如何在Android中将一个活动的上下文传递给另一个非活动类
你好，我想从活动中获取字符串并将其设置为另一个非活动类。请帮助我添加代码。我需要在非活动类url中设置edittext值。帮帮我如何在Android中将一个活动的上下文传递给另一个非活动类,android,android-activity,Android,Android Activity,你好，我想从活动中获取字符串并将其设置为另一个非活动类。请帮助我添加代码。我需要在非活动类url中设置edittext值。帮帮我 my activity. public class AlertForIp extends AppCompatActivity { String value; private Button mButton; final Context c = this; st
my activity.
public class AlertForIp extends AppCompatActivity {
String value;
private Button mButton;
final Context c = this;
static String urlString;
private static AlertForIp instance;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dialog);
instance = this;
final EditText input = new EditText(AlertForIp.this);
final AlertDialog.Builder alertDialog = new AlertDialog.Builder(AlertForIp.this);
//AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
/* SharedPreferences prefss = PreferenceManager.getDefaultSharedPreferences(AlertForIp.this);
final SharedPreferences.Editor editor = prefss.edit();*/
value = input.getText().toString();
// Setting Dialog Title
String urlsss="http://";
String urls=":1219/Json/Handler.ashx";
// This above url string i need to set in that class
urlString = urlsss+value+urls;
/* editor.putString("stringid", urlString); //InputString: from the EditText
editor.commit();
*/
alertDialog.setTitle("WELCOME TO RESTROSOFT");
// Setting Dialog Message
alertDialog.setMessage("ENTER YOUR IP");
//final EditText input = new EditText(this);
//alertDialog.setView(input);
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
input.setLayoutParams(lp);
//input.setText("http://");
InputFilter[] filters = new InputFilter[1];
filters[0] = new InputFilter() {
@Override
public CharSequence filter(CharSequence source, int start, int end,
android.text.Spanned dest, int dstart, int dend) {
if (end > start) {
String destTxt = dest.toString();
String resultingTxt = destTxt.substring(0, dstart)
+ source.subSequence(start, end)
+ destTxt.substring(dend);
if (!resultingTxt
.matches("^\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3})?)?)?)?)?)?")) {
return "";
} else {
String[] splits = resultingTxt.split("\\.");
for (int i = 0; i < splits.length; i++) {
if (Integer.valueOf(splits[i]) > 255) {
Toast.makeText(AlertForIp.this, "Please enter valid ip", Toast.LENGTH_SHORT).show();
return "";
}
}
}
}
return null;
}
};
input.setFilters(filters);
//input.setText(ip);
alertDialog.setView(input); //
// Setting Icon to Dialog
alertDialog.setIcon(R.drawable.waiting);
// Setting Positive "Yes" Button
alertDialog.setPositiveButton("YES",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
/*if(input.getText().length()==0)
{
input.setError("Field cannot be left blank.");
dialog.dismiss();
}*/
String validation="^\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3})?)?)?)?";
if (value.matches(validation))
{
Toast.makeText(getApplicationContext(),"enter valid IP address",Toast.LENGTH_SHORT).show();
Intent inten = new Intent(AlertForIp.this, AlertForIp.class);
startActivity(inten);
// or
}
else if(!input.getText().toString().equals(""))
{
Intent intent = new Intent(AlertForIp.this, Sample.class);
startActivity(intent);
//Toast.makeText(AlertDialogForIp.this, "Input Text Is Empty.. Please Enter Some Text", Toast.LENGTH_SHORT).show();
}
else
{
Intent inten = new Intent(AlertForIp.this, AlertForIp.class);
startActivity(inten);
Toast.makeText(AlertForIp.this, "Input Text Is Empty.. Please Enter Some Text", Toast.LENGTH_SHORT).show();
