Kotlin Veri Tipleri:Numbers

Kotlin Android Paket Adı Değiştirme

Kotlin Video Player

İlkin Manifest dosyasına aşağıdaki izinler eklenir

1. <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>  
2. <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>  

Ardından layout dosyasına aşağıdaki kod eklenir

1. <?xml version="1.0" encoding="utf-8"?>  
2. <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     xmlns:app="http://schemas.android.com/apk/res-auto"  
4.     xmlns:tools="http://schemas.android.com/tools"  
5.     android:layout_width="match_parent"  
6.     android:layout_height="match_parent"  
7.     tools:context="example.javatpoint.com.kotlinvideoplayer.MainActivity">  
8.   
9.     <FrameLayout  
10.         android:layout_width="match_parent"  
11.         android:layout_height="wrap_content">  
12.   
13.         <VideoView  
14.             android:id="@+id/videoView"  
15.             android:layout_width="wrap_content"  
16.             android:layout_height="308dp"  
17.             android:layout_marginBottom="0dp"  
18.             android:layout_marginEnd="0dp"  
19.             android:layout_marginStart="0dp"  
20.             app:layout_constraintBottom_toBottomOf="parent"  
21.             app:layout_constraintEnd_toEndOf="parent"  
22.             app:layout_constraintHorizontal_bias="0.0"  
23.             app:layout_constraintStart_toStartOf="parent"  
24.             app:layout_constraintTop_toTopOf="parent"  
25.             app:layout_constraintVertical_bias="1.0" />  
26.     </FrameLayout>  
27. </android.support.constraint.ConstraintLayout>  

Ardından Main Actity aşağıdaki şekle çevrilir

Üsttte kendi packet isminin altına şunları yapıştır

1. import android.net.Uri  
2. import android.net.Uri.*  
3. import android.support.v7.app.AppCompatActivity  
4. import android.os.Bundle  
5. import android.os.Environment  
6. import android.widget.MediaController  
7. import android.widget.VideoView  
8.   
9. class MainActivity : AppCompatActivity() {  
10.   
11.     override fun onCreate(savedInstanceState: Bundle?) {  
12.         super.onCreate(savedInstanceState)  
13.         setContentView(R.layout.activity_main)  
14.   
15.         val videoView = findViewById<VideoView>(R.id.videoView)  
16.         //Creating MediaController  
17.         val mediaController = MediaController(this)  
18.         mediaController.setAnchorView(videoView)  
19.         //specify the location of media file  
20.         val uri:Uri = parse(Environment.getExternalStorageDirectory().getPath() + "/Movies/video.mp4")  
21.         //Setting MediaController and URI, then starting the videoView  
22.         videoView.setMediaController(mediaController)  
23.         videoView.setVideoURI(uri)  
24.         videoView.requestFocus()  
25.         videoView.start()  
26.     }  
27. }  

Kotlin Fotoğrafları Arkaplan Yapma Programı Kodları

```kotlin

import android.os.Bundle

import android.widget.ImageView

import androidx.appcompat.app.AppCompatActivity

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        val imageView: ImageView = findViewById(R.id.imageView)

        imageView.setImageResource(R.drawable.background_image)

    }

}

```

Output:

The code provided sets a background image from the assets folder in an ImageView in an Android app using Kotlin.

Kotlin Audio Recorder

import android.Manifest

import android.content.pm.PackageManager

import android.media.MediaRecorder

import android.os.Bundle

import android.os.Environment

import android.widget.Button

import android.widget.Toast

import androidx.appcompat.app.AppCompatActivity

import androidx.core.app.ActivityCompat

import androidx.core.content.ContextCompat

import java.io.IOException

class MainActivity : AppCompatActivity() {

    private lateinit var mediaRecorder: MediaRecorder

    private var outputFile: String = ""

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_main)

        val recordButton: Button = findViewById(R.id.record_button)

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {

            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.RECORD_AUDIO), 1)

        }

        outputFile = Environment.getExternalStorageDirectory().absolutePath + "/recording.3gp"

        mediaRecorder = MediaRecorder()

        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC)

        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)

        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB)

        mediaRecorder.setOutputFile(outputFile)

        recordButton.setOnClickListener {

            try {

                mediaRecorder.prepare()

                mediaRecorder.start()

                Toast.makeText(this, "Recording started", Toast.LENGTH_SHORT).show()

            } catch (e: IOException) {

                e.printStackTrace()

            }

        }

    }

    override fun onStop() {

        super.onStop()

        mediaRecorder.stop()

        mediaRecorder.release()

        Toast.makeText(this, "Recording stopped", Toast.LENGTH_SHORT).show()

    }

}

Kotlin Audio Recorder Örneği

import android.Manifest

import android.content.pm.PackageManager

import android.media.MediaRecorder

import android.os.Bundle

import android.os.Environment

import android.widget.Button

import android.widget.Toast

import androidx.appcompat.app.AppCompatActivity

import androidx.core.app.ActivityCompat

import androidx.core.content.ContextCompat

import java.io.IOException

class AudioRecorderActivity : AppCompatActivity() {

    private lateinit var mediaRecorder: MediaRecorder

    private var isRecording = false

    override fun onCreate(savedInstanceState: Bundle?) {

        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_audio_recorder)

        val recordButton = findViewById<Button>(R.id.record_button)

        recordButton.setOnClickListener {

            if (isRecording) {

                stopRecording()

            } else {

                if (checkPermissions()) {

                    startRecording()

                }

            }

        }

    }

    private fun startRecording() {

        mediaRecorder = MediaRecorder()

        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC)

        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)

        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB)

        val filePath = Environment.getExternalStorageDirectory().absolutePath + "/recording.3gp"

        mediaRecorder.setOutputFile(filePath)

        try {

            mediaRecorder.prepare()

            mediaRecorder.start()

            isRecording = true

            Toast.makeText(this, "Recording started", Toast.LENGTH_SHORT).show()

        } catch (e: IOException) {

            e.printStackTrace()

        }

    }

    private fun stopRecording() {

        mediaRecorder.stop()

        mediaRecorder.release()

        isRecording = false

        Toast.makeText(this, "Recording stopped", Toast.LENGTH_SHORT).show()

    }

    private fun checkPermissions(): Boolean {

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {

            ActivityCompat.requestPermissions(this, arrayOf(Manifest.permission.RECORD_AUDIO), 1)

            return false

        }

        return true

    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {

        super.onRequestPermissionsResult(requestCode, permissions, grantResults)

        if (requestCode == 1 && grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

            startRecording()

        } else {

            Toast.makeText(this, "Permission denied", Toast.LENGTH_SHORT).show()

        }

    }

}