Question

我有自己的方法使用rawQuery从sqlite数据中检索数据。但现在我不知道如何将它放在图表视图中（例如：所有日期和所有权重列）放在graphview中

以下是检索数据的代码

DBHelperNote connect = new DBHelperNote(AnalysisGraph.this);
SQLiteDatabase db = connect.getReadableDatabase();

Cursor cursor = db.rawQuery("SELECT * FROM weight;", null);

if (cursor.moveToNext()) {
    d = cursor.getString(cursor.getColumnIndex("date"));
    e = cursor.getString(cursor.getColumnIndex("weight"));

    tv.setText(d);
    tc.setText(d);
}

db.close();

这是我的graphview，我如何使用我拥有的检索数据方法并添加或组合数据以在我的graphview中实现？

 GraphView line_graph = (GraphView) contentView.findViewById(R.id.graph);
 LineGraphSeries<DataPoint> line_series =
                new LineGraphSeries<DataPoint>(new DataPoint[] {
                        new DataPoint(0, 1),
                        new DataPoint(1, 5),
                        new DataPoint(2, 3),
                        new DataPoint(3, 2),
                        new DataPoint(4, 6)
                });
 line_graph.addSeries(line_series);

 line_series.setDrawDataPoints(true);
 line_series.setDataPointsRadius(10);
 line_series.setOnDataPointTapListener(new OnDataPointTapListener() {
     @Override
            public void onTap(Series series, DataPointInterface dataPoint) {
                Toast.makeText(getActivity(), "Series: On Data Point clicked: " + dataPoint, Toast.LENGTH_SHORT).show();
            }

Answer 1

您只需为列列表创建一个数据模型，然后将数据存储到该数据模型中。所以你很容易找到一个差距。

package yourpakage name;

public class datamodel {
private String id, weight, time, date;

public datamodel(String id, String weight, String time, String date) {
    this.id = id;
    this.weight = weight;
    this.time = time;
    this.date = date;

}

public String getId() {
    return this.id;
}

public String getweight() {
    return this.weight;
}


public String getTime() {
    return this.time;
}

public String getDate() {
    return this.date;
}

public void setid(String id) {
    this.id = id;
}

public void setweight(String weight) {
    this.weight = weight;
}


public void setTime(String time) {
    this.time = time;
}

public void setDate(String date) {
    this.date = date;
}

这是您的示例的数据模型，而不是将数据存储到那样的数据模型中。您可以在主Arraylist<datamodel>中为您的文件名（文件）创建一个数组列表文件。

    DBHelperNote connect = new DBHelperNote(AnalysisGraph.this);
    file = new Arraylist<>;
    SQLiteDatabase db = connect.getReadableDatabase();
    Cursor cursor = db.rawQuery("SELECT * FROM weight;", null);

    if (cursor.moveToNext()) {
         file.add(new datamodel(data.getString(data.getColumnIndex("id")), data.getString(data.getColumnIndex("weight")),
                   , data.getString(data.getColumnIndex("time")),
                    data.getString(data.getColumnIndex("date"))));
    }

    db.close();

现在您的数据已存储到datamodel中，然后您只需从中检索数据。并轻松显示到图形中，您无需制作arraylist。

如何在GraphView中实现我的sqlite数据？

1 个答案: