• Lucas
• diciembre 15, 2016

MPAndroidChart es una librería para Android utilizada para construir gráficos. Precisamente por su sencillez y riqueza de recursos, he decidido publicar este breve tutorial sobre cómo utilizarlo para construir un gráfico personalizado de Facturación X Mes. Usaremos MPAndroidChart v3.0.1 en nuestro ejemplo.

Repositorio y documentación oficial: https://github.com/PhilJay/MPAndroidChart

Demo

Para descargar el proyecto, haga clic aquí.

build.gradle:

apply plugin: 'com.android.application'

allprojects {
    repositories {
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.1"
    defaultConfig {
        applicationId "com.masterdaweb.androidchart"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.github.PhilJay:MPAndroidChart:v3.0.1'
}

MainActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import com.github.mikephil.charting.charts.LineChart;
import com.github.mikephil.charting.components.AxisBase;
import com.github.mikephil.charting.components.Description;
import com.github.mikephil.charting.components.XAxis;
import com.github.mikephil.charting.components.YAxis;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.data.LineData;
import com.github.mikephil.charting.data.LineDataSet;
import com.github.mikephil.charting.formatter.IAxisValueFormatter;
import com.github.mikephil.charting.highlight.Highlight;
import com.github.mikephil.charting.listener.OnChartValueSelectedListener;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends Activity {

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

        LineChart chart = (LineChart) findViewById(R.id.chart);
        //
        List<Entry> entries = new ArrayList<Entry>();
        entries.add(new Entry(1, 10f));
        entries.add(new Entry(2, 75f));
        entries.add(new Entry(3, 50f));
        entries.add(new Entry(3, 100f));
        entries.add(new Entry(4, 200f));

        XAxis xAxis = chart.getXAxis();
        xAxis.setValueFormatter(new MyXAxisValueFormatter());
        // Evita a duplicação dos meses na linha X
        xAxis.setGranularity(1f);

        YAxis yAxis = chart.getAxisLeft();
        yAxis.setValueFormatter(new MyYAxisValueFormatter());

        LineDataSet dataSet = new LineDataSet(entries, "Vendas");
        dataSet.setDrawFilled(true);
        dataSet.setDrawValues(false);
        LineData lineData = new LineData(dataSet);
        chart.setData(lineData);
        // Desativa o ZOOM do Touch
        chart.setDoubleTapToZoomEnabled(false);
        // Listener para exibir Toast ao tocar no gráfico
        chart.setOnChartValueSelectedListener(new OnChartValueSelectedListener() {
            @Override
            public void onValueSelected(Entry e, Highlight h) {
                Toast.makeText(MainActivity.this, "R$ " + e.getY(),
                        Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onNothingSelected() {

            }
        });
        // Efeito de animação
        chart.animateXY(3000, 3000);
        chart.invalidate();
    }

    // Formata os valores na linha X
    public class MyXAxisValueFormatter implements IAxisValueFormatter {

        private String[] mValues = {"Janeiro", "Fevereiro", "Março", "Abril", "Maio"};

        @Override
        public String getFormattedValue(float value, AxisBase axis) {
            Log.d("Teste", mValues[(int) value]);
            return mValues[(int) value];
        }
    }

    // Formata os valores na linha Y
    public class MyYAxisValueFormatter implements IAxisValueFormatter {

        @Override
        public String getFormattedValue(float value, AxisBase axis) {
            return "R$ " + value;
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    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"
    tools:context="com.masterdaweb.androidchart.MainActivity">

    <com.github.mikephil.charting.charts.LineChart
        android:id="@+id/chart"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />


</RelativeLayout>