In android studio I have two activities, Main and Settings.
The settings activity is called from main activity and there is a button for logging out. When I click on this button the settings activity finishes and the main activity appears again. How can I make the main activity know that the log out button was clicked?
And what if there is many actions that I can perform in settings activity?I don't want to return result to main activity, I want to write that actions somewhere and read from there in Main activity.
In the MainActivity you can start the SettingActivity using
Intent intent = new Intent(this, SettingActivity .class);
startActivityForResult(intent, yourRequestCode);
after that in SettingActivity when you click the button logout, parse the boolean using
Intent intent= new Intent();
intent.putExtra("isClicked", true); // save clicked data
setResult(Activity.RESULT_OK, intent);
finish();
then, in MainActivity you can call onActivityResult like this
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK && requestCode == yourRequestCode) {
Boolean isLogoutClicked = data.getExtras().getBoolean("isClicked");
}
now you get the data from the setting activity when the button logout is clicked.
in mainActivity
Intent intent = new Intent(this, SettingActivity .class);
startActivityForResult(intent, 123);
than
#Override
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
try {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 123 && resultCode == RESULT_OK)
{
String requiredValue = data.getStringExtra("key");
}
} catch (Exception ex) {
Toast.makeText(Activity.this, ex.toString(),
Toast.LENGTH_SHORT).show();
}
}
and set thus into your setting screen
Intent intent = getIntent();
intent.putExtra("key", value);
setResult(RESULT_OK, intent);
finish();
and check if value have data or anything you past that its come from setting screen
Related
I have two activities. The second activity is called from the first using startActivityForResult(intent,request_code).
In the second activity I have this code:
Intent i = getIntent();
i.putExtra("data" , some data);
setResult(Activity.RESULT_OK,i);
finish();
Then, to get the data in the first activity I use this code:
#Override
protected void onActivityResult(int requestCode,int resultCode,Intent intent)
{
super.onActivityResult(requestCode, resultCode, data);
if (requestCode==this.uploadRequestCode && resultCode == Activity.RESULT_OK)
{
data = intent.get("data")
}
I start the activity this way:
Intent uploadIntent = new Intent(this,uploadActivity.class)
startActivityForResult(uploadIntent,this.uploadRequestCode)
The problem is that the result code I get is RESULT_CANCELLED even though I set RESULT_OK.
NOTE
I am not talking about a situation when back button is pressed.
UPDATE
I found out that the intent I get in onActivityResult() is null even though I sent an intent, that's why the result code was RESULT_CANCELLED.
Anyone knows why the intent is null?
Maybe this can help you out, something from a project that I have
This how I do start my activity
Intent intent = new Intent(FirstActivity.this, ActivityThatReturnInfo.class);
startActivityForResult(intent, 1);
This is from the activity that I want to return some value
Intent returnIntent = new Intent();
returnIntent.putExtra("VAR",someInfo);
setResult(Activity.RESULT_OK,returnIntent);
finish();
This is on the activity that as started the one that is waiting for the information
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
switch (requestCode)
{
case 1:
if(resultCode == Activity.RESULT_OK)
{
String result = data.getStringExtra("VAR");
// Code to do
}
break;
default:
IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
if(result != null)
{
if(result.getContents() != null)
{
// Code to do
}
}
break;
}
}
Starting SecondActivity from FirstActivity
Intent i = new Intent(this, SecondActivity.class);
startActivityForResult(i, 100);
Sending data to FirstActivity from SecondActivity
Intent intent= new Intent();
intent.putExtra("result",result);
setResult(RESULT_OK,intent);
finish();
getting result in FirstActivity
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == 100 && resultCode == Activity.RESULT_OK){
String result=data.getStringExtra("result");
Log.e("Result",result);
}
}
Edit:
Change your code to below and try once.
While sending intent from SecondActivity to FirstActivity Intent i = getIntent(); to Intent intent= new Intent();
I have two activities profile_Activity and Edit_Profile_activity when I am moving from Profile_Activity to Edit_Profile_activity and doing some changes on profile and update the profile, Activity updates successfully but updated values are not shown on profile_Activity when the back button of mobile is pressed. also the value is shown on press UpEnabled button.
start activity by using
Intent intent = new Intent(mActivity, Edit_Profile_activity.class);
startActivityForResult(intent, REQUEST_CODE);
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case REQUEST_CODE:
if (resultCode == Activity.RESULT_OK && data!=null) {
String abc=data.getStringExtra("data_key") ;
//write your code for update info
}
break;
}
}
In your Edit_Profile_activity return result by using
Intent intent=new Intent();
intent.putExtra("data_key",value);
setResult(Activity.RESULT_OK, intent);
finish();
I am trying to pass data backwards to an activity, however I can never get my onActivityResult function to be called. When I start the new activity, I create a new intent like regular
Intent intent = new Intent(this, NewLoanCost.class);
intent.putExtra("defaultsArray", jDefaultsArray.toString());
intent.putExtra("loanSelection", loanSelection);
intent.putExtra("buyerSellerSelection", buyerSellerSelection);
startActivity(intent);
and when I want to go back to the previous activity, I am overriding the back button to create a new intent and store the data
#Override
public void onBackPressed() {
Intent intent = new Intent();
intent.putExtra("fullCosts", fullCosts.toString());
setResult(RESULT_OK, intent);
super.onBackPressed();
}
but in the first activity, I can't even get a debugging toast to appear. Am I missing something blatant?
