@SuppressLint(“SetTextI18n”)
@Override
public void onNext(WeatherBean weatherBean) {
//在主线程中处理得到的数据
}
@Override
public void onError(Throwable e) {
}
@Override
public void onComplete() {
}
});
}
###自定义View
布局中间展示未来15天天气，数据有日期、最高温度、最低温度、类型、类型图标，其中温度连成两条曲线，整体支持滑动。
我是这样设计的，温度曲线初始为两条直线，为这15天的平均值，然后开始变化，变到对应的值，从而形成曲线效果。
新建MyCurveView.java，继承自View。添加WeatherData内部类，添加对应的属性及get、set方法。
static class WeatherData {
private float lowTemp;
private float highTemp;
private int date;
private String type;
private Bitmap typeBitmap;
WeatherData(float lowTemp, float highTemp, int date, String type, Bitmap typeBitmap) {
this.lowTemp = lowTemp;
this.highTemp = highTemp;
this.date = date;
this.type = type;
this.typeBitmap = typeBitmap;
}
…
}
添加setProgress()方法，在网络请求完毕后，调用该方法更新数据和UI。首先调用arrayList保存网络数据，然后在动画中不断更新视图。
public void setProgress(int averageHigh, int averageLow, final int low, int top, ArrayList innerData) {
arrayList(innerData, top, low, averageHigh, averageLow);
ValueAnimator animatorHigh = ValueAnimator.ofInt(0, top);
animatorHigh.setDuration(1000);
animatorHigh.setInterpolator(new AccelerateInterpolator());
animatorHigh.addUpdateListener(valueAnimator -> {
mHighPercent = (int)valueAnimator.getAnimatedValue();
invalidate();
});
ValueAnimator animatorLow = ValueAnimator.ofInt(0, low);
animatorLow.setDuration(1000);
animatorLow.setInterpolator(new AccelerateInterpolator());
animatorLow.addUpdateListener(valueAnimator -> {
mLowPercent = (int)valueAnimator.getAnimatedValue();
});
AnimatorSet set = new AnimatorSet();
//两个动画同时进行
set.playTogether(animatorHigh, animatorLow);
//监听动画
set.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
//在做动画的时间内，通过该标志位禁止触摸动作
isAnimation = true;
}
@Override
public void onAnimationEnd(Animator animation) {
isAnimation = false;
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
set.start();
}
arrayList()方法，除了保存数据外，将温度做个转换，因为初始是从平均值开始变的，mHighPercent在1s的时间内从0变为15日最高温度值，mHighPercent * (innerData.get(i).getHighTemp() – averageHigh) / (max – 0)可以做到在1s的时间内，将当日最高温度从平均值变为实际值，当日最低温度同理。
@SuppressWarnings(“PointlessArithmeticExpression”)
private void arrayList(ArrayList innerData, int max, int min, int averageHigh, int averageLow) {
high = averageHigh;
low = averageLow;
dataArray.clear();
//保存网络数据
dataArray.addAll(innerData);
for (int i = 0; i < innerData.size(); i++) {
//在1s的变化时间内，将值从平均值变为实际值
dataArray.get(i).setHighTemp((innerData.get(i).getHighTemp() - averageHigh) / (max - 0));
//在1s的变化时间内，将值从平均值变为实际值
dataArray.get(i).setLowTemp((averageLow - innerData.get(i).getLowTemp()) / (min - 0));
}
}
重写onMeasure()。
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int widthSize = MeasureSpec.getSize(widthMeasureSpec);
int heightSize = MeasureSpec.getSize(heightMeasureSpec);
measureWidth = widthSize;
measureHeight = heightSize;
//一个页面展示6天的温度信息，每一天为宽度为mTempWidth
mTempWidth = measureWidth / 6;
setMeasuredDimension(widthSize, heightSize);
}
重写onDraw()。
@SuppressLint(“DrawAllocation”)
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//为请求到网络数据时，页面显示文字
if (dataArray.size() <= 0) {
drawNoDataText(canvas);
} else {
float startX = mStartX + (mTempWidth / 2);
for (int i = 0; i < dataArray.size(); i++) {
//绘制天气图标
RectF rectF = new RectF(startX - 30, 300, startX + 30, 360);
canvas.drawBitmap(dataArray.get(i).getTypeBitmap(), null, rectF, mCurvePaint);
//绘制最高温度
