我有一个tabhost布局。如果用户不选择选项卡1中的列表项，则用户不应导航到选项卡2.如果他尝试导航到选项卡2，则应在选项卡1上显示警告，说明选择选项卡1中的列表项
请帮忙。
感谢
tab.class
package hello.com.navigationdrawer;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.app.TabActivity;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.TextView;
public class Tab extends TabActivity{
/** Called when the activity is first created. */
TabHost tabHost;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab_new);
TabHost tabHost = getTabHost();
TabHost.TabSpec spec;
//home
this.setNewTab(this, tabHost, "tab1", R.string.homestr,R.drawable.hom, Home.class);
this.setNewTab(this, tabHost, "tab2", R.string.planstr,R.drawable.plan, Planning.class);
this.setNewTab(this, tabHost, "tab3", R.string.repstr,R.drawable.dash,Reports.class);
this.setNewTab(this, tabHost, "tab3", R.string.searstr,R.drawable.sear, Search.class);
}
private void setNewTab(Context context, TabHost tabHost, String tag, int title, int icon, Class content){
Intent intent;
TabHost.TabSpec tabSpec;
if(tag!="tab2"){
tabSpec = tabHost.newTabSpec(tag);
tabSpec.setIndicator(getTabIndicator(tabHost.getContext(), title, icon)); // new function to inject our own tab layout
/*intent = new Intent().setClass(context,content).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);*/
intent = new Intent().setClass(context,content);
tabSpec.setContent(intent);
tabHost.addTab(tabSpec);}
else{
tabSpec = tabHost.newTabSpec(tag);
tabSpec.setIndicator(getTabIndicator(tabHost.getContext(), title, icon)); // new function to inject our own tab layout
intent = new Intent().setClass(context,content).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
/* intent = new Intent().setClass(context,content);*/
tabSpec.setContent(intent);
tabHost.addTab(tabSpec);
}
Bundle extras = getIntent().getExtras();
if(extras !=null) {
String value = extras.getString("tab_index");
if(value.equals("1")){
tabHost.setCurrentTab(Integer.valueOf(value));
}
/* if(value.equals("2")){
tabSpec.setIndicator(getTabIndicator(tabHost.getContext(), title, icon)); // new function to inject our own tab layout
intent = new Intent().setClass(context,content).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
*//* intent = new Intent().setClass(context,content);*//*
tabSpec.setContent(intent);
tabHost.addTab(tabSpec);
}*/
}
}
private View getTabIndicator(Context context, int title, int icon) {
View view = LayoutInflater.from(context).inflate(R.layout.tab_activity, null);
ImageView iv = (ImageView) view.findViewById(R.id.imageView);
iv.setImageResource(icon);
TextView tv = (TextView) view.findViewById(R.id.oppercent);
tv.setText(title);
tv.setTextColor(getResources().getColorStateList(R.color.tab_txtcolor));
return view;
}
}
Home.class（这是标签1）这是列表所在的标签需要在此活动中显示警告框
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
loggedUser=(TextView) findViewById(R.id.loggeduser);
/* loggedUser.setText("Welcome:"+" "+Login.login_user.replace("_"," "));*/
loggedUser.setVisibility(View.INVISIBLE);
prolistlabel=(TextView)findViewById(R.id.prolistlabel);
projects=(ListView) findViewById(R.id.homelist);
prolistlabel.setVisibility(View.INVISIBLE);
projects.setVisibility(View.INVISIBLE);
home_view=(View) findViewById(R.id.homeview);
home_view.setVisibility(View.INVISIBLE);
/*requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setProgressBarIndeterminateVisibility(true);*/
linlaHeaderProgress=(ProgressBar) findViewById(R.id.homeprogress);
if (android.os.Build.VERSION.SDK_INT > 9) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
}
logout=(ImageButton)findViewById(R.id.logout_home);
logout.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(Home.this,Login.class));
overridePendingTransition(R.anim.left_right,R.anim.right_left);
}
});
sp=getSharedPreferences(preference, Context.MODE_PRIVATE);
new ProgressSpin().execute();
}
public String webServiceCall() throws Exception {
URL obj=new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
// optional default is GET
con.setRequestMethod("GET");
String uname=Login.login_user;
String pswd=Login.login_pswd;
String Authentication=uname+":"+pswd;
try {
byte[] data = Authentication.getBytes("UTF-8");
authorisation = Base64.encodeToString(data, Base64.DEFAULT);
System.out.println("authorisation value"+ authorisation);
}
catch(Exception ae){
ae.printStackTrace();
}
//add request header
con.setRequestProperty("authorisation",authorisation);
int responseCode = con.getResponseCode();
System.out.println("\nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " + responseCode);
BufferedReader in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
resp=response.toString();
//print result
System.out.println("JSON response"+resp);
return resp;
}
