//圖表庫implementation 'com.github.PhilJay:MPAndroidChart:v3.1.0'

X軸：XAxis
Y軸：YAxis
圖例：Legend
描述：Description
限制線：LimitLine
顯示的視圖：MarkerView (就是選擇中的時候顯示的樣子)

餅圖英文學名為Sector Graph，又名Pie Graph。常用于統計學模塊。2D餅圖為圓形，手畫時，常用圓規作圖。僅排列在工作表的一列或一行中的數據可以繪制到餅圖中。餅圖顯示一個數據系列

package com.xxmassdeveloper.mpchartexample.notimportant;import android.Manifest; import android.content.pm.PackageManager; import android.graphics.Typeface; import android.os.Bundle; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import com.google.android.material.snackbar.Snackbar;import androidx.appcompat.app.AppCompatActivity; import androidx.core.app.ActivityCompat; import android.view.View; import android.widget.Toast;import com.github.mikephil.charting.charts.Chart; import com.sbas.xueliapplication.R;/*** Base class of all Activities of the Demo Application.** @author Philipp Jahoda*/ public abstract class DemoBase extends AppCompatActivity implements ActivityCompat.OnRequestPermissionsResultCallback {protected final String[] months = new String[] {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Okt", "Nov", "Dec"};protected final String[] parties = new String[] {"Party A", "Party B", "Party C", "Party D", "Party E", "Party F", "Party G", "Party H","Party I", "Party J", "Party K", "Party L", "Party M", "Party N", "Party O", "Party P","Party Q", "Party R", "Party S", "Party T", "Party U", "Party V", "Party W", "Party X","Party Y", "Party Z"};private static final int PERMISSION_STORAGE = 0;protected Typeface tfRegular;protected Typeface tfLight;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);tfRegular = Typeface.createFromAsset(getAssets(), "OpenSans-Regular.ttf");tfLight = Typeface.createFromAsset(getAssets(), "OpenSans-Light.ttf");}protected float getRandom(float range, float start) {return (float) (Math.random() * range) + start;}@Overridepublic void onBackPressed() {super.onBackPressed();overridePendingTransition(R.anim.move_left_in_activity, R.anim.move_right_out_activity);}@Overridepublic void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {if (requestCode == PERMISSION_STORAGE) {if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {saveToGallery();} else {Toast.makeText(getApplicationContext(), "Saving FAILED!", Toast.LENGTH_SHORT).show();}}}protected void requestStoragePermission(View view) {if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {Snackbar.make(view, "Write permission is required to save image to gallery", Snackbar.LENGTH_INDEFINITE).setAction(android.R.string.ok, new View.OnClickListener() {@Overridepublic void onClick(View v) {ActivityCompat.requestPermissions(DemoBase.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_STORAGE);}}).show();} else {Toast.makeText(getApplicationContext(), "Permission Required!", Toast.LENGTH_SHORT).show();ActivityCompat.requestPermissions(DemoBase.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_STORAGE);}}protected void saveToGallery(Chart chart, String name) {if (chart.saveToGallery(name + "_" + System.currentTimeMillis(), 70))Toast.makeText(getApplicationContext(), "Saving SUCCESSFUL!",Toast.LENGTH_SHORT).show();elseToast.makeText(getApplicationContext(), "Saving FAILED!", Toast.LENGTH_SHORT).show();}protected abstract void