The code worked fine in other layout, but in others not..
layout XML:
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="register"
android:id="#+id/welcome_register"
android:background="#android:color/holo_green_dark"
android:textColor="#ffffff"
android:textSize="25sp"
android:onClick="register_Click" />
Activity:
package il.co.smartchip.hobby;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class LoginActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
getSupportActionBar().hide();
}
public void start_login(View view) {
//TODO log in
}
public void register_Click(View view) {
Intent intent = new Intent(this, RegisterActivity.class);
startActivity(intent);
}
I tried several things without success. Do you have any idea why it does not work?
In your case you need Intent i = new Intent(LoginActivity.this, RegisterActivity.class);.
LoginActivity.this points to the instance of the Activity you are currently in and you using it when you work with dynamic inner class like in your case.
this is for your current Object.
Im not so good teacher, hope you understand it.
Delete onclick on xml
<Button
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="register"
android:id="#+id/welcome_register"
android:background="#android:color/holo_green_dark"
android:textColor="#ffffff"
android:textSize="25sp"
/>
Init your button like that
package il.co.smartchip.hobby;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
public class LoginActivity extends AppCompatActivity {
private Button myButton;
private Activity thisActivity=this;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
getSupportActionBar().hide();
myButton=(Button)findViewById(R.id.welcome_register);
myButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(thisActivity, RegisterActivity.class);
startActivity(intent);
}
});
}}
Related
I have two buttons on my main Activity, which both should lead to another activity, but when I run the code it is showing an error.
MainActivity.java is this:
package com.assignment2.courier;
import static android.icu.lang.UCharacter.GraphemeClusterBreak.V;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
public void second (View v){
Intent i = new Intent(this, adelivery.class);
startActivity(i);
}
}
}
This is the button code in activity_main.xml
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginStart="85dp"
android:layout_marginBottom="234dp"
android:onClick="second"
android:text="Arrange Delivery"
android:textSize="20sp" />
Error:
Failed to compile values file
What is the problem here?
The problem here is that the second function is inside the onCreate
You need to adapt the code as follows:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void second (View v){
Intent i = new Intent(this, adelivery.class);
startActivity(i);
}
}
You should move second method out of the onCreate method; this is the problem in your code.
My initial plan was to have a UI preference so the user can pick a bg color from the main activity whenever he/she wants - I got that to work BUT it isn't showing up the right color it's specified to. i.e. When Red button is pressed in Main Activity, it shows up Blue in the next activity instead.
Here is a snippet of the code with only two buttons using multiple intents for demo purposes...
My Main layout:
<Button
android:id="#+id/buttonRed"
android:onClick="passBG"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="RED"
android:layout_marginLeft="18dp"
android:layout_marginStart="18dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:id="#+id/buttonBlue"
android:onClick="passBG"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="BLUE"
android:layout_alignParentBottom="true"
android:layout_alignLeft="#+id/button"
android:layout_alignStart="#+id/button" />
Main Activity is working:
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.view.View;
public class MainActivity extends AppCompatActivity {
View view;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
view=this.getWindow().getDecorView();
view.setBackgroundResource(R.color.gray);
public void passBG(View v) {
Intent intent = new Intent(this, AudioActivity.class);
intent.putExtra("Red", R.color.red);
intent.putExtra("Blue", R.color.blue);
startActivity(intent);
}
}
But something's not right with the second Activity:
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.RelativeLayout;
public class AudioActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_audio);
int redBG = getIntent().getIntExtra("Red", -1);
int blueBG = getIntent().getIntExtra("Blue", -1);
RelativeLayout rootView = (RelativeLayout) findViewById(R.id.activity_audio);
rootView.setBackgroundResource(redBG);
rootView.setBackgroundResource(blueBG);
}
}
I figured out that whichever color in "..."BG is implemented first in
rootView.setBackgroundResource("..."BG)
will determine the one that will only pop out. It's something to do with the sequence I figured - AT FIRST ATTEMPT, I tried using the intents on separate methods i.e.
public void goRED(View v)
{
view.setBackgroundResource(R.color.red);
Intent intent = new Intent(this, AudioActivity.class);
intent.putExtra("Red", R.color.red);
startActivity(intent);
}
public void goBLUE(View v)
{
view.setBackgroundResource(R.color.blue);
Intent intent = new Intent(this, AudioActivity.class);
intent.putExtra("Blue", R.color.blue);
startActivity(intent);
}
BUT THAT WILL ONLY END UP IN ERROR so I called the buttons on the same method to prevent that problem. So now I'm stuck with a new problem - how do I correctly implement multiple intents to show up the right color BG on the next activity? should I use some if-else statement into it? Any help would be appreciated. Thanks!