public String webservice_call_displayname() throws Exception {
URL obj=new URL(display_name_url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
// optional default is GET
con.setRequestMethod("GET");
String uname=Login.login_user;
String pswd=Login.login_pswd;
String Authentication=uname+":"+pswd;
try {
byte[] data = Authentication.getBytes("UTF-8");
authorisation = Base64.encodeToString(data, Base64.DEFAULT);
System.out.println("authorisation value"+ authorisation);
}
catch(Exception ae){
ae.printStackTrace();
}
//add request header
con.setRequestProperty("authorisation",authorisation);
int responseCode = con.getResponseCode();
System.out.println("\nSending 'GET' request to URL : " + url);
System.out.println("Response Code : " + responseCode);
BufferedReader in = new BufferedReader(
new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
name_resp=response.toString();
//print result
System.out.println("JSON response"+resp);
return name_resp;
}
public void display_name(String resp){
try{
JSONObject mainobj=new JSONObject(resp);
if(mainobj!=null){
login_user=mainobj.getString("displayName");
loggedUser.setText(" "+"Welcome:"+" "+login_user);
}
}
catch(Exception e){
}
}
public String resp(String resp){
String listid;
adapter=new ArrayAdapter<String>(this,R.layout.listitem,R.id.txt_lan);
try {
final JSONArray array = new JSONArray(resp);
for(int i=0; i<array.length(); i++) {
JSONObject jsonObj = array.getJSONObject(i);
name=jsonObj.getString("name");
adapter.add(name);
projects.setAdapter(adapter);
projects.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
System.out.println("name"+name);
System.out.println("Array length"+ array.length());
projects.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
view.setSelected(true);
TextView txt=(TextView)view.findViewById(R.id.txt_lan);
String selectedItem=txt.getText().toString();
/*String selectedItem=((TextView)view).getText().toString();*/
if(selectedItems.contains(selectedItem)){
selectedItems.remove(selectedItem);
}
else
selectedItems.add(selectedItem);
System.out.println("list view item to be saved is" +selectedItem);
System.out.println("list id to be saved is" +position);
try {
System.out.println("Item form the array" +array.getJSONObject(position).getString("id"));
SharedPreferences.Editor editor = sp.edit();
editor.putString(saveIt, selectedItem);
editor.putString(savePass,array.getJSONObject(position).getString("id"));
editor.putString(projKey,array.getJSONObject(position).getString("key"));
editor.commit();
if(sp.contains(saveIt) && sp.contains(savePass)){
saved_project_name=sp.getString(saveIt, "");
savedid=sp.getString(savePass, "");
savedproid=sp.getString(projKey, "");
System.out.println("saved value"+ saved_project_name);
System.out.println("saved value"+savedid);
System.out.println("saved project key value"+ savedproid);
}
((TabActivity) getParent()).getTabHost().setCurrentTab(1);
/*
finish();
startActivity(getIntent());*/
}
catch(JSONException ae){
ae.printStackTrace();
}
}
});
}
}
catch(JSONException e){
// get the name from data.
}
return name;
}
private class ProgressSpin extends AsyncTask<String,Integer,Void> {
@Override
protected void onPreExecute() {
// SHOW THE SPINNER WHILE LOADING FEEDS
linlaHeaderProgress.setVisibility(View.VISIBLE);
}
@Override
protected Void doInBackground(String... params) {
try {
json_displayname=webservice_call_displayname();
Jsonresp= webServiceCall();}catch(Exception ae){
ae.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
resp(Jsonresp);
display_name(json_displayname);
linlaHeaderProgress.setVisibility(View.GONE);
prolistlabel.setVisibility(View.VISIBLE);
home_view.setVisibility(View.VISIBLE);
projects.setVisibility(View.VISIBLE);
loggedUser.setVisibility(View.VISIBLE);
}
}
}
答案 0 :(得分：1)
如果您使用的是viewPager，请使用此
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setPositiveButton(R.string.fire, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
viewPager.setCurrentItem(2); //Second Tab Position
}
})
// Create the AlertDialog object and return it
return builder.create();
}
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
更改此部分代码
Bundle extras = getIntent().getExtras();
if(extras !=null) {
String value = extras.getString("tab_index");
if(value.equals("1")){
tabHost.setCurrentTab(Integer.valueOf(value));
}
到此代码
Bundle extras = getIntent().getExtras();
if(extras !=null) {
String value = extras.getString("tab_index");
if(value.equals("1")){
tabHost.setCurrentTab(Integer.valueOf(value));
}else{
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
tabHost.setCurrentTab(Integer.valueOf(value));
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
});
// Create the AlertDialog object and return it
return builder.create();
}
}