如何使用多个 TouchDelegate [英] How To Use Multiple TouchDelegate

问题描述

我有两个 ImageButton，每个都在一个相对布局中，而这两个相对布局在另一个相对布局中，我想为每个图像按钮设置 TouchDelegate.如果通常我将 TouchDelegate 添加到每个 ImageButton 并且它是父 RelativeLayout 那么只有一个 ImageButton 可以正常工作，另一个不会扩展它的点击区域.所以请帮助我如何在两个 ImageButtons 中使用 TouchDelegate.如果不可能，那么什么是扩展视图单击区域的有效方法?提前致谢........

i have two ImageButtons, each inside a RelativeLayout and these two RelativeLayouts are in another RelativeLayout, i want to set TouchDelegate for each ImageButton. If normally i add TouchDelegate to each ImageButton and it's parent RelativeLayout then just one ImageButton works properly, Another one doesn't extend it's clicking area. So PLease help me on how to use TouchDelegate in both ImageButtons. If it's not possible then what can be a effective way to extend the clicking area of a view? Thanks in advance ........

这是我的xml代码:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/FrameContainer"
android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout android:layout_alignParentLeft="true"
    android:id="@+id/relativeLayout3" android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <RelativeLayout android:layout_alignParentLeft="true"
        android:id="@+id/relativeLayout1" android:layout_width="113dip"
        android:layout_height="25dip">
        <ImageButton android:id="@+id/tutorial1"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:background="@null" android:src="@drawable/tutorial" />
    </RelativeLayout>
    <RelativeLayout android:layout_alignParentLeft="true"
        android:id="@+id/relativeLayout2" android:layout_width="113dip"
        android:layout_height="25dip" android:layout_marginLeft="100dip">
        <ImageButton android:id="@+id/tutorial2"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:background="@null" android:src="@drawable/tutorial"
            android:layout_marginLeft="50dip" />
    </RelativeLayout>
</RelativeLayout>

我的活动类:

import android.app.Activity;
import android.graphics.Rect;
import android.os.Bundle;
import android.view.TouchDelegate;
import android.view.View;
import android.widget.ImageButton;
import android.widget.Toast;

public class TestTouchDelegate extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    View mParent1 = findViewById(R.id.relativeLayout1);
    mParent1.post(new Runnable() {
        @Override
        public void run() {
            Rect bounds1 = new Rect();
            ImageButton mTutorialButton1 = (ImageButton) findViewById(R.id.tutorial1);
            mTutorialButton1.setEnabled(true);
            mTutorialButton1.setOnClickListener(new View.OnClickListener() {
                public void onClick(View view) {
                    Toast.makeText(TestTouchDelegate.this, "Test TouchDelegate 1", Toast.LENGTH_SHORT).show();
                }
            });

            mTutorialButton1.getHitRect(bounds1);
            bounds1.right += 50;
            TouchDelegate touchDelegate1 = new TouchDelegate(bounds1, mTutorialButton1);

            if (View.class.isInstance(mTutorialButton1.getParent())) {
                ((View) mTutorialButton1.getParent()).setTouchDelegate(touchDelegate1);
            }
        }
    });

    //View mParent = findViewById(R.id.FrameContainer);
    View mParent2 = findViewById(R.id.relativeLayout2);
    mParent2.post(new Runnable() {
        @Override
        public void run() {
            Rect bounds2 = new Rect();
            ImageButton mTutorialButton2 = (ImageButton) findViewById(R.id.tutorial2);
            mTutorialButton2.setEnabled(true);
            mTutorialButton2.setOnClickListener(new View.OnClickListener() {
                public void onClick(View view) {
                    Toast.makeText(TestTouchDelegate.this, "Test TouchDelegate 2", Toast.LENGTH_SHORT).show();
                }
            });

            mTutorialButton2.getHitRect(bounds2);
            bounds2.left += 50;
            TouchDelegate touchDelegate2 = new TouchDelegate(bounds2, mTutorialButton2);

            if (View.class.isInstance(mTutorialButton2.getParent())) {
                ((View) mTutorialButton2.getParent()).setTouchDelegate(touchDelegate2);
            }
        }
    });

}

}

推荐答案

您可以使用复合模式将多个 TouchDelegate 添加到 View.步骤:

You can use composite pattern to be able to add more than one TouchDelegate to the View. Steps:

1. 创建 TouchDelegateComposite(无论您将作为参数，它只是用来获取上下文)
2. 创建必要的TouchDelegates并将它们添加到组合中

3. 添加复合视图，因为他们推荐此处 (通过 view.post(new Runnable))

1. Create TouchDelegateComposite (no matter what view you'll pass as an argument, it's used just to get the Context)
2. Create necessary TouchDelegates and add them to composite

3. Add composite to view as they recommend here (via view.post(new Runnable))

public class TouchDelegateComposite extends TouchDelegate {

    private final List<TouchDelegate> delegates = new ArrayList<TouchDelegate>();
    private static final Rect emptyRect = new Rect();

    public TouchDelegateComposite(View view) {
        super(emptyRect, view);
    }

    public void addDelegate(TouchDelegate delegate) {
        if (delegate != null) {
            delegates.add(delegate);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        boolean res = false;
        float x = event.getX();
        float y = event.getY();
        for (TouchDelegate delegate : delegates) {
            event.setLocation(x, y);
            res = delegate.onTouchEvent(event) || res;
        }
        return res;
    }

}

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