manifest 
A跳转B,在B的文件中用permission权限,然后A就无权跳转到B,如果在A中用uses-permission把权限给了A,那么A就可以跳转到B了.可以通俗的说,permission给B了一把锁,A要进门,就要用uses-permission得到一把钥匙.
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", "慕课网"+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 自动生成的方法存根
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:选择器
DatePicker日历选择器
Timepicker时间选择器** 
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();//生成日历类的对象实例
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的加减一问题。
datepicker需要用init（）方法，在方法中调用监听器，而时间选择器直接调用监听器。
dialog形式 
匿名内部类实现。
1 //参数callback是监听器
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("广州");
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("我选择居住在："+cityname);
31
32 }
33 @Override
34 public void onNothingSelected(AdapterView<?> parent) {
35 // TODO 自动生成的方法存根
36
37 }
38
39 }
原文地址：https://www.cnblogs.com/twomeng/p/9476292.html
时间： 2024-08-03 05:30:51