android - 如何使用多个 TouchDelegate

Question

我有两个 ImageButtons，每个都在一个 RelativeLayout 中，而这两个 RelativeLayouts 在另一个 RelativeLayout 中，我想为每个 ImageButton 设置 TouchDelegate。如果通常我将 TouchDelegate 添加到每个 ImageButton 及其父 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。所以请帮助我了解如何在两个 ImageButtons 中使用 TouchDelegate。如果不可能，那么扩展 View 点击区域的有效方法是什么？提前致谢.........

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 Activity 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);
            }
        }
    });

}

Answer 1

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

1. 创建 TouchDelegateComposite(无论您将传递什么 View 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. 按照他们的建议添加复合 View here (通过 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;
       }
   
   }