拦截按钮点击事件(InterceptButtonClickEve

效果: 点击按钮时,你将会看到你是点击到了按钮,但没有看到点击后应该出现的吐司,

一个按钮要被拦截,要知道它是运行到哪里在执行点击后的业务逻辑的;
而点击按钮时只有当鼠标抬起时才执行,因此:看下面代码

布局代码: 就是一个按钮

<?xml version="1.0" encoding="utf-8"?>
<test.pgl.com.test.MyViewGroup xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="test.pgl.com.test.MainActivity">

    <Button
        android:onClick="click"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="按钮" />
</test.pgl.com.test.MyViewGroup>

MainActivity 代码:

package test.pgl.com.test;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

    public void click(View view) {
        Toast.makeText(this, "按钮被点击了", Toast.LENGTH_SHORT).show();
    }
}

MyViewGroup代码:

package test.pgl.com.test;

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.LinearLayout;
import android.widget.Toast;

/**
 * Created by Administrator on 2017/5/28.
 */

public class MyViewGroup extends LinearLayout {
    public MyViewGroup(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (ev.getAction()==MotionEvent.ACTION_UP)
            return true;
        else
           return false;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        Toast.makeText(getContext(), "ViewGroup被点击了", Toast.LENGTH_SHORT).show();
        return super.onTouchEvent(event);
    }
}

按钮点击后的业务逻辑在MotionEvent.ACTION_UP里:
所以找到它,直接返回一个true就不会让它走原来的逻辑了