我在我的 android 应用程序中实现了 Mpandroid 饼图，我做了一个 BMI 计算器，我想根据我得到的 BMI 结果突出显示饼图的特定部分。有没有关于如何突出显示的解决方案一个特定的切片而不接触它。例如。如果 BMI 在 10-20 之间，则应突出显示范围为 10-20 的特定切片。 我不希望我的触摸突出显示切片，我希望它根据我获得的 BMI 结果自动发生。
这是我的代码-->
Activity_main.java
public class MainActivity extends AppCompatActivity
{
private RadioGroup radioSexGroup;
private RadioButton radioSexButton;
private int selectedId;
private EditText age;
private EditText height;
private EditText weight;
// private TextView result;
private TextView t1;
private Spinner height_spinner;
private Spinner weight_spinner;
private Button calculate;
private PieChart mChart;
String spinner_height; //Height Spinner
String spinner_weight; //Weight Spinner
String selected_item1;
String selected_item2;
float bmi=0f;
protected String[] BMIcategory = new String[]
{
"Very Severly Underweight", "Severly Underweight", "Underweight", "Normal",
"Overweight", "Obese Class I", "Obese Class II", "Obese Class III",
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
setTitle("BMI Calculator");
radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
selectedId = radioSexGroup.getCheckedRadioButtonId();
radioSexButton = (RadioButton) findViewById(selectedId);
mChart=(PieChart)findViewById(R.id.chart);
age=(EditText) findViewById(R.id.age);
height=(EditText) findViewById(R.id.height);
weight=(EditText) findViewById(R.id.weight);
// result=(TextView) findViewById(result);
t1=(TextView) findViewById(R.id.text1);
t1.setText("<16.00");
height_spinner=(Spinner) findViewById(R.id.height_spinner);
weight_spinner=(Spinner) findViewById(R.id.weight_spinner);
calculate=(Button) findViewById(R.id.calculate_button);
setchart();
calculate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
calculate();
}
});
set_spinner();
}
public void setchart()
{
mChart.setBackgroundColor(Color.rgb(255,255,255));
mChart.setUsePercentValues(false);
mChart.getDescription().setEnabled(false);
mChart.setDrawCenterText(true);
mChart.setCenterTextTypeface(Typeface.DEFAULT_BOLD);
mChart.setCenterTextColor(Color.BLACK);
mChart.setCenterTextSize(18f);
mChart.setCenterText("BMI:");
mChart.setDrawHoleEnabled(true);
mChart.setHoleColor(Color.rgb(255,255,255));
mChart.setTransparentCircleColor(Color.rgb(255,255,255));
mChart.setTransparentCircleAlpha(110);
mChart.setHoleRadius(65f);
mChart.setTransparentCircleRadius(68f);
mChart.setDrawSliceText(false);
mChart.setDrawEntryLabels(false);
mChart.setRotationEnabled(false);
mChart.setHighlightPerTapEnabled(false);
mChart.setMaxAngle(270f); // HALF CHART
mChart.setRotationAngle(135f);
setData(8, 80);
}
private void setData(int count, float range) {
ArrayList<PieEntry> values = new ArrayList<>();
values.add(new PieEntry(10f,BMIcategory[0]));
values.add(new PieEntry(15f,BMIcategory[1]));
values.add(new PieEntry(8f,BMIcategory[2]));
values.add(new PieEntry(12f,BMIcategory[3]));
values.add(new PieEntry(5f,BMIcategory[4]));
values.add(new PieEntry(5f,BMIcategory[5]));
values.add(new PieEntry(15f,BMIcategory[6]));
values.add(new PieEntry(10f,BMIcategory[7]));
PieDataSet dataSet = new PieDataSet(values, "BMI Category");
dataSet.setSliceSpace(0f);
dataSet.setSelectionShift(5f);
// dataSet.setColors(Colors);
// add many colors
ArrayList<Integer> colors = new ArrayList<Integer>();
colors.add(Color.rgb(31,127,218));
colors.add(Color.rgb(37,169,254));
colors.add(Color.rgb(63,200,247));
colors.add(Color.rgb(65,189,103));
colors.add(Color.rgb(243,207,0));
colors.add(Color.rgb(248,154,20));