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
//super.onActivityResult(requestCode, resultCode, data);
Toast.makeText(this, "onActivityResult", Toast.LENGTH_SHORT).show();
if (requestCode == 1) {
if(resultCode == RESULT_OK){
try {
jDefaultsArray = new JSONArray(data.getStringExtra("fullCosts"));
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
To receive a result you should use startActivityForResult instead of startActivity
Change your code to
Intent intent = new Intent(this, NewLoanCost.class);
intent.putExtra("defaultsArray", jDefaultsArray.toString());
intent.putExtra("loanSelection", loanSelection);
intent.putExtra("buyerSellerSelection", buyerSellerSelection);
startActivityForResult(intent, 1);
the second parameter is an int with the request code you will use in onActivityResult
Use startActivityForResult.
Replace your code with this, then it should work:
Intent intent = new Intent(this, NewLoanCost.class);
intent.putExtra("defaultsArray", jDefaultsArray.toString());
intent.putExtra("loanSelection", loanSelection);
intent.putExtra("buyerSellerSelection", buyerSellerSelection);
startActivityForResult(intent);
I have two activities "A" and "B".
In my "A" activity I use startActivityForResult:
Intent i = new Intent(A.this, B.class);
setResult(RESULT_OK, i);
startActivityForResult(i, 121245);
finish();
This is the code of my "B" activity:
#Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
Toast.makeText(B.this, "onActivityResult", Toast.LENGTH_SHORT).show();
if(requestCode == 121245) {
if (resultCode == RESULT_OK)
//make something
}
}
Why my Toast doesn't show?
onActivityResult will be called on the activity which is starting the activity for result, meaning calls the startActivityForResult method
What that means is if you want to be notified when the B activity finishes in A activity, you would first in A activity start the B activity like you did in your example code
Intent i = new Intent(A.this, B.class);
setResult(RESULT_OK, i);
startActivityForResult(i, 121245);
then when B activity finishes A activity's onActivityResultis called and there you can do whatever you want.
Here's a diagram if it helps you understand the flow of the application
You have a little mistake
at A class should be:
Intent i = new Intent(A.this, B.class);
startActivityForResult(i, 121245);
at B class to return:
Intent i = new Intent();
setResult(RESULT_OK, i);
finish();
and handle it at A
#Override
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
Toast.makeText(B.this, "onActivityResult", Toast.LENGTH_SHORT).show();
if(requestCode == 121245) {
if (resultCode == RESULT_OK)
//make something
}
}
onActivityResult()
must be the part of your A activity, Your B activity will return some data back to A and then onActivityResult() will be called.
Here is my first activity code from where I call the second Activity:
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_DPAD_LEFT){
startActivityForResult(new Intent("chap.two.Chapter2Activity2"),request_Code);
}
return false;
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == request_Code) {
if (resultCode == RESULT_OK)
Toast.makeText(this,data.getData().toString(),Toast.LENGTH_SHORT).show();
}
}
And here is a code of chap.two.Chapter2Activity2:
Button n = (Button) findViewById(R.id.btn_OK);
n.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent data = new Intent();
//---get the EditText view---
EditText txt_username =(EditText) findViewById(R.id.txt_username);
//---set the data to pass back---
data.setData(Uri.parse(txt_username.getText().toString()));
setResult(RESULT_OK, data);
//---closes the activity---
finish();
}
});
here I see that setResult(RESULT_OK, data) has two arguments but
onActivityResult(int requestCode, int resultCode, Intent data) has three and I want know how onActivityResult gets value for third parameter? How it works can anyone tell me? Why isn't this error ?
When you call Activity.startActivityForResult(), you set the requestCode. Later, this request code is needed by onActivityResult() in order to determine what Activity is sending data to it. We don't need to supply requestCode again on setResult() because the requestCode is carried along.
The data is intent data returned from launched intent. We usually use this data when we set extras on the called intent.
Consider this example:
CALL SECOND ACTIVITY
Intent i = new Intent(MainActivity.this, CheckActivity.class);
startActivityForResult(i, REQUEST_CODE_CHECK);
ON SECOND ACTIVITY, SET INTENT RESULT
getIntent().putExtra("TADA", "bla bla bla");
setResult(RESULT_OK, getIntent());
finish();
BACK TO FIRST ACTIVITY, ONACTIVITYRESULT()
if(requestCode == REQUEST_CODE_CHECK && resultCode == RESULT_OK){
text1.setText(data.getExtras().getString("TADA") );
}
There you go. You should now understand what is Intent data and how to set and fetch the value.
Third parameter is Intent, which you sent from the sub-Activity(Second Activity, which is going to finish).
If you want to perform some calculations or fetch some username/password in sub-activity and you want to send the result to the main activity, then you place the data in the intent and will return to the Main activity before finish().
After that you will check in onActivityResult(int, int, Intent) in main activity for the result with Intent parameter.
Example::
MainActivity:
public void onClick(View view) {
Intent i = new Intent(this, subActivity.class);
startActivityForResult(i, REQUEST_CODE);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK && requestCode == REQUEST_CODE) {
if (data.hasExtra("username") && data.hasExtra("password")) {
String username = data.getExtras().getString("username");
String password = data.getExtras().getString("password");
}
}
subActivity::
#Override
public void finish() {
// Create one data intent
Intent data = new Intent();
data.putExtra("username", "Bla bla bla..");
data.putExtra("password", "*****");
setResult(RESULT_OK, data);
super.finish();
}