Well try this:
Main Activity is working:
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.view.View;
public class MainActivity extends AppCompatActivity {
View view;
private Button redBtn;
private Button blueBtn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
view=this.getWindow().getDecorView();
view.setBackgroundResource(R.color.gray); //This can be achieved by using the `android:background` attribute to your main element on your activity layout
redBtn = (Button) findViewById(R.id.buttonRed); //also, attributes ids on xml layouts shouldnt use uppercase letters, separete words using '_'
blueBtn = (Button) findViewById(R.id.buttonBlue);
redBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onButtonClick(R.color.red);
}
});
blueBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onButtonClick(R.color.blue);
}
});
}
private void onButtonClick(int color){
Intent intent = new Intent(this, AudioActivity.class);
intent.putIntExtra("background",color);
startActivity(intent);
}
}
then, on your second activity:
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.RelativeLayout;
public class AudioActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_audio);
int color = getIntent().getIntExtra("background", -1);
if(color != -1){
RelativeLayout rootView = (RelativeLayout) findViewById(R.id.activity_audio);
rootView.setBackgroundResource(color);
}
}
}
I have problem with button in activity_main.xml,
I need to launch by click on "imageButton8" a webView (website URL) in application.
MainActivity.Java
package com.XX.app;
import com.XX.app.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.ImageButton;
public class MainActivity extends Activity {
WebView view;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Empêcher le téléphone de passer en mode veille
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
//When User click on the button imageButton8 the Activity2 launch
Button imageButton8 = (Button) findViewById(R.id.imageButton8);
setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), Activity2.class);
startActivityForResult(intent, 0);
}
});
}
private void setOnClickListener(OnClickListener onClickListener) {
// TODO Auto-generated method stub
}
//loads RETURN URL on lastpage
#Override
public void onBackPressed() {
if(this.view.canGoBack())
{
this.view.goBack();
} else {
new AlertDialog.Builder(this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("إغلاق تطبيق جمعية البر و التعاون")
.setMessage("هل أنت متأكد أنك تريد إغلاق تطبيق جمعية البر و التعاون ؟")
.setPositiveButton("نعم", new DialogInterface.OnClickListener()
{
#Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
})
.setNegativeButton("لا", null)
.show();
}
}
}
activity_main.xml for imageButton8 is
<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:background="#drawable/background_1">
<ImageButton
android:id="#+id/imageButton8"
android:onClick="click"
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_marginLeft="140dp"
android:layout_marginTop="380dp"
android:background="#0000"
android:scaleType="fitXY"
android:src="#drawable/btn_www" />
</RelativeLayout>
Activity2.java
package com.XX.app;
import com.XX.app.R;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.app.Application;
import android.os.Bundle;
public class Activity2 extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_webview);
}
}
activity_webview.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:background="#drawable/background_1">
<WebView
android:id="#+id/webView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" />
</RelativeLayout>
In the same project,
2. Others Issues: I have 08 buttons. How do I execute each button in its template xml?
For example: Button 1 => about_obama.xml. When user click (in this file) it will find the description of obama.
Button 2 => ....xml...etc!
Button 3......
You need to set the onclickListener for the ImageButton using the ImageButton's setOnClickListener() method. So, in your MainActivity, inside your onCreate() method, do the following:
Button imageButton8 = (Button) findViewById(R.id.imageButton8);
// Set the OnClickListener on the button itself
imageButton8.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, Activity2.class); // Use the MainActivity context
startActivityForResult(intent, 0);
}
});
// You should delete the private setOnClickListener() method as it does not
// have any purpose
To specify the onClick() in the xml when the Button is clicked, set the:
android:onClick:"some_method"
property for your button. Then declare and define this method in your Activity.
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();
}
}
}
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);