How to open a second activity on click of button in android app

AndroidAndroid IntentAndroid Activity

Android Problem Overview

I am learning to build android applications and I need some specific help. I can't seem to get my head around which bits of template code I am required to change, and which bits are static.

In the LAYOUT folder I have my ACTIVITY_MAIN.XML which reads

 <?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="horizontal">

 <Button
    android:id="@+id/button1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="@string/main_buttons_photos" />

 </LinearLayout>

Next, I have my second activity ACTIVITY_SEND_PHOTOS.XML which 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" >

 <TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:text="@string/hello_world"
    tools:context=".SendPhotos" />

 <TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_alignParentTop="true"
    android:text="@string/title_activity_send_photos"
    android:textAppearance="?android:attr/textAppearanceLarge" />

 </RelativeLayout>

I then have my MainActivity.java (is this the .class?) this reads package com.example.assent.bc;

 import android.os.Bundle;
 import android.app.Activity;
 import android.view.Menu;
 import android.view.View;

 public class MainActivity extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
     getMenuInflater().inflate(R.menu.activity_main, menu);
     return true;
 }
 /** Called when the user clicks the Send button */
 public void sendMessage(View view) {
     // Do something in response to button
 }
 }

and then my SendPhotos.java file which is;

 package com.example.assent.bc;

 import android.os.Bundle;
 import android.app.Activity;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.support.v4.app.NavUtils;

 public class SendPhotos extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_send_photos);
    getActionBar().setDisplayHomeAsUpEnabled(true);
 }
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_send_photos, menu);
    return true;
 }


 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            NavUtils.navigateUpFromSameTask(this);
            return true;
    }
    return super.onOptionsItemSelected(item);
 }

 }

I would like the button in my main activity to link through to my sendphotos activity, simply opening up that activity, nothing fancy, not sending any data or anything.

I know that somewhere I need my

 Intent i = new Intent(FromActivity.this, ToActivity.class);
 startActivity(i);

but I have no idea what to replace ToActivity.class with or what else I need where.

Android Solutions

Solution 1 - Android

You can move to desired activity on button click. just add this line.

android:onClick="sendMessage"

xml:

 <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="sendMessage"
        android:text="@string/button" />

In your main activity just add this method:

public void sendMessage(View view) {
	Intent intent = new Intent(FromActivity.this, ToActivity.class);
	startActivity(intent);
}

And the most important thing: don't forget to define your activity in manifest.xml

 <activity>
      android:name=".ToActivity"
      android:label="@string/app_name">          
 </activity>

Solution 2 - Android

Try this

  Button button;

public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);

button=(Button)findViewById(R.id.button1);
        button.setOnClickListener(new View.OnClickListener() {
        			
        			@Override
        			public void onClick(View v) {
        				// TODO Auto-generated method stub
        				Intent i = new Intent(getApplicationContext(),SendPhotos.class);
                        startActivity(i);
        			}
        		});

 }

Solution 3 - Android

From Activity : where you are currently ?

To Activity : where you want to go ?

Intent i = new Intent( MainActivity.this, SendPhotos.class); startActivity(i);

Both Activity must be included in manifest file otherwise it will not found the class file and throw Force close.

Edit your Mainactivity.java

crate button's object;

now Write code for click event.

        Button btn = (button)findViewById(R.id.button1);
         btn.LoginButton.setOnClickListener(new View.OnClickListener() 
	   {

        		@Override
       			public void onClick(View v) 
           		{
                 //put your intent code here
                }
   });

Hope it will work for you.

Solution 4 - Android

Button btn = (Button) findViewById(R.id.button1);

btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        Intent myIntent = new Intent(MainActivity.this, MainActivity2.class);
        MainActivity.this.startActivity(myIntent);     	 
    }  
});

The answer for the complete noob from a complete noob: MainActivity is the name of the first activity. MainActivity2 is the name of the second activity. button1 is the I.D of the button in xml for MainActivity Activity.