}
}
});
// Setting Negative "NO" Button
alertDialog.setNegativeButton("NO",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// Write your code here to execute after dialog
//dialog.cancel();
finish();
}
});
// closed
// Showing Alert Message
alertDialog.show();
}
public static Context getContext() {
RestAPI rss=new RestAPI();
rss.persistItems(urlString);
return instance.getApplicationContext();
}
}
public class RestAPI {
String urlString;
//String data;
public void persistItems(String info) {
Context context = AlertForIp.getContext();
/* SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
data = prefs.getString("stringid", "no id");*/
urlString=info;
}
//private final String urlString = "http://10.0.2.2:1219/Json/Handler.ashx";
private static String convertStreamToUTF8String(InputStream stream) throws IOException {
String result = "";
StringBuilder sb = new StringBuilder();
try {
InputStreamReader reader = new InputStreamReader(stream, "UTF-8");
char[] buffer = new char[4096];
int readedChars = 0;
while (readedChars != -1) {
readedChars = reader.read(buffer);
if (readedChars > 0)
sb.append(buffer, 0, readedChars);
}
result = sb.toString();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return result;
}
private String load(String contents) throws IOException {
//i want to add that urlstring here;
URL url = new URL(urlString);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setConnectTimeout(60000);
conn.setDoOutput(true);
conn.setDoInput(true);
OutputStreamWriter w = new OutputStreamWriter(conn.getOutputStream());
w.write(contents);
w.flush();
InputStream istream = conn.getInputStream();
String result = convertStreamToUTF8String(istream);
return result;
}
private Object mapObject(Object o) {
Object finalValue = null;
if (o.getClass() == String.class) {
finalValue = o;
} else if (Number.class.isInstance(o)) {
finalValue = String.valueOf(o);
} else if (Date.class.isInstance(o)) {
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss", new Locale("en", "USA"));
finalValue = sdf.format((Date) o);
} else if (Collection.class.isInstance(o)) {
Collection<?> col = (Collection<?>) o;
JSONArray jarray = new JSONArray();
for (Object item : col) {
jarray.put(mapObject(item));
}
finalValue = jarray;
} else {
Map<String, Object> map = new HashMap<String, Object>();
Method[] methods = o.getClass().getMethods();
for (Method method : methods) {
if (method.getDeclaringClass() == o.getClass()
&& method.getModifiers() == Modifier.PUBLIC
&& method.getName().startsWith("get")) {
String key = method.getName().substring(3);
try {
Object obj = method.invoke(o, null);
Object value = mapObject(obj);
map.put(key, value);
finalValue = new JSONObject(map);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
return finalValue;
}
public JSONObject CreateNewAccount(String User_Name, String Password) throws Exception {
JSONObject result = null;
JSONObject o = new JSONObject();
JSONObject p = new JSONObject();
o.put("interface", "RestAPI");
o.put("method", "CreateNewAccount");
p.put("User_Name", mapObject(User_Name));
p.put("Password", mapObject(Password));
o.put("parameters", p);
String s = o.toString();
String r = load(s);
result = new JSONObject(r);
return result;
}
public class UserDetailsActivity extends Activity {
TextView tvFisrtName, tvLastName;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_user_details);
// Show the Up button in the action bar.
