Android 线程不访问视图
我有一个填充listview的类,但它有一个错误,说明线程无法处理该视图,我想知道是否有人知道在显示列表之前放置processdialog的更好方法,谢谢Android 线程不访问视图,android,multithreading,listview,Android,Multithreading,Listview,我有一个填充listview的类,但它有一个错误,说明线程无法处理该视图,我想知道是否有人知道在显示列表之前放置processdialog的更好方法,谢谢 public class MainActivity extends ListActivity { // All static variables static final String URL = "sample.com"; // XML node keys static final String KEY_ITEM = "item"; //
public class MainActivity extends ListActivity {
// All static variables
static final String URL = "sample.com";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_ID = "id";
static final String KEY_NAME = "nome";
static final String KEY_END = "endereco";
static final String KEY_TEL = "telefone";
static final String KEY_BAI = "bairro";
private ProgressDialog progressDialog;
//private Handler handler;
ListAdapter adapter;
ListView lv;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list);
ActionBar actionBar = getActionBar();
actionBar.setTitle("Test");
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setIcon(R.drawable.icon);
//handler = new Handler();
new Thread(){
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
progressDialog = ProgressDialog.show(MainActivity.this, "", "loading...");
}
});
loadList();
progressDialog.cancel();
}
}.start();
lv = getListView();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// getting values from selected ListItem
String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
String cost = ((TextView) view.findViewById(R.id.cost)).getText().toString();
String description = ((TextView) view.findViewById(R.id.description)).getText().toString();
// Starting new intent
Intent in = new Intent(getApplicationContext(), DescriptionActivity.class);
in.putExtra("nome", ((TextView) view.findViewById(R.id.name)).getText().toString());
in.putExtra("endereco", ((TextView) view.findViewById(R.id.cost)).getText().toString());
in.putExtra("telefone", ((TextView) view.findViewById(R.id.description)).getText().toString());
startActivity(in);
}
});
}
public void loadList(){
ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_ITEM);
// looping through all item nodes <item>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(KEY_ID, parser.getValue(e, KEY_ID));
map.put(KEY_NAME, parser.getValue(e, KEY_NAME));
map.put(KEY_END, parser.getValue(e, KEY_END));
map.put(KEY_TEL, parser.getValue(e, KEY_TEL));
map.put(KEY_BAI, parser.getValue(e, KEY_BAI));
// adding HashList to ArrayList
menuItems.add(map);
}
// Adding menuItems to ListView
adapter = new SimpleAdapter(this, menuItems,
R.layout.list_row_lojas,
new String[] { KEY_NAME, KEY_END, KEY_TEL, KEY_BAI }, new int[] {
R.id.name, R.id.description, R.id.cost, R.id.bairro });
setListAdapter(adapter);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
public类MainActivity扩展了ListActivity{
//所有静态变量
静态最终字符串URL=“sample.com”;
//XML节点密钥
静态最终字符串KEY\u ITEM=“ITEM”//父节点
静态最终字符串键\u ID=“ID”;
静态最终字符串键\u NAME=“nome”;
静态最终字符串键\u END=“endereco”;
静态最终字符串键\u TEL=“telefone”;
静态最终字符串键\u BAI=“bairro”;
私有进程对话;
//私人经办人;
列表适配器;
ListView lv;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.list);
ActionBar ActionBar=getActionBar();
actionBar.setTitle(“测试”);
actionBar.setDisplayHomeAsUpEnabled(true);
actionBar.setIcon(R.drawable.icon);
//handler=新的handler();
新线程(){
公开募捐{
runOnUiThread(新的Runnable(){
@凌驾
公开募捐{
progressDialog=progressDialog.show(MainActivity.this,“,”正在加载…);
}
});
loadList();
progressDialog.cancel();
}
}.start();
lv=getListView();
lv.setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父级、视图、,
内部位置,长id){
//从选定的ListItem获取值
字符串名称=((TextView)view.findviewbyd(R.id.name)).getText().toString();
字符串成本=((TextView)view.findViewById(R.id.cost)).getText().toString();
字符串描述=((TextView)view.findViewById(R.id.description)).getText().toString();
//开始新的意图
Intent in=新的Intent(getApplicationContext(),DescriptionActivity.class);
在.putExtra(“nome”,((TextView)view.findViewById(R.id.name)).getText().toString());
在.putExtra(“endereco”,((TextView)view.findViewById(R.id.cost)).getText().toString());
在.putExtra(“telefone”,((TextView)view.findviewbyd(R.id.description)).getText().toString());
星触觉(in);
}
});
}
公共无效加载列表(){
ArrayList menuItems=新建ArrayList();
XMLParser=新的XMLParser();
字符串xml=parser.getXmlFromUrl(URL);//获取xml
Document doc=parser.getDomeElement(xml);//获取DOM元素
NodeList nl=doc.getElementsByTagName(键项);
//循环通过所有项目节点
对于(int i=0;ivalue
put(KEY_ID,parser.getValue(e,KEY_ID));
put(KEY_NAME,parser.getValue(e,KEY_NAME));
put(KEY_END,parser.getValue(e,KEY_END));
put(KEY_TEL,parser.getValue(e,KEY_TEL));
put(KEY_BAI,parser.getValue(e,KEY_BAI));
//将哈希列表添加到ArrayList
menuItems.add(地图);
}
//向ListView添加菜单项
适配器=新的SimpleAdapter(此,菜单项,
R.layout.list_row_lojas,
新字符串[]{KEY_NAME,KEY_END,KEY_TEL,KEY_BAI},new int[]{
R.id.name,R.id.description,R.id.cost,R.id.bairro});
setListAdapter(适配器);
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
开关(item.getItemId()){
案例android.R.id.home:
意向意向=新意向(此,MainActivity.class);
intent.addFlags(intent.FLAG\u ACTIVITY\u CLEAR\u TOP);
星触觉(意向);
返回true;
违约:
返回super.onOptionsItemSelected(项目);
}
}
}
04-24 23:03:50.871:E/AndroidRuntime(26159):
android.view.ViewRootImpl$CalledFromErrorThreadException:只有
创建视图层次结构的原始线程可以接触其视图
使用
而不是
runOnUiThread(new Runnable() {
@Override
public void run() {
progressDialog = ProgressDialog.show(MainActivity.this, "", "loading...");
}
});
runOnUiThread(new Runnable() {
@Override
public void run() {
progressDialog = ProgressDialog.show(MainActivity.this, "", "loading...");
}
});