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

yanjunhui2011 人气:0
想了解Android沉浸式状态栏 + actionBar渐变 + scrollView顶部伸缩效果的相关内容吗，yanjunhui2011在本文为您仔细讲解Android沉浸式状态栏 + actionBar渐变 + scrollView顶部伸缩的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：android沉浸式状态栏,actionBar渐变,scrollView顶部伸缩，下面大家一起来学习吧。

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

<style name="TranslucentTheme" parent="@style/AppTheme">
</style>

values-19

<style name="TranslucentTheme" parent="@style/AppTheme">
 <item name="android:windowTranslucentStatus">true</item>
 <item name="android:windowTranslucentNavigation">false</item>
</style>

values-V21

<style name="TranslucentTheme" parent="@style/AppTheme">
 <item name="android:windowTranslucentStatus">true</item>
 <item name="android:windowTranslucentNavigation">false</item>
 <!-- v-21 中新增的属性 -->
 <item name="android:statusBarColor">@android:color/transparent</item>
</style>

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

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

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:id="@+id/lay_transroot" 
 android:layout_width="match_parent" 
 android:layout_height="wrap_content" 
 android:background="@color/colorPrimary" 
 android:orientation="vertical"> 
 <View 
  android:id="@+id/v_statusbar" 
  android:layout_width="match_parent" 
  android:layout_height="1.0dp" /> 
 <RelativeLayout 
  android:layout_width="match_parent" 
  android:layout_height="45dp" 
  android:orientation="vertical"> 
  <RelativeLayout 
   android:id="@+id/lay_actionbar_left" 
   android:layout_width="100dp" 
   android:layout_height="match_parent" 
   android:orientation="horizontal"> 
   <ImageView 
    android:id="@+id/iv_actionbar_left" 
    android:layout_width="20dp" 
    android:layout_height="20dp" 
    android:layout_centerVertical="true" 
    android:layout_marginLeft="10dp" 
    android:background="@mipmap/ic_left_light" 
    android:visibility="gone" /> 
   <TextView 
    android:id="@+id/tv_actionbar_left" 
    style="@style/text_white" 
    android:layout_height="match_parent" 
    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" /> 
  </RelativeLayout> 
  <TextView 
   android:id="@+id/tv_actionbar_title" 
   style="@style/text_white" 
   android:layout_centerInParent="true" 
   android:text="标题" 
   android:textSize="16sp" /> 
  <RelativeLayout 
   android:id="@+id/lay_actionbar_right" 
   android:layout_width="100dp" 
   android:layout_height="match_parent" 
   android:layout_alignParentRight="true" 
   android:gravity="right" 
   android:orientation="horizontal"> 
   <View 
    android:id="@+id/v_actionbar_right" 
    android:layout_width="20dp" 
    android:layout_height="20dp" 
    android:layout_alignParentRight="true" 
    android:layout_centerVertical="true" 
    android:layout_marginRight="10dp" 
    android:visibility="gone" /> 
   <TextView 
    android:id="@+id/tv_actionbar_right" 
    style="@style/text_white" 
    android:layout_height="match_parent" 
    android:layout_marginRight="10dp" 
    android:layout_toLeftOf="@+id/v_actionbar_right" 
    android:gravity="center_vertical|right" 
    android:singleLine="true" 
    android:visibility="gone" /> 
  </RelativeLayout> 
 </RelativeLayout> 
</LinearLayout>

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); 
 } 
}

总结

以上所述是小编给大家介绍的Android沉浸式状态栏 + actionBar渐变 + scrollView顶部伸缩，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！

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