saveToGallery(); } <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"><RelativeLayoutandroid:layout_width="222px"android:layout_height="400px"><com.github.mikephil.charting.charts.PieChartandroid:id="@+id/chart1"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_above="@+id/seekBar1" /><SeekBarandroid:id="@+id/seekBar2"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignParentLeft="true"android:layout_alignParentBottom="true"android:layout_margin="8dp"android:layout_marginRight="5dp"android:layout_toLeftOf="@+id/tvYMax"android:max="200"android:paddingBottom="12dp"android:visibility="gone" /><SeekBarandroid:id="@+id/seekBar1"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_above="@+id/seekBar2"android:layout_margin="8dp"android:layout_marginRight="5dp"android:layout_marginBottom="35dp"android:layout_toLeftOf="@+id/tvXMax"android:max="25"android:paddingBottom="12dp"android:visibility="gone" /><TextViewandroid:id="@+id/tvXMax"android:layout_width="50dp"android:layout_height="wrap_content"android:layout_alignBottom="@+id/seekBar1"android:layout_alignParentRight="true"android:layout_marginRight="10dp"android:layout_marginBottom="15dp"android:gravity="right"android:text="@string/dash"android:textAppearance="?android:attr/textAppearanceMedium"android:visibility="gone" /><TextViewandroid:id="@+id/tvYMax"android:layout_width="50dp"android:layout_height="wrap_content"android:layout_alignBottom="@+id/seekBar2"android:layout_alignParentRight="true"android:layout_marginRight="10dp"android:layout_marginBottom="15dp"android:gravity="right"android:text="@string/dash"android:textAppearance="?android:attr/textAppearanceMedium"android:visibility="gone" /></RelativeLayout><LinearLayoutandroid:layout_marginTop="500px"android:layout_width="match_parent"android:layout_height="wrap_content"><Buttonandroid:id="@+id/actionToggleYValues"android:text="是否顯示Y軸文字"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/actionToggleXValues"android:text="是否顯示X軸文字"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/actionToggleIcons"android:text="是否顯示Icons"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/actionTogglePercent"android:text="是否顯示百分比"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/actionToggleMinAngles"android:text="是否顯示最小角"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/actionToggleHole"android:text="是否顯示中間洞"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout><LinearLayoutandroid:layout_marginTop="590px"android:layout_width="match_parent"android:layout_height="wrap_content"><Buttonandroid:id="@+id/actionToggleCurvedSlices"android:text="是否顯示彎曲"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/actionDrawCenter"android:text="是否顯示中間文字"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/actionToggleSpin"android:text="旋轉動畫"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/animateX"android:text="X軸動畫"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/animateY"android:text="Y軸動畫"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/animateXY"android:text="XY軸動畫"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:id="@+id/actionSave"android:text="保存"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout></RelativeLayout> package com.xxmassdeveloper.mpchartexample; import com.sbas.xueliapplication.R;import android.Manifest; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Color; import android.graphics.Typeface; import android.net.Uri; import android.os.Bundle; import androidx.core.content.ContextCompat; import android.text.SpannableString; import android.text.style.ForegroundColorSpan; import android.text.style.RelativeSizeSpan; import android.text.style.StyleSpan; import android.util.Log; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.WindowManager; import android.widget.Button; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import android.widget.TextView;import com.github.mikephil.charting.animation.Easing; import com.github.mikephil.charting.charts.PieChart; import com.github.mikephil.charting.components.Legend; import com.github.mikephil.charting.data.Entry; import com.github.mikephil.charting.data.PieData; import com.github.mikephil.charting.data.PieDataSet; import com.github.mikephil.charting.data.PieEntry; import