manifest
A跳轉B,在B的文件中用permission權限,然后A就無權跳轉到B,如果在A中用uses-permission把權限給了A,那么A就可以跳轉到B了.可以通俗的說,permission給B了一把鎖,A要進門,就要用uses-permission得到一把鑰匙.
onitemclicklister+onscrolllistner
1 public class FActivity extends Activity implements OnItemClickListener,OnScrollListener{
2 private ListView lv;
3 private SimpleAdapter sim_adapter;
4 private List<Map<String, Object>>
datalist;
5 @Override
6 protected void onCreate(Bundle savedInstanceState) {
7 // TODO Auto-generated method stub
8 super.onCreate(savedInstanceState);
9 setContentView(R.layout.factivity);
10
11 lv=
(ListView) findViewById(R.id.listView1);
12 sim_adapter =
new SimpleAdapter(
this, getdata(), R.layout.item,
new String[]{
"pic",
"text"},
new int[]{R.id.imageView1,R.id.textView1});
13
14 lv.setAdapter(sim_adapter);
15 lv.setOnItemClickListener(
this);
16 lv.setOnScrollListener(
this);
17
18 }
19 private List<Map<String, Object>>
getdata(){
20 datalist =
new ArrayList<Map<String,Object>>
();
21 for (
int i=
0;i<
10;i++
)
22 {
23 Map<String, Object> map =
new HashMap<String, Object>
();
24 map.put(
"pic", R.drawable.ic_launcher);
25 map.put(
"text",
"慕課網"+
i);
26 datalist.add(map);
27 }
28 return datalist;
29 }
30 @Override
31 public void onScrollStateChanged(AbsListView view,
int scrollState) {
32 switch (scrollState) {
33 case SCROLL_STATE_FLING:
34 Map<String, Object> map =
new HashMap<String, Object>
();
35 map.put(
"pic", R.drawable.ic_launcher);
36 map.put(
"text",
"增加item");
37 datalist.add(map);
38 sim_adapter.notifyDataSetChanged();
39 break;
40 case SCROLL_STATE_IDLE:
41
42 break;
43 case SCROLL_STATE_TOUCH_SCROLL:
44
45 break;
46
47 default:
48 break;
49 }
50
51 }
52 @Override
53 public void onScroll(AbsListView view,
int firstVisibleItem,
int visibleItemCount,
int totalItemCount) {
54 // TODO 自動生成的方法存根
55
56 }
57
58 @Override
59 public void onItemClick(AdapterView<?> parent, View view,
int position,
long id) {
60 String text=lv.getItemAtPosition(position)+
"";
61 Toast.makeText(
this,
"位置："+position+
"text="+
text, Toast.LENGTH_SHORT)
62 .show();
63
64 }
65 }
?
**Picker:選擇器
DatePicker日歷選擇器
Timepicker時間選擇器**
1 public class FActivity extends Activity {
2 private TimePicker tp;
3 private DatePicker dp;
4 private Calendar cal;
5 int year;
6 int month;
7 int day;
8 int hour;
9 int minute;
10
11 @Override
12 protected void onCreate(Bundle savedInstanceState) {
13 // TODO Auto-generated method stub
14 super.onCreate(savedInstanceState);
15 setContentView(R.layout.factivity);
16
17 cal=Calendar.getInstance();
//生成日歷類的對象實例
18 year=cal.
get(Calendar.YEAR);
19 month=cal.
get(Calendar.MONTH)+
1;
//注意唯一例外是month需要+1
20 day=cal.
get(Calendar.DAY_OF_MONTH);
21 hour=cal.
get(Calendar.HOUR_OF_DAY);
22 minute=cal.
get(Calendar.MINUTE);
23 setTitle(year+
"-"+month+
"-"+day+
" "+hour+
":"+
minute);
24
25 tp=
(TimePicker) findViewById(R.id.timePicker1);
26 dp=
(DatePicker) findViewById(R.id.datePicker1);
27 dp.init(year, Calendar.MONTH, day,
new OnDateChangedListener() {
28
29 @Override
30 public void onDateChanged(DatePicker view,
int year,
int monthOfYear,
int dayOfMonth) {
31 setTitle(year+
"-"+(monthOfYear+
1)+
"-"+dayOfMonth+
" "+hour+
":"+
minute);
32
33
34 }
35 });
36 tp.setOnTimeChangedListener(
new OnTimeChangedListener() {
37
38 @Override
39 public void onTimeChanged(TimePicker view,
int hourOfDay,
int minute) {
40
41 setTitle(year+
"-"+month+
"-"+day+
" "+hourOfDay+
":"+
minute);
42 }
43 });
44 }
45
46
47 }
?
