可处理Android上的不规则形状的事件？ [英] Can handle events on irregular shapes on Android?

问题描述

据我所知，现在（这一点），在Android中所有的意见都正方形或长方形的形状。这是罚款几乎所有的，直到你想要的时间 - 我其实想 - 创建非正方形的形状，可以处理事件。

As far as I know for now (which is little), all the Views in Android have square or rectangular shapes. This is fine almost all the time until you want - what I actually want - to create non-square shapes that could handle events.

我的目标是在每120°3段分成了一圈。圆圈的每个部分应该表现得像一个按钮。的问题是，如果我们看的圆的那些三度，并将其放置在严格包含它们方盒，它们相互重叠：不实用知道意味着用户点击这...

My goal is to have a circle divided in 3 sections of 120° each. Each section of the circle should behave like a button. The problem is that if we look at those 3rds of a circle and place them in a square box that strictly contains them, they are overlapping each other: not practical to know which the user meant to click...

我试过在我拔出部分的自定义视图，但事件被触发视图的所有表面。

I tried with a custom view in which I drew my sections but the events are triggering on all the surface of the view.

任何建议或方向是非常欢迎的。

Any suggestion or direction is very welcome.

THX，保

推荐答案

首先谢谢你很多关于您的所有建议，这让我要达到的目标。

First thank you a lot for all your suggestions which helped me to reach the goal.

由于没有办法触发事件的形状，其上包含形状视图中使用onTouch（）是要走的路。

Since there is no way to trigger events on shapes, using onTouch() on the view which contains the shapes is the way to go.

之后，你需要运行它。

首先，自定义视图Zones.java：

First, the custom view Zones.java:

package com.vector;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

public class Zones extends View {
    RectF rectf = new RectF(0, 0, 300, 300);
    Paint paint = new Paint();
    Canvas canvas = null;
    Integer zone = 0;

    // important: do not forget to add AttributeSet, it is necessary to have this
    // view called from an xml view file
    public Zones(Context context, AttributeSet attributeset) {
        super(context, attributeset);
        this.setBackgroundColor(0xFF207CA1);
    }

    @Override
    protected void onDraw(Canvas canvas) {

        // set layout of the view
        layout(0, 0, 300, 300);

        // expose canvas at view level
        this.canvas = canvas;

        // check for zone 1 to 3
        if(zone >= 1 && zone <= 3)
        {
            drawTouchZones(zone);
        }
    }

    protected void drawTouchZones(Integer zone)
    {
        paint.setStyle(Paint.Style.FILL);
        paint.setAntiAlias(true);
        paint.setStrokeWidth(2);
        paint.setColor(Color.WHITE);
        paint.setAlpha(75);

        Path path = new Path();

        if(zone == 1) {
            path.moveTo(150,150);
            path.lineTo(150,0);
            path.arcTo(rectf, 270, 120);
            path.close();
        } else if(zone == 2) {
            path.moveTo(150,150);
            path.arcTo(rectf, 30, 120);
            path.lineTo(150,150);
            path.close();
        } else if(zone == 3) {
            path.moveTo(150,0);
            path.lineTo(150,150);
            path.arcTo(rectf, 150, 120);
            path.close();
        }

        canvas.drawPath(path, paint);       
    }
}

二，主要活动，Design.java：

Second, the main activity, Design.java:

package com.vector;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;

public class Design extends Activity {
    /** Called when the activity is first created. */
    private Zones v;
    protected Integer zone = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        try {
            // get our custom view
            setContentView(R.layout.main);
            v = (Zones) findViewById(R.id.zone);

            // add onClick Listener
            v.setOnClickListener(new View.OnClickListener() {
                public void onClick(View view) {
                    Log.i("zone clicked", "" + zone);

                    // tell to our view which zone has been clicked
                    v.zone = zone;

                    // invalidate to call onDraw method of the custom view and draw the zone
                    v.invalidate();
                }
            });

            v.setOnTouchListener(new View.OnTouchListener() {

                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    zone = getZone(event);
                    return false;
                }
            });
        }
        catch(Exception e)
        {
            Log.e("e", e.getMessage());
        }
    }

    // detect clicked zone through MotionEvent
    public int getZone(MotionEvent e)
    {
        Float x = e.getX();
        Float y = e.getY();

        // 0:00 to 4:00
        if((x > 150 && x < 300 && y < 150) ||
           (x > 150 && x < 300 && y > 150 && (x - 150) / (y - 150) > 1.5))
        {
            return 1;
        }
        // 4:00 to 8:00
        else if((x >= 150 && x < 300 & y > 150 && (x - 150) / (y - 150) < 1.5) ||
                (x > 0 && x < 150 && y > 150 && (150 - x) / (y - 150) < 1.5))
        {

            return 2;
        }
        // 8:00 to 0:00
        else
        {
            return 3;
        }       
    }
}

...和主XML视图（其中嵌入了我们自定义的类视图）的main.xml

... and the main xml view (which embeds our custom class view) main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <com.vector.Zones android:id="@+id/zone" android:layout_height="wrap_content" android:layout_width="wrap_content">
    </com.vector.Zones>
</LinearLayout>

任何意见AP preciated！
保罗：）

Any comments appreciated! Paul :)

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