六角形按钮,六角形触摸区域

Question

我需要创建相同的按钮,如下图所示.Button必须在里面的文字.

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当我在进行XML布局时遇到了Button触摸区问题.每个下一个按钮都覆盖前一个带有矩形Button区域的按钮.

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是否像我一样在XML标记中放置六边形,以实现像图片中的六边形？请帮助我解决触摸区域的问题,如果可能的话告诉我如何正确创建布局,因为我不确定,因为我做的是正确的.

这是我的测试布局的一部分:

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:layout_marginTop="?attr/actionBarSize">


            <Button
                android:id="@+id/button1"
                android:layout_width="130dp"
                android:layout_height="134dp"
                android:background="@drawable/hexagon_shape_img"
                android:text="Home page"
                android:textSize="@dimen/small_text" />

            <Button
                android:id="@+id/button2"
                android:layout_width="130dp"
                android:layout_height="134dp"
                android:layout_marginLeft="65dp"
                android:layout_marginTop="-20dp"
                android:background="@drawable/hexagon_shape_img"
                android:text="Tavern"
                android:textSize="@dimen/small_text" />

        </LinearLayout>

Answer 1

好吧，结果比我想象的要复杂。基本问题是最高 Z 顺序的按钮始终会获取触摸事件，但不会将其传递给较低 Z 顺序的按钮，即使它不处理该事件也是如此。要让两个按钮都能看到事件，需要解决方法。这是基本方法：

1：在当前保存十六进制按钮的片段/活动中创建一个容器

2：创建一个包含按钮和所有按钮之上的另一个按钮（alpha=0）的片段

3：添加一个 getOverlay():View 方法，返回 alpha=0 按钮

4：在fragment中实现一个hitTest():Button方法

5：在主Activity/Fragment中，设置监听器来处理覆盖按钮的触摸事件

我制作（并测试）了一个应用程序来演示这个概念。我将把 hitTest 留给你，因为它相当乏味

活动_main.xml：

<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent"
android:layout_height="match_parent" 
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" 
tools:context=".MainActivity">

    <FrameLayout android:id="@+id/main_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

片段_按钮.xml：

<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.me.testapplication.Buttons">

    <Button android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/lorem"/>
    <Button android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/lorem_ipsum"
        android:alpha="0.4"/>
    <Button android:id="@+id/overlay"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:alpha="0"/>

</FrameLayout>

MainActivity.java：

public class MainActivity extends ActionBarActivity {
    public static final String DEBUG_TAG = "TEST";

    private Buttons mButtons;
    private GestureDetector mGestureDetector;

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

        mButtons = Buttons.newInstance();
        getFragmentManager().beginTransaction()
                .replace(R.id.main_container, mButtons)
                .commit();

        mGestureDetector = new GestureDetector(this, mGestureListener);
    }

    @Override
    protected void onStart() {
        super.onStart();

        View overlay = mButtons.getOverlay();
        if (overlay != null) {
            overlay.setOnTouchListener(mTouchListener);
        }
    }
    ...
    private View.OnTouchListener mTouchListener = new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
             return mGestureDetector.onTouchEvent(event);
        }
    };

    private GestureDetector.OnGestureListener mGestureListener
            =new GestureDetector.OnGestureListener()
    {
            @Override
            public boolean onDown(MotionEvent e) {
            String buttonHit = mButtons.hitTest(e);
            Log.i(DEBUG_TAG, buttonHit);
            return true;
        }
        ...
    };
}

按钮.java：

public class Buttons extends Fragment {

    Button mButton1, mButton2;
    View mOverlay;

    public static Buttons newInstance() {
        return new Buttons();
    }

    public Buttons() {}

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

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View root = inflater.inflate(R.layout.fragment_buttons, container, false);
        mButton1 = (Button) root.findViewById(R.id.button1);
        mButton2 = (Button) root.findViewById(R.id.button2);
        mOverlay = root.findViewById(R.id.overlay);
        return root;
    }

    @Nullable
    public View getOverlay() {
        return mOverlay;
    }

    public String hitTest(MotionEvent event) {
        float x = event.getX();
        float y = event.getY();

        if (x > mButton1.getLeft() && mButton1.getRight() > x &&
                y > mButton1.getTop() && mButton1.getBottom() > y)
        {
            return "Button 1";
        } else if (x > mButton2.getLeft() && mButton2.getRight() > x &&
                y > mButton2.getTop() && mButton2.getBottom() > y)
        {
            return "Button 2";
        } else {
            return "None";
        }
    }
}

祝你好运。

ETA：命中测试示例

/**
 * UNTESTED
 * I'm going to assume square buttons (equilateral hexagons)
 * this just calculates if the distance from the center of the button is less than its width. It may be good enough for government work.
 */
public View hitTest(MotionEvent e) {
    for (Button hex : SomeIterableThingHoldingYourButtons) { //ArrayList<Button> maybe
        float x = e.getX();
        float y = e.getY();

        if (isInHex(hex, x, y)) return hex;
     }
     return null;
}

private boolean isInHex(Button hex, float x, float y) {
    float radius = hex.getRight() - hex.getLeft() / 2;
    float centerX = hex.getLeft() + radius;
    float centerY = hex.getTop() + radius;

    float dist = FloatMath.sqrt(...) //euclidean distance

    return dist < radius;
}