注意month的加減一問題。
datepicker需要用init（）方法，在方法中調用監聽器，而時間選擇器直接調用監聽器。
dialog形式
匿名內部類實現。
1 //參數callback是監聽器
2 new DatePickerDialog(
this,
new OnDateSetListener() {
3
4 @Override
5 public void onDateSet(DatePicker view,
int year,
int monthOfYear,
int dayOfMonth) {
6 setTitle(year+
"-"+(monthOfYear+
1)+
"-"+dayOfMonth+
" "+hour+
":"+
minute);
7
8 }
9 }, year, cal.
get(Calendar.MONTH), day).show();
10
11 new TimePickerDialog(
this,
new OnTimeSetListener() {
12
13 @Override
14 public void onTimeSet(TimePicker view,
int hourOfDay,
int minute) {
15 setTitle(year+
"-"+month+
"-"+day+
" "+hourOfDay+
":"+
minute);
16
17 }
18 }, hour, minute,
true);
19 }
?
gridview
1 public class FActivity extends Activity implements OnItemClickListener{
2 private GridView gv;
3 private SimpleAdapter sim_adapter;
4 private List<Map<String, Object>>
datalist;
5 int[] iconid=
{R.drawable.calculate,R.drawable.calendar,R.drawable.clock,
6 R.drawable.contact,R.drawable.message,R.drawable.money,R.drawable.notebook,
7 R.drawable.rest,R.drawable.setting,R.drawable.studyhat,R.drawable.trashbox,
8 R.drawable.weightscale};
9 String[] iconname={
"calculate",
"calendar",
"clock",
"contact",
"message",
"money",
10 "notebook",
"rest",
"setting",
"studyhat",
"trashbox",
"weightscale"};
11 @Override
12 protected void onCreate(Bundle savedInstanceState) {
13 // TODO Auto-generated method stub
14 super.onCreate(savedInstanceState);
15 setContentView(R.layout.factivity);
16
17
18 datalist=
new ArrayList<Map<String,Object>>
();
19
20 gv=
(GridView) findViewById(R.id.gridView1);
21 sim_adapter=
new SimpleAdapter(
this, getdata(), R.layout.item,
new String[]{
"pic",
"text"},
new int[]{R.id.imageView1,R.id.textView1});
22 gv.setAdapter(sim_adapter);
23
24 gv.setOnItemClickListener(
this);
25 }
26
27 private List<Map<String, Object>>
getdata() {
28
29 for (
int i=
0;i<iconid.length;i++
){
30 Map<String, Object> map=
new HashMap<String, Object>
();
31 map.put(
"pic", iconid[i]);
32 map.put(
"text", iconname[i]);
33 datalist.add(map);
34 }
35
36
37 return datalist;
38
39
40 }
41
42 @Override
43 public void onItemClick(AdapterView<?> parent, View view,
int position,
long id) {
44 Toast.makeText(
this,
"我是"+
iconname[position], Toast.LENGTH_SHORT).show();
45
46 }
47
48
49
50
51 }
?
spinner
1 public class FActivity extends Activity implements OnItemSelectedListener{
2 private TextView txt;
3 private Spinner spin;
4 private List<String>
list;
5 private ArrayAdapter<String>
arr_adapter;
6 @Override
7 protected void onCreate(Bundle savedInstanceState) {
8 // TODO Auto-generated method stub
9 super.onCreate(savedInstanceState);
10 setContentView(R.layout.factivity);
11
12 txt=
(TextView) findViewById(R.id.textView1);
13 spin=
(Spinner) findViewById(R.id.spinner1);
14 list=
new ArrayList<String>
();
15 list.add(
"北京");
16 list.add(
"上海");
17 list.add(
"廣州");
18 list.add(
"深圳");
19 arr_adapter=
new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, list);
20 arr_adapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
21 spin.setAdapter(arr_adapter);
22 spin.setOnItemSelectedListener(
this);
23
24 }
25
26 @Override
27 public void onItemSelected(AdapterView<?> parent, View view,
int position,
long id) {
28 String cityname=
arr_adapter.getItem(position);
29 // String name =list.get(position);
30 txt.setText(
"我選擇居住在："+
cityname);
31
32 }
33 @Override
34 public void onNothingSelected(AdapterView<?>
parent) {
35 // TODO 自動生成的方法存根
36
37 }
38
39 }
?
轉載于:https://www.cnblogs.com/twomeng/p/9476292.html
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