button的操作

 1. 对button按钮的抬起 按下的一些操作一级监听//在xml中写button布局<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.bwie.activity.MainActivity">    <Button        android:id="@+id/button"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="onclick"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent"        android:background="@drawable/onclick"        /></android.support.constraint.ConstraintLayout>//在main方法中进行触摸监听以及获取idpublic class MainActivity extends AppCompatActivity {    private Button button;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button = (Button) findViewById(R.id.button);        Buttonlister buttonlister=new Buttonlister();        button.setOnTouchListener(buttonlister);    }    class Buttonlister implements View.OnTouchListener{        @Override        public boolean onTouch(View view, MotionEvent motionEvent) {            switch (view.getId()){                case R.id.button:                    if(motionEvent.getAction()==MotionEvent.ACTION_UP){                        Toast.makeText(MainActivity.this,"抬起",Toast.LENGTH_SHORT).show();                     //   button.setBackgroundColor(Color.GREEN);                    }else if(motionEvent.getAction()==MotionEvent.ACTION_DOWN){                        Toast.makeText(MainActivity.this,"按下",Toast.LENGTH_SHORT).show();                      //  button.setBackgroundColor(Color.RED);                    }                    break;            }            return false;        }    }}