Android 如何在开始新活动时放置进度条
我有两个活动A和B。我曾试图从A跳到B。现在进入BAndroid 如何在开始新活动时放置进度条,android,android-asynctask,android-activity,android-progressbar,Android,Android Asynctask,Android Activity,Android Progressbar,我有两个活动A和B。我曾试图从A跳到B。现在进入B @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.list_main); LoadData(); } 现在在LoadData（）中，我必须加载很多数据，我希望当它B启动时，它会显示一个进度条，加载数据后，它会跳回我的活动B。我该怎么
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.list_main);
LoadData();
}
LoadData（）public void LoadData(Context context)
{
String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '"
+ ("1") + "'";
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME
+ " COLLATE LOCALIZED ASC";
ContentResolver cr = getContentResolver();
// ContactsContract.Contacts.
// Cursor cur = cr.query(ContactsContract.Contacts.CONTENT_URI, null,
// null, null, ContactsContract.Contacts.DISPLAY_NAME);
// Find the ListView resource.
Cursor cur;
cur = context.getContentResolver().query(
ContactsContract.Contacts.CONTENT_URI,
null,
selection + " AND "
+ ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1",
null, sortOrder);
mainListView = (ListView) findViewById(R.id.mainListView);
// When item is tapped, toggle checked properties of CheckBox and
// Planet.
mainListView
.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
public void onItemClick(AdapterView<?> parent, View item,
int position, long id)
{
ContactsList planet = listAdapter.getItem(position);
planet.toggleChecked();
PlanetViewHolder viewHolder = (PlanetViewHolder) item
.getTag();
viewHolder.getCheckBox().setChecked(planet.isChecked());
}
});
// Create and populate planets.
planets = (ContactsList[]) getLastNonConfigurationInstance();
// planets = new Planet[10];
// planets.Add("asdf");
ArrayList<ContactsList> planetList = new ArrayList<ContactsList>();
String phoneNumber = null;
String phoneType = null;
count = cur.getCount();
contacts = new ContactsList[count];
if (planets == null)
{
if (cur.getCount() > 0)
{
planets = new ContactsList[cur.getCount()];
int i = 0;
//
while (cur.moveToNext())
{
String id = cur.getString(cur
.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur
.getString(cur
.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
if (Integer
.parseInt(cur.getString(cur
.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0)
{
// Query phone here. Covered next
Cursor pCur = cr
.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null,
ContactsContract.CommonDataKinds.Phone.CONTACT_ID
+ " = ?", new String[]
{ id }, null);
// WHILE WE HAVE CURSOR GET THE PHONE NUMERS
while (pCur.moveToNext())
{
// Do something with phones
phoneNumber = pCur
.getString(pCur
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DATA));
phoneType = pCur
.getString(pCur
.getColumnIndex(ContactsContract.CommonDataKinds.Phone.TYPE));
Log.i("Pratik", name + "'s PHONE :" + phoneNumber);
Log.i("Pratik", "PHONE TYPE :" + phoneType);
}
pCur.close();
}
if (phoneNumber != null
&& !planetList.contains(new ContactsList(name,
phoneNumber)))
{
planets = new ContactsList[]
{ new ContactsList(name, phoneNumber) };
contacts[i] = planets[0];
planetList.addAll(Arrays.asList(planets));
}
phoneNumber = null;
i++;
}
}
// for (int i = 0; i < count; i++)
// {
// Log.d("New Selected Names : ", contacts[i].getName());
// }
}
// Set our custom array adapter as the ListView's adapter.
