android使用MPAndroidChart开源图表折线图

1. 将mpandroidchartlibrary-2-1-6.ja包copy到项目的libs中在引用

2:布局文件

<com.github.mikephil.charting.charts.LineChart
android:id="@+id/chart1"
android:layout_marginTop="10dp"
android:layout_width="match_parent"
android:layout_height="200dp"
/>

3:后台代码

public class OilReportformsFragment extends Fragment{

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
//return super.onCreateView(inflater, container, savedInstanceState);
return inflater.inflate(R.layout.oilreportforms, container, false);
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub

//getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);
super.onActivityCreated(savedInstanceState);

LineChart  mChart = (LineChart)getActivity().findViewById(R.id.chart1);

mChart.setDescription("");
mChart.setDrawGridBackground(false);

///aj
mChart.setTouchEnabled(true);
mChart.setDragEnabled(true);
mChart.setScaleEnabled(true);

Typeface mTf = Typeface.createFromAsset(getActivity().getApplicationContext().getAssets(), "OpenSans-Regular.ttf");

XAxis xAxis = mChart.getXAxis();
xAxis.setPosition(XAxisPosition.BOTTOM);
xAxis.setTypeface(mTf);
xAxis.setDrawGridLines(false);
xAxis.setDrawAxisLine(true);

YAxis leftAxis = mChart.getAxisLeft();
leftAxis.setTypeface(mTf);
leftAxis.setLabelCount(5, false);

YAxis rightAxis = mChart.getAxisRight();
rightAxis.setTypeface(mTf);
rightAxis.setLabelCount(5, false);
rightAxis.setDrawGridLines(false);

// set data
mChart.setData((LineData)generateDataLine(1));

// do not forget to refresh the chart
// holder.chart.invalidate();
mChart.animateX(750);
}

private LineData generateDataLine(int cnt) {

ArrayList<Entry> e1 = new ArrayList<Entry>();

for (int i = 0; i < 12; i++) {
e1.add(new Entry((int) (Math.random() * 65), i));
}

LineDataSet d1 = new LineDataSet(e1, "New DataSet " + cnt + ", (1)");
/*   d1.setLineWidth(2.5f);
d1.setCircleSize(4.5f);*/

d1.setLineWidth(2.5f);
d1.setCircleSize(5.5f);//折线的圆点大小
d1.setHighLightColor(Color.rgb(244, 117, 117));
d1.setDrawValues(true);

ArrayList<Entry> e2 = new ArrayList<Entry>();

for (int i = 0; i < 12; i++) {
e2.add(new Entry(e1.get(i).getVal() - 30, i));
}

ArrayList<LineDataSet> sets = new ArrayList<LineDataSet>();
sets.add(d1);

//这个图标坐标显示对应的坐标是按照顺序对应的，第一个y对应第一个x,这么来的
ArrayList<String> m = new ArrayList<String>();
m.add("9:00:37");
m.add("9:30:28");
m.add("10:00");
m.add("10:30");
m.add("May");
m.add("Jun");
m.add("12:00:59");
m.add("Aug");
m.add("Sep");
m.add("Okt");
m.add("Nov");
m.add("Dec");

LineData cd = new LineData(m, sets);
return cd;
}

@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);//添加菜单不调用该方法是没有用的
}

public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
// TODO Auto-generated method stub
menu.clear();
inflater.inflate(R.menu.backaj, menu);
super.onCreateOptionsMenu(menu, inflater);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == android.R.id.home)
{
getActivity().getActionBar().setDisplayHomeAsUpEnabled(false);
MainActivity mc =(MainActivity)getActivity();
mc.switchContent(this,getActivity().getSupportFragmentManager().findFragmentByTag("more"),"");
}
if(item.getItemId() == R.id.action_back)
{
MainActivity mc =(MainActivity)getActivity();
mc.switchContent(this,getActivity().getSupportFragmentManager().findFragmentByTag("more"),"");
}
return true;
}
}

4:常见异常处理
Typeface mTf = Typeface.createFromAsset(getActivity().getApplicationContext().getAssets(), "OpenSans-Regular.ttf");

java.lang.RuntimeException: native typeface cannot be made

需要把对应的文件复制到assets目录里边不然找不到这里的文件是OpenSans-Regular.ttf

5:mpandroidchart开源git地址 https://github.com/PhilJay/MPAndroidChart
git文档 https://github.com/PhilJay/MPAndroidChart/wiki
6:android mpandroidchart 设置y抽不从0开始,让y轴更具坐标自适应

YAxis yal =mChart.getAxisLeft();
yal.setStartAtZero(false);

YAxis yar =mChart.getAxisRight();
yar.setStartAtZero(false);