Activity 销毁时，AnyChartView 出现内存泄漏

Question

我正在使用 LeakCanary 来检测内存泄漏，我是新手。当我的活动被破坏时，它给了我一份泄漏报告。我对任何图表库也不熟悉。我该如何解决这个问题？下面是我的活动代码和leakcanary的堆栈跟踪。另外，如果可能的话，请您详细说明如何阅读leakcanary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

Answer 1

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

在修复之前，您可以通过这种方式解决它：

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

Answer 2

我认为您可以做的最简单的事情是将 AnyChartView 分配给全局变量，然后在活动的onDestroy() 方法中将 null 分配给它：

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

这里的情况是 AnyChartView 持有对 Activity 上下文的引用，这就是为什么 Activity 不容易被垃圾回收，因为库存储此引用的方式。