利用 LeakCanary 来检查 Android 内存泄漏

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