com.github.mikephil.charting.formatter.PercentFormatter; import com.github.mikephil.charting.highlight.Highlight; import com.github.mikephil.charting.interfaces.datasets.IDataSet; import com.github.mikephil.charting.listener.OnChartValueSelectedListener; import com.github.mikephil.charting.utils.ColorTemplate; import com.github.mikephil.charting.utils.MPPointF; import com.xxmassdeveloper.mpchartexample.notimportant.DemoBase;import java.util.ArrayList;public class PieChartActivity extends DemoBase implements OnSeekBarChangeListener,OnChartValueSelectedListener,View.OnClickListener {private PieChart pieChart;private SeekBar seekBarX, seekBarY;private TextView tvX, tvY;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.activity_piechart);setTitle("PieChartActivity");tvX = findViewById(R.id.tvXMax);tvY = findViewById(R.id.tvYMax);seekBarX = findViewById(R.id.seekBar1);seekBarY = findViewById(R.id.seekBar2);seekBarX.setOnSeekBarChangeListener(this);seekBarY.setOnSeekBarChangeListener(this);pieChart = findViewById(R.id.chart1);pieChart.setUsePercentValues(true);pieChart.getDescription().setEnabled(false);pieChart.setExtraOffsets(5, 10, 5, 5);pieChart.setDragDecelerationFrictionCoef(0.95f);pieChart.setCenterTextTypeface(tfLight);pieChart.setCenterText(generateCenterSpannableText());pieChart.setDrawHoleEnabled(true);pieChart.setHoleColor(Color.WHITE);pieChart.setTransparentCircleColor(Color.WHITE);pieChart.setTransparentCircleAlpha(110);pieChart.setHoleRadius(58f);pieChart.setTransparentCircleRadius(61f);pieChart.setDrawCenterText(true);pieChart.setRotationAngle(0);// enable rotation of the chart by touchpieChart.setRotationEnabled(true);pieChart.setHighlightPerTapEnabled(true);// chart.setUnit(" €");// chart.setDrawUnitsInChart(true);// add a selection listenerpieChart.setOnChartValueSelectedListener(this);seekBarX.setProgress(5);seekBarY.setProgress(10);pieChart.animateY(1400, Easing.EaseInOutQuad);// chart.spin(2000, 0, 360);//設置頂部 什么顏色代表什么東西。Legend l = pieChart.getLegend();l.setVerticalAlignment(Legend.LegendVerticalAlignment.BOTTOM);l.setHorizontalAlignment(Legend.LegendHorizontalAlignment.CENTER);l.setOrientation(Legend.LegendOrientation.HORIZONTAL);l.setDrawInside(true);l.setXEntrySpace(7f);l.setYEntrySpace(0f);l.setYOffset(0f);l.setWordWrapEnabled(true);// entry label stylingpieChart.setEntryLabelColor(Color.WHITE);pieChart.setEntryLabelTypeface(tfRegular);pieChart.setEntryLabelTextSize(12f);initButton();}private void initButton() {Button actionToggleYValues = findViewById(R.id.actionToggleYValues);actionToggleYValues.setOnClickListener(this::onClick);Button actionToggleXValues = findViewById(R.id.actionToggleXValues);actionToggleXValues.setOnClickListener(this::onClick);Button actionToggleIcons = findViewById(R.id.actionToggleIcons);actionToggleIcons.setOnClickListener(this::onClick);Button actionTogglePercent = findViewById(R.id.actionTogglePercent);actionTogglePercent.setOnClickListener(this::onClick);Button actionToggleMinAngles = findViewById(R.id.actionToggleMinAngles);actionToggleMinAngles.setOnClickListener(this::onClick);Button actionToggleHole = findViewById(R.id.actionToggleHole);actionToggleHole.setOnClickListener(this::onClick);Button actionToggleCurvedSlices = findViewById(R.id.actionToggleCurvedSlices);actionToggleCurvedSlices.setOnClickListener(this::onClick);Button actionDrawCenter = findViewById(R.id.actionDrawCenter);actionDrawCenter.setOnClickListener(this::onClick);Button actionToggleSpin = findViewById(R.id.actionToggleSpin);actionToggleSpin.setOnClickListener(this::onClick);Button animateX = findViewById(R.id.animateX);animateX.setOnClickListener(this::onClick);Button animateY = findViewById(R.id.animateY);animateY.setOnClickListener(this::onClick);Button