移动小球和彩色波纹
2016-05-11 20:07
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移动小球
1.Value
加attrs
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="MyCircle">
<attr name="radius" format="integer"/>
<attr name="mycolor" format="reference|color"/>
</declare-styleable>
</resources>
2自定义View
package com.ch.myviews;
import com.ch.myviewattr.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class MyCircle extends View {
private Paint paint;
private int radius;
private float currentx = 50;
private float currenty = 50;
// private final static String NAMESPACE = "aaa1407a";
public MyCircle(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
//获得自定义的属性，即获得自定义的半径
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.MyCircle);
radius = ta.getInt(R.styleable.MyCircle_radius, 0);
ta.recycle();
// radius = attrs.getAttributeIntValue(NAMESPACE, "radius", 0);
}
//绘制的方法
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
paint = new Paint();
paint.setColor(Color.RED);
// canvas.drawColor(Color.BLUE);
// canvas.drawCircle(getWidth()/2, getHeight()/2, radius, paint);
Log.d("TAG","onDraw............."+getWidth()/2+","+getHeight()/2);
Log.d("TAG","onDraw.....Measured........"+getMeasuredWidth()/2+","+getMeasuredHeight()/2);
//配合拖拽移动
canvas.drawCircle(currentx, currenty, radius, paint);
super.onDraw(canvas);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
Log.d("TAG", "圆被拖动了....");
currentx = event.getX();
currenty = event.getY();
invalidate();//重新绘制此view
return true;
}
// @Override
// public void layout(int l, int t, int r, int b) {
// // TODO Auto-generated method stub
// super.layout(10, 10, 500, 700);
// }
}
3布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:myattr="http://schemas.android.com/apk/res/com.ch.myviewattr"//最后的是包名
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<com.ch.myviews.MyCircle
android:id="@+id/mc"
android:layout_below="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
myattr:radius="50"
/>
</RelativeLayout>
彩色波纹
如图
自定义View
代码
package com.itheima.ring;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
/**
* 水波纹效果
* @author leo
*
*/
public class MyRingWave extends View{
/**
* 二个相临波浪中心点的最小距离
*/
private static final int DIS_SOLP = 13;
protected boolean isRunning = false;
private ArrayList<Wave> wList;
public MyRingWave(Context context, AttributeSet attrs) {
super(context, attrs);
wList = new ArrayList<MyRingWave.Wave>();
}
private Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {
//刷新数据
flushData();
//刷新页面
invalidate();
//循环动画
if (isRunning) {
handler.sendEmptyMessageDelayed(0, 50);
}
};
};
@Override
protected void onDraw(Canvas canvas) {
for (int i = 0; i < wList.size(); i++) {
Wave wave = wList.get(i);
canvas.drawCircle(wave.cx, wave.cy, wave.r, wave.p);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
int x = (int) event.getX();
int y = (int) event.getY();
addPoint(x,y);
break;
default:
break;
}
return true;
}
/**
* 添加新的波浪中心点
* @param x
* @param y
*/
private void addPoint(int x, int y) {
if(wList.size() == 0){
addPoint2List(x,y);
/*
* 第一次启动动画
*/
isRunning = true;
handler.sendEmptyMessage(0);
}else{
Wave w = wList.get(wList.size()-1);
if(Math.abs(w.cx - x)>DIS_SOLP || Math.abs(w.cy-y)>DIS_SOLP){
addPoint2List(x,y);
}
};
}
/**
* 添加新的波浪
* @param x
* @param y
*/
private void addPoint2List(int x, int y) {
Wave w = new Wave();
w.cx = x;
w.cy=y;
Paint pa=new Paint();
pa.setColor(colors[(int)(Math.random()*4)]);
pa.setAntiAlias(true);
pa.setStyle(Style.STROKE);
w.p = pa;
wList.add(w);
}
private int [] colors = new int[]{Color.BLUE,Color.RED,Color.YELLOW,Color.GREEN};
/**
* 刷新数据
*/
private void flushData() {
for (int i = 0; i < wList.size(); i++) {
Wave w = wList.get(i);
//如果透明度为 0 从集合中删除
int alpha = w.p.getAlpha();
if(alpha == 0){
wList.remove(i); //删除i 以后，i的值应该再减1 否则会漏掉一个对象，不过，在此处影响不大，效果上看不出来。
continue;
}
alpha-=5;
if(alpha<5){
alpha =0;
}
//降低透明度
w.p.setAlpha(alpha);
//扩大半径
w.r = w.r+3;
//设置半径厚度
w.p.setStrokeWidth(w.r/3);
}
/*
* 如果集合被清空，就停止刷新动画
*/
if(wList.size() == 0){
isRunning = false;
}
}
/**
* 定义一个波浪
* @author leo
*/
private class Wave {
//圆心
int cx;
int cy;
//画笔
Paint p;
//半径
int r;
}
}
布局
<com.itheima.ring.MyRingSimple
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
/>
1.Value
加attrs
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="MyCircle">