//setupActionBar();
tvFisrtName=(TextView)findViewById(R.id.tv_firstname);
tvLastName=(TextView)findViewById(R.id.tv_lastname);
Intent i=getIntent();
String username=i.getStringExtra("User_Name");
new AsyncUserDetails().execute(username);
}
/**
* Set up the {@link android.app.ActionBar}, if the API is available.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setupActionBar() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
//getActionBar().setDisplayHomeAsUpEnabled(true);
}
}
protected class AsyncUserDetails extends AsyncTask<String,Void,JSONObject>
{
String str1;
@Override
protected JSONObject doInBackground(String... params) {
// TODO Auto-generated method stub
JSONObject jsonObj = null;
//here i have error
RestAPI api = new RestAPI();
try {
jsonObj = api.GetUserDetails(params[0]);
//JSONParser parser = new JSONParser();
//userDetail = parser.parseUserDetails(jsonObj);
} catch (Exception e) {
// TODO Auto-generated catch block
Log.d("AsyncUserDetails", e.getMessage());
}
return jsonObj;
}
@Override
protected void onPostExecute(JSONObject result) {
// TODO Auto-generated method stub
try {
JSONObject jsonObj=result.getJSONArray("Value").getJSONObject(0);
str1=jsonObj.getString("user_id").toString();
} catch (JSONException e) {
e.printStackTrace();
}
Toast.makeText(UserDetailsActivity.this, str1, Toast.LENGTH_SHORT).show();
tvFisrtName.setText(str1);
}
}
private Object mapObject(Object o) {
Object finalValue = null;
if (o.getClass() == String.class) {
finalValue = o;
} else if (Number.class.isInstance(o)) {
finalValue = String.valueOf(o);
} else if (Date.class.isInstance(o)) {
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss", new Locale("en", "USA"));
finalValue = sdf.format((Date) o);
} else if (Collection.class.isInstance(o)) {
Collection<?> col = (Collection<?>) o;
JSONArray jarray = new JSONArray();
for (Object item : col) {
jarray.put(mapObject(item));
}
finalValue = jarray;
} else {
Map<String, Object> map = new HashMap<String, Object>();
Method[] methods = o.getClass().getMethods();
for (Method method : methods) {
if (method.getDeclaringClass() == o.getClass()
&& method.getModifiers() == Modifier.PUBLIC
&& method.getName().startsWith("get")) {
String key = method.getName().substring(3);
try {
Object obj = method.invoke(o, null);
Object value = mapObject(obj);
map.put(key, value);
finalValue = new JSONObject(map);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
return finalValue;
}
public JSONObject CreateNewAccount(String User_Name, String Password) throws Exception {
JSONObject result = null;
JSONObject o = new JSONObject();
JSONObject p = new JSONObject();
o.put("interface", "RestAPI");
o.put("method", "CreateNewAccount");
p.put("User_Name", mapObject(User_Name));
p.put("Password", mapObject(Password));
o.put("parameters", p);
String s = o.toString();
String r = load(s);
result = new JSONObject(r);
return result;
}
你能把评论放在你想访问的地方并使用textview和urlyes吗请检查我是否添加了评论。在urlstring附近的活动中，它在RestApi类中设置。请帮助我解决您的问题。我添加了此代码，但它在主活动中给出了错误，我在另一个活动中访问了RestApi。我添加了代码，并在那里注释我获取了errorRestAPI api=new RestAPIurlString；不工作我在另一个函数RestAPI api=new RestAPIurlString中传递了硬编码字符串；
private Object mapObject(Object o) {
Object finalValue = null;
if (o.getClass() == String.class) {
finalValue = o;
} else if (Number.class.isInstance(o)) {
finalValue = String.valueOf(o);
} else if (Date.class.isInstance(o)) {
SimpleDateFormat sdf = new SimpleDateFormat("MM/dd/yyyy hh:mm:ss", new Locale("en", "USA"));
finalValue = sdf.format((Date) o);
} else if (Collection.class.isInstance(o)) {
Collection<?> col = (Collection<?>) o;
JSONArray jarray = new JSONArray();
for (Object item : col) {
jarray.put(mapObject(item));
}
finalValue = jarray;
} else {
Map<String, Object> map = new HashMap<String, Object>();
Method[] methods = o.getClass().getMethods();
for (Method method : methods) {
if (method.getDeclaringClass() == o.getClass()
&& method.getModifiers() == Modifier.PUBLIC
&& method.getName().startsWith("get")) {
String key = method.getName().substring(3);
try {
Object obj = method.invoke(o, null);
Object value = mapObject(obj);
map.put(key, value);
finalValue = new JSONObject(map);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
return finalValue;
}
public JSONObject CreateNewAccount(String User_Name, String Password) throws Exception {
JSONObject result = null;
JSONObject o = new JSONObject();
JSONObject p = new JSONObject();
o.put("interface", "RestAPI");
o.put("method", "CreateNewAccount");
p.put("User_Name", mapObject(User_Name));
p.put("Password", mapObject(Password));
o.put("parameters", p);
String s = o.toString();
String r = load(s);
result = new JSONObject(r);
return result;
}
RestAPI rss=new RestAPI(urlString );