animateXY = findViewById(R.id.animateXY);animateXY.setOnClickListener(this::onClick);Button actionSave = findViewById(R.id.actionSave);actionSave.setOnClickListener(this::onClick);}private void setData_count_range(int count, float range) {ArrayList<PieEntry> entries = new ArrayList<>();// NOTE: The order of the entries when being added to the entries array determines their position around the center of// the chart.for (int i = 0; i < count ; i++) {float v =(float) ((Math.random() * range) + range / 5);Log.e("tag",v+" setData_count_range");entries.add(new PieEntry(v,parties[i % parties.length],getResources().getDrawable(R.drawable.star)));}PieDataSet dataSet = new PieDataSet(entries, "Election Results");dataSet.setDrawIcons(false);dataSet.setSliceSpace(3f);dataSet.setIconsOffset(new MPPointF(0, 40));dataSet.setSelectionShift(5f);// add a lot of colorsArrayList<Integer> colors = new ArrayList<>();for (int c : ColorTemplate.VORDIPLOM_COLORS)colors.add(c);for (int c : ColorTemplate.JOYFUL_COLORS)colors.add(c);for (int c : ColorTemplate.COLORFUL_COLORS)colors.add(c);for (int c : ColorTemplate.LIBERTY_COLORS)colors.add(c);for (int c : ColorTemplate.PASTEL_COLORS)colors.add(c);colors.add(ColorTemplate.getHoloBlue());dataSet.setColors(colors);//dataSet.setSelectionShift(0f);PieData data = new PieData(dataSet);data.setValueFormatter(new PercentFormatter());data.setValueTextSize(11f);data.setValueTextColor(Color.WHITE);data.setValueTypeface(tfLight);pieChart.setData(data);// undo all highlightspieChart.highlightValues(null);pieChart.invalidate();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) { return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {switch (item.getItemId()) {case R.id.viewGithub: {Intent i = new Intent(Intent.ACTION_VIEW);i.setData(Uri.parse("https://github.com/PhilJay/MPAndroidChart/blob/master/MPChartExample/src/com/xxmassdeveloper/mpchartexample/PieChartActivity.java"));startActivity(i);break;}case R.id.actionToggleValues: {for (IDataSet<?> set : pieChart.getData().getDataSets())set.setDrawValues(!set.isDrawValuesEnabled());pieChart.invalidate();break;}case R.id.actionToggleIcons: {for (IDataSet<?> set : pieChart.getData().getDataSets())set.setDrawIcons(!set.isDrawIconsEnabled());pieChart.invalidate();break;}case R.id.actionToggleHole: {if (pieChart.isDrawHoleEnabled())pieChart.setDrawHoleEnabled(false);elsepieChart.setDrawHoleEnabled(true);pieChart.invalidate();break;}case R.id.actionToggleMinAngles: {if (pieChart.getMinAngleForSlices() == 0f)pieChart.setMinAngleForSlices(36f);elsepieChart.setMinAngleForSlices(0f);pieChart.notifyDataSetChanged();pieChart.invalidate();break;}case R.id.actionToggleCurvedSlices: {boolean toSet = !pieChart.isDrawRoundedSlicesEnabled() || !pieChart.isDrawHoleEnabled();pieChart.setDrawRoundedSlices(toSet);if (toSet && !pieChart.isDrawHoleEnabled()) {pieChart.setDrawHoleEnabled(true);}if (toSet && pieChart.isDrawSlicesUnderHoleEnabled()) {pieChart.setDrawSlicesUnderHole(false);}pieChart.invalidate();break;}case R.id.actionDrawCenter: {if (pieChart.isDrawCenterTextEnabled())pieChart.setDrawCenterText(false);elsepieChart.setDrawCenterText(true);pieChart.invalidate();break;}case R.id.actionToggleXValues: {pieChart.setDrawEntryLabels(!pieChart.isDrawEntryLabelsEnabled());pieChart.invalidate();break;}case R.id.actionTogglePercent:pieChart.setUsePercentValues(!pieChart.isUsePercentValuesEnabled());pieChart.invalidate();break;case R.id.animateX: {pieChart.animateX(1400);break;}case R.id.animateY: {pieChart.animateY(1400);break;}case R.id.animateXY: {pieChart.animateXY(1400, 1400);break;}case R.id.actionToggleSpin: {pieChart.spin(1000, pieChart.getRotationAngle(), pieChart.getRotationAngle() + 360, Easing.EaseInOutCubic);break;}case