小写转大写 ： ctrl+shift+F
<ScrollView></ScrollView>滚动条显示视图
ListView与BaseAdapter：
1 public class MainActivity extends Activity {
2 private List<Person> pList;
3 @Override
4 protected void onCreate(Bundle savedInstanceState) {
5 super.onCreate(savedInstanceState);
6 setContentView(R.layout.activity_main);
7
8 ListView mlistview=(ListView)findViewById(R.id.listview);
9 //把view与适配器关联
10 mlistview.setAdapter(new MyAdapter());
11 }
12
13 class MyAdapter extends BaseAdapter{
14
15 //获取view数据的长度
16 @Override
17 public int getCount() {
18 return pList.size();
19 }
20
21 @Override
22 public Object getItem(int position) {
23 // TODO Auto-generated method stub
24 return null;
25 }
26
27 @Override
28 public long getItemId(int position) {
29 // TODO Auto-generated method stub
30 return 0;
31 }
32
33 //获得ListView中的某一行的view对象
34 //postion返回当前索引的位置
35 //convertView 缓存对象
36 //parent是listView对象
37 @Override
38 public View getView(int position, View convertView, ViewGroup parent) {
39 TextView tv=null;
40 if(convertView!=null){//判断缓存对象是否为空
41 tv=(TextView)convertView;
42 }else{//等于null程序刚加载，则创建
43 tv=new TextView(MainActivity.this);//类名.this ==上下文
44 }
45 Person p=pList.get(position);//获得指定位置的数据，进行对TextView绑定
46 tv.setText(p.toString());
47 return tv;
48
49 }
50
51 public View getView2(int position, View convertView, ViewGroup parent){
52 View view=null;
53
54 if(convertView==null){
55 //布局填充器对象，用于把xml布局转换成view对象
56 LayoutInflater inflator= MainActivity2.this.getLayoutInflater();
57 view=inflator.inflate(R.layout.listview2_item, null);
58 }else{
59 view=convertView;
60 }
61
62 //赋值
63 //。。。
64 return view;
65 }
66 }
67 }
ArrayAdapter与simpleAdapter：
1 public class MainActivity extends Activity {
2
3 @Override
4 protected void onCreate(Bundle savedInstanceState) {
5 super.onCreate(savedInstanceState);
6 setContentView(R.layout.activity_main);
7
8 ListView mlistview=(ListView)findViewById(R.id.list_view);
9
10 // ArrayAdapter适配器实例
11 String[] textArr={"a","b","c","d","e","f","g","h","i","t","z"};
12 //定义数据适配器
13 //用于显示简单的文本内容
14 //android.R.layout.simple_list_item_1 listview的子条目显示布局的id
15 //textArr 显示在list列表中的数据
16 ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,
17 android.R.layout.simple_list_item_1,textArr);
18 mlistview.setAdapter(adapter);
19
20
21 //context 上下文
22 //data List<Map<String,Object>> data
23 //resource listview子条目布局的id
24 //from data数据中的map集合里的key
25 //to resource中的id
26 //SimpleAdapter adp=new SimpleAdapter(context,data,resource,from,to);
27 List<Map<String,Object>> data=new ArrayList<Map<String,Object>>();
28 Map<String,Object> map=new HashMap<String,Object>();
29 map.put("name", "zhangsan1");
30 map.put("age", "17");
31 SimpleAdapter adp=new SimpleAdapter(this,data,R.layout.listview_item,
32 new String[]{"name","age"},new int[]{R.id.tv_name,R.id.tv_ico});
33 mlistview.setAdapter(adp);
34 }
35
36 }
ContentProvider：内容提供者抽象类
实现ContentProvider抽象类需要在配置文件中声明：
//并赋读写权限
<provider android:name=".provider.PersonContentProvider"
android:authorities="包名+类名" android:readPermission="随便.read"
android:writePermission="随便2.write" >
</provider>
声明权限还需要在manifest节点下添加：
<manifest>
<permission android:name="随便.read"></permission>
<permission android:name="随便2.write"></permission>
</manifest>
并在对应访问的工程的Manifest.xml中注册（不然无法访问被拒绝）：
<uses permission android:name="随便.read" />
<uses permission android:name="随便2.write" />
1 public class PersonContentProvider extends ContentProvider{
2 private static final String AUTHORITY="包名+类名";
3 private static final int PERSON_INSERT_CODE=0; //操作person表添加的操作uri匹配码
4 private Static final int PERSON_DELETE_CODE=1;
5 private Static final int PERSON_UPDATE_CODE=2;
6 private Static final int PERSON_QUERYALL_CODE=3;
7 private static UriMatcher uriMatcher;
8
9 //Person表的数据库帮助对象
10 private PersonSQLiteOpenHelper mOpenHelper;
11
12 static{
13 uriMatcher =new uriMatcher(UriMatcher.NO_MATH);
14
15 //添加一些uri(分机号)
16 //content://包名+类名/person/insert
17 uriMatcher.addURI(AUTHORITY,"person/insert",PEROSON_INSERT_CODE);
18 uriMatcher.addURI(AUTHORITY,"person/delete",PERSON_DELETE_CODE);
19 uriMatcher.addURI(AUTHORITY,"person/update",PERSON_UPDATE_CODE);
20 uriMatcher.addURI(AUTHORITY,"person/queryall",PERSON_QUERYALL_CODE);
21 }
22 @override
23 public boolean onCreate(){
24 mOpenHelper=new PersonSQLiteOpenHelper(getContext());
25 }
26
27 @override
28 public String getType(Uri uri){
29
30 }
31
32 @override
33 public Uri insert(Uri uri,ContentValues values){
34 switch(uriMatcher.match(uri)){
35 case PEROSON_INSERT_CODE:
36 SQLiteDatabase db= mOpenHelper.getWriteableDatabase();
37 if(db.isopen()){
38 long id = db.insert("person",null,values);
39 db.close();
40 return contentUris.withAppendedId(uri,id);
41 }
42 break;
43
44 default:
45 throw new IllegalArgumentException("uri不匹配":+uri);
46 }
47 return null;
48 }
49
50 @override
51 public int delete(Uri uri,String selection,String[] selectionArgs){
52 //..
53 }
54
55 @override
56 public int update(Uri uri,ConentValues values,String selection,String[] selectionArgs){
57 //...
58 }
59
60 @override
61 public Curos query(Uri uri,String[] projection,String selection,String[] selectionArgs,String sortOrder){
62 Switch(uriMatcher.match(uri)){
63 case PERSON_QUERYALL_CODE:
64 SQLiteDatabase db=mOpenHelper.getReadableDatabase();
65 if(db.isopen()){
66 Cusor cor=db.query("person",projection,selection,selectionArgs,null,null,sortOrder);
67 return cor;
68 //db.close();返回cusor结果集时不可以关闭数据库
69 }
70 break;
71 default:
72 throw new IllegalArgumentException("uri不匹配："+uri);
73 }
74 }
75
76 }
77
78 public class PersonContentResolver{
79 public void PersonInsert(){
80 Uri uri=Uri.Parser.("content://包名+类名/person/Insert");
81
82 //内容提供者对象
83 ContentResolver resolver = getContext().getContentResolver();
84 ContentValues values=new ContentValues();
85 value.put("name","小风");
86 value.put("age","19");
87
88 uri=resolver.insert(uri,values);
89 long id=ContentUris.parseId(uri);
90 log.i(tag,id);
91 }
92
93 }
时间： 2024-10-01 00:37:02