自定义view-视察动画之酷狗音乐引导页

使用的布局使用的是GitHub：https://github.com/Cleveroad/slidingtutorial-android

第一步：添加：compile ‘com.android.support:percent:25.3.1’

第二步：布局

fragment_page_first

<?xml version="1.0" encoding="utf-8"?>
<android.support.percent.PercentRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/rootFirstPage"android:layout_width="match_parent"android:layout_height="match_parent"tools:background="@android:color/holo_orange_dark"tools:ignore="ContentDescription"><ImageView
        android:id="@+id/ivFirstImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:src="@mipmap/s_0_1"app:layout_heightPercent="35%"app:layout_widthPercent="50%"app:translationXIn="0.4"app:translationYIn="0.4"app:translationYOut="0.4"app:translationXOut="0.4" /><ImageView
        android:id="@+id/ivSecondImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentEnd="true"android:layout_alignParentRight="true"android:src="@mipmap/s_0_2"app:layout_heightPercent="10%"app:layout_marginRightPercent="12%"app:layout_marginTopPercent="27%"app:layout_widthPercent="12%"app:translationXIn="0.12"app:translationYIn="0.82"app:translationYOut="0.82"app:translationXOut="0.12" /><ImageView
        android:id="@+id/ivThirdImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_0_3"app:layout_heightPercent="25%"app:layout_marginLeftPercent="14%"app:layout_marginTopPercent="49%"app:layout_widthPercent="30%"app:translationXIn="0.16"app:translationXOut="0.16" /><ImageView
        android:id="@+id/ivFourthImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_0_4"app:layout_heightPercent="15%"app:layout_marginLeftPercent="14%"app:layout_marginTopPercent="39%"app:layout_widthPercent="20%"app:translationXIn="0.02"app:translationXOut="0.02" /><ImageView
        android:id="@+id/ivFifthImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:src="@mipmap/s_0_5"app:layout_heightPercent="15%"app:layout_marginTopPercent="22%"app:layout_widthPercent="45%"app:translationXIn="0.06"app:translationXOut="0.06" /><ImageView
        android:id="@+id/ivSixthImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_0_6"app:layout_heightPercent="6%"app:layout_marginLeftPercent="4%"app:layout_marginTopPercent="26%"app:layout_widthPercent="6%"app:translationXIn="0.18"app:translationXOut="0.18" /><ImageView
        android:id="@+id/ivSeventhImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_0_7"app:layout_heightPercent="8%"app:layout_marginLeftPercent="14%"app:layout_marginTopPercent="25%"app:layout_widthPercent="9%"app:translationXIn="0.28"app:translationXOut="0.28" /><ImageView
        android:id="@+id/ivEighthImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_0_8"app:layout_heightPercent="6%"app:layout_marginLeftPercent="77%"app:layout_marginTopPercent="38%"app:layout_widthPercent="8%"app:translationXIn="0.34"app:translationXOut="0.34" /><TextView
        android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:layout_centerHorizontal="true"android:gravity="center"android:text="@string/text_web_ceo"android:textColor="@android:color/white"android:textSize="@dimen/text_size_large"app:layout_heightPercent="15%"app:layout_marginBottomPercent="11%"app:layout_widthPercent="45%" />
</android.support.percent.PercentRelativeLayout>

