本文实例为大家分享了Android实现折线图小工具的具体代码，供大家参考，具体内容如下
1.LineChart类
public class LineChart extends View {
private Paint XPaint;
private Paint YPaint;
private Paint pointPaint;
private Paint circlePaint;
private Paint shapePaint;
private Paint effectPaint, effectPaint1;
private float yandianx, yuandiany, height, wigth;
private Context context;
private String ysplit[];
private String unit;
private float max;
private int textSize = 7;
private int margin = 20;
private float gao;
private boolean start = false;
private Map<String, Float> mapx;
public LineChart(Context context) {
super(context);
this.context = context;
}
public LineChart(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
}
public LineChart(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context = context;
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public LineChart(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
this.context = context;
}
private void initView() {
XPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
XPaint.setAntiAlias(true);
XPaint.setColor(Color.parseColor("#1e90ff"));
XPaint.setStrokeWidth(dp2px(1));
YPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
YPaint.setAntiAlias(true);
YPaint.setColor(Color.BLACK);
YPaint.setStrokeWidth(dp2px(2));
pointPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
pointPaint.setAntiAlias(true);
pointPaint.setColor(Color.BLACK);
pointPaint.setStyle(Paint.Style.STROKE);
pointPaint.setStrokeWidth(dp2px(1));
circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
circlePaint.setAntiAlias(true);
circlePaint.setColor(Color.WHITE);
circlePaint.setStyle(Paint.Style.FILL);
circlePaint.setStrokeWidth(1);
shapePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
shapePaint.setAntiAlias(true);
shapePaint.setColor(Color.TRANSPARENT);
shapePaint.setStyle(Paint.Style.FILL);
shapePaint.setStrokeWidth(1);
effectPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
effectPaint.setAntiAlias(true);
effectPaint.setColor(Color.BLACK);
effectPaint.setStyle(Paint.Style.FILL);
effectPaint.setStrokeWidth(1);
effectPaint.setTextSize(sp2px(textSize));
effectPaint1 = new Paint(Paint.ANTI_ALIAS_FLAG);
effectPaint1.setAntiAlias(true);
effectPaint1.setColor(Color.BLACK);
effectPaint1.setStyle(Paint.Style.FILL);
effectPaint1.setStrokeWidth(1);
effectPaint1.setTextSize(sp2px(9));
}
@Override
protected void onDraw(Canvas canvas) {
if (start) {
yandianx = dp2px(margin);
yuandiany = getMeasuredHeight() - dp2px(margin);
wigth = getMeasuredWidth() - dp2px(margin * 2);
height = getMeasuredHeight() - dp2px(margin * 2);
float point[] = new float[]{yandianx, yuandiany, yandianx, yandianx, yandianx - dp2px(3), yandianx + dp2px(textSize / 2)};
canvas.drawLines(point, 0, 4, YPaint);
canvas.drawLines(point, 2, 4, YPaint);
canvas.drawLine(yandianx, yandianx, yandianx + dp2px(3), yandianx + dp2px(textSize / 2), YPaint);
canvas.drawLine(yandianx, yuandiany, yandianx + wigth, yuandiany, YPaint);
canvas.drawLine(yandianx + wigth, yuandiany, yandianx + wigth - dp2px(textSize / 2), yuandiany - dp2px(3), YPaint);
canvas.drawLine(yandianx + wigth, yuandiany, yandianx + wigth - dp2px(textSize / 2), yuandiany + dp2px(3), YPaint);
canvas.drawText("0", yandianx - sp2px(textSize) - dp2px(2), yuandiany + sp2px(textSize) + dp2px(2), effectPaint);
if (null != unit) {
canvas.drawText(unit, yandianx - sp2px(textSize) * unit.length() / 2, yuandiany - height - dp2px(3), effectPaint);
}
if (null != ysplit && ysplit.length > 0) {
gao = height / (ysplit.length + 1);
for (int i = 0; i < ysplit.length; i++) {
float a = Float.parseFloat(ysplit[i]);
if (max < a) {
max = a;
}
canvas.drawLine(yandianx, yuandiany - (i + 1) * gao, yandianx + dp2px(3), yuandiany - (i + 1) * gao, YPaint);
canvas.drawText(ysplit[i], yandianx - (sp2px(textSize) * (ysplit[i].length())), yuandiany - (i + 1) * gao + sp2px(textSize / 2), effectPaint);
}
}
if (mapx.size() > 0) {
float kuan = wigth / (mapx.size() + 1);
Object o[] = mapx.keySet().toArray();
for (int i = 0; i < o.length; i++) {
String s = o[i].toString();
float x = yandianx + (i + 1) * kuan;
float y = yuandiany - (height - gao) / max * mapx.get(o[i]);
