Android'de grafikler ve grafikler çizmenin bir yolu var mı?

Question

Yeni Java'm ve Android'de yeni. Tarihe dayalı bir kullanıcıdan verileri grafikleyen bir Android uygulaması yazmaya çalışıyorum. Java’yı JavaScript’i kullanmadan yapmanın bir yolu var mı (bilmiyorum)? kodunun altına

Answer 1

deneyin

GraphActivity sınıf

package com.graph; 
import android.app.Activity; 
import android.os.Bundle; 

public class GraphActivity extends Activity { 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    float[] values = new float[] { 2.0f,1.5f, 2.5f, 1.0f , 3.0f }; 
    String[] verlabels = new String[] { "great", "ok", "bad" }; 
    String[] horlabels = new String[] { "today", "tomorrow", "next week", "next month" }; 
    GraphView graphView = new GraphView(this, values, "GraphViewDemo",horlabels, verlabels, GraphView.LINE); 
    setContentView(graphView); 
} 
} 

GraphView sınıf

package com.graph; 

import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.Paint.Align; 
import android.view.View; 


public class GraphView extends View { 

public static boolean BAR = true; 
public static boolean LINE = false; 

private Paint paint; 
private float[] values; 
private String[] horlabels; 
private String[] verlabels; 
private String title; 
private boolean type; 

public GraphView(Context context, float[] values, String title, String[] horlabels, String[] verlabels, boolean type) { 
    super(context); 
    if (values == null) 
     values = new float[0]; 
    else 
     this.values = values; 
    if (title == null) 
     title = ""; 
    else 
     this.title = title; 
    if (horlabels == null) 
     this.horlabels = new String[0]; 
    else 
     this.horlabels = horlabels; 
    if (verlabels == null) 
     this.verlabels = new String[0]; 
    else 
     this.verlabels = verlabels; 
    this.type = type; 
    paint = new Paint(); 
} 

@Override 
protected void onDraw(Canvas canvas) { 
    float border = 20; 
    float horstart = border * 2; 
    float height = getHeight(); 
    float width = getWidth() - 1; 
    float max = getMax(); 
    float min = getMin(); 
    float diff = max - min; 
    float graphheight = height - (2 * border); 
    float graphwidth = width - (2 * border); 

    paint.setTextAlign(Align.LEFT); 
    int vers = verlabels.length - 1; 
    for (int i = 0; i < verlabels.length; i++) { 
     paint.setColor(Color.DKGRAY); 
     float y = ((graphheight/vers) * i) + border; 
     canvas.drawLine(horstart, y, width, y, paint); 
     paint.setColor(Color.WHITE); 
     canvas.drawText(verlabels[i], 0, y, paint); 
    } 
    int hors = horlabels.length - 1; 
    for (int i = 0; i < horlabels.length; i++) { 
     paint.setColor(Color.DKGRAY); 
     float x = ((graphwidth/hors) * i) + horstart; 
     canvas.drawLine(x, height - border, x, border, paint); 
     paint.setTextAlign(Align.CENTER); 
     if (i==horlabels.length-1) 
      paint.setTextAlign(Align.RIGHT); 
     if (i==0) 
      paint.setTextAlign(Align.LEFT); 
     paint.setColor(Color.WHITE); 
     canvas.drawText(horlabels[i], x, height - 4, paint); 
    } 

    paint.setTextAlign(Align.CENTER); 
    canvas.drawText(title, (graphwidth/2) + horstart, border - 4, paint); 

    if (max != min) { 
     paint.setColor(Color.LTGRAY); 
     if (type == BAR) { 
      float datalength = values.length; 
      float colwidth = (width - (2 * border))/datalength; 
      for (int i = 0; i < values.length; i++) { 
       float val = values[i] - min; 
       float rat = val/diff; 
       float h = graphheight * rat; 
       canvas.drawRect((i * colwidth) + horstart, (border - h) + graphheight, ((i * colwidth) + horstart) + (colwidth - 1), height - (border - 1), paint); 
      } 
     } else { 
      float datalength = values.length; 
      float colwidth = (width - (2 * border))/datalength; 
      float halfcol = colwidth/2; 
      float lasth = 0; 
      for (int i = 0; i < values.length; i++) { 
       float val = values[i] - min; 
       float rat = val/diff; 
       float h = graphheight * rat; 
       if (i > 0) 
        canvas.drawLine(((i - 1) * colwidth) + (horstart + 1) + halfcol, (border - lasth) + graphheight, (i * colwidth) + (horstart + 1) + halfcol, (border - h) + graphheight, paint); 
       lasth = h; 
      } 
     } 
    } 
} 

private float getMax() { 
    float largest = Integer.MIN_VALUE; 
    for (int i = 0; i < values.length; i++) 
     if (values[i] > largest) 
      largest = values[i]; 
    return largest; 
} 

private float getMin() { 
    float smallest = Integer.MAX_VALUE; 
    for (int i = 0; i < values.length; i++) 
     if (values[i] < smallest) 
      smallest = values[i]; 
    return smallest; 
} 

}