fragement_page_second

<?xml version="1.0" encoding="utf-8"?>
<android.support.percent.PercentRelativeLayout
    android:id="@+id/rootSecondPage"xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:ignore="ContentDescription"tools:background="@android:color/holo_green_dark"><ImageView
        android:id="@+id/ivFirstImage"app:translationXIn="0.4"app:translationXOut="0.4"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:src="@mipmap/s_1_1"app:layout_heightPercent="25%"app:layout_widthPercent="45%"/><ImageView
        android:id="@+id/ivSecondImage"app:translationXIn="1.2"app:translationXOut="1.2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentEnd="true"android:layout_alignParentRight="true"android:alpha=".5"android:src="@mipmap/s_1_2"app:layout_heightPercent="6%"app:layout_marginRightPercent="14%"app:layout_marginTopPercent="30%"app:layout_widthPercent="19%"/><ImageView
        android:id="@+id/ivThirdImage"app:translationXIn="0.16"app:translationXOut="0.16"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_1_3"app:layout_heightPercent="8%"app:layout_marginLeftPercent="46%"app:layout_marginTopPercent="43%"app:layout_widthPercent="15%"/><ImageView
        android:id="@+id/ivFourthImage"app:translationXIn="0.2"app:translationXOut="0.2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_1_4"app:layout_heightPercent="10%"app:layout_marginLeftPercent="44%"app:layout_marginTopPercent="52%"app:layout_widthPercent="13%"/><ImageView
        app:translationXIn="0.06"app:translationXOut="0.06"android:id="@+id/ivSixthImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_1_6"app:layout_heightPercent="7%"app:layout_marginLeftPercent="20%"app:layout_marginTopPercent="47%"app:layout_widthPercent="20%"/><ImageView
        app:translationXIn="0.18"app:translationXOut="0.18"android:id="@+id/ivSeventhImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_1_7"app:layout_heightPercent="8%"app:layout_marginLeftPercent="22%"app:layout_marginTopPercent="35%"app:layout_widthPercent="17%"/><ImageView
        app:translationXIn="0.28"app:translationXOut="0.28"android:id="@+id/ivFifthImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:src="@mipmap/s_1_5"app:layout_heightPercent="10%"app:layout_marginTopPercent="33%"app:layout_widthPercent="15%"/><ImageView
        app:translationXIn="0.14"app:translationXOut="0.14"android:id="@+id/ivEighthImage"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerHorizontal="true"android:src="@mipmap/s_1_8"app:layout_heightPercent="10%"app:layout_marginTopPercent="22%"app:layout_widthPercent="25%"/><TextView
        android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:layout_centerHorizontal="true"android:gravity="center"android:text="@string/text_web_dev"android:textColor="@android:color/white"android:textSize="@dimen/text_size_large"app:layout_heightPercent="15%"app:layout_marginBottomPercent="11%"app:layout_widthPercent="45%"/>
</android.support.percent.PercentRelativeLayout>

fragment_page_third

<?xml version="1.0" encoding="utf-8"?>
<android.support.percent.PercentRelativeLayout
    android:id="@+id/rootThirdPage"xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:ignore="ContentDescription"tools:background="@android:color/holo_blue_dark"><ImageView
        android:id="@+id/ivThirdImage"app:translationXIn="0.4"app:translationXOut="0.4"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_2_3"app:layout_heightPercent="40%"app:layout_marginTopPercent="27%"app:layout_widthPercent="100%"/><ImageView
        android:id="@+id/ivSecondImage"app:translationXIn="0.12"app:translationXOut="0.12"android:layout_width="wrap_content"android:layout_height="wrap_content"android:alpha=".5"android:src="@mipmap/s_2_2"app:layout_heightPercent="27%"app:layout_marginLeftPercent="20%"app:layout_marginRightPercent="12%"app:layout_marginTopPercent="20%"app:layout_widthPercent="75%"/><ImageView
        android:id="@+id/ivFirstImage"app:translationXIn="0.16"app:translationXOut="0.16"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerInParent="true"android:src="@mipmap/s_2_1"app:layout_heightPercent="18%"app:layout_widthPercent="55%"/><ImageView
        android:id="@+id/ivFourthImage"app:translationXIn="0.2"app:translationXOut="0.2"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_2_4"app:layout_heightPercent="7%"app:layout_marginLeftPercent="33%"app:layout_marginTopPercent="34%"app:layout_widthPercent="16%"/><ImageView
        android:id="@+id/ivSixthImage"app:translationXIn="0.06"app:translationXOut="0.06"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_2_6"app:layout_heightPercent="7%"app:layout_marginLeftPercent="57%"app:layout_marginTopPercent="29%"app:layout_widthPercent="14%"/><ImageView
        android:id="@+id/ivSeventhImage"app:translationXIn="0.18"app:translationXOut="0.18"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_2_7"app:layout_heightPercent="15%"app:layout_marginLeftPercent="65%"app:layout_marginTopPercent="47%"app:layout_widthPercent="25%"/><ImageView
        android:id="@+id/ivFifthImage"app:translationXIn="0.28"app:translationXOut="0.28"android:layout_width="wrap_content"android:layout_height="wrap_content"android:src="@mipmap/s_2_5"app:layout_heightPercent="10%"app:layout_marginLeftPercent="77%"app:layout_marginTopPercent="30%"app:layout_widthPercent="15%"/><TextView
        android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:layout_centerHorizontal="true"android:gravity="center"android:text="@string/text_e_commerce"android:textColor="@android:color/white"android:textSize="@dimen/text_size_large"app:layout_heightPercent="15%"app:layout_marginBottomPercent="11%"app:layout_widthPercent="45%"/>
</android.support.percent.PercentRelativeLayout>

