如何在GraphView中實現我的sqlite數據？

Question

我有我的方法來使用rawQuery從sqlite數據檢索數據。但現在我不知道如何把它的圖形視圖，（爲前：所有日期和所有的權重列）放在graphview

這裏是代碼檢索數據

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(); 

和這是我的graphview，我如何使用我有的檢索數據方法，並添加或組合數據以在我的graphview中實現？

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

您只需爲列列表創建一個您需要的數據模型，然後將數據存儲到該數據模型中。所以你可以很容易地找到差距。

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; 
} 

這是一個用於example.and的數據模型，並且可以將數據存儲到類似的數據中。您在主文件夾（文件）Arraylist<datamodel>中創建一個數組列表文件。現在

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(); 

您的數據儲存到數據模型，那麼你只檢索it.and數據顯示到圖形很容易，你不需要做一個ArrayList。