listAdapter = new PlanetArrayAdapter(this, planetList);
mainListView.setAdapter(listAdapter);
Adapter adptr;
adptr = mainListView.getAdapter();
}
public void LoadData（上下文）
{
字符串选择=Contacts contract.Contacts.IN_VISIBLE_GROUP+“=”“
+ ("1") + "'";
字符串排序器=Contacts contract.Contacts.DISPLAY\u NAME
+“整理本地化ASC”；
ContentResolver cr=getContentResolver（）；
//联系人contract.Contacts。
//Cursor cur=cr.query（Contacts contract.Contacts.CONTENT\u URI，null，
//null，null，Contacts contract.Contacts.DISPLAY\u NAME）；
//查找ListView资源。
光标电流；
cur=context.getContentResolver（）.query(
Contacts contract.Contacts.CONTENT\u URI，
无效的
选择+“和”
+Contacts contract.Contacts.HAS_PHONE_NUMBER+“=1”，
空，排序器）；
mainListView=（ListView）findViewById（R.id.mainListView）；
//点击项目时，切换复选框和的选中属性
//行星。
主列表视图
.setOnItemClickListener（新的AdapterView.OnItemClickListener（）
{
public void onItemClick（AdapterView父项、视图项、，
内部位置，长id）
{
ContactsList planet=listAdapter.getItem（位置）；
planet.toggleChecked（）；
PlanetViewHolder=（PlanetViewHolder）项目
.getTag（）；
viewHolder.getCheckBox（）.setChecked（planet.isChecked（））；
}
});
//创建并填充行星。
planets=（ContactsList[]）GetLastNonConfiguration实例（）；
//行星=新行星[10]；
//添加（“asdf”）；
ArrayList planetList=新的ArrayList（）；
字符串phoneNumber=null；
字符串phoneType=null；
count=cur.getCount（）；
联系人=新联系人列表[计数]；
如果（行星==null）
{
如果（cur.getCount（）>0）
{
planets=新联系人列表[cur.getCount（）]；
int i=0；
//
while（cur.moveToNext（））
{
字符串id=cur.getString（cur
.getColumnIndex（Contacts contract.Contacts._ID））；
字符串名称=cur
.getString（cur）
.getColumnIndex（Contacts contract.Contacts.DISPLAY_NAME））；
if（整数
.parseInt（cur.getString（cur
.getColumnIndex（Contacts contract.Contacts.HAS_PHONE_NUMBER））>0）
{
//这里是查询电话，下一个
光标pCur=cr
.query（contacts contract.commondatatypes.Phone.CONTENT\u URI、，
无效的
Contacts contract.CommonDataTypes.Phone.CONTACT\u ID
+“=？”，新字符串[]
{id}，null）；
//当我们拿到电话号码的时候
while（pCur.moveToNext（））
{
//用手机做点什么
电话号码=pCur
.getString（pCur）
.getColumnIndex（ContactsContract.CommonDataTypes.Phone.DATA））；
电话类型=pCur
.getString（pCur）
.getColumnIndex（ContactsContract.CommonDataTypes.Phone.TYPE））；
Log.i（“Pratik”，name+”）的电话：“+电话号码）；
Log.i（“Pratik”，“电话类型：”+电话类型）；
}
pCur.close（）；
}
如果（电话号码！=空
&&！planetList.contains（新联系人列表）（名称、，
电话号码（
{
行星=新联系人列表[]
{新联系人列表（姓名、电话号码）}；
接触点[i]=行星[0]；
planetList.addAll（Arrays.asList（planets））；
}
phoneNumber=null；
i++；
}
}
//for（int i=0；ipublic class LoadData extends AsyncTask<Void, Void, Void> {
ProgressDialog progressDialog;
//declare other objects as per your need
@Override
protected void onPreExecute()
{
progressDialog= new ProgressDialog(YourActivity.this);
progressDialog.setTitle("Please Wait..");
progressDialog.setMessage("Loading");
progressDialog.setCancelable(false);
progressDialog.show();
//do initialization of required objects objects here
};
@Override
protected Void doInBackground(Void... params)
{
LoadData();
//do loading operation here
return null;
}
@Override
protected void onPostExecute(Void result)
{
super.onPostExecute(result);
progressDialog.dismiss();
};
}
public class BActivtiy extends Activity implements Runnable{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.list_main);
mainListView = (ListView) findViewById(R.id.mainListView);
mainListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View item, int position, long id) {
ContactsList planet = listAdapter.getItem(position);
planet.toggleChecked();
PlanetViewHolder viewHolder = (PlanetViewHolder) item.getTag();
viewHolder.getCheckBox().setChecked(planet.isChecked());
}
});
pd = ProgressDialog.show(BActivity.this, "Title", "Description", true);
Thread t = new Thread(BActivity.this);
t.start();
}
public void LoadData() {
String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '" + ("1") + "'";
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC";
ContentResolver cr = getContentResolver();
Cursor cur;
cur = this.getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, selection + " AND " + ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1", null, sortOrder);
// Create and populate planets.
