简单天气获取demo的制作（一）

简单天气获取demo的制作（一）

今天创了博客，想分享一下自己学习的东西，也作为记录自己一点一滴进步的空间吧。本人是大一学生，刚入android不久，纯正小菜鸟，平常没事喜欢写点东西，希望大神们不要抨击。（跪谢）

今天玩手机的时候看到了iphone的weather界面挺好看，于是萌生了做一个demo的想法。
界面是这样的，当时就觉得哎呦，不错哦，由于水平有限，各种折叠的动画还不会做，在这里给大家分享一下如何制作简单的weather demo吧。
好啦，是时候打开编辑器啦，首先是xml的制作，各位稍等。哈哈哈

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"

    tools:context="com.example.howard.weather.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="City"
        android:id="@+id/main_city"
        android:textSize="45sp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="weather"
        android:textSize="30sp"
        android:id="@+id/main_weather"
        android:layout_below="@+id/main_city"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="temp"
        android:textSize="60sp"
        android:id="@+id/main_tmp"
        android:layout_below="@+id/main_weather"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="25dp"/>
    <com.example.howard.weather.HorizontalListView
        android:layout_marginTop="5dp"
        android:layout_marginBottom="5dp"
        android:layout_below="@+id/main_tmp"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:id="@+id/hor_lv_main"
        android:background="@color/colorPrimaryDark"
        android:scrollbars="horizontal"></com.example.howard.weather.HorizontalListView>

    <TextView
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Monday"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:id="@+id/main_today"
        android:layout_above="@+id/hor_lv_main"
        android:layout_alignParentStart="true" />

    <TextView
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Today"
        android:id="@+id/textView2"
        android:layout_alignTop="@+id/main_today"
        android:layout_toEndOf="@+id/main_today" />

    <TextView
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="min"
        android:layout_alignTop="@+id/main_max"
        android:layout_toStartOf="@+id/main_max"
        android:layout_marginRight="15dp"
        android:id="@+id/main_min"/>

    <TextView
        android:textSize="20sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="max"
        android:layout_marginRight="20dp"
        android:id="@+id/main_max"
        android:layout_above="@+id/hor_lv_main"
        android:layout_alignParentEnd="true"/>
    <ListView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_below="@+id/hor_lv_main"
        android:id="@+id/lv_main"></ListView>
</RelativeLayout>

这就是Main xml啦 效果图是这样的。

中间那块是一个水平的listview用的别人给的框架，也不知道能不能实现，先放源码吧。

/*
 * HorizontalListView.java v1.5
 *
 * 
 * The MIT License
 * Copyright (c) 2011 Paul Soucy (paul@dev-smart.com)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

package com.example.howard.weather;

import java.util.LinkedList;
import java.util.Queue;

import android.annotation.SuppressLint;
import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.Scroller;

public class HorizontalListView extends AdapterView<ListAdapter> {

    public boolean mAlwaysOverrideTouch = true;
    protected ListAdapter mAdapter;
    private int mLeftViewIndex = -1;
    private int mRightViewIndex = 0;
    protected int mCurrentX;
    protected int mNextX;
    private int mMaxX = Integer.MAX_VALUE;
    private int mDisplayOffset = 0;
    protected Scroller mScroller;
    private GestureDetector mGesture;
    private Queue<View> mRemovedViewQueue = new LinkedList<View>();
    private OnItemSelectedListener mOnItemSelected;
    private OnItemClickListener mOnItemClicked;
    private OnItemLongClickListener mOnItemLongClicked;
    private boolean mDataChanged = false;


    public HorizontalListView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView();
    }

    private synchronized void initView() {
        mLeftViewIndex = -1;
        mRightViewIndex = 0;
        mDisplayOffset = 0;
        mCurrentX = 0;
        mNextX = 0;
        mMaxX = Integer.MAX_VALUE;
        mScroller = new Scroller(getContext());
        mGesture = new GestureDetector(getContext(), mOnGesture);
    }

    @Override
    public void setOnItemSelectedListener(OnItemSelectedListener listener) {
        mOnItemSelected = listener;
    }

    @Override
    public void setOnItemClickListener(OnItemClickListener listener){
        mOnItemClicked = listener;
    }

    @Override
    public void setOnItemLongClickListener(OnItemLongClickListener listener) {
        mOnItemLongClicked = listener;
    }

    @Override
    public void setOnKeyListener(OnKeyListener l) {
        super.setOnKeyListener(l);
    }


    private DataSetObserver mDataObserver = new DataSetObserver() {

        @Override
        public void onChanged() {
            synchronized(HorizontalListView.this){
                mDataChanged = true;
            }
            invalidate();
            requestLayout();
        }

        @Override
        public void onInvalidated() {
            reset();
            invalidate();
            requestLayout();
        }

    };

    @Override
    public ListAdapter getAdapter() {
        return mAdapter;
    }

    @Override
    public View getSelectedView() {
        //TODO: implement
        return null;
    }

    @Override
    public void setAdapter(ListAdapter adapter) {
        if(mAdapter != null) {
            mAdapter.unregisterDataSetObserver(mDataObserver);
        }
        mAdapter = adapter;
        mAdapter.registerDataSetObserver(mDataObserver);
        reset();
    }

    private synchronized void reset(){
        initView();
        removeAllViewsInLayout();
        requestLayout();
    }

    @Override
    public void setSelection(int position) {
        //TODO: implement
    }

    private void addAndMeasureChild(final View child, int viewPos) {
        LayoutParams params = child.getLayoutParams();
        if(params == null) {
            params = new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
        }

        addViewInLayout(child, viewPos, params, true);
        child.measure(MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.AT_MOST),
                MeasureSpec.makeMeasureSpec(getHeight(), MeasureSpec.AT_MOST));
    }


    @SuppressLint("DrawAllocation")
    @Override
    protected synchronized void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);

        if(mAdapter == null){
            return;
        }

        if(mDataChanged){
            int oldCurrentX = mCurrentX;
            initView();
            removeAllViewsInLayout();
            mNextX = oldCurrentX;
            mDataChanged = false;
        }

        if(mScroller.computeScrollOffset()){
            int scrollx = mScroller.getCurrX();
            mNextX = scrollx;
        }

        if(mNextX <= 0){
            mNextX = 0;
            mScroller.forceFinished(true);
        }
        if(mNextX >= mMaxX) {
            mNextX = mMaxX;
            mScroller.forceFinished(true);
        }

        int dx = mCurrentX - mNextX;

        removeNonVisibleItems(dx);
        fillList(dx);
        positionItems(dx);

        mCurrentX = mNextX;

        if(!mScroller.isFinished()){
            post(new Runnable(){
                @Override
                public void run() {
                    requestLayout();
                }
            });

        }
    }

    private void fillList(final int dx) {
        int edge = 0;
        View child = getChildAt(getChildCount()-1);
        if(child != null) {
            edge = child.getRight();
        }
        fillListRight(edge, dx);

        edge = 0;
        child = getChildAt(0);
        if(child != null) {
            edge = child.getLeft();
        }
        fillListLeft(edge, dx);
    }

    private void fillListRight(int rightEdge, final int dx) 
    {
        while(rightEdge + dx < getWidth() && mRightViewIndex < mAdapter.getCount()) {

            View child = mAdapter.getView(mRightViewIndex, mRemovedViewQueue.poll(), this);