<attr name="radius" format="integer"/>
<attr name="mycolor" format="reference|color"/>
</declare-styleable>
</resources>
2自定义View
package com.ch.myviews;
import com.ch.myviewattr.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
public class MyCircle extends View {
private Paint paint;
private int radius;
private float currentx = 50;
private float currenty = 50;
// private final static String NAMESPACE = "aaa1407a";
public MyCircle(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
//获得自定义的属性，即获得自定义的半径
TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.MyCircle);
radius = ta.getInt(R.styleable.MyCircle_radius, 0);
ta.recycle();
// radius = attrs.getAttributeIntValue(NAMESPACE, "radius", 0);
}
//绘制的方法
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
paint = new Paint();
paint.setColor(Color.RED);
// canvas.drawColor(Color.BLUE);
// canvas.drawCircle(getWidth()/2, getHeight()/2, radius, paint);
Log.d("TAG","onDraw............."+getWidth()/2+","+getHeight()/2);
Log.d("TAG","onDraw.....Measured........"+getMeasuredWidth()/2+","+getMeasuredHeight()/2);
//配合拖拽移动
canvas.drawCircle(currentx, currenty, radius, paint);
super.onDraw(canvas);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
Log.d("TAG", "圆被拖动了....");
currentx = event.getX();
currenty = event.getY();
invalidate();//重新绘制此view
return true;
}
// @Override
// public void layout(int l, int t, int r, int b) {
// // TODO Auto-generated method stub
// super.layout(10, 10, 500, 700);
// }
}
3布局
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:myattr="http://schemas.android.com/apk/res/com.ch.myviewattr"//最后的是包名
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<com.ch.myviews.MyCircle
android:id="@+id/mc"
android:layout_below="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
myattr:radius="50"
/>
</RelativeLayout>
彩色波纹
如图
自定义View
代码
package com.itheima.ring;
import java.util.ArrayList;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
/**
* 水波纹效果
* @author leo
*
*/
public class MyRingWave extends View{
/**
* 二个相临波浪中心点的最小距离
*/
private static final int DIS_SOLP = 13;
protected boolean isRunning = false;
private ArrayList<Wave> wList;
public MyRingWave(Context context, AttributeSet attrs) {
super(context, attrs);
wList = new ArrayList<MyRingWave.Wave>();
}
private Handler handler = new Handler(){
public void handleMessage(android.os.Message msg) {
//刷新数据
flushData();
//刷新页面
invalidate();
//循环动画
if (isRunning) {
handler.sendEmptyMessageDelayed(0, 50);
}
};
};
@Override
protected void onDraw(Canvas canvas) {
for (int i = 0; i < wList.size(); i++) {
Wave wave = wList.get(i);
canvas.drawCircle(wave.cx, wave.cy, wave.r, wave.p);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
super.onTouchEvent(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
case MotionEvent.ACTION_MOVE:
int x = (int) event.getX();
int y = (int) event.getY();
addPoint(x,y);
break;
default:
break;
}
return true;
}
/**
* 添加新的波浪中心点
* @param x
* @param y
*/
private void addPoint(int x, int y) {
if(wList.size() == 0){
addPoint2List(x,y);
/*
* 第一次启动动画
*/
isRunning = true;
handler.sendEmptyMessage(0);
}else{
Wave w = wList.get(wList.size()-1);
if(Math.abs(w.cx - x)>DIS_SOLP || Math.abs(w.cy-y)>DIS_SOLP){
addPoint2List(x,y);
}
};
}
/**
* 添加新的波浪
* @param x
* @param y
*/
private void addPoint2List(int x, int y) {
Wave w = new Wave();
w.cx = x;
w.cy=y;
Paint pa=new Paint();
pa.setColor(colors[(int)(Math.random()*4)]);
pa.setAntiAlias(true);
pa.setStyle(Style.STROKE);
w.p = pa;
wList.add(w);
}
private int [] colors = new int[]{Color.BLUE,Color.RED,Color.YELLOW,Color.GREEN};
/**
* 刷新数据
*/
private void flushData() {
for (int i = 0; i < wList.size(); i++) {
Wave w = wList.get(i);
//如果透明度为 0 从集合中删除
int alpha = w.p.getAlpha();
if(alpha == 0){
wList.remove(i); //删除i 以后，i的值应该再减1 否则会漏掉一个对象，不过，在此处影响不大，效果上看不出来。
continue;
}
alpha-=5;
if(alpha<5){
alpha =0;
}
//降低透明度
w.p.setAlpha(alpha);
//扩大半径
w.r = w.r+3;
//设置半径厚度
w.p.setStrokeWidth(w.r/3);
}
/*
* 如果集合被清空，就停止刷新动画
*/
if(wList.size() == 0){
isRunning = false;
}
}
/**
* 定义一个波浪
* @author leo
*/
private class Wave {
//圆心
int cx;
int cy;
//画笔
Paint p;
//半径
int r;
}
}
布局
<com.itheima.ring.MyRingSimple
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
/>
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