Develop Reference

Add checkboxes on click

I have an image file on which if clicked anywhere I would like X'd checkboxes to show up. (Right now its set up as check marks). The code that I have is just for connecting page 1 to page 2 with a button click. Here it is
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;
public class MainActivity extends AppCompatActivity {
public static Button button1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
OnclickButtonListener();
}
public void OnclickButtonListener() {
button1 = (Button) findViewById(R.id.nextpage);
button1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
EditText userTextEntry = (EditText)findViewById(R.id.BRinfo);
String userdata = userTextEntry.getText().toString();
int userNumber = Integer.parseInt(userdata);
Intent intent = new Intent(MainActivity.this,Page2.class);
intent.putExtra("para name",userNumber);
startActivity(intent);
}
});
}}
Part of the XML code is
<?xml version="1.0" encoding="utf-8"?>
<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: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="vt.tacticalcombat.MainActivity"
android:clickable="true">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imageView2"
android:src="#mipmap/combat2"
android:layout_alignBottom="#+id/editText17"
android:layout_alignLeft="#+id/last4"
android:layout_alignStart="#+id/last4"
android:layout_alignRight="#+id/tableLayout"
android:layout_alignEnd="#+id/tableLayout"
android:layout_alignTop="#+id/imageView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="NEXT"
android:id="#+id/nextpage"
android:layout_alignBottom="#+id/tableLayout"
android:layout_alignRight="#+id/otherinfo"
android:layout_alignEnd="#+id/otherinfo"
tools:ignore="HardcodedText,RtlHardcoded"
android:nestedScrollingEnabled="true" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/checkBox28"
android:checked="false"
android:visibility="visible"
android:layout_alignBottom="#+id/rarmtypeinfo"
android:layout_toRightOf="#+id/mvc"
android:clickable="true"
android:layout_toEndOf="#+id/mvc" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:layout_alignBottom="#+id/checkBox28"
android:layout_alignRight="#+id/injury"
android:layout_alignEnd="#+id/injury"
android:layout_alignTop="#+id/larmtype"
android:layout_alignLeft="#+id/checkBox28"
android:layout_alignStart="#+id/checkBox28" />
</RelativeLayout>
I tried using this link! but it did not work. How can I do this? Any help is appreciated

Android app not able to open web link

I have a button at the end of this app that takes the user to their default browser and to a predetermined link. Unfortunately, that button is broken. I am unsure of whether this is a problem with Java or with XML, but the code for both is attached.
package com.example.ldsm3;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity
import android.content.DialogInterface;
import android.content.Intent;
import android.text.SpannableString;
import android.text.method.LinkMovementMethod;
import android.text.method.MovementMethod;
import android.view.Menu;
import android.widget.Button;
import android.widget.TextView;
public class Finished extends Activity {
public void onClick(Button button1)
{
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("URL HERE"));
startActivity(browserIntent);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_finished);
// tv is the ID for the TextView in the XML file
TextView tv = (TextView) findViewById(R.id.textView2);
// set the TextView to show the score
tv.setText(Misc.correct + "/" + Misc.total);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.finished, menu);
return true;
}
}
And the XML code...
<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: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=".Finished" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="69dp"
android:text="#string/Finished" />
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignRight="#+id/textView1"
android:layout_marginBottom="19dp"
android:text="Go to the game!" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/button1"
android:layout_centerHorizontal="true"
android:layout_marginBottom="93dp"
android:text="0/0" />
</RelativeLayout>
How do I fix this? Is it because of XML or Java? Did I not properly define the intent?

You need to add this on your onCreate() method:
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
//Do your stuff here
}
});

