如何使用多个TouchDelegate

问题描述

我有两个ImageButtons，每个里面RelativeLayout的这两个RelativeLayouts在另一个RelativeLayout的，我想设置TouchDelegate每个的ImageButton。若平时我添加TouchDelegate到每个ImageButton的，它的父RelativeLayout的话只是一个ImageButton的正常工作，另外一个没有扩展它的点击区域。所以，请帮助我如何使用TouchDelegate两个ImageButtons。如果这是不可能的，那么有什么方法可以有效的一个方式来扩展视图的点击区域？在此先感谢........

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 ........

下面是我的xml code：

Here is my xml code:

<?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

您可以使用组合模式可以添加多个TouchDelegate到视图。步骤：

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

1. 创建TouchDelegateComposite（无论你传递作为一个什么观点的说法，它只是用来获取上下文）
2. 创建必要的TouchDelegates并将其添加到复合

3. 添加复合来查看它们推荐这里（经观。员额（新的Runnable））

1. Create TouchDelegateComposite (no matter what view you'll pass as anargument, 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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