first commit

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/workspace.xml
+/.idea/libraries
+.DS_Store
+/build
+/captures
+.externalNativeBuild

app/.gitignore

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+/build

app/build.gradle

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+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'
+}

app/proguard-rules.pro

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+# 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 *;
+#}

app/src/androidTest/java/com/xu/kevin/toolbaralphabehavior/ExampleInstrumentedTest.java

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+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 <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@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());
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.xu.kevin.toolbaralphabehavior">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/xu/kevin/toolbaralphabehavior/CustomNestedScrollView.java

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+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);
+    }
+}

app/src/main/java/com/xu/kevin/toolbaralphabehavior/MainActivity.java

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+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);
+    }
+}