Android App----Mr Expense 之主界面

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这篇文章放在草稿箱很多天了，知道现在才发出来，主要是我的主界面和Listview相关甚大，但是博主对listview用法始终掌握不好，这几天有空的时候就看了好多文章，总结一下listview，感觉很强大的酱紫。

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先上个被我抛弃的主界面：

main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><ListView android:id="@id/android:list"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_weight="1"android:divider="@null"android:cacheColorHint="@android:color/transparent" />     
</LinearLayout>

listview.xml:

<?xml version="1.0" encoding="utf-8"?>  <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent" android:layout_height="match_parent" >  <ImageView android:id="@+id/image"  android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_centerVertical="true" android:layout_alignParentTop="true" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:adjustViewBounds="true"  android:padding="2dp" />  <TextView android:id="@+id/title"  android:layout_width="wrap_content" android:layout_height="wrap_content"  android:layout_toRightOf="@id/image"  android:layout_alignParentTop="true"  android:layout_alignWithParentIfMissing="true"   android:textSize="30dp" /><TextViewandroid:id="@+id/text"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:layout_below="@id/title"android:layout_toRightOf="@id/image"android:ellipsize="marquee"android:gravity="bottom"android:singleLine="true"android:textSize="19dp" /></RelativeLayout>

public class Main extends ListActivity {  private String[] mListTitle = { "food", "transport", "utilities", "healthcare","clothes","entertainment","others"};  private String[] mListStr = {  "今天你吃饭了吗", "今天你坐公交车了没", "今天你修爱疯了木", "今天你打针了么", "今天你买球鞋了嘛","今天你K歌了麽","也许还有一些东西-。=" };  private Object[] mListImage={R.drawable.shiwu,R.drawable.jiaotong,R.drawable.shebei,R.drawable.yiliao,R.drawable.yifu,R.drawable.yule,R.drawable.zawu};ListView mListView = null;  ArrayList<Map<String,Object>> mData= new ArrayList<Map<String,Object>>();  @Override  protected void onCreate(Bundle savedInstanceState) {  requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.main);mListView = getListView();  int lengh = mListTitle.length;  for(int i =0; i < lengh; i++) {  Map<String,Object> item = new HashMap<String,Object>(); item.put("image", mListImage[i]);  item.put("title", mListTitle[i]);  item.put("text", mListStr[i]);mData.add(item);   }  SimpleAdapter adapter = new SimpleAdapter(this,mData,R.layout.listitem,  new String[]{"image","title","text","background"},new int[]{R.id.image,R.id.title,R.id.text});  setListAdapter(adapter);  mListView.setOnItemClickListener(new OnItemClickListener() {  @Override  public void onItemClick(AdapterView<?> adapterView,View view, int position,  long id) {  Toast.makeText(Main.this,"您选择了标题：" + mListTitle[position] + "内容："+mListStr[position], Toast.LENGTH_LONG).show();  }  });  super.onCreate(savedInstanceState);  }  
}

说明：

0、主界面很简单，就一个Listview，然后每个item有3个view，好白有木有！

1、android:divider="@null"这句话会把item之间的黑线去掉，哎没去掉之前更是不忍直视

2、一开始我的Listview充满不了屏幕，然后上网问啊，有个人跟我说layout设置vertical，然后权重设1，于是如代码所示，

android:layout_weight="1"，但其实是没用的，我之所以没去掉，主要是看到能让我想起它的其他作用，权重可以分配位置的大小，但是也不是那么想当然的分配，有篇文章深入探讨了：ht@tp://mobile.51cto.com/abased-375428.htm

3、android:cacheColorHint="@android:color/transparent" 去底色，在这里可用可不用

4、Listview用的RelativeLayout，发现比LinearLayout复杂太多，常用属性：ht@tp://blog.csdn.net/notenlife/article/details/7256363

5、android:layout_centerVertical="true"让图片在imageview中居中

6、为了让Listview充满屏幕，只能调节字体的大小了，不知道还有没有其他简单高效的方法

7、android:gravity="bottom" text在最下面体现

8、android:ellipsize="marquee" android:singleLine="true"单行跑马，当然在这里是多余的。另外，想要跑马灯，设置focus，详见：ht@tp://www.cnblogs.com/Gaojiecai/archive/2013/06/18/3142783.html

9、下面来说说Listview

Listview和数据关联要用到adapter，常见的ArrayAdapter，SimpleAdapter，还有继承BaseAdapter

这个主界面是用的SimpleAdapter（this，data,layout,string,int）

getListView()是只有继承ListActivity才有的

但是这个主界面越看越不爽，有木有，虽然简约是我的风格，but做人做事那是两码子事，果断throw IT away。

我接下来就想给每个item都上个色，五彩斑斓的多好，然后其他地方也微调下。差不多就酱紫。

于是我在main.xml加了android:layout_background="@+id/background"，然后在Activity中直接把颜色put进item中，然后设置下adapter，想当然以为Listview能五颜六色了，发现报错了。。。看来这个只是用于整个Listview的背景色。

然后呢，我就用了Listview的BaseAdapter，自定义总可以了吧。

public class Main extends ListActivity {private String[] mListTitle = { "food", "transport", "utilities", "healthcare","clothes","entertainment","others"};  private String[] mListStr = {  "今天你吃饭了吗", "今天你坐公交车了没", "今天你修爱疯了木", "今天你打针了么", "今天你买球鞋了嘛","今天你K歌了麽","也许还有一些东西 -。=" };  private int[] mListImage={R.drawable.shiwu,R.drawable.jiaotong,R.drawable.shebei,R.drawable.yiliao,R.drawable.yifu,R.drawable.yule,R.drawable.zawu};private int[] mListColor=new int []{0xffff0033,0xff66cccc,0xff3333cc,0xff66cc33,0xffffcc33,0xffff9900,0xffcc6600};ListView mListView = null;MyListAdapter myAdapter = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {requestWindowFeature(Window.FEATURE_NO_TITLE);getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);setContentView(R.layout.main);mListView = getListView(); myAdapter = new MyListAdapter(this);setListAdapter(myAdapter);mListView.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> adapterView, View view, int position,long id) {View v=adapterView.getChildAt(position);Toast.makeText(Main.this,"您选择了" + mListTitle[position], Toast.LENGTH_LONG).show();}});super.onCreate(savedInstanceState);}class MyListAdapter extends BaseAdapter {private Context mContext;public MyListAdapter(Context context) { mContext = context;}public int getCount() {   return mListStr.length;}@Overridepublic boolean areAllItemsEnabled() {return false;}public Object getItem(int position) {return position;}public long getItemId(int position) {return position;}public View getView(int position, View convertView, ViewGroup parent) {ImageView image = null;TextView title = null;TextView text = null;if (convertView == null) {convertView = LayoutInflater.from(mContext).inflate(R.layout.listitem, null);image = (ImageView) convertView.findViewById(R.id.image);title =(TextView) convertView.findViewById(R.id.title);text= (TextView) convertView.findViewById(R.id.text);}  int colorPos = position % mListColor.length;convertView.setBackgroundColor(mListColor[colorPos]);image.setImageResource(mListImage[position]);title.setText(mListTitle[position]);text.setText(mListStr[position]);return convertView;}}}

效果图：