Can't resolve symbol. Validates resource references inside Android XML files - android

I get an error on android:id="#id/question_text_view" located under TextView. How do I go about fixing this?
Here is code for activity_quiz.xml (Note, I took out the code for the buttons to save space.)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="24dp"
android:id="#id/question_text_view"
/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
</LinearLayout>
</LinearLayout>
Here is code for QuizActivity.java
package com.bignerdranch.android.geoquiz;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class QuizActivity extends AppCompatActivity {
private Button mTrueButton;
private Button mFalseButton;
private Button mNextButton;
private TextView mQuestionTextView;
private Question[] mQuestionBank = new Question[]{
new Question(R.string.question_oceans, true),
new Question(R.string.question_mideast, false),
new Question(R.string.question_africa, false),
new Question(R.string.question_americas, false),
new Question(R.string.question_asia, true),
};
private int mCurrentIndex = 0;
public QuizActivity() {
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
mQuestionTextView = (TextView) findViewById(R.id.question_text_view);
int question = mQuestionBank[mCurrentIndex].getTextResId();
mQuestionTextView.setText(question);
mTrueButton = (Button) findViewById(R.id.true_button);
mTrueButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(QuizActivity.this,
R.string.incorrect_toast,
Toast.LENGTH_SHORT).show();
}
});
mFalseButton = (Button) findViewById(R.id.false_button);
mFalseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(QuizActivity.this,
R.string.correct_toast,
Toast.LENGTH_SHORT).show();
}
});
}
}

Use android:id="#+id/question_text_view" instead of android:id="#id/question_text_view".
Add "+" near "#"

Related

change the text in another activity

I have a button in Activity A, which changes the text in it when clicked. There is an Activity B in which I need the TextView to become visible and its text to be the same as the text in the button on the Activity A. Please help.
Activity A
package com.example.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import androidx.annotation.Nullable;
public class SmActivity extends Activity {
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sm);
Button btn_apple = (Button) findViewById(R.id.button_apple);
Button btn_cherry = (Button) findViewById(R.id.button_cherry);
Button btn_orange = (Button) findViewById(R.id.button_orange);
Button btn_waterLemon = (Button) findViewById(R.id.button_waterlemon);
View.OnClickListener appleListener = new View.OnClickListener() {
boolean action = false;
#Override
public void onClick(View v) {
if (!action) {
action = true;
btn_apple.setText("1");
}
else {
int i = Integer.parseInt(btn_apple.getText().toString());
btn_apple.setText(String.valueOf(i + 1));
i = i;
}
}
};
View.OnClickListener cherryListener = new View.OnClickListener() {
boolean action = false;
#Override
public void onClick(View v) {
if (!action) {
action = true;
btn_cherry.setText("1");
}
else {
int j = Integer.parseInt(btn_cherry.getText().toString());
btn_cherry.setText(String.valueOf(j + 1));
j = j;
}
}
};
View.OnClickListener orangeListener = new View.OnClickListener() {
boolean action = false;
#Override
public void onClick(View v) {
if (!action) {
action = true;
btn_orange.setText("1");
}
else {
int k = Integer.parseInt(btn_orange.getText().toString());
btn_orange.setText(String.valueOf(k + 1));
k = k;
}
}
};
View.OnClickListener waterListener = new View.OnClickListener() {
boolean action = false;
#Override
public void onClick(View v) {
if (!action) {
action = true;
btn_waterLemon.setText("1");
} else {
int q = Integer.parseInt(btn_waterLemon.getText().toString());
btn_waterLemon.setText(String.valueOf(q + 1));
q = q;
}
}
};
btn_apple.setOnClickListener(appleListener);
btn_cherry.setOnClickListener(cherryListener);
btn_orange.setOnClickListener(orangeListener);
btn_waterLemon.setOnClickListener(waterListener);
}
public void OnClickBsk(View view){
Intent intent = new Intent(SmActivity.this, BasketActivity.class);
startActivity(intent);
}
public void OnClickProfile(View view){
Intent intent = new Intent(SmActivity.this, ProfileActivity.class);
startActivity(intent);
}
}
Do this In Activity A when you click button to go to next Activity B
btn.setOnClickListener(v -> {
Intent i = new Intent(AActivity.this,BActivity.class);
// This below line sends Key- btnText and Value- Apple
i.putExtra("btnText","Apple");
startActivity(i);
});
In BActivity do this to button
// Here you receives data from activity a with the help of Key- btnText
btn.setText(getIntent().getStringExtra("btnText"));
This is a simple way to do this.
I Have Solved the answer for you,
Minor Explanations is in the comments in code.
Use this code as a concept and apply changes to yours based on your requirement.
XML of Activity A:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ActivityA">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Text Before Button Click"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:id="#+id/text_to_change"
android:textSize="20sp"
/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/text_to_change"
android:id="#+id/change_text_btn"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_margin="20dp"
android:text="Change Text and Start Activity B"
/>
</RelativeLayout>
Java of Activity A
package com.example.text_to_speech;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import org.w3c.dom.Text;
public class ActivityA extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_activity);
TextView textView;
Button button;
textView=findViewById(R.id.text_to_change);
button=findViewById(R.id.change_text_btn);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String newtext="New Text From Activity A";
textView.setText(newtext);
Intent intent=new Intent(ActivityA.this,ActivityB.class);
intent.putExtra("Change", newtext);//this string will be
//accessed by activityB
startActivity(intent);
}
});
}
}
XML of Activity B:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ActivityB">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Waiting for New Text"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:id="#+id/new_textview"
android:textSize="20sp"
android:visibility="gone"
/>
</RelativeLayout>
Java of Activity B:
package com.example.text_to_speech;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Toast;
public class ActivityB extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_b);
TextView textView;
textView=findViewById(R.id.new_textview);
// Below if block is looking for an intent, if it gets it and
// there is content in the extras with key "Change",
// it will make the textview in xml visible and update its string
// based on value set by Activity A
if(savedInstanceState == null) {
Bundle extras = getIntent().getExtras();
if (extras == null) {
Toast.makeText(ActivityB.this, "Can't Get the Intent", Toast.LENGTH_LONG).show();
} else {
String get_String = extras.getString("Change");
textView.setVisibility(View.VISIBLE);// be default i have set the visibility to gone in xml
//here it will get visible and then filled with the string sent by the intent in activity A
textView.setText(get_String);
}
}
}
}

