android中饼图上的点击事件 [英] click event on pie chart in android
本文介绍了android中饼图上的点击事件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我曾经用画布绘制饼图..饼图中大约有 10 条弧线.我想对每条弧线执行点击事件.有没有办法做到这一点?或者其他方式?
I have used to draw pie chart using canvas.. There are approximately 10 arcs in pie chart..i want to perform click event on each arc. Is there any way to do this? or any other way?
这是我的饼图视图..
MyView.java
MyView.java
package android.piechart;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
public class MyView extends View {
private Paint p;
private int startX;
private int startY;
private int radius;
private ArrayList<Integer> colors;
private ArrayList<Integer> values;
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
p = new Paint();
p.setColor(Color.BLUE);
p.setAntiAlias(true);
colors = new ArrayList<Integer>();
values = new ArrayList<Integer>();
startX = 320 / 4;
startY = 480 / 8;
radius = 320 / 2;
colors.add(Color.GREEN);
colors.add(Color.CYAN);
colors.add(Color.MAGENTA);
colors.add(Color.BLUE);
colors.add(Color.RED);
values.add(0);
values.add(1);
values.add(3);
values.add(0);
values.add(2);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Log.e("", "onDraw() is called...");
float offset = 0;
float sum = 0;
for (int a = 0; a < values.size(); a++) {
sum += values.get(a);
}
float angle = (float) (360 / sum);
Log.e("angle", "" + angle);
RectF rectF = new RectF();
rectF.set(getStartX(), getStartY(), getStartX() + getRadius(),
getStartY() + getRadius());
for (int i = 0; i < values.size(); i++) {
p.setColor(colors.get(i));
if (i == 0) {
canvas.drawArc(rectF, 0, values.get(i) * angle, true, p);
} else {
canvas.drawArc(rectF, offset, values.get(i) * angle, true, p);
}
offset += (values.get(i) * angle);
}
canvas.save();
}
public int getStartX() {
return startX;
}
public void setStartX(int startX) {
this.startX = startX;
}
public int getStartY() {
return startY;
}
public void setStartY(int startY) {
this.startY = startY;
}
public int getRadius() {
return radius;
}
public void setRadius(int radius) {
this.radius = radius;
}
public ArrayList<Integer> getColors() {
return colors;
}
public void setColors(ArrayList<Integer> colors) {
this.colors = colors;
}
public ArrayList<Integer> getValues() {
return values;
}
public void setValues(ArrayList<Integer> values) {
this.values = values;
}
}
提前致谢..
推荐答案
我自己解决了我的问题...
I solved my question myself...
MyView.java
MyView.java
public class MyView extends View {
private Paint p;
private int startX;
private int startY;
private int radius;
private ArrayList<Integer> colors;
private ArrayList<Float> values;
Bitmap bitmap;
Context mContext;
public MyView(Context context, AttributeSet attrs) {
super(context, attrs);
mContext = context;
p = new Paint();
p.setAntiAlias(true);
colors = new ArrayList<Integer>();
values = new ArrayList<Float>();
startX = 320 / 4;
startY = 480 / 8;
radius = 320 / 2;
colors.add(Color.GREEN);
colors.add(Color.CYAN);
colors.add(Color.MAGENTA);
colors.add(Color.BLUE);
colors.add(Color.RED);
values.add(5f);
values.add(1f);
values.add(3f);
values.add(5f);
values.add(2f);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
bitmap = Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(),
Bitmap.Config.ARGB_8888);
Canvas c = new Canvas(bitmap);
Log.e("", "onDraw() is called...");
float offset = 0;
float sum = 0;
for (int a = 0; a < values.size(); a++) {
sum += values.get(a);
}
float angle = (float) (360 / sum);
Log.e("angle", "" + angle);
RectF rectF = new RectF();
rectF.set(getStartX(), getStartY(), getStartX() + getRadius(),
getStartY() + getRadius());
for (int i = 0; i < values.size(); i++) {
p.setColor(colors.get(i));
if (i == 0) {
canvas.drawArc(rectF, 0, values.get(i) * angle, true, p);
c.drawArc(rectF, 0, values.get(i) * angle, true, p);
} else {
canvas.drawArc(rectF, offset, values.get(i) * angle, true, p);
c.drawArc(rectF, offset, values.get(i) * angle, true, p);
}
offset += (values.get(i) * angle);
}
canvas.save();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int color = bitmap.getPixel((int) event.getX(), (int) event.getY());
Log.e("", "" + color);
if (colors.contains(color)) {
Log.e("", "is matching");
if (color == Color.RED) {
Toast.makeText(mContext, "Is Red", Toast.LENGTH_SHORT).show();
}
if (color == Color.CYAN) {
Toast.makeText(mContext, "Is Cyan", Toast.LENGTH_SHORT).show();
}
if (color == Color.MAGENTA) {
Toast.makeText(mContext, "Is MAGENTA", Toast.LENGTH_SHORT)
.show();
}
if (color == Color.BLUE) {
Toast.makeText(mContext, "Is BLUE", Toast.LENGTH_SHORT).show();
}
if (color == Color.GREEN) {
Toast.makeText(mContext, "Is GREEN", Toast.LENGTH_SHORT).show();
}
}
return super.onTouchEvent(event);
}
public int getStartX() {
return startX;
}
public void setStartX(int startX) {
this.startX = startX;
}
public int getStartY() {
return startY;
}
public void setStartY(int startY) {
this.startY = startY;
}
public int getRadius() {
return radius;
}
public void setRadius(int radius) {
this.radius = radius;
}
public ArrayList<Integer> getColors() {
return colors;
}
public void setColors(ArrayList<Integer> colors) {
this.colors = colors;
}
public ArrayList<Float> getValues() {
return values;
}
public void setValues(ArrayList<Float> values) {
this.values = values;
}
}
我希望它对其他人有用...
I hope it's useful to others...
这篇关于android中饼图上的点击事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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