Solution 5 - Android

just follow this step (i am not writing code just Bcoz you may do copy and paste and cant learn)..

  1. first at all you need to declare a button which you have in layout

  2. Give reference to that button by finding its id (using findviewById) in oncreate

  3. setlistener for button (like setonclick listener)

  4. last handle the click event (means start new activity by using intent as you know already)

  5. Dont forget to add activity in manifest file

BTW this is just simple i would like to suggest you that just start from simple tutorials available on net will be better for you..

Best luck for Android

Solution 6 - Android

Replace the below line code:

import android.view.View.OnClickListener;
public class MainActivity extends Activity implements OnClickListener{
   Button button;
    @Override
     public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button=(Button)findViewById(R.id.button1);
        button.setOnClickListener(this);
      }
       public void onClick(View v) {
        if(v.getId==R.id.button1){
 	  Intent i = new Intent(FromActivity.this, ToActivity.class);
               startActivity(i);
            }
        }
     }

Add the below lines in your manifest file:

   <activity android:name="com.packagename.FromActivity"></activity>
   <activity android:name="com.packagename.ToActivity"></activity>

Solution 7 - Android

Replace your MainActivity.class with these code

public class MainActivity extends Activity {

Button b1;
@Override
public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 b1=(Button)findViewById(R.id.button1);
 b1.setOnClickListener(new View.onClickListener()
 {
  public void onClick(View v)
   {
       Intent i=new Intent(getApplicationContext(),SendPhotos.class);
       startActivity(i);
    }
 }
 )
}

Add these Code in your AndroidManifest.xml after the </activity> and Before </application>

<activity android:name=".SendPhotos"></activity>

Solution 8 - Android

This always works, either one should be just fine:

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    Button btn = (Button) findViewById(R.id.button1);
    btn.setOnClickListener(new View.OnClickListener() {
        @Override
	    public void onClick (View v) {
            startActivity(new Intent("com.tobidae.Activity1"));
        }
        //** OR you can just use the one down here instead, both work either way
        @Override
	    public void onClick (View v){
	        Intent i = new Intent(getApplicationContext(), ChemistryActivity.class);
            startActivity(i);
        }
    }
}

Solution 9 - Android

add below code to activity_main.xml file:

<Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="buttonClick"
        android:text="@string/button" />

and just add the below method to the MainActivity.java file:

public void buttonClick(View view){
  Intent i = new Intent(getApplicationContext()SendPhotos.class);
  startActivity(i);
}

Solution 10 - Android

If you have two buttons and have the same id call to your button click events like this:

Button btn1;
Button btn2;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    btn1= (Button)findViewById(R.id.button1);

    btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent=new Intent(MainActivity.this,target.class);
            startActivity(intent);
        }
    });

    btn2=(Button) findViewById(R.id.button1);//Have same id call previous button---> button1

    btn2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    });

When you clicked button1, button2 will work and you cannot open your second activity.

Solution 11 - Android

 <Button
            android:id="@+id/btnSignIn"
            android:layout_width="250dp"
            android:layout_height="40dp"
            android:layout_marginEnd="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginRight="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="16dp"
            android:background="@drawable/circal"
            android:text="Sign in"
            android:textColor="@color/white"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/etPasswordLogin" />

IN JAVA CODE

Button signIn= (Button) findViewById(R.id.btnSignIn);

signIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(SignInPage.this,MainActivity.class));
            }
        });

}

Solution 12 - Android

You can move to desired activity on button click. just add
android:onClick="timerApp"this line.

xml:

 <Button
        android:id="@+id/timer_app"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="timerApp"
        android:text="Click To run Timer Activity" />

In your main activity just add this method:

 public void timerApp(View view){
        Intent intent= new Intent(MainActivity.this,TimerActivity.class);
        startActivity(intent);
    }

OR in onCreate() method add below code

Button btn =findViewById(R.id.timer_app);//Don't need to type casting in android studio 3

btn.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        Intent intent = new Intent(MainActivity.this, TimerActivity.class);
        startActivity(intent);       
    }  
});
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