canvas.drawLine(x, yuandiany, x, yuandiany - dp2px(3), YPaint);
canvas.drawText(s, x - (sp2px(textSize) * (s.length() / 2)), yuandiany + sp2px(textSize) + dp2px(3), effectPaint);
if (i > 0) {
canvas.drawLine(yandianx + i * kuan, yuandiany - (height - gao) / max * mapx.get(o[i - 1]), x, y, XPaint);
}
int size = dp2px(3);
for (int i1 = 0; i1 < (x - yandianx) / size; i1++) {
if (i1 % 2 == 0)
canvas.drawLine(i1 * size + yandianx, y, (i1 + 1) * size + yandianx, y, shapePaint);
}
for (int i1 = 0; i1 < (yuandiany - y) / size; i1++) {
if (i1 % 2 == 0)
canvas.drawLine(x, yuandiany - i1 * size, x, yuandiany - (i1 + 1) * size, shapePaint);
}
String text = mapx.get(o[i]).toString();
canvas.drawText(text, x - text.length() * sp2px(textSize / 4), y - dp2px(3), effectPaint1);
}
for (int i = 0; i < o.length; i++) {
float x = yandianx + (i + 1) * kuan;
float y = yuandiany - (height - gao) / max * mapx.get(o[i]);
canvas.drawCircle(x, y, dp2px(3), circlePaint);
canvas.drawCircle(x, y, dp2px(3), pointPaint);
}
}
}
}
public void startDraw(Map<String, Float> mapx, String[] ysplit, String unit, int margin, int textSize) {
start = true;
this.mapx = mapx;
this.ysplit = ysplit;
this.unit = unit;
this.textSize = textSize;
this.margin = margin;
initView();
invalidate();
}
private int sp2px(float spValue) {
float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
return (int) (spValue * fontScale + 0.5f);
}
private int dp2px(float dpValue) {
float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
}2.Fragment代码
1.布局文件
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.hnucm18jr.myapplication.LineChart
android:id="@+id/lineChart"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>2.逻辑代码
public class Zt_fragment extends Fragment {
LineChart mLineChart;
Calendar calendar = Calendar.getInstance();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_zt_fragment, container, false);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mLineChart=getActivity(). findViewById(R.id.lineChart);
//月
int month = calendar.get(Calendar.MONTH)+1;
//日
int day = calendar.get(Calendar.DAY_OF_MONTH);
Log.i("TIME","-------"+month+day);
Map<String ,Float> map=new LinkedHashMap<>() ;//一定要用有序的Map
int min=6;
int max=18;
Random random = new Random();
float num1 = random.nextInt(max)%(max-min+1) + min;
float num2 = random.nextInt(max)%(max-min+1) + min;
float num3 = random.nextInt(max)%(max-min+1) + min;
float num4 = random.nextInt(max)%(max-min+1) + min;
float num5 = random.nextInt(max)%(max-min+1) + min;
float num6 = random.nextInt(max)%(max-min+1) + min;
float num7 = random.nextInt(max)%(max-min+1) + min;
if ((day-6)<=0){
String s1= (month-1) + "." + (30+day-6);
map.put(s1,num1);
}else {
String s1= month + "." + (day-6);
map.put(s1,num1);
}
if ((day-5)<=0){
String s2= (month-1) + "." + (30+day-5);
map.put(s2,num2);
}else {
String s2= month + "." + (day-5);
map.put(s2,num2);
}
if ((day-4)<=0){
String s3= (month-1) + "." + (30+day-4);
map.put(s3,num3);
}else {
String s3= month + "." + (day-4);
map.put(s3,num3);
}
if ((day-3)<=0){
String s4= (month-1) + "." + (30+day-3);
map.put(s4,num4);
}else {
String s4= month + "." + (day-3);
map.put(s4,num4);
}
if ((day-2)<=0){
String s5= (month-1) + "." + (30+day-2);
map.put(s5,num5);
}else {
String s5= month + "." + (day-2);
map.put(s5,num5);
}
if ((day-1)<=0){
String s6= (month-1) + "." + (30+day-1);
map.put(s6,num6);
}else {
String s6= month + "." + (day-1);
map.put(s6,num6);
}
String s7= month + "." + day;
map.put(s7,num7);
String[] a=new String[]{"06","12","18","24"};
mLineChart.startDraw(map,a,"小时",40,10);//map为横坐标数据和点数据，a为纵坐标刻度（为数字类型的字符串，m/s为纵坐标单位,40为坐标轴距离边界的位置dp，14是坐标轴字体大小）
}
}3.Activity代码
1.布局文件
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/frameLayout"
android:layout_width="0dp"
android:layout_height="300dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>2.逻辑代码
public class MainActivity extends AppCompatActivity {
Zt_fragment mZt_fragment=new Zt_fragment();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportFragmentManager().beginTransaction().replace(R.id.frameLayout,mZt_fragment).commit();
}
}运行
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
