android Button按下及抬起监听事件

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首先我们在布局中，写入Button按钮

<?xml version="1.0" encoding="utf-8"?><LinearLayout    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"    android:orientation="vertical"    tools:context="test.bwie.com.wzq_20170921day20.MainActivity"    >    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:id="@+id/btn"        android:layout_gravity="center"        android:text="点我有惊喜"/></LinearLayout>

在MainActivity 中使用 OnTouchListener 的监听事件

package test.bwie.com.wzq_20170921day20;import android.graphics.Color;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.MotionEvent;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends AppCompatActivity {    private Button btn;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btn = (Button) findViewById(R.id.btn);        //监听        btn.setOnTouchListener(new View.OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent event) {                if(event.getAction() == MotionEvent.ACTION_DOWN){                    Toast.makeText(MainActivity.this,"按下了" ,Toast.LENGTH_SHORT).show();                    btn.setBackgroundColor(Color.RED);                }else if(event.getAction() == MotionEvent.ACTION_UP){                    Toast.makeText(MainActivity.this,"松开了" ,Toast.LENGTH_SHORT).show();                    btn.setBackgroundColor(Color.BLUE);                }                return false;            }        });    }}

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