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AppBar控件的使用方式

AppBar作为Android5.0的重要动画效果, 非常绚丽的UI, 通过内容驱动, 可以减少页面的访问, 更加便捷的传递主题思想. 那么我们看看如何使用.

本文源码的GitHub 下载地址

AppBar控件的使用方式

配置

创建一个Navigation Drawer的工程, 修改主题颜色.

<resources>
<color name="colorPrimary">#FF1493</color>
<color name="colorPrimaryDark">#FF1493</color>
<color name="colorAccent">#FF4081</color>
</resources>

修改抽屉的渐变颜色side_nav_bar.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >

<gradient
android:startColor="#FF34"
android:centerColor="#FF3E96"
android:endColor="#FF1493"
android:type="linear"
android:angle="135"/>

</shape>

ViewPager

修改app_bar_main.xml, 在CoordinatorLayout中添加ViewPager.

<android.support.v4.view.ViewPager
android:id="@+id/main_vp_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

设置ViewPager的Fragment内容

/**
* 简单的Fragment
* <p/>
* Created by wangchenlong on 15/11/9.
*/

public class SimpleFragment extends Fragment {
private static final String ARG_SELECTION_NUM = "arg_selection_num";

@Bind(R.id.main_tv_text) TextView mTvText;

public SimpleFragment() {
}

public static SimpleFragment newInstance(int selectionNum) {
SimpleFragment simpleFragment = new SimpleFragment();
Bundle args = new Bundle();
args.putInt(ARG_SELECTION_NUM, selectionNum);
simpleFragment.setArguments(args);
return simpleFragment;
}


@Nullable @Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_main, container, false);

ButterKnife.bind(this, view);
return view;
}

@Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mTvText.setText("Page " + String.valueOf(getArguments().getInt(ARG_SELECTION_NUM)));
}

@Override public void onDestroyView() {
super.onDestroyView();
ButterKnife.unbind(this);
}
}

设置ViewPager的适配器

/**
* ViewPager的适配器
* <p/>
* Created by wangchenlong on 15/11/9.
*/

public class SimpleAdapter extends FragmentPagerAdapter {

private static final String[] TITLE = {"SELECTION 1", "SELECTION 2", "SELECTION 3"};

public SimpleAdapter(FragmentManager fm) {
super(fm);
}

@Override public Fragment getItem(int position) {
return SimpleFragment.newInstance(position + 1);
}

@Override public int getCount() {
return TITLE.length;
}

@Override public CharSequence getPageTitle(int position) {
if (position >= 0 && position < TITLE.length) {
return TITLE[position];
}
return null;
}
}

在MainActivity中添加ViewPager逻辑

mVpContainer.setAdapter(new SimpleAdapter(getSupportFragmentManager()));

AppBarLayout

修改AppBarLayout, 添加CollapsingToolbarLayout.

<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fitsSystemWindows="true"
android:theme="@style/AppTheme.AppBarOverlay">


<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="400dp"
android:fitsSystemWindows="true"
app:contentScrim="?attr/colorPrimary"
app:expandedTitleMarginStart="16dp"
app:expandedTitleMarginEnd="16dp"
app:layout_scrollFlags="scroll|exitUntilCollapsed">


<ImageView
android:id="@+id/toolbar_iv_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:contentDescription="@null"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="@drawable/taeyeon"
app:layout_collapseMode="parallax"/>


<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
app:popupTheme="@style/AppTheme.PopupOverlay"/>


</android.support.design.widget.CollapsingToolbarLayout>

删除Toolbar的background颜色, 避免Toolbar挡住图片;

AppBarLayout设置 fitsSystemWindows 覆盖StatusBar背景;

CollapsingToolbarLayout包含图片和Toolbar.

TabLayout

在AppBarLayout中, 添加TabLayout

<android.support.design.widget.TabLayout
android:id="@+id/toolbar_tl_tab"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_gravity="bottom"
app:layout_scrollFlags="scroll"/>

TabLayout添加 layout_scrollFlags 确保滑动.

把ViewPager加入TabLayout

mTlTab.setupWithViewPager(mVpContainer);

基本功能已经完成, 再添加随着页面切换AppBarLayout的图片视图.

渐变效果

在图片视图中, 再添加一层图片, 模拟渐变动画.

