問題使用MPPiechart庫

Question

MainActivity類別代碼時，顯示餅圖上MarkerView：

private float[] yData = {25, 35, 40}; 
private String[] xData = {"x", "y", "z"}; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    mainLayout = (RelativeLayout) findViewById(R.id.layot); 
    mChart = (PieChart) findViewById(R.id.view); 


    mainLayout.setBackgroundColor(Color.parseColor("#ffffff")); 
    mChart.setUsePercentValues(true); 
    mChart.setMaxAngle(360); 
    mChart.setDrawHoleEnabled(true); 
    mChart.setHoleRadius(2); 
    mChart.setRotationAngle(360); 
    mChart.setRotationEnabled(false); 
    mChart.setHighlightPerTapEnabled(false); 
    mChart.setTransparentCircleRadius(0); 

    ImageView imageView=new ImageView(this); 
    imageView.setImageResource(R.mipmap.ic_launcher); 

    LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(100, 100); 
    imageView.setLayoutParams(layoutParams); 

    mChart.setOnChartValueSelectedListener(new OnChartValueSelectedListener() { 

     @Override 
     public void onValueSelected(Entry e, int dataSetIndex, Highlight h) { 
      // display msg when value selected 
      if (e == null) 
       return; 

      Toast.makeText(MainActivity.this, 
        xData[e.getXIndex()] + " = " + e.getVal() + "%", Toast.LENGTH_SHORT).show(); 
     } 

     @Override 
     public void onNothingSelected() { 

     } 
    }); 

    addData(); 
    MyMarkerView mv = new MyMarkerView(getApplicationContext(), R.layout.marker_layout); 

    mChart.setMarkerView(mv); 


} 

private void addData() { 
    ArrayList<Entry> entries = new ArrayList<>(); 
    for (int i=0;i<yData.length;i++){ 
     entries.add(new Entry(yData[i],i)); 
    } 
    PieDataSet dataset = new PieDataSet(entries, "# of Calls"); 
    dataset.setSliceSpace(0); 
    dataset.setColors(ColorTemplate.COLORFUL_COLORS); 
    ArrayList<String> labels = new ArrayList<String>(); 
    for (int i=0;i<xData.length;i++){ 
     labels.add(xData[i]); 
    } 
    PieData data = new PieData(labels, dataset); // initialize Piedata 
    mChart.setData(data); 
    mChart.setDescription("Description"); 
    mChart.animateY(2000); 
} 

和MyMarkerView類

public MyMarkerView(Context context, int layoutResource) { 
    super(context, layoutResource); 

    tvContent = (TextView) findViewById(R.id.tvContent); 
    tvContent.setText("xyz"); 
} 

// callbacks everytime the MarkerView is redrawn, can be used to update the 
// content (user-interface) 
@Override 
public void refreshContent(Entry e, Highlight highlight) { 

    if (e instanceof CandleEntry) { 

     CandleEntry ce = (CandleEntry) e; 

     tvContent.setText("" + Utils.formatNumber(ce.getHigh(), 0, true)); 
    } else { 

     tvContent.setText("" + Utils.formatNumber(e.getVal(), 0, true)); 
    } 
} 

@Override 
public int getXOffset(float xpos) { 
    // this will center the marker-view horizontally 
    return (getWidth()/2); 
} 

@Override 
public int getYOffset(float ypos) { 
    // this will cause the marker-view to be above the selected value 
    return getHeight(); 
} 

我使用此代碼爲餅圖上標記，但沒有顯示任何東西在圖表上。我的代碼中有任何錯誤嗎？請幫忙。

Answer 1

你的代碼一見鍾情。 也許只是補充：

mchart.setDrawMarkerViews(true); 

您customMarkerView連接到圖表後。