Use java file for a xml layout file used in a dialog box

I need to use a .java file to perform actions for a .xml layout. I have used this layout for a dialog box. I have linked the .java file to that layout but it doesn't seem to work at all.
This is the MainActivity
package com.example.ayush.projectfive;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button btn;
AlertDialog.Builder alrt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button);
alrt = new AlertDialog.Builder(MainActivity.this);
alrt.setIcon(R.mipmap.ic_launcher);
alrt.setTitle("Login");
alrt.setCancelable(false);
alrt.setView(R.layout.mylayout);
alrt.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
alrt.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
alrt.show();
Intent i = new Intent(MainActivity.this,Second.class);
startActivity(i);
}
});
}
}
This is the activity_main
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.ayush.projectfive.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="EXIT"
android:id="#+id/button"
android:layout_gravity="center_horizontal" />
This is the dialog box layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="LOGIN"
android:id="#+id/textView"
android:layout_gravity="center_horizontal" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Username"
android:layout_marginTop="20dp"
android:id="#+id/editText" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Password"
android:layout_marginTop="15dp"
android:inputType="textPassword"
android:ems="10"
android:id="#+id/editText2" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Login"
android:layout_marginTop="20dp"
android:id="#+id/button3" />
This is the .java file I'd like to link with.
package com.example.ayush.projectfive;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Second extends AppCompatActivity{
EditText et, et2;
Button btn2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.mylayout);
et = (EditText) findViewById(R.id.editText);
et2 = (EditText) findViewById(R.id.editText2);
btn2 = (Button) findViewById(R.id.button3);
btn2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String s1 = et.getText().toString();
String s2 = et.getText().toString();
if(s1.equals(s2)){
Toast.makeText(Second.this, "Login Successful", Toast.LENGTH_SHORT).show();
Intent i = new Intent(Second.this,Third.class);
startActivity(i);
}
else{
}
}
});
}
}
This is the .java file I'd like to link with [...]
public class Second extends AppCompatActivity{
Okay... That's what this code does
Intent i = new Intent(MainActivity.this,Second.class);
startActivity(i);
If you are trying to use the views that are contained within the dialog box and respond to the buttons there to login, then you need to remove the button from the activity, add alrt.show() in the onCreate instead of onClick and move the Activity start code into the dialog's onClick handlers.
It's also worth mentioning that the object is a builder, so you can do this
View dialogView = LayoutInflater.from(MainActivity.this).inflate(R.layout.mylayout, null);
final EditText editUsername = dialogView.findViewById(R.id.editText);
// TODO: Get other views from mylayout.xml
new AlertDialog.Builder(MainActivity.this)
.setIcon(R.mipmap.ic_launcher)
.setTitle("Login")
.setCancelable(false)
.setView(dialogView)
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
String username = editUsername.getText().toString();
// TODO: Get more variables
// TODO: Verify credentials
Intent i = new Intent(MainActivity.this,Second.class);
startActivity(i);
}
})
.setNegativeButton("CANCEL", null)
.show();
And, as stated earlier, remove btn.setOnClickListener
just add alrt.show(); in your MainActivity.java e.g. here:
public class MainActivity extends AppCompatActivity {
Button btn;
AlertDialog.Builder alrt;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button);
alrt = new AlertDialog.Builder(MainActivity.this);
alrt.setIcon(R.mipmap.ic_launcher);
alrt.setTitle("Login");
alrt.setCancelable(false);
alrt.setView(R.layout.mylayout);
alrt.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
alrt.setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
alrt.show();
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this,Second.class);
startActivity(i);
}
});
}
}

