关于android4.0以上版本连接webseivice时。报空指针获取不到数据问题。大家都有什么心得，或者大家都是怎么处理的？
我试过两种方式。1.在 super.onCreate(savedInstanceState);前加入。
StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
.detectDiskReads()
.detectDiskWrites()
.detectNetwork() // or .detectAll() for all detectable problems
.penaltyLog()
.build());
StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
.detectLeakedSqlLiteObjects()
.penaltyLog()
.penaltyDeath()
.build());
第二种，新建线程用handler接受线程得到的值。这两种方法在写好吗查询时都行的通。
但是当我写查询天气的时候，就报错了，。。百思不得我解。
多线程
指针
Android 4.0
webseivce
--------------------编程问答--------------------
贴上一部分代码：/** 选择城市框 **/
private void Show_chooseCityDialog(int CityID) {
switch (CityID) {
case CITY:
// 取得city_layout.xml...中的图片
final View view = LayoutInflater.from(this).inflate(R.layout.city_layout, null);
provinces_spinner = (Spinner) view.findViewById(R.id.province_spinner);
citys_spinner = (Spinner) view.findViewById(R.id.city_spinner);
// 获取省份。。。
try {
provinces = GetweatherMessage.getProvinceList();
ArrayAdapter adapter =
new ArrayAdapter(this, android.R.layout.simple_spinner_item,
provinces);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
provinces_spinner.setAdapter(adapter);
} catch (Exception e) {
// TODO Auto-generated catch block
Toast.makeText(getApplicationContext(), "您的网络连接错误", Toast.LENGTH_SHORT)
.show();
}
// 省份Splnner监听器
provinces_spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
try {
citysname = GetweatherMessage.getCityListByProvince(provinces.get(position));
ArrayAdapter adapter2 =
new ArrayAdapter(Menu_mainActivity.this,
android.R.layout.simple_spinner_item, citysname);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
citys_spinner.setAdapter(adapter2);
} catch (Exception e) {
Toast.makeText(getApplicationContext(), "您的网络连接错误", Toast.LENGTH_SHORT)
.show();
}
}
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
// 监听城市的Sqinner
citys_spinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
mylocation = citysname.get(position);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
/** 显示城市选择对话框。。。 */
AlertDialog.Builder chooserdialog = new AlertDialog.Builder(this);
chooserdialog.setTitle("请选择城市");
chooserdialog.setView(view);
chooserdialog.setIcon(android.R.drawable.ic_menu_info_details);
chooserdialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
location.setText(mylocation);
refresh(mylocation);
}
});
chooserdialog.setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
chooserdialog.show();
break;
}
}
补充：移动开发 , Android