<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax">


<ImageView
android:id="@+id/toolbar_iv_outgoing"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:contentDescription="@null"
android:scaleType="centerCrop"
android:visibility="gone"/>


<ImageView
android:id="@+id/toolbar_iv_image"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:adjustViewBounds="true"
android:contentDescription="@null"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="@drawable/tiffany"
app:layout_collapseMode="parallax"/>

</FrameLayout>

修改Adapter, 为每个页面添加一个图片

/**
* ViewPager的适配器
* <p/>
* Created by wangchenlong on 15/11/9.
*/

public class SimpleAdapter extends FragmentPagerAdapter {

private static final Section[] SECTIONS = {
new Section("Tiffany", R.drawable.tiffany),
new Section("Taeyeon", R.drawable.taeyeon),
new Section("Yoona", R.drawable.yoona)
};

public SimpleAdapter(FragmentManager fm) {
super(fm);
}

@Override public Fragment getItem(int position) {
return SimpleFragment.newInstance(position + 1);
}

@Override public int getCount() {
return SECTIONS.length;
}

@Override public CharSequence getPageTitle(int position) {
if (position >= 0 && position < SECTIONS.length) {
return SECTIONS[position].getTitle();
}
return null;
}

@DrawableRes
public int getDrawable(int position) {
if (position >= 0 && position < SECTIONS.length) {
return SECTIONS[position].getDrawable();
}
return -1;
}

private static final class Section {
private final String mTitle; // 标题
@DrawableRes private final int mDrawable; // 图片

public Section(String title, int drawable) {
mTitle = title;
mDrawable = drawable;
}

public String getTitle() {
return mTitle;
}

public int getDrawable() {
return mDrawable;
}
}
}

两个图像页面的渐变动画

/**
* 渐变的动画效果
* <p/>
* Created by wangchenlong on 15/11/9.
*/

public class ImageAnimator {

private final SimpleAdapter mAdapter; // 适配器
private final ImageView mTargetImage; // 原始图片
private final ImageView mOutgoingImage; // 渐变图片

private int mActualStart; // 实际起始位置

public ImageAnimator(SimpleAdapter adapter, ImageView targetImage, ImageView outgoingImage) {
mAdapter = adapter;
mTargetImage = targetImage;
mOutgoingImage = outgoingImage;
}

/**
* 启动动画, 之后选择向前或向后滑动
*
* @param startPosition 起始位置
* @param endPosition 终止位置
*/

public void start(int startPosition, int endPosition) {
mActualStart = startPosition;

// 终止位置的图片
@DrawableRes int incomeId = mAdapter.getDrawable(endPosition);

// 原始图片
mOutgoingImage.setImageDrawable(mTargetImage.getDrawable()); // 原始的图片
mOutgoingImage.setVisibility(View.VISIBLE);
mOutgoingImage.setAlpha(1.0f);

// 目标图片
mTargetImage.setImageResource(incomeId);
}

/**
* 滑动结束的动画效果
*
* @param endPosition 滑动位置
*/

public void end(int endPosition) {
@DrawableRes int incomeId = mAdapter.getDrawable(endPosition);
mTargetImage.setTranslationX(0f);

// 设置原始图片
if (endPosition == mActualStart) {
mTargetImage.setImageDrawable(mOutgoingImage.getDrawable());
} else {
mTargetImage.setImageResource(incomeId);
mTargetImage.setAlpha(1f);
mOutgoingImage.setVisibility(View.GONE);
}
}

// 向后滚动, 比如0->1, offset滚动的距离(0->1), 目标渐渐淡出
public void forward(float positionOffset) {
mTargetImage.setAlpha(positionOffset);
}

// 向前滚动, 比如1->0, offset滚动的距离(1->0), 目标渐渐淡出
public void backwards(float positionOffset) {
mTargetImage.setAlpha(1 - positionOffset);
}
}

注释已经写的很详细了, 注意的是向前向后滑动, position的值不同. 向前滑动, position的值是当前值减一; 向后滑动, position的值不变. 也就是说, position总是较小值. 偏移量, 向后滑动时, 从0至1; 向前滑动时, 从1至0.

ViewPager的监听, 使用动画效果

/**
* ViewPager滑动页面监听
* <p/>
* Created by wangchenlong on 15/11/9.
*/

public class PagerChangeListener implements ViewPager.OnPageChangeListener {
private ImageAnimator mImageAnimator;

private int mCurrentPosition;

private int mFinalPosition;

private boolean mIsScrolling = false;

public PagerChangeListener(ImageAnimator imageAnimator) {
mImageAnimator = imageAnimator;
}

public static PagerChangeListener newInstance(SimpleAdapter adapter, ImageView originImage, ImageView outgoingImage) {
ImageAnimator imageAnimator = new ImageAnimator(adapter, originImage, outgoingImage);
return new PagerChangeListener(imageAnimator);
}

