1、相关属性
Android的按钮有Button和ImageButton（图像按钮），Button extends TextView， ImageButton extends ImageView！
android:layout_width="match_parent" //宽度
android:layout_height="wrap_content" //高度
android:id="@+id/btn11" //id
android:text="按钮1" //按钮文本
android:textColor="@color/colorPrimary" //文本颜色
android:onClick="click11" //点击事件
android:clickable="true" //是否可点击
android:background="@drawable/btn_bg_color" //背景色
2、关于按钮的点击事件
布局文件xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
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=".LoginActivity"> <Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/btn11"
android:text="按钮1"
android:textColor="@color/colorPrimary"
android:onClick="click11"
android:clickable="true"
android:background="@drawable/btn_bg_color"/>
<com.example.xianfengzhang.myapplication.CustomView.MyButton
android:layout_width="match_parent"
android:layout_height="64dp"
android:id="@+id/btn22"
android:textColor="@color/colorPrimary"
android:scaleType="center"
/>
</LinearLayout>
java文件（包括三种点击事件）
public class LoginActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
// Set up the login form.
Button btn = (Button)findViewById(R.id.btn11);
MyButton btn2 =(MyButton)findViewById(R.id.btn22);
btn.setOnClickListener(this);
btn2.setOnClickListener(this);
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Log.i("点击事件","点击了按钮");
}
});
btn2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
Log.i("btn22方式","点击了按钮");
}
});
}
public void onClick(View view){
switch (view.getId()){
case R.id.btn11:
Log.i("btn11方式","点击了按钮");
break;
case R.id.btn22:
Log.i("btn22方式","点击了按钮");
break;
}
}
public void click11(View v){
Log.i("指定onClick属性方式","点击了按钮");
}
}
根据执行优先级和耦合度排序
1）使用activity继承View.OnClickListener单击事件监听类，由activity实现OnClick(View view)方法，在OnClick(View view)方法中用switch-case对不同id代表的button进行相应的处理：
2）通过内部类setOnClickListener实现：
3）设置Button的onClick点击方法名：
在activity中实现方法：
3、MyButton自定义文件
package com.example.xianfengzhang.myapplication.CustomView; import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import android.widget.ImageButton; /**
* Created by xianfengzhang on 2017/12/20.
*/ @SuppressLint("AppCompatCustomView")
public class MyButton extends android.support.v7.widget.AppCompatImageButton { private static final int INVALIDATE_DURATION = 15; //每次刷新的时间间隔
private static int DIFFUSE_GAP = 10; //扩散半径增量
private static int TAP_TIMEOUT; //判断点击和长按的时间 private int viewWidth, viewHeight; //控件宽高
private int pointX, pointY; //控件原点坐标（左上角）
private int maxRadio; //扩散的最大半径
private int shaderRadio; //扩散的半径 private Paint bottomPaint, colorPaint; //画笔:背景和水波纹
private boolean isPushButton; //记录是否按钮被按下 private int eventX, eventY; //触摸位置的X,Y坐标
private long downTime = 0; //按下的时间 public MyButton(Context context) {
super(context);
} public MyButton(Context context, AttributeSet attrs){
super(context, attrs);
initPaint();
TAP_TIMEOUT = ViewConfiguration.getLongPressTimeout();//获取长按时间 } private void initPaint(){
colorPaint = new Paint();
bottomPaint = new Paint();
colorPaint.setColor(Color.WHITE);
bottomPaint.setColor(Color.GRAY);
} @Override
public boolean onTouchEvent(MotionEvent event){
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
if (downTime == 0) downTime = SystemClock.elapsedRealtime();
eventX = (int)event.getX();
eventY = (int)event.getY();
countMaxRadio();
isPushButton = true;
postInvalidateDelayed(INVALIDATE_DURATION);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
if (SystemClock.elapsedRealtime() -downTime <TAP_TIMEOUT){
DIFFUSE_GAP = 30;
postInvalidate();
}else {
clearData();
}
break;
}
return super.onTouchEvent(event);
} @Override
protected void dispatchDraw(Canvas canvas) {
super.dispatchDraw(canvas);
if(!isPushButton) return; //如果按钮没有被按下则返回
//绘制按下后的整个背景
canvas.drawRect(pointX, pointY, pointX + viewWidth, pointY + viewHeight, bottomPaint);
canvas.save();
//绘制扩散圆形背景
canvas.clipRect(pointX, pointY, pointX + viewWidth, pointY + viewHeight);
canvas.drawCircle(eventX, eventY, shaderRadio, colorPaint);
canvas.restore();
//直到半径等于最大半径
if(shaderRadio < maxRadio){
postInvalidateDelayed(INVALIDATE_DURATION,
pointX, pointY, pointX + viewWidth, pointY + viewHeight);
shaderRadio += DIFFUSE_GAP;
}else{
clearData();
}
} private void countMaxRadio() {
if (viewWidth > viewHeight) {
if (eventX < viewWidth / 2) {
maxRadio = viewWidth - eventX;
} else {
maxRadio = viewWidth / 2 + eventX;
}
} else {
if (eventY < viewHeight / 2) {
maxRadio = viewHeight - eventY;
} else {
maxRadio = viewHeight / 2 + eventY;
}
}
} private void clearData(){
downTime = 0;
DIFFUSE_GAP = 10;
isPushButton = false;
shaderRadio = 0;
postInvalidate();
} // 在控件大小发生改变时调用。所以这里初始化会被调用一次
// 作用：获取控件的宽和高度
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
this.viewWidth = w;
this.viewHeight = h;
} }