完成作业及Demo，实现内存中重复Bitmap的检测

build.gradle

@@ -7,7 +7,7 @@ buildscript {
 
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.2.0'
+        classpath 'com.android.tools.build:gradle:7.0.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.6-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-all.zip

hprof/.gitignore

@@ -0,0 +1 @@
+/build

hprof/build.gradle

@@ -0,0 +1,39 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 32
+
+    defaultConfig {
+        applicationId "com.example.hprof"
+        minSdk 21
+        targetSdk 32
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.squareup.haha:haha:2.0.4'
+    implementation group: 'com.squareup.leakcanary', name: 'leakcanary-watcher', version: '1.6.2'
+    implementation 'com.android.support.constraint:constraint-layout:2.0.4'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}

hprof/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# 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 *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

hprof/src/androidTest/java/com/example/hprof/ExampleInstrumentedTest.java

@@ -0,0 +1,25 @@
+package com.example.hprof;
+
+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.*;
+
+/**
+ * Instrumented 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() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.example.hprof", appContext.getPackageName());
+    }
+}

hprof/src/main/AndroidManifest.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.hprof">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Chapter04">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

hprof/src/main/java/com/example/hprof/MainActivity.java

@@ -0,0 +1,53 @@
+package com.example.hprof;
+
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.os.Debug;
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.ImageView;
+
+import com.example.hprof.util.HprofAnalysis;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ThreadPoolExecutor;
+
+public class MainActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        Bitmap bitmap1 = BitmapFactory.decodeResource(getResources(), R.drawable.down_faile);
+        Bitmap bitmap2 = BitmapFactory.decodeResource(getResources(), R.drawable.down_focus);
+        Bitmap bitmap3 = BitmapFactory.decodeResource(getResources(), R.drawable.down_faile);
+        Bitmap bitmap4 = BitmapFactory.decodeResource(getResources(), R.drawable.down_focus);
+
+        ((ImageView) findViewById(R.id.image1)).setImageBitmap(bitmap1);
+        ((ImageView) findViewById(R.id.image3)).setImageBitmap(bitmap2);
+        ((ImageView) findViewById(R.id.image2)).setImageBitmap(bitmap3);
+        ((ImageView) findViewById(R.id.image4)).setImageBitmap(bitmap4);
+
+        findViewById(R.id.dump).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                File file = new File(getExternalCacheDir(), "dump.hprof");
+                Executors.newSingleThreadExecutor().execute(new Runnable() {
+                    @Override
+                    public void run() {
+                        try {
+                            Debug.dumpHprofData(file.getAbsolutePath());
+                            HprofAnalysis.analysis(file.getAbsolutePath());
+                        } catch (IOException e) {
+                            e.printStackTrace();
+                        }
+                    }
+                });
+            }
+        });
+    }
+}

