问题
i found i great library to draw graphs. I want to create one that displays in the x axis the time and in y the battery percentage. My goal is create a graph like this:
You can see the percentage on the left and the date/time on bottom. Starting from this example code : https://github.com/jjoe64/GraphView-Demos/blob/master/src/com/jjoe64/graphviewdemos/CustomLabelFormatterActivity.java i want insert the correct data but i never used graphs. This is the activity
public class CustomLabelFormatterActivity extends Activity {
/** Called when the activity is first created. */
@SuppressLint("SimpleDateFormat")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.graphs);
// init example series data
Random rand = new Random();
int size = 20;
GraphViewData[] data = new GraphViewData[size];
for (int i=0; i<size; i++) {
data[i] = new GraphViewData(i, rand.nextInt(20));
}
GraphViewSeries exampleSeries = new GraphViewSeries(data);
GraphView graphView;
if (getIntent().getStringExtra("type").equals("bar")) {
graphView = new BarGraphView(
this // context
, "GraphViewDemo" // heading
);
} else {
graphView = new LineGraphView(
this // context
, "GraphViewDemo" // heading
);
}
graphView.addSeries(exampleSeries); // data
graphView.setCustomLabelFormatter(new CustomLabelFormatter() {
@Override
public String formatLabel(double value, boolean isValueX) {
if (isValueX) {
if (value < 5) {
return "small";
} else if (value < 15) {
return "middle";
} else {
return "big";
}
}
return null; // let graphview generate Y-axis label for us
}
});
LinearLayout layout = (LinearLayout) findViewById(R.id.graph1);
layout.addView(graphView);
/*
* use Date as x axis label
*/
long now = new Date().getTime();
data = new GraphViewData[size];
for (int i=0; i<size; i++) {
data[i] = new GraphViewData(now+(i*60*60*24*1000), rand.nextInt(20)); // next day
}
exampleSeries = new GraphViewSeries(data);
if (getIntent().getStringExtra("type").equals("bar")) {
graphView = new BarGraphView(
this
, "GraphViewDemo"
);
} else {
graphView = new LineGraphView(
this
, "GraphViewDemo"
);
((LineGraphView) graphView).setDrawBackground(true);
}
graphView.addSeries(exampleSeries); // data
/*
* date as label formatter
*/
final SimpleDateFormat dateFormat = new SimpleDateFormat("MMM d h.mm");
graphView.setCustomLabelFormatter(new CustomLabelFormatter() {
@Override
public String formatLabel(double value, boolean isValueX) {
if (isValueX) {
Date d = new Date((long) value);
return dateFormat.format(d);
}
return null; // let graphview generate Y-axis label for us
}
});
layout = (LinearLayout) findViewById(R.id.graph2);
layout.addView(graphView);
}
}
What have i to change?How can i create what i want?Anyone can help me? Thank you.
来源:https://stackoverflow.com/questions/18481886/battery-graph-in-android-using-graphview-library