activity_main

<?xml version="1.0" encoding="utf-8"?>
<com.hbwj.a19_.animation.ParallaxViewPager xmlns:android="http://schemas.android.com/apk/res/android"xmlns:app="http://schemas.android.com/apk/res-auto"xmlns:tools="http://schemas.android.com/tools"android:id="@+id/parallax_vp"android:layout_width="match_parent"android:background="@android:color/holo_orange_dark"android:layout_height="match_parent"tools:context=".MainActivity"/>

ParallaxViewPager:自定义viewPager

public class ParallaxViewPager extends ViewPager {private List<ParallaxFragment> mFragments;public ParallaxViewPager(Context context) {this(context, null);}public ParallaxViewPager(Context context, AttributeSet attrs) {super(context, attrs);mFragments = new ArrayList<>();}public void setLayout(FragmentManager fm, int[] layoutIds) {mFragments.clear();for (int layoutId : layoutIds) {ParallaxFragment fragment = new ParallaxFragment();Bundle bundle = new Bundle();bundle.putInt(fragment.LAYOUT_ID_KEY, layoutId);fragment.setArguments(bundle);mFragments.add(fragment);}// 设置我们的 ViewPager 的AdaptersetAdapter(new ParallaxPagerAdapter(fm));//设置事件addOnPageChangeListener(new OnPageChangeListener() {@Overridepublic void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {// 滚动  position 当前位置    positionOffset 0-1     positionOffsetPixels 0-屏幕的宽度pxLog.e("TAG", "position->" + position + " positionOffset->" + positionOffset + " positionOffsetPixels->" + positionOffsetPixels);//获得属性//左边出去，右边进来ParallaxFragment outFragment = mFragments.get(position);List<View> parallaxViews = outFragment.getParallaxViews();for (View parallaxView : parallaxViews) {ParallaxTag tag = (ParallaxTag) parallaxView.getTag(R.id.parallax_tag);parallaxView.setTranslationX(-positionOffsetPixels * tag.translationXOut);parallaxView.setTranslationY(-positionOffsetPixels * tag.translationYOut);}try {//从右边进来ParallaxFragment inFramgent = mFragments.get(position + 1);List<View> inParallaxViews = inFramgent.getParallaxViews();for (View parallaxView : inParallaxViews) {ParallaxTag tag = (ParallaxTag) parallaxView.getTag(R.id.parallax_tag);parallaxView.setTranslationX((getMeasuredWidth() - positionOffsetPixels) * tag.translationXIn);parallaxView.setTranslationY((getMeasuredWidth() - positionOffsetPixels) * tag.translationYIn);}} catch (Exception e) {e.printStackTrace();}}@Overridepublic void onPageSelected(int position) {//页面切换完毕}@Overridepublic void onPageScrollStateChanged(int state) {}});}private class ParallaxPagerAdapter extends FragmentPagerAdapter {public ParallaxPagerAdapter(FragmentManager fm) {super(fm);}@Overridepublic Fragment getItem(int position) {return mFragments.get(position);}@Overridepublic int getCount() {return mFragments.size();}}}

