;

    private TranslucentScrollView.TranslucentChangedListener translucentChangedListener;

    public interface TranslucentChangedListener {
        /**
         * 透明度变化，取值范围0-255
         *
         * @param transAlpha
         */
        void onTranslucentChanged(int transAlpha);
    }

    public TranslucentScrollView(Context context) {
        super(context);
    }

    public TranslucentScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public TranslucentScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public void setTranslucentChangedListener(TranslucentScrollView.TranslucentChangedListener translucentChangedListener) {
        this.translucentChangedListener = translucentChangedListener;
    }

    /**
     * 设置伸缩视图
     *
     * @param zoomView
     */
    public void setPullZoomView(View zoomView) {
        this.zoomView = zoomView;
        zoomViewInitHeight = zoomView.getLayoutParams().height;
        if (zoomViewInitHeight == LayoutParams.MATCH_PARENT || zoomViewInitHeight == WindowManager.LayoutParams.WRAP_CONTENT) {
            zoomView.post(new Runnable() {
                @Override
                public void run() {
                    zoomViewInitHeight = TranslucentScrollView.this.zoomView.getHeight();
                }
            });
        }
    }

    /**
     * 设置渐变视图
     *
     * @param transView 渐变的视图
     */
    public void setTransView(View transView) {
        setTransView(transView, getResources().getColor(R.color.colorPrimary), SizeUtils.dip2px(getContext(), DFT_TRANSSTARTY), SizeUtils.dip2px(getContext(), DFT_TRANSENDY));
    }

    /**
     * 设置渐变视图
     *
     * @param transView  渐变的视图
     * @param transColor 渐变颜色
     * @param transEndY  渐变结束位置
     */
    public void setTransView(View transView, @ColorInt int transColor, int transStartY, int transEndY) {
        this.transView = transView;
        //初始视图-透明
        this.transView.setBackgroundColor(ColorUtils.setAlphaComponent(transColor, 0));
        this.transStartY = transStartY;
        this.transEndY = transEndY;
        this.transColor = transColor;
        if (transStartY > transEndY) {
            throw new IllegalArgumentException("transStartY 不得大于 transEndY .. ");
        }
    }

    /**
     * 获取透明度
     *
     * @return
     */
    private int getTransAlpha() {
        float scrollY = getScrollY();
        if (transStartY != 0) {
            if (scrollY <= transStartY) {
                return 0;
            } else if (scrollY >= transEndY) {
                return 255;
            } else {
                return (int) ((scrollY - transStartY) / (transEndY - transStartY) * 255);
            }
        } else {
            if (scrollY >= transEndY) {
                return 255;
            }
            return (int) ((transEndY - scrollY) / transEndY * 255);
        }
    }

    /**
     * 重置ZoomView
     */
    private void resetZoomView() {
        final ViewGroup.LayoutParams lp = zoomView.getLayoutParams();
        final float h = zoomView.getLayoutParams().height;// ZoomView当前高度

        // 设置动画
        ValueAnimator anim = ObjectAnimator.ofFloat(0.0F, 1.0F).setDuration(200);

        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                float cVal = (Float) animation.getAnimatedValue();
                lp.height = (int) (h - (h - zoomViewInitHeight) * cVal);
                zoomView.setLayoutParams(lp);
            }
        });
        anim.start();
    }

    @Override
    protected void onScrollChanged(int l, int t, int oldl, int oldt) {
        super.onScrollChanged(l, t, oldl, oldt);
        int transAlpha = getTransAlpha();

        if (transView != null) {
            Log.d(TAG, "[onScrollChanged .. in ], 透明度 == " + transAlpha);
            transView.setBackgroundColor(ColorUtils.setAlphaComponent(transColor, transAlpha));
        }
        if (translucentChangedListener != null) {
            translucentChangedListener.onTranslucentChanged(transAlpha);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (zoomView != null) {
            ViewGroup.LayoutParams params = zoomView.getLayoutParams();
            switch (event.getAction()) {
                case MotionEvent.ACTION_UP:
                    //手指离开后恢复图片
                    mScaling = false;
                    resetZoomView();
                    break;
                case MotionEvent.ACTION_MOVE:
                    if (!mScaling) {
                        if (getScrollY() == 0) {
                            mFirstPosition = event.getY();
                        } else {
                            break;
                        }
                    }

                    int distance = (int) ((event.getY() - mFirstPosition) * 0.6);
                    if (distance <0) {
                        break;
                    }
                    mScaling = true;
                    params.height = zoomViewInitHeight + distance;

                    Log.d(TAG, "params.height == " + params.height + ", zoomViewInitHeight == " + zoomViewInitHeight + ", distance == " + distance);
                    zoomView.setLayoutParams(params);
                    return true;
            }
        }

        return super.onTouchEvent(event);
    }

}

如有问题，欢迎留言。

 

资源CSDN下载地址：还没上传，要等一下。

资源GitHub下载地址：https://github.com/yanjunhui2014/TranslucentScrollView

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