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" />    <TextView        android: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;        @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();     myAdapter = new MyListAdapter(this);    setListAdapter(myAdapter);    mListView.setOnItemClickListener(new OnItemClickListener() {    @Override    public 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;    }    @Override    public 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:


既然走的是“色”的路线,那么欢迎界面也该搞得“色”一点,这样跳跃才不会太大,O(∩_∩)O~

OK,到此主界面先这样,还木有数据的处理呢。

作业可以先handle了,接下来该去看看怎么搞数据了。


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4.23 nju

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