ParallaxFragment：View拦截解析属性

public class ParallaxFragment extends Fragment implements LayoutInflaterFactory {public static final String LAYOUT_ID_KEY = "LAYOUT_ID_KEY";private CompatViewInflater mAppCompatViewInflater;private static final boolean IS_PRE_LOLLIPOP = Build.VERSION.SDK_INT < 21;private int[] mParallaxAttrs = new int[]{R.attr.translationXIn,R.attr.translationXOut, R.attr.translationYIn, R.attr.translationYOut};// 存放所有的需要位移的Viewprivate List<View> mParallaxViews = new ArrayList<>();@Nullable@Overridepublic View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {int layoutId = getArguments().getInt(LAYOUT_ID_KEY);// View创建的时候 我们去解析属性  这里传 inflater 有没有问题？// 单例设计模式 代表着所有的View的创建都会是该 Fragment 去创建的inflater = inflater.cloneInContext(getContext());//克隆一个LayoutInflaterCompat.setFactory(inflater, this);return inflater.inflate(layoutId, container, false);}// View都会来这里,创建View// 拦截到View的创建  获取View之后要去解析// 1. 创建View@Overridepublic View onCreateView(View parent, String name, Context context, AttributeSet attrs) {//View都会来这里，创建view// First let the Activity's Factory try and inflate the view// First let the Activity's Factory try and inflate the viewView view = createView(parent, name, context, attrs);if (view != null) {//解析属性analysisAttrs(view,context,attrs);}// If the Factory didn't handle it, let our createView() method tryreturn view;}/*** 解析属性*/private void analysisAttrs(View view, Context context, AttributeSet attrs) {TypedArray array=context.obtainStyledAttributes(attrs,mParallaxAttrs);if(array!=null&&array.getIndexCount()!=0){/*  float xIn =attar.getFloat(0,0f);float xOut  =attar.getFloat(1,0f);float yIn  =attar.getFloat(2,0f);float yOut=attar.getFloat(3,0f);*/int n = array.getIndexCount();ParallaxTag tag=new ParallaxTag();for (int i = 0; i < n; i++) {int attr = array.getIndex(i);switch (attr) {case 0:tag.translationXIn = array.getFloat(attr,0f);break;case 1:tag.translationXOut = array.getFloat(attr,0f);break;case 2:tag.translationYIn = array.getFloat(attr,0f);break;case 3:tag.translationYOut = array.getFloat(attr,0f);break;}}//保存自定义viewview.setTag(R.id.parallax_tag,tag);//Log.e("TAG",tag.toString());mParallaxViews.add(view);}array.recycle();}public View createView(View parent, final String name, @NonNull Context context,@NonNull AttributeSet attrs) {if (mAppCompatViewInflater == null) {mAppCompatViewInflater = new CompatViewInflater();}boolean inheritContext = (attrs instanceof XmlPullParser)// If we have a XmlPullParser, we can detect where we are in the layout? ((XmlPullParser) attrs).getDepth() > 1// Otherwise we have to use the old heuristic: shouldInheritContext((ViewParent) parent);return mAppCompatViewInflater.createView(parent, name, context, attrs, inheritContext,IS_PRE_LOLLIPOP, /* Only read android:theme pre-L (L+ handles this anyway) */true, /* Read read app:theme as a fallback at all times for legacy reasons */VectorEnabledTintResources.shouldBeUsed() /* Only tint wrap the context if enabled */);}private boolean shouldInheritContext(ViewParent parent) {if (parent == null) {// The initial parent is null so just return falsereturn false;}while (true) {if (parent == null) {// Bingo. We've hit a view which has a null parent before being terminated from// the loop. This is (most probably) because it's the root view in an inflation// call, therefore we should inherit. This works as the inflated layout is only// added to the hierarchy at the end of the inflate() call.return true;} else if (!(parent instanceof View)|| ViewCompat.isAttachedToWindow((View) parent)) {// We have either hit the window's decor view, a parent which isn't a View// (i.e. ViewRootImpl), or an attached view, so we know that the original parent// is currently added to the view hierarchy. This means that it has not be// inflated in the current inflate() call and we should not inherit the context.return false;}parent = parent.getParent();}}//获得所有属性public List<View> getParallaxViews() {return mParallaxViews;}
}

