diff --git a/.gitignore b/.gitignore
new file mode 100644
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,9 @@
+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.externalNativeBuild
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
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+++ b/.idea/compiler.xml
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+
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diff --git a/.idea/copyright/profiles_settings.xml b/.idea/copyright/profiles_settings.xml
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--- /dev/null
+++ b/.idea/copyright/profiles_settings.xml
@@ -0,0 +1,3 @@
+
+
+
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
new file mode 100644
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--- /dev/null
+++ b/.idea/gradle.xml
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+
+
+
+
+
+
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
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--- /dev/null
+++ b/.idea/misc.xml
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+
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+
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diff --git a/.idea/modules.xml b/.idea/modules.xml
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+++ b/.idea/modules.xml
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+
+
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+
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
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--- /dev/null
+++ b/.idea/runConfigurations.xml
@@ -0,0 +1,12 @@
+
+
+
+
+
+
\ No newline at end of file
diff --git a/app/.gitignore b/app/.gitignore
new file mode 100644
index 0000000..796b96d
--- /dev/null
+++ b/app/.gitignore
@@ -0,0 +1 @@
+/build
diff --git a/app/build.gradle b/app/build.gradle
new file mode 100644
index 0000000..1df57c2
--- /dev/null
+++ b/app/build.gradle
@@ -0,0 +1,29 @@
+apply plugin: 'com.android.application'
+
+android {
+ compileSdkVersion 25
+ buildToolsVersion "25.0.2"
+ defaultConfig {
+ applicationId "com.xu.kevin.toolbaralphabehavior"
+ minSdkVersion 16
+ targetSdkVersion 25
+ versionCode 1
+ versionName "1.0"
+ testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+ }
+ buildTypes {
+ release {
+ minifyEnabled false
+ proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+ }
+ }
+}
+
+dependencies {
+ compile fileTree(dir: 'libs', include: ['*.jar'])
+ androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
+ exclude group: 'com.android.support', module: 'support-annotations'
+ })
+ compile 'com.android.support:appcompat-v7:25.1.1'
+ testCompile 'junit:junit:4.12'
+}
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
new file mode 100644
index 0000000..44d7a06
--- /dev/null
+++ b/app/proguard-rules.pro
@@ -0,0 +1,17 @@
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in C:\Users\kevin\AppData\Local\Android\sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+# http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+# public *;
+#}
diff --git a/app/src/androidTest/java/com/xu/kevin/toolbaralphabehavior/ExampleInstrumentedTest.java b/app/src/androidTest/java/com/xu/kevin/toolbaralphabehavior/ExampleInstrumentedTest.java
new file mode 100644
index 0000000..31f4b7d
--- /dev/null
+++ b/app/src/androidTest/java/com/xu/kevin/toolbaralphabehavior/ExampleInstrumentedTest.java
@@ -0,0 +1,26 @@
+package com.xu.kevin.toolbaralphabehavior;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see Testing documentation
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+ @Test
+ public void useAppContext() throws Exception {
+ // Context of the app under test.
