Android:用线连接按钮 [英] Android: Connect buttons with lines

问题描述

我正在编写一个与二叉树/图形非常相似的Android应用程序，有多个动态创建的按钮，但我不知道如何创建连接这些按钮的线.

I´m writing an Android Aplication that is very similar to a binary tree/graph, there are several buttons created dinamically but I can´t figure out how to create lines connecting the buttons.

以下是显示我需要做什么的图像:

Here´s an image showing what I need to do:

这是我的XML文件:

    <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/vscroll"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#000000" >

    <HorizontalScrollView
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/hscroll"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#888888" >

        <RelativeLayout
            xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:tools="http://schemas.android.com/tools"
            android:id="@+id/relativescroll"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:background="#FFFFFF" >

            <!-- Buttons and lines connecting them -->

        </RelativeLayout>
    </HorizontalScrollView>

</ScrollView>

这是活动类的示例:

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RelativeLayout mainLayout = (RelativeLayout) findViewById(R.id.relativescroll);
        RelativeLayout.LayoutParams newParams;

        // Botão 1
        Button btn1 = new Button(this); 
        btn1.setId(1);
        btn1.setText("Botão 1");
        newParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 
                RelativeLayout.LayoutParams.WRAP_CONTENT
                );
        newParams.setMargins(0, 0, 20, 50);
        newParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
        btn1.setLayoutParams(newParams);
        mainLayout.addView(btn1);

        // Botão 2
        Button btn2 = new Button(this);
        btn2.setId(2);
        btn2.setText("Botão 2");
        newParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 
                RelativeLayout.LayoutParams.WRAP_CONTENT
                );
        newParams.setMargins(0, 0, 20, 50);
        newParams.addRule(RelativeLayout.BELOW, 1);
        newParams.addRule(RelativeLayout.ALIGN_PARENT_LEFT);
        btn2.setLayoutParams(newParams);
        mainLayout.addView(btn2); 

        // Botão 3
        Button btn3 = new Button(this);
        btn3.setId(3);
        btn3.setText("Botão 3");
        newParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 
                RelativeLayout.LayoutParams.WRAP_CONTENT
                );
        newParams.setMargins(0, 0, 20, 50);
        newParams.addRule(RelativeLayout.BELOW, 1);
        newParams.addRule(RelativeLayout.RIGHT_OF, 2);
        btn3.setLayoutParams(newParams);
        mainLayout.addView(btn3);

        // Botão 4
        Button btn4 = new Button(this);
        btn4.setId(4);
        btn4.setText("Botão 4");
        newParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 
                RelativeLayout.LayoutParams.WRAP_CONTENT
                );
        newParams.setMargins(0, 0, 20, 50);
        newParams.addRule(RelativeLayout.BELOW, 1);
        newParams.addRule(RelativeLayout.RIGHT_OF, 3);
        btn4.setLayoutParams(newParams);
        mainLayout.addView(btn4);

        // Botão 4
        Button btn5 = new Button(this);
        btn5.setId(5);
        btn5.setText("Botão 5");
        newParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 
                RelativeLayout.LayoutParams.WRAP_CONTENT
                );
        newParams.setMargins(0, 0, 20, 50);
        newParams.addRule(RelativeLayout.BELOW, 1);
        newParams.addRule(RelativeLayout.RIGHT_OF, 4);
        btn5.setLayoutParams(newParams);
        mainLayout.addView(btn5);   

        // DRAW LINK        
        NodeLink link = new NodeLink(this);
        newParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, 
                RelativeLayout.LayoutParams.WRAP_CONTENT
                );
        newParams.addRule(RelativeLayout.BELOW, 1);
        newParams.addRule(RelativeLayout.ABOVE, 2);
        newParams.addRule(RelativeLayout.RIGHT_OF, 1);
        newParams.addRule(RelativeLayout.LEFT_OF, 2);
        mainLayout.addView(link);

    }

}

请问，关于如何执行此操作的任何想法?

Please, any ideas on how can I do that?

推荐答案

您可能想说一下NodeLink在做什么-自定义视图类?

You might want to say what NodeLink is doing - custom view class?

无论如何，我建议您获取按钮上锚点"的坐标(从图表中获取顶部中心点)，然后创建链接相关按钮锚点的路径.将这些路径绘制/绘制到图片中，将其另存为 PictureDrawable ，然后您可以将该Drawable设置为按钮的父级背景( RelativeLayout/mainLayout).

Any case, I'd suggest getting the coordinates of "anchors" on your buttons (top-center points, from your diagram), then creating Paths that link associated buttons' anchors. Draw/paint these Paths into a Picture, save it as a PictureDrawable, and then you can set that Drawable as the background of your buttons' parent (the RelativeLayout/mainLayout).

这篇关于Android:用线连接按钮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！