CompatViewInflater：参考系统源码

public class CompatViewInflater {private static final Class<?>[] sConstructorSignature = new Class[]{Context.class, AttributeSet.class};private static final String LOG_TAG = "AppCompatViewInflater";private final Object[] mConstructorArgs = new Object[2];private static final Map<String, Constructor<? extends View>> sConstructorMap= new ArrayMap<>();private static final int[] sOnClickAttrs = new int[]{android.R.attr.onClick};public final View createView(View parent, final String name, @NonNull Context context,@NonNull AttributeSet attrs, boolean inheritContext,boolean readAndroidTheme, boolean readAppTheme, boolean wrapContext) {final Context originalContext = context;// We can emulate Lollipop's android:theme attribute propagating down the view hierarchy// by using the parent's contextif (inheritContext && parent != null) {context = parent.getContext();}if (readAndroidTheme || readAppTheme) {// We then apply the theme on the context, if specifiedcontext = themifyContext(context, attrs, readAndroidTheme, readAppTheme);}if (wrapContext) {context = TintContextWrapper.wrap(context);}View view = null;// We need to 'inject' our tint aware Views in place of the standard framework versionsswitch (name) {case "TextView":view = new AppCompatTextView(context, attrs);break;case "ImageView":view = new AppCompatImageView(context, attrs);break;case "Button":view = new AppCompatButton(context, attrs);break;case "EditText":view = new AppCompatEditText(context, attrs);break;case "Spinner":view = new AppCompatSpinner(context, attrs);break;case "ImageButton":view = new AppCompatImageButton(context, attrs);break;case "CheckBox":view = new AppCompatCheckBox(context, attrs);break;case "RadioButton":view = new AppCompatRadioButton(context, attrs);break;case "CheckedTextView":view = new AppCompatCheckedTextView(context, attrs);break;case "AutoCompleteTextView":view = new AppCompatAutoCompleteTextView(context, attrs);break;case "MultiAutoCompleteTextView":view = new AppCompatMultiAutoCompleteTextView(context, attrs);break;case "RatingBar":view = new AppCompatRatingBar(context, attrs);break;case "SeekBar":view = new AppCompatSeekBar(context, attrs);break;}if (view == null && originalContext != context) {// If the original context does not equal our themed context, then we need to manually// inflate it using the name so that android:theme takes effect.view = createViewFromTag(context, name, attrs);}if (view != null) {// If we have created a view, check it's android:onClickcheckOnClickListener(view, attrs);}return view;}private static Context themifyContext(Context context, AttributeSet attrs,boolean useAndroidTheme, boolean useAppTheme) {final TypedArray a = context.obtainStyledAttributes(attrs, android.support.v7.appcompat.R.styleable.View, 0, 0);int themeId = 0;if (useAndroidTheme) {// First try reading android:theme if enabledthemeId = a.getResourceId(android.support.v7.appcompat.R.styleable.View_android_theme, 0);}if (useAppTheme && themeId == 0) {// ...if that didn't work, try reading app:theme (for legacy reasons) if enabledthemeId = a.getResourceId(android.support.v7.appcompat.R.styleable.View_theme, 0);if (themeId != 0) {Log.i(LOG_TAG, "app:theme is now deprecated. "+ "Please move to using android:theme instead.");}}a.recycle();if (themeId != 0 && (!(context instanceof ContextThemeWrapper)|| ((ContextThemeWrapper) context).getThemeResId() != themeId)) {// If the context isn't a ContextThemeWrapper, or it is but does not have// the same theme as we need, wrap it in a new wrappercontext = new ContextThemeWrapper(context, themeId);}return context;}private View createViewFromTag(Context context, String name, AttributeSet attrs) {if (name.equals("view")) {name = attrs.getAttributeValue(null, "class");}try {mConstructorArgs[0] = context;mConstructorArgs[1] = attrs;if (-1 == name.indexOf('.')) {// try the android.widget prefix first...return createView(context, name, "android.widget.");} else {return createView(context, name, null);}} catch (Exception e) {// We do not want to catch these, lets return null and let the actual LayoutInflater// tryreturn null;} finally {// Don't retain references on context.mConstructorArgs[0] = null;mConstructorArgs[1] = null;}}private void checkOnClickListener(View view, AttributeSet attrs) {final Context context = view.getContext();if (!