MPAndroid组条形图未显示
作者:互联网
这个问题已经在这里有了答案: > How to check if activity is in foreground or in visible background? 22个
这是我用于使用MPAndroid库版本3的组bar_chart的代码.此代码不起作用.没有崩溃和错误日志,仍在加载图形,并且没有数据显示.帮我找出毛病
List<BarEntry> entriesGroup1 = new ArrayList<>();
List<BarEntry> entriesGroup2 = new ArrayList<>();
List<BarEntry> entriesGroup3 = new ArrayList<>();
entriesGroup1.add(new BarEntry(0, 8f));
entriesGroup1.add(new BarEntry(1, 2f));
entriesGroup1.add(new BarEntry(2, 5f));
entriesGroup1.add(new BarEntry(3, 20f));
entriesGroup1.add(new BarEntry(4, 15f));
entriesGroup1.add(new BarEntry(5, 19f));
entriesGroup2.add(new BarEntry(0, 6f));
entriesGroup2.add(new BarEntry(1, 10f));
entriesGroup2.add(new BarEntry(2, 5f));
entriesGroup2.add(new BarEntry(3, 25f));
entriesGroup2.add(new BarEntry(4, 4f));
entriesGroup2.add(new BarEntry(5, 17f));
entriesGroup3.add(new BarEntry(0, 9f));
entriesGroup3.add(new BarEntry(1, 1f));
entriesGroup3.add(new BarEntry(2, 15f));
entriesGroup3.add(new BarEntry(3, 13f));
entriesGroup3.add(new BarEntry(4, 40f));
entriesGroup3.add(new BarEntry(5, 25f));
BarDataSet set1 = new BarDataSet(entriesGroup1, "Group 1");
BarDataSet set2 = new BarDataSet(entriesGroup2, "Group 2");
BarDataSet set3 = new BarDataSet(entriesGroup3, "Group 3");
final ArrayList<String> labels = new ArrayList<String>();
labels.add("2016");
labels.add("2015");
labels.add("2014");
labels.add("2013");
labels.add("2012");
labels.add("2011");
IAxisValueFormatter formatter = new IAxisValueFormatter() {
@Override
public String getFormattedValue(float value, AxisBase axis) {
if((int) value < 0 || (int) value >= labels.size()){
return "";
}else{
return labels.get((int) value);
}
}
// we don't draw numbers, so no decimal digits needed
@Override
public int getDecimalDigits() { return 0; }
};
set1.setColor(Color.parseColor("#cd5080"));
set2.setColor(Color.parseColor("#0d5080"));
set3.setColor(Color.parseColor("#fc5080"));;
float groupSpace = 0.06f;
float barSpace = 0.02f; // x2 dataset
float barWidth = 0.45f; // x2 dataset
// (0.02 + 0.45) * 2 + 0.06 = 1.00 -> interval per "group"
XAxis xAxis = barChart.getXAxis();
xAxis.setCenterAxisLabels(true);
xAxis.setGranularity(1f); // minimum axis-step (interval) is 1
xAxis.setValueFormatter(formatter);
BarData data = new BarData(set1, set2, set3);
data.setBarWidth(barWidth); // set the width of each bar
barChart.setData(data);
barChart.groupBars(2016, groupSpace, barSpace);
barChart.invalidate(); // refresh
barChart.animateY(5000);
Nb:因为我被禁止提出新问题,所以我已经编辑了当前的问题.但这对我很重要.感谢大家.
解决方法:
这不是我的答案,我以前看过这些问题,并在我的应用程序中实现,它像一种魅力.找不到原始答案的链接,所以我要张贴我使用的代码.
您可以使用ActivityLifecycleCallbacks:
public class AppTransitionStatus implements Application.ActivityLifecycleCallbacks {
private static final long MAX_BACKGROUND_TIME = 2000;
private Timer timer;
private TimerTask task;
private boolean isBackground;
private final Transition transition;
private void goToForeground(Activity iActivity) {
transition.appToForeground(iActivity);
}
private void goToBackground() {
transition.appToBackground();
}
private void stopTimer() {
if (task != null) task.cancel();
if (timer != null) timer.cancel();
}
public AppTransitionStatus(@NonNull Transition transition) {
this.transition = transition;
}
@Override
public void onActivityCreated(Activity activity, Bundle bundle) {
}
@Override
public void onActivityStarted(Activity activity) {
}
@Override
public void onActivityResumed(Activity activity) {
if (isBackground) {
goToForeground(activity);
}
stopTimer();
isBackground = false;
}
@Override
public void onActivityPaused(Activity activity) {
timer = new Timer();
task = new TimerTask() {
public void run() {
isBackground = true;
goToBackground();
}
};
timer.schedule(task, MAX_BACKGROUND_TIME);
}
@Override
public void onActivityStopped(Activity activity) {
}
@Override
public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
}
@Override
public void onActivityDestroyed(Activity activity) {
}
public interface Transition {
void appToForeground(Activity iActivity);
void appToBackground();
}
}
然后可以在您的应用程序类中注册
registerActivityLifecycleCallbacks(new AppTransitionStatus(new AppTransitionStatus.Transition() {
@Override
public void appToForeground(Activity iActivity) {
Log.d("Transition", "App in Foreground");
}
@Override
public void appToBackground() {
Log.d("Transition", "App in Background");
}
}));
标签:mpandroidchart,android,bar-chart 来源: https://codeday.me/bug/20191010/1886416.html