Question

我正在使用achartengine来显示饼图，我试过这个： -

public class AChartEnginePieChartActivity extends Activity {   

private static int[] COLORS = new int[] { Color.GREEN, Color.BLUE,Color.MAGENTA, Color.CYAN };  

private static double[] VALUES = new double[] { 10, 11, 12, 13 };  

private static String[] NAME_LIST = new String[] { "A", "B", "C", "D" };  

private CategorySeries mSeries = new CategorySeries("");  

private DefaultRenderer mRenderer = new DefaultRenderer();  

private GraphicalView mChartView;  

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

mRenderer.setApplyBackgroundColor(true);  
mRenderer.setBackgroundColor(Color.argb(100, 50, 50, 50));  
mRenderer.setChartTitleTextSize(20);  
mRenderer.setLabelsTextSize(15);  
mRenderer.setLegendTextSize(15);  
mRenderer.setMargins(new int[] { 20, 30, 15, 0 });  
mRenderer.setZoomButtonsVisible(true);  
mRenderer.setStartAngle(90);  

for (int i = 0; i < VALUES.length; i++) {  
mSeries.add(NAME_LIST[i] + " " + VALUES[i], VALUES[i]);  
SimpleSeriesRenderer renderer = new SimpleSeriesRenderer();  
renderer.setColor(COLORS[(mSeries.getItemCount() - 1) % COLORS.length]);  
mRenderer.addSeriesRenderer(renderer);  
}  

if (mChartView != null) {  
mChartView.repaint();  
}  

}  


@SuppressLint("ShowToast")
@Override  
protected void onResume() {  
super.onResume();  
if (mChartView == null) {  
LinearLayout layout = (LinearLayout) findViewById(R.id.chart);  
mChartView = ChartFactory.getPieChartView(this, mSeries, mRenderer);  
mRenderer.setClickEnabled(true);  
mRenderer.setSelectableBuffer(10);  

mChartView.setOnClickListener(new View.OnClickListener() {  
@Override  
public void onClick(View v) {  
SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();  

if (seriesSelection == null) {  
Toast.makeText(AChartEnginePieChartActivity.this,"No chart element was clicked",Toast.LENGTH_SHORT).show();  
} else {  
Toast.makeText(AChartEnginePieChartActivity.this,"Chart element data point index "+ (seriesSelection.getPointIndex()+1) + " was clicked" + " point value="+ seriesSelection.getValue(), Toast.LENGTH_SHORT).show();  
}  
}  
});  

mChartView.setOnLongClickListener(new View.OnLongClickListener() {  
@SuppressLint("ShowToast")
@Override  
public boolean onLongClick(View v) {  
SeriesSelection seriesSelection = mChartView.getCurrentSeriesAndPoint();  
if (seriesSelection == null) {  
Toast.makeText(AChartEnginePieChartActivity.this,"No chart element was long pressed", Toast.LENGTH_SHORT);  
return false;   
} else {  
Toast.makeText(AChartEnginePieChartActivity.this,"Chart element data point index "+ seriesSelection.getPointIndex()+ " was long pressed",Toast.LENGTH_SHORT);  
return true;         
}  
}  
});  
layout.addView(mChartView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));  
}  
else {  
mChartView.repaint();  
}  
}  
}

这里显示饼图Like this picture ..但我希望该值为百分比.. 像图片中的A（10％）B（11％）我怎样才能做到这一点？？？？？请建议我

Answer 1

尝试以下代码希望它有助于解决您的问题： -

mSeries.add(NAME_LIST[i] + "(" + VALUES[i]+"%)", VALUES[i]);

Answer 2

创建IValueFormatter：

public class MyValueFormatter implements IValueFormatter {

private DecimalFormat mFormat;

public MyValueFormatter() {
    mFormat = new DecimalFormat("###,###,##0.0"); // use one decimal
}

@Override
public String getFormattedValue(float value, Entry entry, int dataSetIndex, ViewPortHandler viewPortHandler) {
    // write your logic here
    return mFormat.format(value) + " %"; // e.g. append a dollar-sign
}}

接下来，将格式化程序设置为ChartData或DataSet对象：

dataSet.setValueFormatter(new MyValueFormatter());

请记住，这个内部类只会在值的末尾添加%。例如，如果您要添加$，则应使用$而不是%。

Answer 3

如果您为 Android 使用 MPAndroidChart，那么 IValueFormatter 现在已弃用。您需要使用 abstract class ValueFormatter

public class MyValueFormatter extends ValueFormatter {
private final DecimalFormat mFormat;

public MyValueFormatter() {
    mFormat = new DecimalFormat("###,###,##0.0"); // use one decimal
}

@Override
public String getFormattedValue(float value) {
    return mFormat.format(value) + " %"; // e.g. append percentage sign
}
}

然后就用它

data.setValueFormatter(MyValueFormatter())

其中 data 是您的 PieData

在Android中如何使用achartengine在饼图中显示百分比

3 个答案: