利用 LeakCanary 来检查 Android 内存泄漏

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LeakCanary简介

LeakCanary是一款开源的内存泄露检测工具。开源代码被github托管。地址：https://github.com/SOFTPOWER1991/leakcanarySample_androidStudio
有些对象只有有限的生命周期。当它们的任务完成之后，它们将被垃圾回收。如果在对象的生命周期本该结束的时候，这个对象还被一系列的引用，这就会导致内存泄漏。随着泄漏的累积，app将消耗完内存。

android stdio 接入方式

1.android stdio 将工程切到android模式，在build.gradle(module模式下)添加依赖：

 dependencies {   debugCompile 'com.squareup.leakcanary:leakcanary-android:1.5'   releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5'   testCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.5' }

2.要监控Activity泄露，自定义Application

public class MyApplication extends Application {    private static final String TAG = "MyApplication";    public static RefWatcher getRefWatcher(Context context) {        MyApplication application = (MyApplication) context.getApplicationContext();        return application.refWatcher;    }    private RefWatcher refWatcher;    @Override    public void onCreate() {        Log.i(TAG,"onCreate first called............");        super.onCreate();        refWatcher = LeakCanary.install(this);    }}

3.在AndroidManifest.xml配置文件中声明MyApplication

<application        android:name=".MyApplication"        android:allowBackup="true"        android:icon="@drawable/icon"        android:label="@string/app_name"        android:supportsRtl="true"        android:theme="@style/AppTheme">

4.一个测试的例子

public class SecondActivity extends AppCompatActivity {    static Demo sDemo;    private static final String TAG = "SecondActivity";    @Override    protected void onCreate(Bundle savedInstanceState) {        Log.i(TAG,"onCreate() is called!!!!!!!!!!!!!!!!");        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_second);        if (sDemo == null) {            sDemo = new Demo();        }        finish();    }    class Demo {        private ArrayList<String> a = new ArrayList<String>();        public Demo() {}    }}

5.执行后结果：

内存泄露的场景举例

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