第一次提交，完成异步加载、并发加载时图片错位、内存缓存

.gitignore

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+/# Built application files
+*.apk
+*.ap_
+
+# Files for the Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/captures
+
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio
+
+*.iml
+
+## Directory-based project format:
+.idea/
+# if you remove the above rule, at least ignore the following:
+
+# User-specific stuff:
+# .idea/workspace.xml
+# .idea/tasks.xml
+# .idea/dictionaries
+
+# Sensitive or high-churn files:
+# .idea/dataSources.ids
+# .idea/dataSources.xml
+# .idea/sqlDataSources.xml
+# .idea/dynamic.xml
+# .idea/uiDesigner.xml
+
+# Gradle:
+# .idea/gradle.xml
+# .idea/libraries
+
+# Mongo Explorer plugin:
+# .idea/mongoSettings.xml
+
+## File-based project format:
+*.ipr
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties

ImageLoadHelperByXinYi/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 23
+    buildToolsVersion "23.0.1"
+
+    defaultConfig {
+        applicationId "bitmap.trainning.google.com.displaybitmapsefficiently"
+        minSdkVersion 10
+        targetSdkVersion 23
+        versionCode 1
+        versionName "1.0"
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+}
+
+dependencies {
+    compile fileTree(include: ['*.jar'], dir: 'libs')
+    testCompile 'junit:junit:4.12'
+    compile 'com.android.support:appcompat-v7:23.1.0'
+    compile 'com.google.guava:guava:18.0'
+}

ImageLoadHelperByXinYi/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 F:\MyAndroidWorkSpace\EclipseRoot\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 *;
+#}

ImageLoadHelperByXinYi/src/androidTest/java/bitmap/trainning/google/com/displaybitmapsefficiently/ApplicationTest.java

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+package bitmap.trainning.google.com.displaybitmapsefficiently;
+
+import android.app.Application;
+import android.test.ApplicationTestCase;
+
+/**
+ * <a href="http://d.android.com/tools/testing/testing_android.html">Testing Fundamentals</a>
+ */
+public class ApplicationTest extends ApplicationTestCase<Application> {
+    public ApplicationTest() {
+        super(Application.class);
+    }
+}

ImageLoadHelperByXinYi/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="bitmap.trainning.google.com.displaybitmapsefficiently" >
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme" >
+        <activity android:name=".ui.MainActivity" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

ImageLoadHelperByXinYi/src/main/java/bitmap/trainning/google/com/displaybitmapsefficiently/ui/MainActivity.java

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+package bitmap.trainning.google.com.displaybitmapsefficiently.ui;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.widget.ImageView;
+
+import bitmap.trainning.google.com.displaybitmapsefficiently.R;
+import bitmap.trainning.google.com.displaybitmapsefficiently.util.core.ImageDownloader;
+
+public class MainActivity extends Activity {
+
+    private ImageView mImageView;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        mImageView = (ImageView) findViewById(R.id.mImageView);
+
+       /* // 界面渲染结束后设置进去, 可获取高度
+        mImageView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
+            @Override
+            public void onGlobalLayout() {
+                // 视图树, 界面渲染结束时被调用
+                String s = MoreObjects.toStringHelper(this)
+                        .add("width", mImageView.getWidth())
+                        .add("height", mImageView.getHeight())
+                        .toString();
+                Log.i("cz", s);
+                BitmapScaleUtils.loadBitmap(getBaseContext(), R.mipmap.lxs, mImageView);
+                mImageView.getViewTreeObserver().removeGlobalOnLayoutListener(this);
+            }
+        });*/
+
+        /**
+         * example url :
+         * http://e.hiphotos.baidu.com/image/pic/item/d788d43f8794a4c201bd81230cf41bd5ad6e391f.jpg
+         * http://c.hiphotos.baidu.com/image/h%3D200/sign=08523c111fd5ad6eb5f963eab1ca39a3/377adab44aed2e73519d81f98301a18b86d6faeb.jpg
+         * http://g.hiphotos.baidu.com/image/h%3D360/sign=f0187d289d510fb367197191e932c893/b999a9014c086e060b400cda01087bf40bd1cbb2.jpg
+         */
+        ImageDownloader.display(this,"http://g.hiphotos.baidu.com/image/h%3D360/sign=f0187d289d510fb367197191e932c893/b999a9014c086e060b400cda01087bf40bd1cbb2.jpg", mImageView);
+    }
+}

ImageLoadHelperByXinYi/src/main/java/bitmap/trainning/google/com/displaybitmapsefficiently/util/core/BitmapScaleUtils.java

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+package bitmap.trainning.google.com.displaybitmapsefficiently.util.core;
+
+import android.content.res.Resources;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.Matrix;
+import android.graphics.Paint;
+
+/**
+ * Created by LENOVO on 2015/11/6.
+ * come from "http://developer.android.com/intl/zh-cn/training/displaying-bitmaps/manage-memory.html","http://android-developers.blogspot.com/"
+ * bug1:the bitmap shows normally on virtual device,but wrongly on real device
+ */
+
+public class BitmapScaleUtils {
+
+
+    //calculate the scale percentage
+    public static int calculateInSampleSize(
+            BitmapFactory.Options options, int reqWidth, int reqHeight) {
+        // Raw height and width of image
+        final int height = options.outHeight;
+        final int width = options.outWidth;
+        int inSampleSize = 1;
+
+        if (height > reqHeight || width > reqWidth) {
+
+            final int halfHeight = height / 2;
+            final int halfWidth = width / 2;
+
+            // Calculate the largest inSampleSize value that is a power of 2 and keeps both
+            // height and width larger than the requested height and width.
+            while ((halfHeight / inSampleSize) > reqHeight
+                    && (halfWidth / inSampleSize) > reqWidth) {
+                inSampleSize *= 2;
+            }
+        }
+
+        return inSampleSize;    //the inSampleSize is more larger,the more small the bitmap will be.
+    }
+
+    //decode bitmap from resources
+    public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
+                                                         int reqWidth, int reqHeight) {
+
+        // First decode with inJustDecodeBounds=true to check dimensions
+        final BitmapFactory.Options options = new BitmapFactory.Options();
+        options.inJustDecodeBounds = true;
+        BitmapFactory.decodeResource(res, resId, options);
+        // Calculate inSampleSize
+        options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
+
+        // Decode bitmap with inSampleSize set
+        options.inJustDecodeBounds = false;
+        return BitmapFactory.decodeResource(res, resId, options);
+    }
+
+    //防止图片的像素过大，对图片进行一定的压缩。
+    public static Bitmap decodeSampledBitmapFromSelf(Bitmap srcBitmap, int reqWidth, int reqHeight){
+        // First decode with inJustDecodeBounds=true to check dimensions
+        final BitmapFactory.Options options = new BitmapFactory.Options();
+        options.outWidth = srcBitmap.getWidth();
+        options.outHeight = srcBitmap.getHeight();
+        int inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
+
+        //make a copy of the Bitmap
+        Bitmap.Config config = srcBitmap.getConfig();
+        Bitmap copyBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), config);
+        Matrix matrix = new Matrix();
+
+        //scale the copybitmap,if possible ,make it smaller to avoid the oom
+        matrix.setScale(1.0f/inSampleSize,1.0f/inSampleSize);
+        new Canvas(copyBitmap).drawBitmap(srcBitmap, matrix, new Paint());
+        return copyBitmap;
+    }
+}