Eclipse Android Checkbox

I would like to create checkbox with text that would behave something like what i have below in pseudo code:
Set in text in EditText field
if Button clicked:
create new Checkbox with entered text.
How do i go about doing that in Android?
So far ive got the button :) ... but dont know how to get new Checkbox with text in it ,if its clicked
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.text);
Button create = (Button) findViewById(R.id.button1);
create.setOnClickListener(this);
EditText textInCheckBox = (EditText) findViewById(R.id.editText1);
}
#Override
public void onClick(View v) {
// TODO Automatisch generierter Methodenstub
switch (v.getId()) {
case R.id.button1:
//after creating new checkbox with text in it
//Editbox should restet text field to null;
break;
}
}
}
Here is some code that will demonstrate how to add checkboxes dynamically with the title you entered into the EditText.
MainActivity.java
package com.example.test;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.RadioGroup;
import android.widget.Toast;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText txtTitle = (EditText) findViewById(R.id.txtTitle);
final Button btnCreate = (Button) findViewById(R.id.btnCreate);
final RadioGroup radContainer = (RadioGroup) findViewById(R.id.radContainer);
final LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
btnCreate.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String name = txtTitle.getText().toString().trim();
if (!name.isEmpty()) {
CheckBox checkBox = new CheckBox(MainActivity.this);
checkBox.setText(name);
checkBox.setLayoutParams(params);
radContainer.addView(checkBox);
} else {
Toast.makeText(MainActivity.this, "Enter a title for the checkbox", Toast.LENGTH_SHORT).show();
}
}
});
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical"
android:padding="16dp" >
<EditText
android:id="#+id/txtTitle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:imeOptions="actionDone" />
<Button
android:id="#+id/btnCreate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Create Checkbox" />
<RadioGroup
android:id="#+id/radContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>

