radiogroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
void onCheckedChanged(RadioGroup rg, int checkedId) {
for(int i=0; i<rg.getChildCount(); i++) {
RadioButton btn = (RadioButton) rg.getChildAt(i);
if(btn.getId()==(checkedId) {
String text = btn.getText();
// do something with text
return;
}
}
}
});
ListView 内容循环显示
大家试想 假如ListView待显示的数据很庞大 从0-100 如果按照ListView默认行为 用户要找到50记录 可能要滚动很久
这显然会影响用户体验 本文的宗旨:解决这一问题
[思路]
思路很简单
1. 自定义BaseAdapter
2. 其 getCount() 返回一个固定值 比如:5 那么ListView就会只显示5个记录
3. 其 getView() 必须返回0-100记录 但需要分批显示 那如何实现呢?
定义 int index = 0; 用于记录显示当前数据的次序 用户显示下批数据 那么index++ 反之 显示以前 就index--
即: BaseAdapter 应该类似于这种形态 这仅仅是示例
public class ItemAdapter extends BaseAdapter { Activity a; String[] data = { //....... }; @Override public int getCount() { // TODO Auto-generated method stub return 5; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return position; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub TextView tv = new TextView(a); tv.setText(data[position+index*VIEW_COUNT]); return null; } }
但是 会有一些别的问题
1. 当数据已经取到最后一批 那么应该使"向下翻页"Button 反白 即:不可单击
2. 同理 若此前目标是第一批数据 "向上翻页"Button 也应该反白
不说了 这个问题 牵扯的东西太多 我也解决了一些 现释放代码 对该问题感兴趣的可以下载运行看看
仅补贴图
1. 第一页数据
2. 最后一页数据
谢谢 多提意见哦
//显示网页
Uri uri = Uri.parse("http://google.com");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//显示地图
Uri uri = Uri.parse("geo:38.899533,-77.036476");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//其他 geo URI 範例
//geo:latitude,longitude
//geo:latitude,longitude?z=zoom
//geo:0,0?q=my+street+address
//geo:0,0?q=business+near+city
//google.streetview:cbll=lat,lng&cbp=1,yaw,,pitch,zoom&mz=mapZoom
// 路径规划
Uri uri = Uri.parse("http://maps.google.com/maps?f=d&saddr=startLat%20startLng&daddr=endLat%20endLng&hl=en");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//where startLat, startLng, endLat, endLng are a long with 6 decimals like: 50.123456
//打电话
//叫出拨号程序
Uri uri = Uri.parse("tel:0800000123");
Intent it = new Intent(Intent.ACTION_DIAL, uri);
startActivity(it);
//直接打电话出去
Uri uri = Uri.parse("tel:0800000123");
Intent it = new Intent(Intent.ACTION_CALL, uri);
startActivity(it);
//用這个,要在 AndroidManifest.xml 中,加上
//<uses-permission id="android.permission.CALL_PHONE" />
//传送SMS/MMS
//调用短信程序
Intent it = new Intent(Intent.ACTION_VIEW, uri);
it.putExtra("sms_body", "The SMS text");
it.setType("vnd.android-dir/mms-sms");
startActivity(it);
//传送消息
Uri uri = Uri.parse("smsto://0800000123");
Intent it = new Intent(Intent.ACTION_SENDTO, uri);
it.putExtra("sms_body", "The SMS text");
startActivity(it);
//传送 MMS
Uri uri = Uri.parse("content://media/external/images/media/23");
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra("sms_body", "some text");
it.putExtra(Intent.EXTRA_STREAM, uri);
it.setType("image/png");
startActivity(it);
/// 传送 Email
Uri uri = Uri.parse("mailto:xxx@abc.com");
Intent it = new Intent(Intent.ACTION_SENDTO, uri);
startActivity(it);
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra(Intent.EXTRA_EMAIL, "me@abc.com");
it.putExtra(Intent.EXTRA_TEXT, "The email body text");
it.setType("text/plain");
startActivity(Intent.createChooser(it, "Choose Email Client"));
Intent it=new Intent(Intent.ACTION_SEND);
String[] tos={"me@abc.com"};
String[] ccs={"you@abc.com"};
it.putExtra(Intent.EXTRA_EMAIL, tos);
it.putExtra(Intent.EXTRA_CC, ccs);
it.putExtra(Intent.EXTRA_TEXT, "The email body text");
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
it.setType("message/rfc822");
startActivity(Intent.createChooser(it, "Choose Email Client"));
//传送附件
Intent it = new Intent(Intent.ACTION_SEND);
it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mysong.mp3");
sendIntent.setType("audio/mp3");
startActivity(Intent.createChooser(it, "Choose Email Client"));
// 播放多媒体
Uri uri = Uri.parse("file:///sdcard/song.mp3");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
it.setType("audio/mp3");
startActivity(it);
Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//Market 相关
//寻找某个应用
Uri uri = Uri.parse("market://search?q=pname:pkg_name");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//where pkg_name is the full package path for an application
//显示某个应用的相关信息
Uri uri = Uri.parse("market://details?id=app_id");
Intent it = new Intent(Intent.ACTION_VIEW, uri);
startActivity(it);
//where app_id is the application ID, find the ID
//by clicking on your application on Market home
//page, and notice the ID from the address bar
// Uninstall 应用程序
Intent it = new Intent(Intent.ACTION_DELETE, uri);
startActivity(it);