Упражнение 6. Използване на Intent

MainActivity.kt

import android.app.Activity
import android.content.Intent
import android.net.Uri
import android.net.UrlQuerySanitizer
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.*

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
    }

    //I. Набиране на определен телефон
    fun btn_phone(view: View) {
        //1 Извикване на конретен телефон
        /*val phone="0881002003"
        val obaj= Intent(Intent.ACTION_DIAL, Uri.parse("tel:"+phone))
        startActivity(obaj)*/
        //2 Извикване на номера,въведен в EditText
        val nomer=findViewById<EditText>(R.id.editTextPhone).text.toString()
        if( nomer.isEmpty() || nomer.length!=10 )
            Toast.makeText(this, "Incorrect phone number", Toast.LENGTH_SHORT).show()
        else {
            val obaj = Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + nomer))
            startActivity(obaj)
        }
    }

    fun go_http(view: View) {
        //1
        /*val web=findViewById<TextView>(R.id.textView2).text.toString()
        val adres=Intent(Intent.ACTION_VIEW,Uri.parse(web))
        startActivity(adres)*/
        //2
        /*val obj=findViewById<TextView>(view.id)
        val web=obj.text.toString()
        val adres=Intent(Intent.ACTION_VIEW,Uri.parse(web))
        startActivity(adres)*/
        //3
        startActivity(Intent(Intent.ACTION_VIEW,Uri.parse(findViewById<TextView>(view.id).text.toString())))
    }

    fun btn_pictures(view: View) {
        // Галерия със снимки
        val intnt=Intent(Intent.ACTION_PICK)
        intnt.type="image/*"
        startActivity(intnt)
    }

    fun btn_show(view: View) {
        //val sec_act=Intent(this,SecondActivity::class.java)
        //startActivity(sec_act)
        val r_group=findViewById<RadioGroup>(R.id.radioGroup)
        if( r_group.checkedRadioButtonId==-1)
            Toast.makeText(this, "Изберете вид любимец", Toast.LENGTH_SHORT).show()
        else {
            val vid=findViewById<RadioButton>(r_group.checkedRadioButtonId).text.toString()
            //val tv=findViewById<TextView>(R.id.textView)
            //tv.text=vid
            val sec_act=Intent(this,SecondActivity::class.java)
            sec_act.putExtra("Animal",vid)
            startActivityForResult(sec_act,0)
        }
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if(resultCode==Activity.RESULT_OK) {
            val r_group=findViewById<RadioGroup>(R.id.radioGroup)
            val animal=findViewById<RadioButton>(r_group.checkedRadioButtonId).text.toString()
            val imeto= data?.getStringExtra("Ime")
            val tv = findViewById<TextView>(R.id.textView)
            tv.text = "Името на " + animal + " e " + imeto
        }
        else
            Toast.makeText(this, "Няма име", Toast.LENGTH_SHORT).show()
    }
}

Activity_main.xml

<TextView
    android:id="@+id/textView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="27dp"
    android:layout_marginEnd="26dp"
    android:text="Hello World!"
    app:layout_constraintEnd_toEndOf="@+id/editTextPhone"
    app:layout_constraintTop_toBottomOf="@+id/editTextPhone" />

<EditText
    android:id="@+id/editTextPhone"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="24dp"
    android:layout_marginTop="4dp"
    android:ems="10"
    android:inputType="phone"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="1dp"
    android:onClick="btn_phone"
    android:text="Call"
    app:layout_constraintEnd_toEndOf="@+id/button3"
    app:layout_constraintStart_toStartOf="@+id/button3"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="17dp"
    android:onClick="go_http"
    android:text="http://www.abv.bg"
    android:textAllCaps="false"
    android:textColor="#1534DD"
    android:textSize="20sp"
    android:textStyle="bold"
    app:layout_constraintBottom_toTopOf="@+id/textView3"
    app:layout_constraintStart_toStartOf="@+id/textView3" />

<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="31dp"
    android:layout_marginTop="188dp"
    android:onClick="go_http"
    android:text="http://www.google.com"
    android:textAllCaps="false"
    android:textColor="#1534DD"
    android:textSize="20sp"
    android:textStyle="bold"
    app:layout_constraintStart_toStartOf="@+id/button2"
    app:layout_constraintTop_toTopOf="parent" />

<Button
    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="100dp"
    android:layout_marginTop="34dp"
    android:onClick="btn_pictures"
    android:text="Pictures"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView3" />

<Button
    android:id="@+id/button3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="59dp"
    android:layout_marginTop="2dp"
    android:layout_marginEnd="61dp"
    android:onClick="btn_show"
    android:text="Go"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/radioGroup"
    app:layout_constraintTop_toTopOf="@+id/radioGroup" />

<RadioGroup
    android:id="@+id/radioGroup"
    android:layout_width="145dp"
    android:layout_height="209dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.218"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintVertical_bias="0.745">

    <RadioButton
        android:id="@+id/radioButton5"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Котка" />

    <RadioButton
        android:id="@+id/radioButton4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Куче"
        tools:layout_editor_absoluteX="58dp"
        tools:layout_editor_absoluteY="437dp" />

    <RadioButton
        android:id="@+id/radioButton6"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Животно"
        tools:layout_editor_absoluteX="58dp"
        tools:layout_editor_absoluteY="485dp" />
</RadioGroup>

SecondActivity.kt


import android.app.Activity
import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.EditText
import android.widget.TextView

class SecondActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_second)

        val anim=intent.getStringExtra("Animal")
        val tv=findViewById<TextView>(R.id.textView4)
        tv.text="Името на "+anim
    }

    fun btn_go(view:View) {
        val ime=findViewById<EditText>(R.id.editTextTextPersonName)
        val sec_intent=Intent()

        if( !ime.text.isEmpty() ) {
            sec_intent.putExtra("Ime", ime.text.toString())
            setResult(Activity.RESULT_OK, sec_intent)
            finish()
        }
        else {
            setResult(Activity.RESULT_CANCELED, sec_intent)
            finish()
        }
    }
}
Activity_Second.xml
<TextView
    android:id="@+id/textView4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="89dp"
    android:layout_marginTop="86dp"
    android:text="TextView"
    android:textSize="20sp"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<EditText
    android:id="@+id/editTextTextPersonName"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="83dp"
    android:layout_marginTop="21dp"
    android:ems="10"
    android:inputType="textPersonName"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView4" />

<Button
    android:id="@+id/button4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginStart="6dp"
    android:layout_marginTop="20dp"
    android:onClick="btn_go"
    android:text="Ok"
    app:layout_constraintStart_toStartOf="@+id/editTextTextPersonName"
    app:layout_constraintTop_toBottomOf="@+id/editTextTextPersonName" />