/**
* 滑动监听
*
* @param position 当前位置
* @param positionOffset 偏移[当前值+-1]
* @param positionOffsetPixels 偏移像素
*/

@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

Log.e("DEBUG-WCL", "position: " + position + ", positionOffset: " + positionOffset);

// 以前滑动, 现在终止
if (isFinishedScrolling(position, positionOffset)) {
finishScroll(position);
}

// 判断前后滑动
if (isStartingScrollToPrevious(position, positionOffset)) {
startScroll(position);
} else if (isStartingScrollToNext(position, positionOffset)) {
startScroll(position + 1); // 向后滚动需要加1
}

// 向后滚动
if (isScrollingToNext(position, positionOffset)) {
mImageAnimator.forward(positionOffset);
} else if (isScrollingToPrevious(position, positionOffset)) { // 向前滚动
mImageAnimator.backwards(positionOffset);
}
}

/**
* 终止滑动
* 滑动 && [偏移是0&&滑动终点] || 动画之中
*
* @param position 位置
* @param positionOffset 偏移量
* @return 终止滑动
*/

public boolean isFinishedScrolling(int position, float positionOffset) {
return mIsScrolling && (positionOffset == 0f && position == mFinalPosition);
}

/**
* 从静止到开始滑动, 下一个
* 未滑动 && 位置是当前位置 && 偏移量不是0
*
* @param position 位置
* @param positionOffset 偏移量
* @return 是否
*/

private boolean isStartingScrollToNext(int position, float positionOffset) {
return !mIsScrolling && position == mCurrentPosition && positionOffset != 0f;
}

/**
* 从静止到开始滑动, 前一个[position会-1]
*
* @param position 位置
* @param positionOffset 偏移量
* @return 是否
*/

private boolean isStartingScrollToPrevious(int position, float positionOffset) {
return !mIsScrolling && position != mCurrentPosition && positionOffset != 0f;
}

/**
* 开始滚动, 向后
*
* @param position 位置
* @param positionOffset 偏移
* @return 是否
*/

private boolean isScrollingToNext(int position, float positionOffset) {
return mIsScrolling && position == mCurrentPosition && positionOffset != 0f;
}

/**
* 开始滚动, 向前
*
* @param position 位置
* @param positionOffset 偏移
* @return 是否
*/

private boolean isScrollingToPrevious(int position, float positionOffset) {
return mIsScrolling && position != mCurrentPosition && positionOffset != 0f;
}

/**
* 开始滑动
* 滚动开始, 结束位置是position[前滚时position会自动减一], 动画从当前位置到结束位置.
*
* @param position 滚动结束之后的位置
*/

private void startScroll(int position) {
mIsScrolling = true;
mFinalPosition = position;

// 开始滚动动画
mImageAnimator.start(mCurrentPosition, position);
}

/**
* 如果正在滚动, 结束时, 固定position位置, 停止滚动, 调动截止动画
*
* @param position 位置
*/

private void finishScroll(int position) {
if (mIsScrolling) {
mCurrentPosition = position;
mIsScrolling = false;
mImageAnimator.end(position);
}
}

@Override
public void onPageScrollStateChanged(int state) {
//NO-OP
}

@Override
public void onPageSelected(int position) {
if (!mIsScrolling) {
mIsScrolling = true;
mFinalPosition = position;
mImageAnimator.start(mCurrentPosition, position);
}
}
}

详细内容参见注释

ViewPager添加滚动监听.

SimpleAdapter adapter = new SimpleAdapter(getSupportFragmentManager());
mVpContainer.setAdapter(adapter);
mVpContainer.addOnPageChangeListener(PagerChangeListener.newInstance(adapter, mIvTarget, mIvOutgoing));

页面滚动

在ViewPager上, 嵌套NestedScrollView.

<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true"
android:scrollbars="none"
app:layout_behavior="@string/appbar_scrolling_view_behavior">


<android.support.v4.view.ViewPager
android:id="@+id/main_vp_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>


</android.support.v4.widget.NestedScrollView>

android:fillViewport 允许ScrollView内的组件填充, 否则ViewPager显示.

设置标题, MainActivity.

setTitle("Girls' Generation");

动画效果

AppBar控件的使用方式

偏移滚动

额, 与其说是AppBar, 不如说是ViewPager, 再添加一些动画效果, 和修复Bug.

把图片的左右10%, 隐藏起来, 滑动时, 一边渐变一边侧移.

app_bar_main 中, 替换 FrameLayoutPercentFrameLayout , 宽度设置为 120% .