colors.add(Color.rgb(238,87,59));
colors.add(Color.rgb(171,18,14));
dataSet.setColors(colors);
PieData data = new PieData(dataSet);
data.setDrawValues(false);
mChart.setData(data);
mChart.invalidate();
}
public void set_spinner(){
ArrayAdapter<CharSequence> adapter1 = ArrayAdapter.createFromResource(this, R.array.height_spinner_array, android.R.layout.simple_spinner_item);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
height_spinner.setAdapter(adapter1);
height_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
int a = parent.getSelectedItemPosition();
spinner_height = height_spinner.getSelectedItem().toString();
if (a == 0) {
selected_item1="Inches";
}
if(a==1)
{
selected_item1="Centimeters";
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// Another interface callback
}
});
ArrayAdapter<CharSequence> adapter2 = ArrayAdapter.createFromResource(this, R.array.weight_spinner_array, android.R.layout.simple_spinner_item);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
weight_spinner.setAdapter(adapter2);
weight_spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
int b = parent.getSelectedItemPosition();
spinner_weight = weight_spinner.getSelectedItem().toString();
if(b==0)
{
selected_item2="Kgs";
}
if(b==1)
{
selected_item2="Lbs";
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {} } );
}
public void calculate() {
// mChart=(PieChart)findViewById(R.id.chart);
mChart.setDrawCenterText(true);
mChart.setCenterTextTypeface(Typeface.DEFAULT_BOLD);
mChart.setCenterTextColor(Color.BLACK);
mChart.setCenterTextSize(18f);
float getHeight, getWeight;
DecimalFormat df = new DecimalFormat("#0.00");
if (height.getText().toString().equals("")) {
getHeight = 0f;
} else {
getHeight = Float.parseFloat(height.getText().toString());
}
if (weight.getText().toString().equals("")) {
getWeight = 0f;
} else {
getWeight = Float.parseFloat(weight.getText().toString());
}
if(height.getText().toString().equals("") || weight.getText().toString().equals("") || age.getText().toString().equals(""))
{
bmi=0f;
mChart.invalidate();
mChart.setCenterText("BMI:");
mChart.invalidate();
Toast.makeText(this,"Please Enter All the Values",Toast.LENGTH_SHORT).show();
return;
}
if(selected_item1.equals("Inches"))
{
if(selected_item2.equals("Kgs"))
{
bmi = (getWeight*10000f) / (2.54f*2.54f*getHeight * getHeight);
}
if(selected_item2.equals("Lbs"))
{
bmi = (getWeight*0.453592f*10000f) / (getHeight * getHeight*2.54f*2.54f);
}
}
if(selected_item1.equals("Centimeters"))
{
if(selected_item2.equals("Kgs"))
{
bmi = (getWeight*10000) / (getHeight * getHeight);
}
if(selected_item2.equals("Lbs"))
{
bmi=(getWeight*0.453592f*10000) / (getHeight * getHeight);
}
}
mChart.setCenterText("BMI:"+df.format(bmi));
mChart.invalidate();
}
@Override
public void onBackPressed() {
super.onBackPressed();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
最佳答案
对于所有图表类型，您可以使用 highlightValue(float x, int dataSetIndex, boolean callListener) 以编程方式设置突出显示。
在您的情况下，您需要确定 BMI 类别索引，因为这将为您提供第一个参数。假设您这样做了，并将正确的位置存储在某个变量 categoryIndex 中。
第二个参数将始终为零，因为您只有一个 DataSet。
第三个参数应该是false，因为你不需要监听任何事件，毕竟是你的代码触发了高亮。
现在您可以像这样突出显示图表的相应部分:
public void calculate() {
...
mChart.setCenterText("BMI:"+df.format(bmi));
mChart.highlightValue(categoryIndex, 0, false);
mChart.invalidate();
}
注意:highlightValue() 有多个重载版本，另请参阅 documentation对于 MPAndroidChart
关于java - 如何在不触摸的情况下突出显示 mpandroid 饼图的特定部分？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40726716/