How to switch between activities/screens in Android

my first Activity Xm
<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="#a5c63b"
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=".MainActivity" >
<Button
android:id="#+id/btn1"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="70dp"
android:background="#434d23"
android:text="Ok To Continue"
android:onClick="frontt"
android:textColor="#a5c63b" />
<ImageView
android:id="#+id/imageView11"
android:layout_width="250dp"
android:layout_height="250dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:src="#drawable/question" />
<TextView
android:id="#+id/txtview11"
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Loading..."
android:textSize="12dp" />
</RelativeLayout>
This is my Second Activity 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="#a5c63b"
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=".MainActivity" >
<Button
android:id="#+id/btn"
android:layout_width="match_parent"
android:layout_height="70dp"
android:onClick="onClick"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="70dp"
android:background="#434d23"
android:text="OK"
android:textColor="#a5c63b" />
<EditText
android:id="#+id/txtedit"
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_alignLeft="#+id/button1"
android:layout_alignParentTop="true"
android:layout_marginTop="50dp"
android:background="#edf2db"
android:ems="10"
android:inputType="numberDecimal" />
<ImageView
android:id="#+id/imageView1"
android:layout_width="250dp"
android:layout_height="250dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:src="#drawable/question" />
<TextView
android:id="#+id/txtview"
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_alignBottom="#+id/txtedit"
android:layout_alignLeft="#+id/txtedit"
android:layout_marginBottom="21dp"
android:text="Guess Single Digit Number"
android:textSize="12dp" />
<TextView
android:id="#+id/txtview2"
android:layout_width="match_parent"
android:layout_height="20dp"
android:layout_alignLeft="#+id/btn"
android:layout_below="#+id/btn"
android:text="TextView" />
</RelativeLayout>
this is my first java file code
package com.example.game;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.Button;
public class MainActivity extends Activity {
MediaPlayer btnsound;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.front);
Button next = (Button) findViewById(R.id.btn1);
btnsound = MediaPlayer.create(MainActivity.this,R.raw.game);
btnsound.start();
next.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Intent nextScreen = new Intent(getApplicationContext(), CopyOfMainActivity.class);
startActivity(nextScreen);
//finish();
}
} );
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
this is my Second java file
package com.example.game;
import java.util.Random;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.app.Activity;
import android.view.Menu;
public class CopyOfMainActivity extends Activity {
MediaPlayer btnsound;
Random random = new Random();
int randnumber = random.nextInt(10);
Button b2;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnsound = MediaPlayer.create(CopyOfMainActivity.this,R.raw.game);
btnsound.start();
b2= (Button) findViewById(R.id.btn);
b2.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
EditText input = (EditText)findViewById(R.id.txtedit);
TextView resultText = (TextView) findViewById(R.id.txtview2);
String inputstring = input.getText().toString();
int number = Integer.parseInt(inputstring);
if(randnumber==number)
{
resultText.setText("you win" );
ImageView image = (ImageView) findViewById(R.id.imageView1);
image.setImageResource(R.drawable.win);
}
else if (number>randnumber)
{
resultText.setText("you guess high number" );
ImageView image = (ImageView) findViewById(R.id.imageView1);
image.setImageResource(R.drawable.tryagain);
}
else if (number<randnumber)
{
resultText.setText("you guess low number" );
ImageView image = (ImageView) findViewById(R.id.imageView1);
image.setImageResource(R.drawable.lose);
}
}
} );
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
I have one button on First Activity xml layout .The first Activity Layout display after run application but whenever i click on button on first xml first want to go on next laytout after clicking then this error show in LogCat tab and application stop working.
AndroidRuntime at dalvik.system.NativeStart.main(Native Method)
what i should do?

The right way to do this given below:
next.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
Intent nextScreen = new Intent(MainActivity.this, CopyOfMainActivity.class);
startActivity(nextScreen);
//finish();
}
} );
Hope this will work fine.

Please add your both activities to Manifest file if you missed out.
<application>
<activity android:name="Activity1">
</activity>
<activity android:name="Activity2">
</activity>

public void butt591(View v) {
v.startAnimation(fivenineclick);
Button but591 = (Button) findViewById(R.id.button591);
but591.setBackgroundColor(Color.parseColor("#ee4035"));
Intent bu591 = new Intent();
bu591.setClass(this, level5q10.class);
startActivity(bu591);
finish();
}
hey, i copy pasted a part of code in my app here 591 denotes level 5 ninth question and on selecting first option
that is wrong answer so on clicking the option it will set background to #ee4035 which is red color and when the user presses this option it will switch to level 5q10
I hope you understood from this code

