android-graphview - GraphView 和 resetData

Question

请帮助我，我使用 GraphView 库（http://www.jjoe64.com/p/graphview-library.html），它可以工作。但我不明白如何重置以前的数据。

方法redrawAll()不起作用。

这是我的代码：

   public class MainActivity extends Activity implements OnClickListener{
   private final static int DIALOG_ID=0;

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

    Button btnDialog=(Button)findViewById(R.id.btnDialog);
    btnDialog.setOnClickListener(this);

}


    @Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}

@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
    switch(v.getId()){
      case R.id.btnDialog:
          createGraph();
    break;

    }

}   

//graph create method       
void createGraph(){

    // draw sin curve
    int num = 100;
    GraphViewData[] data = new GraphViewData[num];
    GraphView graphView;

    double  v=0;
    for (int i=0; i<num; i++) {
        v += 0.50;
        data[i] = new GraphViewData(i, Math.random()*v);
       }

    // graph with dynamically genereated horizontal and vertical labels
   graphView = new LineGraphView(
            getBaseContext()
            , "myGraph"
    );




   graphView.redrawAll();

  ((LineGraphView) graphView).setDrawBackground(true);

    // add data
    graphView.addSeries(new GraphViewSeries(data));
    // set view port, start=2, size=10
    graphView.setViewPort(2, 40);
    graphView.setScalable(true);

    LinearLayout layout = (LinearLayout)findViewById(R.id.lvGraphView);
    layout.addView(graphView);  

}


 }

Answer 1

I guess by reset you mean to clear all the graph and then draw something new again? Then you could use graphView.removeAllSeries();.

Answer 2

一种方法是删除 graphview 视图并完全重新创建它。

另一种方法是使用实​​时功能。您应该直接从 github 使用最新版本的 graphview。resetData您可以使用或更改系列中的数据appendData。看看 github 上的 GraphView-Demo 项目。

exampleSeries1.resetData(new GraphViewData[] {
        new GraphViewData(1, getRandom())
        , new GraphViewData(2, getRandom())
        , new GraphViewData(2.5, getRandom()) // another frequency
        , new GraphViewData(3, getRandom())
        , new GraphViewData(4, getRandom())
        , new GraphViewData(5, getRandom())
});