在barChart上调用animateY时,将重绘整个图表,将条形图从y-zero设置为y-new.
barChart.invalidate(); barChart.animateY(1000);
是否可以将动画限制为值更改.因此,允许用户看到图表如何从y-old(例如100)增长到y-new(例如120)？
解决方法
我遇到了同样的问题,无法找到解决方案.所以,我创建了一个可以调用来处理这种任务的类.
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import com.github.mikephil.charting.charts.BarLineChartBase;
import com.github.mikephil.charting.charts.Chart;
import com.github.mikephil.charting.data.Entry;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import android.os.Handler;
public class AnimateDataSetChanged {
private int duration;
private long startTime;
private int fps = 30;
private Handler timerHandler;
private Chart chart;
private List<Entry> oldData;
private List<Entry> newData;
private Interpolator interpolator;
public AnimateDataSetChanged(int duration,Chart chart,List<Entry> oldData,List<Entry> newData){
this.duration = duration;
this.chart = chart;
this.oldData = new ArrayList<>(oldData);
this.newData = new ArrayList<>(newData);
interpolator = new LinearInterpolator();
}
public void setInterpolator(Interpolator interpolator){
this.interpolator = interpolator;
}
public void run(int fps){
this.fps = fps;
run();
}
public void run(){
startTime = Calendar.getInstance().getTimeInMillis();
timerHandler = new Handler();
Runner runner = new Runner();
runner.run();
}
private class Runner implements Runnable{
@Override
public void run() {
float increment = (Calendar.getInstance().getTimeInMillis() - startTime) / (float)duration;
increment = interpolator.getInterpolation(increment < 0f ? 0f : increment > 1f ? 1f :increment);
chart.getData().getDataSetByIndex(0).clear();
for(int i = 0; i < newData.size(); i++){
float oldY = oldData.size() > i ? oldData.get(i).getY() : newData.get(i).getY();
float oldX = oldData.size() > i ? oldData.get(i).getX() : newData.get(i).getX();
float newX = newData.get(i).getX();
float newY = newData.get(i).getY();
Entry e = new Entry(oldX + (newX - oldX) * increment,oldY + (newY - oldY) * increment);
chart.getData().getDataSetByIndex(0).addEntry(e);
}
chart.getXAxis().resetAxisMaximum();
chart.getXAxis().resetAxisMinimum();
chart.notifyDataSetChanged();
chart.refreshDrawableState();
chart.invalidate();
if(chart instanceof BarLineChartBase){
((BarLineChartBase)chart).setAutoScaleMinMaxEnabled(true);
}
if(increment < 1f){
timerHandler.postDelayed(this,1000/fps);
}
}
}
}
你可以像这样调用这个类：
List<Entry> oldEntries = ... List<Entry> newEntries = ... AnimateDataSetChanged changer = new AnimateDataSetChanged(600,mChart,oldEntries,currentDataEntries); changer.setInterpolator(new AccelerateInterpolator()); // optionally set the Interpolator changer.run();
