空活动中的内存泄漏

问题描述

我最近决定在我的项目中使用 leakcanary，所以我创建了一个带有空 Activity 仅用于测试，当我运行应用程序时(在没有逻辑代码或视图的项目创建之后)我从这个库中得到了内存泄漏日志:

I recently decided to use leakcanary in my projects, So I created a project with an empty Activity just for test, When I run the app (just after project creation with no logic code or views) I got memory leak log from this library:

07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * com.example.leaktest.MainActivity has leaked:
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * GC ROOT static android.app.ActivityThread.sCurrentActivityThread
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * references android.app.ActivityThread.mActivities
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * references android.util.ArrayMap.mArray
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * references array java.lang.Object[].[1]
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * references android.app.ActivityThread$ActivityClientRecord.activity
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * leaks com.example.leaktest.MainActivity instance
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * Retaining: 1.7KB.
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * Reference Key: 9180226a-8a65-4c94-9d12-4562a6d88157
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * Device: Genymotion generic genymotion_vbox86tp_5.1_150409_105318 vbox86tp
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * Android Version: 5.1 API: 22 LeakCanary: 1.4-beta2 3799172
07-20 04:32:36.742 2967-4915/com.example.leaktest D/LeakCanary: * Durations: watch=5808ms, gc=158ms, heap dump=1953ms, analysis=15795ms

应用类:

public class App extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        refWatcher = LeakCanary.install(this);
    }

    public static RefWatcher getRefWatcher(Context context) {
        App application = (App) context.getApplicationContext();
        return application.refWatcher;
    }

    private RefWatcher refWatcher;
}

MainActivity 类:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        App.getRefWatcher(this).watch(this);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

我不知道为什么会这样，如果有人向我解释，我将不胜感激.

I have no idea why this is happening, I will appreciate if someone explain it to me.

推荐答案

你的 RefWatcher 应该在 onDestroy() 方法中，而不是 onCreate()(请参阅此处报告的问题).

Your RefWatcher should be in the onDestroy() method, not onCreate() (see a similar reported issue here).

您甚至不需要这样做，因为 LeakCanary 会自动监视 Activity 引用.来自 FAQ:

You don't even need to do this, since LeakCanary watches Activity references automatically. From the FAQ:

LeakCanary.install() 返回一个预配置的 RefWatcher.它还安装了一个 ActivityRefWatcher，它会在 Activity.onDestroy() 被调用后自动检测活动是否泄漏.

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