Hi!
I using Qt 5.4.1 Enterprise and used Qt Charts 2.0 module
I create Line Chart Example and build it to android device
My code:
Qt Code: 
  1. import QtQuick 2.4
  2. import QtQuick.Controls 1.3
  3. import QtQuick.Window 2.2
  4. import QtQuick.Dialogs 1.2
  5. import QtCharts 2.0
  6.  
  7. ApplicationWindow {
  8.     width: 640
  9.     height: 480
  10.     visible: true
  11.     property int currentIndex: -1
  12.     property int index_X: -1
  13.     property int index_Y: 50
  14.     property string driver: "Test"
  15.  
  16.     ChartView {
  17.         id: chartView
  18.         title: "TEST CHARTS"
  19.         anchors.fill: parent
  20.         legend.alignment: Qt.AlignTop
  21.         animationOptions: ChartView.SeriesAnimations
  22.         antialiasing: true
  23.         theme: ChartView.ChartThemeDark
  24.     }
  25.  
  26.     Timer {
  27.         id: timer
  28.         interval: 700
  29.         repeat: true
  30.         triggeredOnStart: true
  31.         running: true
  32.         onTriggered: {
  33.             currentIndex++;
  34.             index_Y = Math.random()*250
  35.             index_X ++;
  36.             if (currentIndex <= 20) {
  37.                 // Check if there is a series for the data already (we are using driver name to identify series)
  38.                 var lineSeries = chartView.series(driver);
  39.                 if (!lineSeries) {
  40.                     lineSeries = chartView.createSeries(ChartView.SeriesTypeLine, driver);
  41.                     chartView.axisY().min = 0;
  42.                     chartView.axisY().max = 250;
  43.                     chartView.axisY().tickCount = 6;
  44.                     chartView.axisX().titleText = "Time line";
  45.                     chartView.axisX().labelFormat = "%.0f";
  46.                 }
  47.                 lineSeries.append(index_X, index_Y);
  48.  
  49.                 if (index_X > 3) {
  50.                     chartView.axisX().max = index_X + 1;
  51.                     chartView.axisX().min = chartView.axisX().max - 5;
  52.                 } else {
  53.                     chartView.axisX().max = 5;
  54.                     chartView.axisX().min = 0;
  55.                 }
  56.                 chartView.axisX().tickCount = chartView.axisX().max - chartView.axisX().min + 1;
  57.             } else {
  58.                 // No more data, change x-axis range to show all the data
  59.                 timer.stop();
  60.                 chartView.animationOptions = ChartView.AllAnimations;
  61.                 chartView.axisX().min = 0;
  62.                 chartView.axisX().max = index_X;
  63.             }
  64.         }
  65.     }
  66.  
  67. }
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And now, I want to zoom charts using two finger as video below (from 1.59 - 2.02)

Please help me any idea. Thanks so much!