(context instanceof ContextWrapper) ||(Build.VERSION.SDK_INT >= 15 && !ViewCompat.hasOnClickListeners(view))) {// Skip our compat functionality if: the Context isn't a ContextWrapper, or// the view doesn't have an OnClickListener (we can only rely on this on API 15+ so// always use our compat code on older devices)return;}final TypedArray a = context.obtainStyledAttributes(attrs, sOnClickAttrs);final String handlerName = a.getString(0);if (handlerName != null) {view.setOnClickListener(new DeclaredOnClickListener(view, handlerName));}a.recycle();}private View createView(Context context, String name, String prefix)throws ClassNotFoundException, InflateException {Constructor<? extends View> constructor = sConstructorMap.get(name);try {if (constructor == null) {// Class not found in the cache, see if it's real, and try to add itClass<? extends View> clazz = context.getClassLoader().loadClass(prefix != null ? (prefix + name) : name).asSubclass(View.class);constructor = clazz.getConstructor(sConstructorSignature);sConstructorMap.put(name, constructor);}constructor.setAccessible(true);return constructor.newInstance(mConstructorArgs);} catch (Exception e) {// We do not want to catch these, lets return null and let the actual LayoutInflater// tryreturn null;}}private static class DeclaredOnClickListener implements View.OnClickListener {private final View mHostView;private final String mMethodName;private Method mResolvedMethod;private Context mResolvedContext;public DeclaredOnClickListener(@NonNull View hostView, @NonNull String methodName) {mHostView = hostView;mMethodName = methodName;}@Overridepublic void onClick(@NonNull View v) {if (mResolvedMethod == null) {resolveMethod(mHostView.getContext(), mMethodName);}try {mResolvedMethod.invoke(mResolvedContext, v);} catch (IllegalAccessException e) {throw new IllegalStateException("Could not execute non-public method for android:onClick", e);} catch (InvocationTargetException e) {throw new IllegalStateException("Could not execute method for android:onClick", e);}}@NonNullprivate void resolveMethod(@Nullable Context context, @NonNull String name) {while (context != null) {try {if (!context.isRestricted()) {final Method method = context.getClass().getMethod(mMethodName, View.class);if (method != null) {mResolvedMethod = method;mResolvedContext = context;return;}}} catch (NoSuchMethodException e) {// Failed to find method, keep searching up the hierarchy.}if (context instanceof ContextWrapper) {context = ((ContextWrapper) context).getBaseContext();} else {// Can't search up the hierarchy, null out and fail.context = null;}}final int id = mHostView.getId();final String idText = id == View.NO_ID ? "" : " with id '"+ mHostView.getContext().getResources().getResourceEntryName(id) + "'";throw new IllegalStateException("Could not find method " + mMethodName+ "(View) in a parent or ancestor Context for android:onClick "+ "attribute defined on view " + mHostView.getClass() + idText);}}
}

ParallaxTag:

public class ParallaxTag {public float translationXIn;public float translationXOut;public float translationYIn;public float translationYOut;@Overridepublic String toString() {return "translationXIn->"+translationXIn+" translationXOut->"+translationXOut+" translationYIn->"+translationYIn+" translationYOut->"+translationYOut;}
}

自定义属性

<?xml version="1.0" encoding="utf-8"?>
<resources><!-- X方向上的位移 --><attr name="translationXIn" format="float" /><attr name="translationXOut" format="float" /><!-- Y方向上的位移 --><attr name="translationYIn" format="float" /><attr name="translationYOut" format="float" />
</resources>

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