在 MPAndroidChart 中的 activity 之间传递数据集

Question

我想在单击按钮后全屏显示条形图，但在活动之间传递 BarEntry class 时出现错误。

android.os.ParcelFormatException: Cannot parcel an Entry with non-parcelable data

我的代码：

ArrayList<BarEntry> barEntries = new ArrayList<>();
        barEntries.clear();
        barEntries.add(new BarEntry(0, new float[]{8f, 9f, 10f}, "Jan"));
        barEntries.add(new BarEntry(1, new float[]{11f, 9f, 5f}, "Feb"));
        barEntries.add(new BarEntry(2, new float[]{8f, 3f, 4f}, "Mar"));
        barEntries.add(new BarEntry(3, new float[]{5f, 14f, 2f}, "Apr"));
        barEntries.add(new BarEntry(4, new float[]{5f, 2f, 3f}, "May"));
        barEntries.add(new BarEntry(5, new float[]{2f, 15f, 6f}, "Jun"));
        barEntries.add(new BarEntry(6, new float[]{15f, 2f, 8f}, "Jul"));
        barEntries.add(new BarEntry(7, new float[]{4f, 19f, 4f}, "Aug"));
        barEntries.add(new BarEntry(8, new float[]{5f, 5f, 5f}, "Sept"));
        barEntries.add(new BarEntry(9, new float[]{6f, 6f, 6f}, "Oct"));
        barEntries.add(new BarEntry(10, new float[]{8f, 9f, 10f}, "Nov"));
        barEntries.add(new BarEntry(11, new float[]{2f, 7f, 7f}, "Dec"));
        barEntries.add(new BarEntry(12, new float[]{6f, 2f, 8f}, "Jan"));

Intent bar = new Intent(ChartRevenueActivity.this, FullscreenActivity.class);
                Bundle bundle = new Bundle();
                bundle.putSerializable("barEntries", barEntries);
                bar.putExtra("type", "barChart");
                bar.putExtras(bundle);
                startActivity(bar);

Answer 1

将此库添加到 build.gradle、

compile 'com.google.code.gson:gson:2.8.1'

使用 Gson 将您的 Arraylist 转换为 json，并将 json 字符串传递给新的 activity。

Intent bar = new Intent(ChartRevenueActivity.this, FullscreenActivity.class);
    bar.putExtra("type", "barChart");
    bar.putExtra("barentry",new Gson().toJson(barEntries));
    startActivity(bar);

像这样在新的 activity 中检索 Arraylist，

 ArrayList<BarEntry> barEntries = 
            new Gson().fromJson(getIntent().getStringExtra("barentry"), new TypeToken<ArrayList<BarEntry>>(){}.getType());

在 MPAndroidChart 中的 activity 之间传递数据集

Passing dataset between activity in MPAndroidChart

android

parcelable

mpandroidchart