Sometimes, we need to pass values from activity to another activity. For this, we use Intent methods. Firstly, let’s remember how to pass a value to another activity. 

Please do not forget importing Intent;

import android.content.Intent // ActivityClass1


We have ActivityClass1 and ActivityClass2, while passing it to the ActivityClass2;

public class ActivityClass1:AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity1_layout)
        
        var number1 = 123456
        
        val intent = Intent(this@ActivityClass1,ActivityClass2::class.java)
        intent.putExtra("number1", number1)
        
        startActivity(intent)      
          
        }
    }
}


We passed it, and right now we would like to get it.

public class ActivityClass2:AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity2_layout)
        
        val readintent = getIntent()
        var passedNumber = readintent.getIntExtra("number1")      
          
        }
    }
}


As you can see, we have assigned the variable number1 in Activity 1 to the “passedNumber” variable in ActivityClass2. Now we have made this variable available in ActivityClass2 as well.

In order to send 1D-Array, it is easy. You will use the same way as above. While recieving, “getArrayExtra()” method that you can use. However, it is different a bit to send 2D-Array or Multi-Dimensional Arrays. Let’s show how to recieve 2D-Arrays. 

public class ActivityClass1:AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity1_layout)
        
        var matrix =  Array(3){IntArray(3)}
        
        var count = 1
        
        for(i in 0 until 3)
        {
         for(j in 0 until 3)
         {
          matrix[i][j]=count
         }
         count++
        }
        
        
        
        
        val intent = Intent(this@ActivityClass1,ActivityClass2::class.java)
        intent.putExtra("matrix", matrix)
        
        startActivity(intent)      
          
        }
    }
}


2D-Array has been defined above. Right now, we will get this at the ActivityClass2.

public class ActivityClass2:AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity2_layout)
        
        val readintent = getIntent()
        var passedMatrix : Array<IntArray> = readintent.getSerializableExtra("matrix") as Array<IntArray>      
          
        }
    }
}


As seen above, we used the “getSerializableExtra()” method to get the 2D array. Notice that we sent the matrix as a Bundle in the “intent.putExtra(“matrix”, matrix) method in ActivityClass1, so we ordered the Bundle to be a 2D array with the keyword “as”. You can ask, if it is 3D, 4D or Multi Dimensional Array, what should we do? You will just define it like this;

var passedMatrix : Array<Array<IntArray>>  = readintent.getSerializableExtra("matrix") as Array<Array<IntArray>> //3D-Array

var passedMatrix2 : Array<Array<Array<IntArray>>>  = readintent.getSerializableExtra("matrix") as Array<Array<Array<IntArray>>> //4D-Array
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