hprof/src/main/java/com/example/hprof/util/HahaHelper.java

@@ -0,0 +1,180 @@
+package com.example.hprof.util;
+
+import static com.example.hprof.util.Preconditions.checkNotNull;
+
+import com.squareup.haha.perflib.ArrayInstance;
+import com.squareup.haha.perflib.ClassInstance;
+import com.squareup.haha.perflib.ClassObj;
+import com.squareup.haha.perflib.Instance;
+import com.squareup.haha.perflib.Type;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.nio.charset.Charset;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import static java.util.Arrays.asList;
+
+public final class HahaHelper {
+
+    private static final Set<String> WRAPPER_TYPES = new HashSet<>(
+            asList(Boolean.class.getName(), Character.class.getName(), Float.class.getName(),
+                    Double.class.getName(), Byte.class.getName(), Short.class.getName(),
+                    Integer.class.getName(), Long.class.getName()));
+
+    static String threadName(Instance holder) {
+        List<ClassInstance.FieldValue> values = classInstanceValues(holder);
+        Object nameField = fieldValue(values, "name");
+        if (nameField == null) {
+            // Sometimes we can't find the String at the expected memory address in the heap dump.
+            // See https://github.com/square/leakcanary/issues/417 .
+            return "Thread name not available";
+        }
+        return asString(nameField);
+    }
+
+    static boolean extendsThread(ClassObj clazz) {
+        boolean extendsThread = false;
+        ClassObj parentClass = clazz;
+        while (parentClass.getSuperClassObj() != null) {
+            if (parentClass.getClassName().equals(Thread.class.getName())) {
+                extendsThread = true;
+                break;
+            }
+            parentClass = parentClass.getSuperClassObj();
+        }
+        return extendsThread;
+    }
+
+    /**
+     * This returns a string representation of any object or value passed in.
+     */
+    static String valueAsString(Object value) {
+        String stringValue;
+        if (value == null) {
+            stringValue = "null";
+        } else if (value instanceof ClassInstance) {
+            String valueClassName = ((ClassInstance) value).getClassObj().getClassName();
+            if (valueClassName.equals(String.class.getName())) {
+                stringValue = '"' + asString(value) + '"';
+            } else {
+                stringValue = value.toString();
+            }
+        } else {
+            stringValue = value.toString();
+        }
+        return stringValue;
+    }
+
+    /** Given a string instance from the heap dump, this returns its actual string value. */
+    static String asString(Object stringObject) {
+        checkNotNull(stringObject, "stringObject");
+        Instance instance = (Instance) stringObject;
+        List<ClassInstance.FieldValue> values = classInstanceValues(instance);
+
+        Integer count = fieldValue(values, "count");
+        checkNotNull(count, "count");
+        if (count == 0) {
+            return "";
+        }
+
+        Object value = fieldValue(values, "value");
+        checkNotNull(value, "value");
+
+        Integer offset;
+        ArrayInstance array;
+        if (isCharArray(value)) {
+            array = (ArrayInstance) value;
+
+            offset = 0;
+            // < API 23
+            // As of Marshmallow, substrings no longer share their parent strings' char arrays
+            // eliminating the need for String.offset
+            // https://android-review.googlesource.com/#/c/83611/
+            if (hasField(values, "offset")) {
+                offset = fieldValue(values, "offset");
+                checkNotNull(offset, "offset");
+            }
+
+            char[] chars = array.asCharArray(offset, count);
+            return new String(chars);
+        } else if (isByteArray(value)) {
+            // In API 26, Strings are now internally represented as byte arrays.
+            array = (ArrayInstance) value;
+
+            // HACK - remove when HAHA's perflib is updated to https://goo.gl/Oe7ZwO.
+            try {
+                Method asRawByteArray =
+                        ArrayInstance.class.getDeclaredMethod("asRawByteArray", int.class, int.class);
+                asRawByteArray.setAccessible(true);
+                byte[] rawByteArray = (byte[]) asRawByteArray.invoke(array, 0, count);
+                return new String(rawByteArray, Charset.forName("UTF-8"));
+            } catch (NoSuchMethodException e) {
+                throw new RuntimeException(e);
+            } catch (IllegalAccessException e) {
+                throw new RuntimeException(e);
+            } catch (InvocationTargetException e) {
+                throw new RuntimeException(e);
+            }
+        } else {
+            throw new UnsupportedOperationException("Could not find char array in " + instance);
+        }
+    }
+
+    public static boolean isPrimitiveWrapper(Object value) {
+        if (!(value instanceof ClassInstance)) {
+            return false;
+        }
+        return WRAPPER_TYPES.contains(((ClassInstance) value).getClassObj().getClassName());
+    }
+
+    public static boolean isPrimitiveOrWrapperArray(Object value) {
+        if (!(value instanceof ArrayInstance)) {
+            return false;
+        }
+        ArrayInstance arrayInstance = (ArrayInstance) value;
+        if (arrayInstance.getArrayType() != Type.OBJECT) {
+            return true;
+        }
+        return WRAPPER_TYPES.contains(arrayInstance.getClassObj().getClassName());
+    }
+
+    private static boolean isCharArray(Object value) {
+        return value instanceof ArrayInstance && ((ArrayInstance) value).getArrayType() == Type.CHAR;
+    }
+
+    private static boolean isByteArray(Object value) {
+        return value instanceof ArrayInstance && ((ArrayInstance) value).getArrayType() == Type.BYTE;
+    }
+
+    static List<ClassInstance.FieldValue> classInstanceValues(Instance instance) {
+        ClassInstance classInstance = (ClassInstance) instance;
+        return classInstance.getValues();
+    }
+
+    @SuppressWarnings({ "unchecked", "TypeParameterUnusedInFormals" })
+    static <T> T fieldValue(List<ClassInstance.FieldValue> values, String fieldName) {
+        for (ClassInstance.FieldValue fieldValue : values) {
+            if (fieldValue.getField().getName().equals(fieldName)) {
+                return (T) fieldValue.getValue();
+            }
+        }
+        throw new IllegalArgumentException("Field " + fieldName + " does not exists");
+    }
+
+    static boolean hasField(List<ClassInstance.FieldValue> values, String fieldName) {
+        for (ClassInstance.FieldValue fieldValue : values) {
+            if (fieldValue.getField().getName().equals(fieldName)) {
+                //noinspection unchecked
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private HahaHelper() {
+        throw new AssertionError();
+    }
+}