R.id.actionSave: {if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {saveToGallery();} else {requestStoragePermission(pieChart);}break;}}return true;}@Overridepublic void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {tvX.setText(String.valueOf(seekBarX.getProgress()));tvY.setText(String.valueOf(seekBarY.getProgress()));setData_count_range(seekBarX.getProgress(), seekBarY.getProgress());}@Overrideprotected void saveToGallery() {saveToGallery(pieChart, "PieChartActivity");}private SpannableString generateCenterSpannableText() {SpannableString s = new SpannableString("MPAndroidChart\ndeveloped by Philipp Jahoda");s.setSpan(new RelativeSizeSpan(1.7f), 0, 14, 0);s.setSpan(new StyleSpan(Typeface.NORMAL), 14, s.length() - 15, 0);s.setSpan(new ForegroundColorSpan(Color.GRAY), 14, s.length() - 15, 0);s.setSpan(new RelativeSizeSpan(.8f), 14, s.length() - 15, 0);s.setSpan(new StyleSpan(Typeface.ITALIC), s.length() - 14, s.length(), 0);s.setSpan(new ForegroundColorSpan(ColorTemplate.getHoloBlue()), s.length() - 14, s.length(), 0);return s;}@Overridepublic void onValueSelected(Entry e, Highlight h) {if (e == null)return;Log.i("VAL SELECTED","Value: " + e.getY() + ", index: " + h.getX()+ ", DataSet index: " + h.getDataSetIndex());}@Overridepublic void onNothingSelected() {Log.i("PieChart", "nothing selected");}@Overridepublic void onStartTrackingTouch(SeekBar seekBar) {}@Overridepublic void onStopTrackingTouch(SeekBar seekBar) {}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.viewGithub: {Intent i = new Intent(Intent.ACTION_VIEW);i.setData(Uri.parse("https://github.com/PhilJay/MPAndroidChart/blob/master/MPChartExample/src/com/xxmassdeveloper/mpchartexample/PieChartActivity.java"));startActivity(i);break;}case R.id.actionToggleYValues: {for (IDataSet<?> set : pieChart.getData().getDataSets())set.setDrawValues(!set.isDrawValuesEnabled());pieChart.invalidate();break;}case R.id.actionToggleIcons: {for (IDataSet<?> set : pieChart.getData().getDataSets())set.setDrawIcons(!set.isDrawIconsEnabled());pieChart.invalidate();break;}case R.id.actionToggleHole: {if (pieChart.isDrawHoleEnabled())pieChart.setDrawHoleEnabled(false);elsepieChart.setDrawHoleEnabled(true);pieChart.invalidate();break;}case R.id.actionToggleMinAngles: {if (pieChart.getMinAngleForSlices() == 0f)pieChart.setMinAngleForSlices(36f);elsepieChart.setMinAngleForSlices(0f);pieChart.notifyDataSetChanged();pieChart.invalidate();break;}case R.id.actionToggleCurvedSlices: {boolean toSet = !pieChart.isDrawRoundedSlicesEnabled() || !pieChart.isDrawHoleEnabled();pieChart.setDrawRoundedSlices(toSet);if (toSet && !pieChart.isDrawHoleEnabled()) {pieChart.setDrawHoleEnabled(true);}if (toSet && pieChart.isDrawSlicesUnderHoleEnabled()) {pieChart.setDrawSlicesUnderHole(false);}pieChart.invalidate();break;}case R.id.actionDrawCenter: {if (pieChart.isDrawCenterTextEnabled())pieChart.setDrawCenterText(false);elsepieChart.setDrawCenterText(true);pieChart.invalidate();break;}case R.id.actionToggleXValues: {pieChart.setDrawEntryLabels(!pieChart.isDrawEntryLabelsEnabled());pieChart.invalidate();break;}case R.id.actionTogglePercent:pieChart.setUsePercentValues(!pieChart.isUsePercentValuesEnabled());pieChart.invalidate();break;case R.id.animateX: {pieChart.animateX(1400);break;}case R.id.animateY: {pieChart.animateY(1400);break;}case R.id.animateXY: {pieChart.animateXY(1400, 1400);break;}case R.id.actionToggleSpin: {pieChart.spin(1000, pieChart.getRotationAngle(), pieChart.getRotationAngle() + 360, Easing.EaseInOutCubic);break;}case R.id.actionSave: {if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {saveToGallery();} else {requestStoragePermission(pieChart);}break;}}} }

總結

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