+ Context appContext = InstrumentationRegistry.getTargetContext();
+
+ assertEquals("com.xu.kevin.toolbaralphabehavior", appContext.getPackageName());
+ }
+}
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..b917fcb
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,20 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+
\ No newline at end of file
diff --git a/app/src/main/java/com/xu/kevin/toolbaralphabehavior/CustomNestedScrollView.java b/app/src/main/java/com/xu/kevin/toolbaralphabehavior/CustomNestedScrollView.java
new file mode 100644
index 0000000..df18d18
--- /dev/null
+++ b/app/src/main/java/com/xu/kevin/toolbaralphabehavior/CustomNestedScrollView.java
@@ -0,0 +1,47 @@
+package com.xu.kevin.toolbaralphabehavior;
+
+import android.content.Context;
+import android.support.v4.widget.NestedScrollView;
+import android.util.AttributeSet;
+
+
+/**
+ * 如果
+ */
+public class CustomNestedScrollView extends NestedScrollView {
+ public ScrollInterface scrollInterface;
+
+ public CustomNestedScrollView(Context context) {
+ this(context, null);
+ }
+
+ public CustomNestedScrollView(Context context, AttributeSet attrs) {
+ this(context, attrs, 0);
+ }
+
+ public CustomNestedScrollView(Context context, AttributeSet attrs, int defStyleAttr) {
+ super(context, attrs, defStyleAttr);
+ }
+
+
+ @Override
+ protected void onScrollChanged(int l, int t, int oldl, int oldt) {
+ super.onScrollChanged(l, t, oldl, oldt);
+ if(scrollInterface!=null){
+ scrollInterface.onSChanged(l, t, oldl, oldt);
+ }
+ }
+
+
+ public void setOnCustomScroolChangeListener(ScrollInterface t) {
+ this.scrollInterface = t;
+ }
+
+ /**
+ * 定义滑动接口
+ * @param
+ */
+ public interface ScrollInterface {
+ public void onSChanged(int l, int t, int oldl, int oldt);
+ }
+}
diff --git a/app/src/main/java/com/xu/kevin/toolbaralphabehavior/MainActivity.java b/app/src/main/java/com/xu/kevin/toolbaralphabehavior/MainActivity.java
new file mode 100644
index 0000000..2513140
--- /dev/null
+++ b/app/src/main/java/com/xu/kevin/toolbaralphabehavior/MainActivity.java
@@ -0,0 +1,64 @@
+package com.xu.kevin.toolbaralphabehavior;
+
+import android.app.Activity;
+import android.content.Context;
+import android.os.Build;
+import android.os.Bundle;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.Window;
+
+public class MainActivity extends AppCompatActivity {
+ private ToolBarAlphaBehavior toolBarAlphaBehavior;
+ private Toolbar toolbar;
+ private CustomNestedScrollView mScrollView;
+ @Override
+ protected void onCreate(Bundle savedInstanceState) {
+ super.onCreate(savedInstanceState);
+ setContentView(R.layout.activity_main);
+ mScrollView=(CustomNestedScrollView)findViewById(R.id.scrollView);
+ initToolBar();
+ }
+
+ private void initToolBar(){
+ toolbar=(Toolbar)findViewById(R.id.toolbar);
+ toolbar.setNavigationIcon(R.drawable.draw_back);
+ setSupportActionBar(toolbar);
+ toolbar.setTitle("");
+ getSupportActionBar().setDisplayShowTitleEnabled(false);
+
+ int imageViewHeight=dip2px(360);
+ //toolBar变色回调
+ toolBarAlphaBehavior = new ToolBarAlphaBehavior(getBaseContext(),toolbar, "000000", new ToolBarAlphaBehavior.CallBack() {
+ @Override
+ public void callBack(int color) {
+ setStatuBarColor(color);
+ }
+ },imageViewHeight);
+
+ //初始化toolBar 颜色
+ toolBarAlphaBehavior.setAlPha(ToolBarAlphaBehavior.minAlpha);//toolbar透明度初始化
+
+ //监听 NestScrollView
+ mScrollView.setOnCustomScroolChangeListener(new CustomNestedScrollView.ScrollInterface() {
+ @Override
+ public void onSChanged(int l, int t, int oldl, int oldt) {
+ //渐变色.