float highTextWidth = mTempTextPaint.measureText((int)(high + mHighPercent * dataArray.get(i).getHighTemp()) + “”);
float highTextStartX = startX - highTextWidth / 2;
drawTempText(canvas, (int)(high + getHighTempByPercent(i)) + “”, highTextStartX, (140 - curve_ratio * getHighTempByPercent(i)));
//curve_ratio为可变值，用于调整显示效果。该值越大温度差效果越明显。
canvas.drawCircle(startX, (160 - curve_ratio * getHighTempByPercent(i)), 5, circlePaint);
//第一段曲线
if (i == 0) {
highPath.moveTo(startX, (160 - curve_ratio * getHighTempByPercent(i)));
highControlPt1X = startX + mTempWidth / 4;
highControlPt1Y = 160 - curve_ratio * getHighTempByPercent(i);
highControlPt2X = startX + (mTempWidth / 4) * 3;
highControlPt2Y = ((160 - curve_ratio * getHighTempByPercent(i + 1))) - (((160 - curve_ratio * getHighTempByPercent(i + 2))) - ((160 - curve_ratio * getHighTempByPercent(i)))) / 4;
//3阶贝塞尔曲线
highPath.cubicTo(
highControlPt1X, highControlPt1Y,
highControlPt2X, highControlPt2Y,
startX + mTempWidth, (160 - curve_ratio * getHighTempByPercent(i + 1)));
canvas.drawPath(highPath, mCurvePaint);
//每次绘制后将画笔恢复
highPath.reset();
}
//中间曲线
if (i != 0 && i < dataArray.size() - 2) {
highPath.moveTo(startX, (160 - curve_ratio * getHighTempByPercent(i)));
highControlPt1X = startX + mTempWidth / 4;
highControlPt1Y = ((160 - curve_ratio * getHighTempByPercent(i))) + (((160 - curve_ratio * getHighTempByPercent(i + 1))) - ((160 - curve_ratio * getHighTempByPercent(i - 1)))) / 4;
highControlPt2X = startX + (mTempWidth / 4) * 3;
highControlPt2Y = ((160 - curve_ratio * getHighTempByPercent(i + 1))) - (((160 - curve_ratio * getHighTempByPercent(i + 2))) - ((160 - curve_ratio * getHighTempByPercent(i)))) / 4;
highPath.cubicTo(
highControlPt1X,
highControlPt1Y,
highControlPt2X, highControlPt2Y,
startX + mTempWidth, (160 - curve_ratio * getHighTempByPercent(i + 1)));
canvas.drawPath(highPath, mCurvePaint);
highPath.reset();
}
//最后一段曲线
if (i == dataArray.size() - 2) {
highPath.moveTo(startX, (160 - curve_ratio * getHighTempByPercent(i)));
highControlPt1X = startX + mTempWidth / 4;
highControlPt1Y = ((160 - curve_ratio * getHighTempByPercent(i))) + (((160 - curve_ratio * getHighTempByPercent(i + 1))) - ((160 - curve_ratio * getHighTempByPercent(i - 1)))) / 4;
highControlPt2X = startX + (mTempWidth / 4) * 3;
highControlPt2Y = 160 - curve_ratio * getHighTempByPercent(i + 1);
highPath.cubicTo(
highControlPt1X, highControlPt1Y,
highControlPt2X, highControlPt2Y,
startX + mTempWidth, (160 - curve_ratio * getHighTempByPercent(i + 1)));
canvas.drawPath(highPath, mCurvePaint);
highPath.reset();
}
//绘制最低温度，与绘制最高温度类似
…
//绘制日期
float dayTextWidth = mTextPaint.measureText(dataArray.get(i).getDate() + “日”);
float dayStartX = startX - dayTextWidth / 2;
float dayTextStartY = 40 + getFontAscentHeight(mTextPaint);
drawDayText(canvas, dataArray.get(i).getDate() + “日”, dayStartX, dayTextStartY);
//绘制天气
float typeTextWidth = mTextPaint.measureText(dataArray.get(i).getType());
float typeTextStartX = startX - typeTextWidth / 2;
float typeTextStartY = measureHeight - 40 - getFontDescentHeight(mTextPaint);
canvas.drawText(dataArray.get(i).getType(), typeTextStartX, typeTextStartY, mTextPaint);
//每绘制完一天，往后移动mTempWidth距离，绘制下一天
startX = startX + mTempWidth;
}
}
}
其中的一些参数是可以根据需要更改的。
重写dispatchTouchEvent()。当滑动到最左边也就是第一天的时候，应该禁止继续向右继续滑动。滑动到最右边同理。
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
int dispatchCurrX = (int) ev.getX();
