Develop Reference

link adapter to a list view in another activity

I'm working on a posting system in an app.
What I want to do is when I press on the post icon I'll go to another Activity where I have an EditText and a Button.
When I press the button I want to get the text from the EditText and post it in the ListView of the main page or the "feed" page.
I don't seem to know how to link the array adapter to the feed so that the text appears on the ListView.
This is the code:
Main where I need to know what to do:
package com.example.ali.test1;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
public class MainActivity extends ActionBarActivity {
EditText input;
ListView list1;
ArrayAdapter<String> adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
int id2 = item.getItemId();
if (id == R.id.action_settings) {
return true;
} else if (id2 == R.id.action_cart) {
startActivity(new Intent(MainActivity.this, Post.class));
}
return super.onOptionsItemSelected(item);
}
}
This is the post activity :
package com.example.ali.test1;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import java.util.ArrayList;
public class Post extends ActionBarActivity {
ArrayAdapter<String> adapter1;
EditText input;
ListView list;
ArrayAdapter<String> adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post);
// android:id="#+id/input"
input = (EditText) findViewById(R.id.input);
// android:id="#+id/list"
adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, new ArrayList<String>());
}
// android:onClick="addToList"
public void addToList(View view) {
adapter.add(input.getText().toString());
adapter.notifyDataSetChanged();
// Clear the input
input.setText("");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_post, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
These are xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.example.ali.test1.MainActivity">
<ListView
android:id="#+id/list1"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_weight="1" />
</RelativeLayout>
post:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="com.example.ali.test1.Post">
<EditText
android:id="#+id/input"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/list" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Add to list"
android:onClick="addToList"
android:layout_below="#id/input"/>
</RelativeLayout>
Thank you!

You need to use the method startActivityForResult(new Intent(MainActivity.this, Post.class),1);
in the post activity
public void finish (View v){
String text = input.getText();
Intent intent = new Intent();
intent.putExtra("result",text);
setResult(Activity.RESULT_OK,intent);
finish();
}
and in the main activity you need to define a list for arrayAdapter and add the result to the arrayList
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) {
if(resultCode == Activity.RESULT_OK){
String result=data.getStringExtra("result");
list.add(result);
adapter.notifyDataSetChanged();
}
}
}

If the post activity is opened from the main activity - then the sensible way to do this here is to use "startActivityForResult". Your main activity should start your post activity and receive the result in
it's all here in the documentation : http://developer.android.com/training/basics/intents/result.html
You can pass the text value from the post activity back to the main activity in the extras bundle passed to onActivityResult.

Error:(44, 5) error: method does not override or implement a method from a supertype

Indefinite.java
This is my main code and there is someproblem with the code.Any help will very appreciated.
package mycompanycom.indefinite;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
public class Indefinite extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_indefinite);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_indefinite, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onClick(View view) {
Intent intent=new Intent(this,DisplayMessageActivity.class);
startActivity(intent);
}
}
This is my xml for my first project.
activity_indefinite.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context=".Indefinite">
<Button
android:id="#+id/the_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/INDEFINITE"
android:onClick="onClick"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:tint="#55ff0000"
android:src="#drawable/images"
android:layout_below="#+id/the_button"
android:layout_centerHorizontal="true"
android:layout_marginTop="85dp" />
</RelativeLayout>
This is my second activity code programmatically written
DisplayMessageActivity.java
package mycompanycom.indefinite;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
public class DisplayMessageActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
In my second activity I have written getIntent() to accept the intent.

public void onClick(View view) is part of the View.OnClickListener interface. To make your app compile you have to add implements View.OnClickListener to the definition of your class

You don't need #override here, because you already mentioned the method name in XML file itself, remove it(#override) before onClick() method and run.

