活动销毁时，AnyChartView发生内存泄漏

问题描述

我正在使用LeakCanary来检测内存泄漏，但我是新手。当我的活动遭到破坏时，它给了我泄漏的报告。我对anychart库也不熟悉。我该如何解决这个问题？下面是我的活动代码和leacanary的stacktrace。另外，如果可以的话，请您向我详细说明如何读取泄漏cancanary的堆栈跟踪。

public class AnalyticsActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_analytics);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            getwindow().setStatusBarColor(Color.WHITE);
        }

        AnyChartView anyChartView = findViewById(R.id.any_chart_view);
        anyChartView.setProgressBar(findViewById(R.id.progress_bar));

        Cartesian cartesian = AnyChart.column();

        List<DataEntry> data = new ArrayList<>();
        data.add(new ValueDataEntry("Rouge",80540));
        data.add(new ValueDataEntry("Foundation",94190));
        data.add(new ValueDataEntry("Mascara",102610));
        data.add(new ValueDataEntry("Lip gloss",110430));
        data.add(new ValueDataEntry("Lipstick",128000));
        data.add(new ValueDataEntry("Nail polish",143760));
        data.add(new ValueDataEntry("Eyebrow pencil",170670));
        data.add(new ValueDataEntry("Eyeliner",213210));
        data.add(new ValueDataEntry("Eyeshadows",249980));

        Column column = cartesian.column(data);

        column.tooltip()
                .titleFormat("{%X}")
                .position(Position.CENTER_BottOM)
                .anchor(Anchor.CENTER_BottOM)
                .offsetX(0d)
                .offsetY(5d)
                .format("${%Value}{groupsSeparator: }");

        cartesian.animation(true);
        cartesian.title("Top 10 Cosmetic Products by Revenue");

        cartesian.yScale().minimum(0d);

        cartesian.yAxis(0).labels().format("${%Value}{groupsSeparator: }");

        cartesian.tooltip().positionMode(TooltipPositionMode.POINT);
        cartesian.interactivity().hoverMode(HoverMode.BY_X);

        cartesian.xAxis(0).title("Product");
        cartesian.yAxis(0).title("Revenue");

        anyChartView.setChart(cartesian);
    }
}

┬───
    │ GC Root: System class
    │
    ├─ com.anychart.APIlib class
    │    Leaking: NO (a class is never leaking)
    │    ↓ static APIlib.instance
    │                    ~~~~~~~~
    ├─ com.anychart.APIlib instance
    │    Leaking: UNKNowN
    │    ↓ APIlib.anyChartView
    │             ~~~~~~~~~~~~
    ├─ com.anychart.AnyChartView instance
    │    Leaking: YES (View.mContext references a destroyed activity)
    │    mContext instance of com.dreamakers.clustore.clustorestore.Activity.AnalyticsActivity with mDestroyed = true
    │    View#mParent is set
    │    View#mAttachInfo is null (view detached)
    │    View.mID = R.id.any_chart_view
    │    View.mWindowAttachCount = 1
    │    ↓ AnyChartView.mContext
    ╰→ com.dreamakers.clustore.clustorestore.Activity.AnalyticsActivity instance
    ​     Leaking: YES (ObjectWatcher was watching this because com.dreamakers.clustore.clustorestore.Activity.AnalyticsActivity received Activity#onDestroy() callback and Activity#mDestroyed is true)
    ​     key = 7ac56641-d049-41a3-8cb8-0a2cae7cc320
    ​     watchDurationMillis = 8099
    ​     retainedDurationMillis = 3098

解决方法

AnyChart-Android库存在内存泄漏。我在这里提出了一个问题：https://github.com/AnyChart/AnyChart-Android/issues/190

在此问题解决之前，您可以通过以下方式解决它：

public void onDestroy() {
    super.onDestroy();
    APIlib.setActiveAnyChartView(null);
}

,

我认为最简单的方法是将AnyChartView分配给全局变量，然后在活动的onDestroy()方法中为其分配null：

public void onDestroy() {
    anyChartView = null;
    super.onDestroy()
}

这里的情况是AnyChartView持有对Activity的上下文的引用，这就是为什么由于库存储此引用的方式而无法轻易地垃圾回收Activity的原因。