+ if (toolBarAlphaBehavior != null)
+ toolBarAlphaBehavior.onNestedScroll(t);
+ }
+ });
+ }
+
+ public void setStatuBarColor( int color) {
+ if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+ Window window = this.getWindow();
+ window.setStatusBarColor(color);
+ }
+ }
+
+ public int dip2px( float dpValue) {
+ final float scale =this.getResources().getDisplayMetrics().density;
+ return (int) (dpValue * scale + 0.5f);
+ }
+}
diff --git a/app/src/main/java/com/xu/kevin/toolbaralphabehavior/ToolBarAlphaBehavior.java b/app/src/main/java/com/xu/kevin/toolbaralphabehavior/ToolBarAlphaBehavior.java
new file mode 100644
index 0000000..ed75535
--- /dev/null
+++ b/app/src/main/java/com/xu/kevin/toolbaralphabehavior/ToolBarAlphaBehavior.java
@@ -0,0 +1,110 @@
+package com.xu.kevin.toolbaralphabehavior;
+
+import android.content.Context;
+import android.graphics.Color;
+import android.graphics.drawable.GradientDrawable;
+import android.support.v7.widget.Toolbar;
+
+
+
+/**
+ * toolBar透明值渐变处理类
+ */
+public class ToolBarAlphaBehavior {
+ private static final String TAG = "ToolbarAlphaBehavior";
+ private int offset = 0;
+ private int startOffset = 0;
+ private int endOffset = 0;
+
+ public static int minAlpha = 50;//最小透明度
+ private int maxAlpha = 255;//最大透明度
+ private int maxY = 1000;//透明度变化结束的位置
+
+ private Toolbar toolbar;
+ private Context context;
+ private String defaultColor;
+ private CallBack callBack;
+
+ /**
+ *
+ * @param context
+ * @param toolbar
+ * @param defaultColor 完全不透明时的色值
+ * @param callBack
+ * @param maxY //结束变色,完全不透明时的位置
+ */
+ public ToolBarAlphaBehavior(Context context, Toolbar toolbar, String defaultColor, CallBack callBack, int maxY) {
+ this.context = context;
+ this.toolbar=toolbar;
+ this.defaultColor=defaultColor;
+ this.callBack=callBack;
+ // 渐变色最大差距值变化滑动距离
+ startOffset= toolbar.getHeight();//开始变色的位置
+ endOffset = maxY- toolbar.getHeight();//结束变色的位置
+ this.maxY=maxY;
+ }
+
+
+ /**
+ *
+ * @param num scrollView滚动的距离
+ */
+ //.getBackground().setAlpha方法會改變app所有toolbar的顏色，bug
+ public void setAlPha(int num){
+ if(num>maxAlpha){
+ num=maxAlpha;
+ }
+ if(num=maxAlpha-minAlpha){
+ bottomAlphaNum=num-minAlpha+(num-(maxAlpha-minAlpha));
+ }else{
+ bottomAlphaNum=num-minAlpha;
+ }
+ String bottomAlpha;
+ if(bottomAlphaNum!=0) {
+ bottomAlpha= Integer.toHexString(bottomAlphaNum);
+ if (bottomAlpha.length() == 1) {
+ bottomAlpha = "0" + bottomAlpha;
+ }
+ }else{
+ bottomAlpha= "00";
+ }
+
+
+ int colors[] = { Color.parseColor("#" + topAl + defaultColor) , Color.parseColor("#" + bottomAlpha + defaultColor) };
+ GradientDrawable g = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, colors);
+ toolbar.setBackgroundDrawable(g);
+ callBack.callBack(Color.parseColor("#"+topAl + defaultColor));
+ }
+
+
+ public void onNestedScroll(int y) {
+ offset =y;
+ if (offset <= startOffset) { //alpha为0
+ setAlPha(minAlpha);
+ //toolbar.getBackground().setAlpha(minAlpha);
+ } else if (offset > startOffset && offset < endOffset) { //alpha为0到235
+ float precent = (float) (offset - startOffset) / (float)(endOffset-startOffset);
+ int alpha = Math.round(precent * (maxAlpha-minAlpha));
+ setAlPha(alpha + minAlpha);
+ //toolbar.getBackground().setAlpha(alpha+minAlpha);
+ } else if (offset >= endOffset) { //alpha为235
+ setAlPha(maxAlpha);
+ //toolbar.getBackground().setAlpha(maxAlpha);
+ }
+ }
+
+ public interface CallBack{
+ void callBack(int color);
+ }
+}
diff --git a/app/src/main/res/drawable/draw_back.xml b/app/src/main/res/drawable/draw_back.xml
new file mode 100644
index 0000000..38eaee6
--- /dev/null
+++ b/app/src/main/res/drawable/draw_back.xml
@@ -0,0 +1,5 @@
+
+
+