圖表框架HelloCharts（1）線形圖

效果圖

1. 導入 .aar  

2.

fragment_line_chart.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
 >

    <lecho.lib.hellocharts.view.LineChartView
        android:id="@+id/chart"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </lecho.lib.hellocharts.view.LineChartView>

</RelativeLayout>

activity_line_chart.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
    />

3.

LineChartActivity.java

public class LineChartActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_line_chart);
        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction().add(R.id.container, new PlaceholderFragment()).commit();
        }
    }

    /**
     * A fragment containing a line chart.
     */
    public static class PlaceholderFragment extends Fragment {

        private LineChartView chart;
        private LineChartData data;
        private int numberOfLines = 1;
        private int maxNumberOfLines = 4;
        private int numberOfPoints = 12;

        float[][] randomNumbersTab = new float[maxNumberOfLines][numberOfPoints];

        private boolean hasAxes = true;
        private boolean hasAxesNames = true;
        private boolean hasLines = true;
        private boolean hasPoints = true;
        private ValueShape shape = ValueShape.CIRCLE;
        private boolean isFilled = false;
        private boolean hasLabels = false;
        private boolean isCubic = false;
        private boolean hasLabelForSelected = false;
        private boolean pointsHaveDifferentColor;

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            setHasOptionsMenu(true);
            View rootView = inflater.inflate(R.layout.fragment_line_chart, container, false);

            chart = (LineChartView) rootView.findViewById(R.id.chart);
            chart.setOnValueTouchListener(new ValueTouchListener());

            // 產生一些隨機值。
            generateValues();

            generateData();

            // 禁用視圖重新計算，更多信息參見togglecubic()方法。
            chart.setViewportCalculationEnabled(false);

            resetViewport();

            return rootView;
        }

        //每一個列的值
        private void generateValues() {
            for (int i = 0; i < maxNumberOfLines; ++i) {
                for (int j = 0; j < numberOfPoints; ++j) {
                   // randomNumbersTab[i][j] = (float) Math.random() * 100f;
                    randomNumbersTab[i][j] =5;
                }
            }
        }


        private void resetViewport() {
            // Reset viewport height range to (0,100)
            final Viewport v = new Viewport(chart.getMaximumViewport());
            v.bottom = 0;
            v.top = 100;
            v.left = 0;
            v.right = numberOfPoints - 1;
            chart.setMaximumViewport(v);
            chart.setCurrentViewport(v);
        }
        //generate 生成
        private void generateData() {

            List<Line> lines = new ArrayList<Line>();
            for (int i = 0; i < numberOfLines; ++i) {

                List<PointValue> values = new ArrayList<PointValue>();
                for (int j = 0; j < numberOfPoints; ++j) {
                    values.add(new PointValue(j, randomNumbersTab[i][j]));
                }

                Line line = new Line(values);
                line.setColor(ChartUtils.COLORS[i]);
                line.setShape(shape);
                line.setCubic(isCubic);
                line.setFilled(isFilled);
                line.setHasLabels(hasLabels);
                line.setHasLabelsOnlyForSelected(hasLabelForSelected);
                line.setHasLines(hasLines);
                line.setHasPoints(hasPoints);
                if (pointsHaveDifferentColor){
                    line.setPointColor(ChartUtils.COLORS[(i + 1) % ChartUtils.COLORS.length]);
                }
                lines.add(line);
            }

            data = new LineChartData(lines);

            if (hasAxes) {
                Axis axisX = new Axis();
                Axis axisY = new Axis().setHasLines(true);
                if (hasAxesNames) {
                    axisX.setName("Axis X");
                    axisY.setName("Axis Y");
                }
                data.setAxisXBottom(axisX);
                data.setAxisYLeft(axisY);
            } else {
                data.setAxisXBottom(null);
                data.setAxisYLeft(null);
            }

            data.setBaseValue(Float.NEGATIVE_INFINITY);
            chart.setLineChartData(data);

        }
        private class ValueTouchListener implements LineChartOnValueSelectListener {

            @Override
            public void onValueSelected(int lineIndex, int pointIndex, PointValue value) {
                Toast.makeText(getActivity(), "Selected: " + value, Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onValueDeselected() {
                // TODO Auto-generated method stub

            }

        }
    }
}