OnClickListener doesn't work with clickable at

问题:

So, my problem is that OnClickListener doesn't work when I set android:clickable="true" into my class.

This is MyClass xml code:

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/background"
    android:clickable="true">
...
...
</RelativeLayout>

MyClass.java:

public class MyClass extends RelativeLayout implements OnClickListener {
    public MyClass(Context context) {
        super(context);

        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater.inflate(R.layout.book_item, this);
        setOnClickListener(this);
    }

    public void onClick(View v) {
        Log.v("TAG", "Hello");
    }
...
...
}

It works fine when I set android:clickable to false. What do I wrong?

回答1:

Setting an OnClickListener will automatically set the clickable property to true. The code you are showing is confusing though. My understanding is that your MyClass view is the parent of the RelativeLayout shown in the XML file.

If so, the child RelativeLayout will get the touch events first (since it's clickable) but won't do anything with them since it doesn't have a click listener.

Just remove clickable=true from your XML.

回答2:

when you do this: android:clickable="true" you disable the onClickListener (its not logical but its like that..).

So set it to "false" or just remove this line from your XML file ;)

回答3:

Add id to your layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/yourId"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@drawable/background"
android:clickable="true">
</RelativeLayout>

Then in java code:

public class MyClass extends RelativeLayout implements OnClickListener {
    public MyClass(Context context) {
        super(context);

        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater.inflate(R.layout.book_item, this);
        findViewById(R.id.yourId).setOnClickListener(this);
    }

    public void onClick(View v) {
        Log.v("TAG", "Hello");
    }
...
...
}

回答4:

 ((RelativeLayout)findViewById(R.id.yourId)).setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {
            if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
                //code area ...
                Log.v("TAG", "Hello");

                return true;
            } else{
                return false;
            }
        }
    });

You can use this way too.