int dispatchCurrY = (int) ev.getY();
switch (ev.getAction()) {
…
case MotionEvent.ACTION_MOVE:
float deltaX = dispatchCurrX - dispatchTouchX;
float deltaY = dispatchCurrY - dispatchTouchY;
//竖直滑动的父容器拦截事件
if (Math.abs(deltaY) - Math.abs(deltaX) > 0) {
getParent().requestDisallowInterceptTouchEvent(false);
}
//向右滑动，滑动到左边边界，父容器进行拦截
if ((dispatchCurrX - dispatchTouchX) > 0 && mStartX == 0) {
getParent().requestDisallowInterceptTouchEvent(false);
} else if ((dispatchCurrX - dispatchTouchX) < 0 && mStartX == -getMoveLength()) {
//向左滑动，滑动到右边边界，父容器进行拦截
getParent().requestDisallowInterceptTouchEvent(false);
}
break;
…
}
dispatchTouchX = dispatchCurrX;
dispatchTouchY = dispatchCurrY;
return super.dispatchTouchEvent(ev);
}
重写onTouchEvent()。
@SuppressLint(“ClickableViewAccessibility”)
@Override
public boolean onTouchEvent(MotionEvent event) {
//如果正在执行动画，直接返回
if (isAnimation) {
return true;
}
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
}
mVelocityTracker.addMovement(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
lastX = event.getX();
//当点击的时候，判断如果是在fling的效果的时候，就停止快速滑动
if (isFling) {
removeCallbacks(mScrollRunnable);
isFling = false;
}
break;
case MotionEvent.ACTION_MOVE:
float currX = event.getX();
mStartX += currX - lastX;
//计算每次滑动后的mStartX
//向右滑动
if ((currX - lastX) > 0) {
if (mStartX > 0) {
mStartX = 0;
}
} else {//向左滑动
if (-mStartX > getMoveLength()) {
mStartX = -getMoveLength();
}
}
lastX = currX;
break;
case MotionEvent.ACTION_UP:
//1s内的滑动速度
mVelocityTracker.computeCurrentVelocity(1000);
//计算快速滑动的速度，如果是大于某个值，并且数据的长度大于整个屏幕的长度，那么就允许有fling后逐渐停止的效果
if (Math.abs(mVelocityTracker.getXVelocity()) > 100
&& !isFling && measureWidth < dataArray.size() * mTempWidth) {
mScrollRunnable = new ScrollRunnable(mVelocityTracker.getXVelocity() / 5);
this.post(mScrollRunnable);
}
break;
case MotionEvent.ACTION_CANCEL:
break;
}
return true;
}
private class ScrollRunnable implements Runnable {
private float speed;
ScrollRunnable(float speed) {
this.speed = speed;
}
@Override
public void run() {
if (Math.abs(speed) < 60) {
isFling = false;
return;
}
isFling = true;
mStartX += speed / 15;
//速度有一个渐慢的效果
speed = speed / 1.1f;
//向右滑动
if ((speed) > 0) {
if (mStartX > 0) {
mStartX = 0;
}
} else {
//向右滑动
if (-mStartX > getMoveLength()) {
mStartX = -getMoveLength();
}
}
postDelayed(this, 5);
invalidate();
}
}
以上为部分主要代码，自定义View就算是完成了。
###城市搜索
使用单独一个Activity，使用了DataBinding来做搜索编辑框的绑定，RecyclerView用来展示返回的城市列表，选择其中的某一城市后，通过EventBus将城市信息通知MainActivity。新建CityActivity，添加CityViewHolder类，并在其中添加afterTextChanged(Editable s)方法,在onCreate中完成代码和视图的绑定
public class CityActivity extends AppCompatActivity {
…
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//绑定代码和视图
ActivityCityBinding activityCityBinding = DataBindingUtil.setContentView(this, R.layout.activity_city);
activityCityBinding.setCityViewHolder(new CityViewHolder());
…
}
…
public class CityViewHolder {
public void afterTextChanged(Editable s) {
}
}
}
修改对应的activity_city.xml
<?xml version="1.0" encoding="utf-8"?>…
+id/search_edittext" android:layout_width="match_parent" android:layout_height="wrap_content" android:padding="5dp" android:background="@drawable/et_bgd" android:focusable="true" android:textSize="16sp" android:maxLines="1" android:singleLine="true" android:hint="输入城市" android:textColorHint="#40000000" android:afterTextChanged="@{cityPresenter.afterTextChanged}"/>…