<android.support.percent.PercentFrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:fitsSystemWindows="true"
app:layout_collapseMode="parallax">


<ImageView
android:id="@+id/toolbar_iv_outgoing"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:adjustViewBounds="true"
android:contentDescription="@null"
android:scaleType="centerCrop"
android:visibility="gone"
app:layout_widthPercent="120%"/>


<ImageView
android:id="@+id/toolbar_iv_target"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:adjustViewBounds="true"
android:contentDescription="@null"
android:fitsSystemWindows="true"
android:scaleType="centerCrop"
android:src="@drawable/tiffany"
app:layout_collapseMode="parallax"
app:layout_widthPercent="120%"/>


</android.support.percent.PercentFrameLayout>

修改滑动动画(Image), 在向前向后滑动时, setTranslationX X轴平移.

/**
* 渐变的动画效果
* <p/>
* Created by wangchenlong on 15/11/9.
*/

public class ImageAnimator {

private static final float FACTOR = 0.1f;

private final SimpleAdapter mAdapter; // 适配器
private final ImageView mTargetImage; // 原始图片
private final ImageView mOutgoingImage; // 渐变图片

private int mActualStart; // 实际起始位置

private int mStart;
private int mEnd;

public ImageAnimator(SimpleAdapter adapter, ImageView targetImage, ImageView outgoingImage) {
mAdapter = adapter;
mTargetImage = targetImage;
mOutgoingImage = outgoingImage;
}

/**
* 启动动画, 之后选择向前或向后滑动
*
* @param startPosition 起始位置
* @param endPosition 终止位置
*/

public void start(int startPosition, int endPosition) {
mActualStart = startPosition;

// 终止位置的图片
@DrawableRes int incomeId = mAdapter.getDrawable(endPosition);

// 原始图片
mOutgoingImage.setImageDrawable(mTargetImage.getDrawable()); // 原始的图片

// 起始图片
mOutgoingImage.setTranslationX(0f);

mOutgoingImage.setVisibility(View.VISIBLE);
mOutgoingImage.setAlpha(1.0f);

// 目标图片
mTargetImage.setImageResource(incomeId);

mStart = Math.min(startPosition, endPosition);
mEnd = Math.max(startPosition, endPosition);
}

/**
* 滑动结束的动画效果
*
* @param endPosition 滑动位置
*/

public void end(int endPosition) {
@DrawableRes int incomeId = mAdapter.getDrawable(endPosition);
mTargetImage.setTranslationX(0f);

// 设置原始图片
if (endPosition == mActualStart) {
mTargetImage.setImageDrawable(mOutgoingImage.getDrawable());
} else {
mTargetImage.setImageResource(incomeId);
mTargetImage.setAlpha(1f);
mOutgoingImage.setVisibility(View.GONE);
}
}

// 向前滚动, 比如0->1, offset滚动的距离(0->1), 目标渐渐淡出
public void forward(float positionOffset) {
Log.e("DEBUG-WCL", "forward-positionOffset: " + positionOffset);
int width = mTargetImage.getWidth();
mOutgoingImage.setTranslationX(-positionOffset * (FACTOR * width));
mTargetImage.setTranslationX((1 - positionOffset) * (FACTOR * width));

mTargetImage.setAlpha(positionOffset);
}

// 向后滚动, 比如1->0, offset滚动的距离(1->0), 目标渐渐淡入
public void backwards(float positionOffset) {
Log.e("DEBUG-WCL", "backwards-positionOffset: " + positionOffset);
int width = mTargetImage.getWidth();
mOutgoingImage.setTranslationX((1 - positionOffset) * (FACTOR * width));
mTargetImage.setTranslationX(-(positionOffset) * (FACTOR * width));

mTargetImage.setAlpha(1 - positionOffset);
}

// 判断停止
public boolean isWithin(int position) {
return position >= mStart && position < mEnd;
}
}

修复滚动Bug, 连续滚动时, 及时更新当前图片, 否则图片异常.

/**
* 终止滑动
* 滑动 && [偏移是0&&滑动终点] || 动画之中 || 未在区间即连续滚动
*
* @param position 位置
* @param positionOffset 偏移量
* @return 终止滑动
*/

public boolean isFinishedScrolling(int position, float positionOffset) {
return mIsScrolling && (positionOffset == 0f && position == mFinalPosition) || !mImageAnimator.isWithin(position);
}

全部功能都已经完成了. AppBar的知识就这些了.

OK, that’s all! Enjoy it!

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AppBar控件的使用方式

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