Changing text in textView

I am trying to change the text in one of the textview by calling it in a function that is assigned to a button.. However it is not quite working as I hoped. I was wondering if some one could point out why isn't it working?
Here is the "MainActivity.java" file
package com.nblsoft.myapplication;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
String stri = new String("Hellow");
public void game(View view) {
TextView textv = (TextView) findViewById(R.id.textView2);
textv.setText(stri);
}
}
and the "activity_main.xml" file
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="#string/Welcome"
android:id="#+id/textView"
android:gravity="center"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="#string/lower_text"
android:id="#+id/textView2"
android:layout_below="#+id/editText"
android:layout_centerHorizontal="true"
android:layout_marginTop="34dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/editText"
android:inputType="number"
android:text="#string/guess"
android:textSize="160dp"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:onClick="game"/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ok"
android:id="#+id/button"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>

you want call game when click in EditText?! you put android:onClick="game" in EditText
if want call when click in Button you must add android:onClick="game" to your Button in activity_main.xml file like
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ok"
android:id="#+id/button"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:onClick="game" />
or you can use this in MainActivity.java instead use android:onClick="game" in xml file
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button=(Button) findViewById(R.id.button);
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
game(arg0);
}
});
}
- remove android:onClick="game" from EditText

package com.nblsoft.myapplication;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView textv = (TextView) findViewById(R.id.textView2);
String stri = new String("Hellow");
Button btn = (Button) findViewById(R.id.button);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
textv.setText(stri);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
This should be working.By the way.Don't rush into android like this...you've got to learn a few things about how it works before you can play with it.Try to check the documentation and play with all that android offers.It's actually fun.It was for me and it still is as I've got to learn a lot ,still.

you call the method game() when you click the edittext "editText", and this will change the textview. If you want to change the value of the textview by clicking button "button", i think you just need to move the game() method to the Button field:
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="ok"
android:id="#+id/button"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:onClick="game" />

How to make TextView Visibile On ButtonClick()?

I want it so that when I click a button the text will become visible.
I failed.
Please, help me
Loveandriod.java
package com.example.farjad.andriodlove;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
public class LoveAndriod extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_love_andriod);
}
public void onLoveButtonClicked(View view){
TextView.setVisibility(R.id.haikowtext);
TextView haikotext=findViewById(View.VISIBLE);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_love_andriod, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
and the activity log is below;
activity.love_andriod.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".LoveAndriod">
<TextView android:text="#string/hello_world"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/haikowtext"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="123dp"
android:visibility="invisible" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/love_button_text"
android:id="#+id/button"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="onLoveButtonClicked"/>
</RelativeLayout>
How can I sove that?
I am a beginner with Android Studio.

Try this:
TextView haikotext = (TextView)findViewById(R.id.haikowtext);
haikotext.setVisibility(View.VISIBLE);

#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_love_andriod);
TextView tv = (TextView)findViewById(R.id.haikowtext);
}
public void onLoveButtonClicked(View view){
tv.setVisibility(View.VISIBLE);
}

Displaying a button under a string message

Hello I am very new to android programming. I would like to get some help regarding displaying a button under a string message under an activity which has been newly activated. Hope someone can help me. Here is the code which I have for the class MyActivity which activates when the button app tutorial is pressed. The xml for my main activity is also there. Also the displaymessage activity class and xml is also there.
package com.example.sadi_ace.myfirstapp;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
public class MyActivity extends ActionBarActivity {
public final static String EXTRA_MESSAGE = "com.example.sadi_ace.myfirstapp.MESSAGE";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
}
/** Called when the user clicks the Send button */
public void TutorialText(View view) {
Intent intent = new Intent(this, DisplayMessageActivity.class);
String message = "This is the android tutorial, if you want to pass on the to the " +
"functions please press SKIP!";
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
// #Override
// public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.menu_my, menu);
// return true;
// }
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
XML for main activity
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#800080"
android:weightSum="1">
<Button
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="#string/button_tutorial"
android:background="#FFFFFF"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:onClick="TutorialText"
/>
</RelativeLayout>
DisplayMessageActivity class code
package com.example.sadi_ace.myfirstapp;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.TextView;
public class DisplayMessageActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
String message = intent.getStringExtra(MyActivity.EXTRA_MESSAGE);
// Create the text view
TextView textView = new TextView(this);
textView.setText(message);
// Set the text view as the activity layout
setContentView(textView);
}
// #Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_display_message, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
XML for DisplayMessageActivity class
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#800080"
android:weightSum="1">
</RelativeLayout>

Add button in your xml file activity_my like
<Button
android:id="#+id/btnskip"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
After that use this button id in "onCreate " method and assign it to some button
Button skip;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
skip=(Button)findViewById(R.id.btnskip);
//add on click listener
skip.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent = new Intent(this, DisplayMessageActivity.class);
String message = "This is the android tutorial, if you want to pass on the to the " +
"functions please press SKIP!";
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
});
}