planets = (ContactsList[]) getLastNonConfigurationInstance();
// planets = new Planet[10];
// planets.Add("asdf");
ArrayList<ContactsList> planetList = new ArrayList<ContactsList>();
String phoneNumber = null;
String phoneType = null;
count = cur.getCount();
contacts = new ContactsList[count];
if (planets == null) {
if (cur.getCount() > 0) {
planets = new ContactsList[cur.getCount()];
int i = 0;
while (cur.moveToNext()) {
String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
if (Integer.parseInt(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
// Query phone here. Covered next
Cursor pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[] { id }, null);
// WHILE WE HAVE CURSOR GET THE PHONE NUMERS
while (pCur.moveToNext()) {
// Do something with phones
phoneNumber = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DATA));
phoneType = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.TYPE));
Log.i("Pratik", name + "'s PHONE :" + phoneNumber);
Log.i("Pratik", "PHONE TYPE :" + phoneType);
}
pCur.close();
}
if (phoneNumber != null && !planetList.contains(new ContactsList(name, phoneNumber))) {
planets = new ContactsList[] { new ContactsList(name, phoneNumber) };
contacts[i] = planets[0];
planetList.addAll(Arrays.asList(planets));
}
phoneNumber = null;
i++;
}
}
// for (int i = 0; i < count; i++)
// {
// Log.d("New Selected Names : ", contacts[i].getName());
// }
}
}
@Override
public void run() {
LoadData();
mHandler.sendEmptyMessage(0);
}
public Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
pd.dismiss();
listAdapter = new PlanetArrayAdapter(BActivtiy.this, planetList);
mainListView.setAdapter(listAdapter);
Adapter adptr;
adptr = mainListView.getAdapter();
}
};
}
公共类Bactivy扩展活动实现可运行{
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
//TODO自动生成的方法存根
super.onCreate（savedInstanceState）；
setContentView（R.layout.list_main）；
mainListView=（ListVi
public class BActivtiy extends Activity implements Runnable{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.list_main);
mainListView = (ListView) findViewById(R.id.mainListView);
mainListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View item, int position, long id) {
ContactsList planet = listAdapter.getItem(position);
planet.toggleChecked();
PlanetViewHolder viewHolder = (PlanetViewHolder) item.getTag();
viewHolder.getCheckBox().setChecked(planet.isChecked());
}
});
pd = ProgressDialog.show(BActivity.this, "Title", "Description", true);
Thread t = new Thread(BActivity.this);
t.start();
}
public void LoadData() {
String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '" + ("1") + "'";
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC";
ContentResolver cr = getContentResolver();
Cursor cur;
cur = this.getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, selection + " AND " + ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1", null, sortOrder);
// Create and populate planets.
planets = (ContactsList[]) getLastNonConfigurationInstance();
// planets = new Planet[10];
// planets.Add("asdf");
ArrayList<ContactsList> planetList = new ArrayList<ContactsList>();
String phoneNumber = null;
String phoneType = null;
count = cur.getCount();
contacts = new ContactsList[count];
if (planets == null) {
if (cur.getCount() > 0) {
planets = new ContactsList[cur.getCount()];
int i = 0;
while (cur.moveToNext()) {
String id = cur.getString(cur.getColumnIndex(ContactsContract.Contacts._ID));
String name = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME));
if (Integer.parseInt(cur.getString(cur.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) > 0) {
// Query phone here. Covered next
Cursor pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[] { id }, null);
// WHILE WE HAVE CURSOR GET THE PHONE NUMERS
while (pCur.moveToNext()) {
// Do something with phones
phoneNumber = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DATA));
phoneType = pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.TYPE));
Log.i("Pratik", name + "'s PHONE :" + phoneNumber);
Log.i("Pratik", "PHONE TYPE :" + phoneType);
}
pCur.close();
}
if (phoneNumber != null && !planetList.contains(new ContactsList(name, phoneNumber))) {
planets = new ContactsList[] { new ContactsList(name, phoneNumber) };
contacts[i] = planets[0];
planetList.addAll(Arrays.asList(planets));
}
phoneNumber = null;
i++;
}
}
// for (int i = 0; i < count; i++)
// {
// Log.d("New Selected Names : ", contacts[i].getName());
// }
}
}
@Override
public void run() {
LoadData();
mHandler.sendEmptyMessage(0);
}
public Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
pd.dismiss();
listAdapter = new PlanetArrayAdapter(BActivtiy.this, planetList);
mainListView.setAdapter(listAdapter);
Adapter adptr;
adptr = mainListView.getAdapter();
}
};
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.list_main);
mDailog = ProgressDialog.show(ActivityA.this, "",
"Loading data....!!!", true);
mDailog.show();
new Thread() {
@Override
public void run() {
try {
LoadData();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
}.start();
}