Android app hangs when referencing the back button on Secondary screen

I have a small app that when button presses navigates when moving from main screen to next screen this works fine, but when I added a button on the next page (to go back) it breaks.
Fun.java
package com.forcetechnology.OptusApp;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class Fun extends Activity {
OnClickListener backListener;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fun);
Button backButtonf = (Button)findViewById(com.forcetechnology.OptusApp.R.id.backtoMainf);
backListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.OptusAppMain");
startActivity(i);
}
};
backButtonf.setOnClickListener(backListener);
}
}
Fun.Xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageButton
android:id="#+id/backtoMainf"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/val5" />
</LinearLayout>
Main.xml
<ImageButton
android:id="#+id/funbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:background="#drawable/val5"
android:src="#drawable/val5" />
<ImageButton
android:id="#+id/executionbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/funbutton"
android:layout_alignParentRight="true"
android:background="#drawable/val2"
android:src="#drawable/val2" />
<ImageButton
android:id="#+id/performancebutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/executionbutton"
android:layout_toLeftOf="#+id/funbutton"
android:background="#drawable/val3"
android:src="#drawable/val4" />
<ImageButton
android:id="#+id/innovationbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/executionbutton"
android:layout_alignParentLeft="true"
android:background="#drawable/val3"
android:src="#drawable/val3" />
<ImageButton
android:id="#+id/peoplebutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/innovationbutton"
android:layout_toLeftOf="#+id/executionbutton"
android:background="#drawable/val1"
android:src="#drawable/val1" />
</RelativeLayout>
OPtusAppMain.java
package com.forcetechnology.OptusApp;
import android.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
public class OptusAppMain extends Activity
{
OnClickListener funListener,executionListener,innovationListener,peopleListener,performanceListener;;
TextView testView;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(com.forcetechnology.OptusApp.R.layout.main);
ImageButton funButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.funbutton);
ImageButton executionButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.executionbutton);
ImageButton innovationButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.innovationbutton);
ImageButton peopleButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.peoplebutton);
ImageButton performanceButton = (ImageButton)findViewById(com.forcetechnology.OptusApp.R.id.performancebutton);
funListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.Fun");
startActivity(i);
}
};
executionListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.Execution");
startActivity(i);
}
};
innovationListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.Innovation");
startActivity(i);
}
};
peopleListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.People");
startActivity(i);
}
};
performanceListener = new OnClickListener()
{
public void onClick(View v)
{
Intent i = new Intent();
i.setClassName("com.forcetechnology.OptusApp", "com.forcetechnology.OptusApp.Performance");
startActivity(i);
}
};
funButton.setOnClickListener(funListener);
executionButton.setOnClickListener(executionListener);
innovationButton.setOnClickListener(innovationListener);
peopleButton.setOnClickListener(peopleListener);
performanceButton.setOnClickListener(performanceListener);
}
}
Edit: I have traced the error to this line Button backButtonf = (Button)findViewById(com.forcetechnology.OptusApp.R.id.backtoMainf); in fun.java.
In the onClick() of backListener, just call finish() to go back to the previous activity.
Lets take an example: You have two activities "A" & "B", You start your "B" activity from "A" that means your "A" activity is in stack so there is no need to start it again, just finish your "B" activity with "finish()" method.
public class A extends Activity{
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
public void onAbuttonClick()
{
startActivity(new Intent(A.this,B.class));
}
}
}
public class B extends Activity
{
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
}
public onBbuttonclick(View v)
{
finish();
}
}
}

layout elements not showing up

I have two activities and the first is generating properly however the second is not. only the first element in the xml file will show up. here is my xml file:
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/alternateActivity"
android:shadowColor="#color/shadowColor"></TextView>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/oldActivityButton"
android:text="#string/oldActivityButton"></Button>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/changeText"
android:text="#string/changeTextButton"></Button>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/originalText"
android:id="#+id/textToChange"></TextView>
</LinearLayout>
and here is my activity that corresponds:
package fsg.dev.activitytest;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class newActivity extends Activity {
private Button oldActivityButton;
private Button changeText;
private TextView textToChange;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.alternate);
oldActivityButton = (Button) findViewById(R.id.oldActivityButton);
changeText = (Button) findViewById(R.id.changeText);
textToChange = (TextView) findViewById(R.id.textToChange);
oldActivityButton.setOnClickListener(new OnClickListener(){
public void onClick(View view){
changeActivity();
}
});
changeText.setOnClickListener(new OnClickListener(){
public void onClick(View view){
changeText();
}
});
}
private void changeActivity(){
Intent i = new Intent(this, activityTest.class);
startActivity(i);
}
private void changeText(){
if(textToChange.equals(R.string.originalText)){
textToChange.setText(R.string.newText);
} else {
textToChange.setText(R.string.originalText);
}
}
}
has anyone else seen this problem? or know of a way to fix it?
Try to add android:orientation="vertical" to your LinearLayout
replace
Intent i = new Intent(this, activityTest.class);
by
Intent i = new Intent().setClass(this, activityTest.class);

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