How to connect xml with a class on android

I have created a new .xml file named "new_game.xml" and a class named "New_Game.java"
These are not Main activity
new_game.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"/>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Click"
android:id="#+id/button"
android:layout_marginTop="27dp"
android:layout_alignRight="#+id/editText"/>
<EditText android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:ems="10"
android:id="#+id/editText"
android:layout_marginTop="16dp"
android:layout_below="#+id/button"
android:layout_marginLeft="11dp"/>
<ImageView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/imageView"
android:paddingTop="50dp"
android:paddingBottom="50dp"
android:paddingLeft="50dp"
android:paddingRight="50dp"
android:background="#drawable/ic_launcher"
android:layout_centerVertical="true"
android:layout_toLeftOf="#+id/button"/>
</RelativeLayout>
New_Game.java:
package com.example.logosquiz;
import android.app.Activity;
import android.app.ListActivity;
import android.app.TabActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RelativeLayout;
public class New_Game extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.new_game);
Button button1 = (Button)findViewById(R.id.button);
final EditText editText1 = (EditText)findViewById(R.id.editText);
ImageView imageView1 = (ImageView)findViewById(R.id.imageView);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
editText1.setText("Hello Android");
}
});
}
Please explain it very well
I put on AndroidManifest.xml this
<activity android:name=".New_Game"> /activity>
and this on the event onClick
Intent myIntent = new Intent(v.getContext(), New_Game.class);
startActivityForResult(myIntent, 0);

Your XML is wrong. Remove the last / from the first RelativeLayout in your 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">
instead of
<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"/>
Although Eclipse should have warned you about this.

your code is correct but
button android:layout_marginTop="27dp"
edittext android:layout_marginTop="16dp"
edit text is placed on the button so when you click you are clicking on edittext not button change edittext marginTop to 30dp and check
public class New_Game extends Activity {
EditText editText1;
#override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.new_game);
Button button1 = (Button)findViewById(R.id.button);
editText1 = (EditText)findViewById(R.id.editText);
ImageView imageView1 = (ImageView)findViewById(R.id.imageView);
button1.setOnClickListener(new View.OnClickListener(){
public void onClick(View v){
editText1.setText("Hello Android");
}
});
}

Activity not found exception: unable to find actitvity class

In following code shown below
I am trying open a new activity(memo.class to view.class) when click view button.but showing an error "activity not found exception: unable to find explicit activity class".
what is wrong in my code??
please help me
my code:
memo.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="match_parent">
<TextView android:text="Titile" android:id="#+id/TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
<EditText android:id="#+id/question" android:layout_width="match_parent" android:layout_height="wrap_content" android:text=""></EditText>
<TextView android:text="Text" android:id="#+id/TextView01" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
<EditText android:minLines="6" android:maxLines="10" android:id="#+id/answer" android:layout_width="match_parent" android:layout_height="wrap_content" android:text=""></EditText>
<TableLayout android:layout_height="wrap_content"
android:layout_width="wrap_content" android:layout_gravity="center"
android:stretchColumns="*">
<TableRow>
<Button android:id="#+id/add" android:layout_width="wrap_content" android:text="ADD" android:layout_height="wrap_content"></Button>
<Button android:id="#+id/view" android:layout_width="wrap_content" android:text="VIEW" android:layout_height="wrap_content"></Button>
</TableRow>
</TableLayout>
</LinearLayout>
memo.java
package quesansw.the1;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
public class Memo extends Activity{
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final Dialog d1 = new Dialog(this);
Window window = d1.getWindow();
window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
d1.setTitle("Register Questions");
d1.setContentView(R.layout.memo);
d1.show();
Button view1 = (Button) d1.findViewById(R.id.view);
Button add = (Button) d1.findViewById(R.id.add);
add.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
EditText add = (EditText) d1.findViewById(R.id.question);
EditText view = (EditText) d1.findViewById(R.id.answer);
System.out.println(add.getText());
System.out.println(view.getText());
}
});
view1.setOnClickListener(new View.OnClickListener() {
public void onClick(View v)
{
Intent intent = new Intent(getBaseContext(), View.class);
startActivity(intent);
}
});
}
}
view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="match_parent">
<EditText android:id="#+id/question" android:layout_width="match_parent" android:layout_height="wrap_content" android:text=""></EditText>
</LinearLayout>
view.java
package quesansw.the1;
import android.app.Activity;
import android.app.Dialog;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;
public class View extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
final Dialog d1 = new Dialog(this);
Window window = d1.getWindow();
window.setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);
d1.setTitle("Login");
d1.setContentView(R.layout.view);
d1.show();
}
}

You should declare the Activity in the manifest:
<activity
android:name="com.yourpackagename.View"/>
Basically, your AndroidManifest.xml file (found in the root package folder) acts as a "settings" or "main controller" for your entire application, and so the system needs to be aware of each activity (essentially a page) that you will transition to or use.
Here are other things that can go within the Activity tag in the Manifest file.
Side Note: as #Tyler M. says, you should use another name than "View" for your Activity.

Rename your Activity subclass to something other than View.
It is generally a bad idea to use names of existing classes - it is a reference disaster waiting to happen.

You most likely forgot to include it in the Manifest.xml