android setOnClickListener (v) не может решить 'v'

Question

Я новичок в android, и я пытаюсь заставить слушателя работать как на видеозаписи, так и на съемке. Он продолжает давать мне возможность не разрешить ошибку «v», и у меня также возникают проблемы с меткой времени, чтобы распознать дату. Я попытался переключить и включить различные API 10, 23 и 25. Эта версия этого приложения в настоящее время работает 23, чтобы попытаться преодолеть мои проблемы с моим слушателем. Любая помощь будет принята с благодарностью.

import android.app.Activity; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.net.Uri; 
import android.os.Build; 
import android.os.Environment; 
import android.provider.MediaStore; 
import android.support.annotation.RequiresApi; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.Toast; 
import android.widget.VideoView; 

import java.io.File; 
import java.sql.Date; 
import java.text.SimpleDateFormat; 
import java.util.Locale; 

import static android.R.attr.data; 

public class MainActivity extends Activity 
{ //activity request codes 
    private static final int CAMERA_CAPTURE_IMAGE_REQUEST_CODE = 100; 
    private static final int CAMERA_CAPTURE_VIDEO_REQUEST_CODE = 200; 
    public static final int MEDIA_TYPE_IMAGE = 1; 
    public static final int MEDIA_TYPE_VIDEO = 2; 

    //directory name to store captured images and videos 
    private static final String IMAGE_DIRECTORY_NAME = "Hello Camera"; 
    private Uri fileUri; //store image video file 

    private ImageView imgPreview; 
    private VideoView videoPreview; 
    private Button btnCapturePicture, btnRecordVideo; 

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

     imgPreview = (ImageView) findViewById(R.id.imgPreview); 
     videoPreview = (VideoView) findViewById(R.id.videoPreview); 
     btnCapturePicture = (Button) findViewById(R.id.btnCapturePicture); 
     btnRecordVideo = (Button) findViewById(R.id.btnRecordVideo); 

     //capture image button click event 
     btnCapturePicture.setOnContextClickListener(View v) 
     { 
      //capture picture 
      captureImage(); 
     } 
      btnRecordVideo.setOnClickListener(View v) 
     { 
      RecordVideo(); 
     } 

      if (isDeviceSupportCamera()) { 
       Toast.makeText(getApplicationContext(), 
         "Sorry! Your device doesent support camera", 
         Toast.LENGTH_LONG).show(); 
       //will closethe app if the device doesent have camera 
       finish(); 
      } 
      } 

     } 
    //checking device for camera 
    private boolean isDeviceSupportCamera() 
    { 
     if (getApplicationContext().getPackageManager().hasSystemFeature(
       PackageManager.FEATURE_CAMERA)) 
     { 
      //THIS DEVICE HAS A CAMERA 
      return true; 
     } else { 
      //no camera on this device 
      return false; 
     } 
    } 

    //capturing camera image will launch amera app request image capture 
    private void captureImage() 
    { 
     Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 

     fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); 
     intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); 

     //start the image capture intent 
     startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE); 
    } 
    // HERE WE store the file uri as it will be null after returning from the app 

    @Override 
    protected void onSaveInstanceState(Bundle outState) 
    { 
     super.onRestoreInstanceState(outState); 

     //save file uri in bundle as it will be null on screen orientation changes 
     outState.putParcelable("file_uri", fileUri); 
    } 

    @Override 
    protected void onRestoreInstanceState(Bundle savedInstanceState) 
    { 
     super.onRestoreInstanceState(savedInstanceState); 

     //get the file uri 
     fileUri = savedInstanceState.getParcelable("file_uri"); 
    } 

    //recording video 
    private void RecordVideo() 
    { 
     Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE); 

     fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO); 
     //set video quality 
     intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1); 

     intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); 

     //start the video capture intent 
     startActivityForResult(intent, CAMERA_CAPTURE_VIDEO_REQUEST_CODE); 
    } 

    //Recieving activity result method will be called after closing the camera 
    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) 
    { //IF THE RESULT IS CAPTURING IMAGE 
     if (requestCode == CAMERA_CAPTURE_IMAGE_REQUEST_CODE) 
     { 
      if (resultCode == RESULT_OK) 
      { 
       //successfully captured the image, displayit in an image view 
       previewCapturedImage(); 
      } else if (resultCode == RESULT_CANCELED) 
      { 
       //user cancelled Image Capture 
       Toast.makeText(getApplicationContext(), 
         "User cancelled image capture", Toast.LENGTH_SHORT).show(); 
      } else { 
       //failed to capture image 
       Toast.makeText(getApplicationContext(), 
         "Sorry! Failed to capture image", Toast.LENGTH_SHORT).show(); 
      } 

     } else if (requestCode == CAMERA_CAPTURE_VIDEO_REQUEST_CODE) 
     { 
      if (requestCode == RESULT_OK) 
      { //VIDEO SUCCESSFULLY RECORDED 
       //prieview the recorded video 
       previewVideo(); 
      } else if (resultCode == RESULT_CANCELED) 
      {//user cancelled recording 
       Toast.makeText(getApplicationContext(), 
         "User cancelled video recording", Toast.LENGTH_SHORT).show(); 
      } else {//failed to record video 
       Toast.makeText(getApplicationContext(), 
         "Sorry! Failed to record video", Toast.LENGTH_SHORT).show(); 
      } 
     } 
    } 

    //display image from a path to imageView 
    private void previewCapturedImage() 
    {//hide video preview 
     try{ 
      //hide video preview 
      videoPreview.setVisibility(View.GONE); 
      imgPreview.setVisibility(View.VISIBLE); 

      BitmapFactory.Options options = new BitmapFactory.Options(); 

      //downsizing image as it throws outof memory exception for larger images 
      options.inSampleSize = 8; 

      final Bitmap bitmap =  BitmapFactory.decodeFile(fileUri.getPath(), options); 

      imgPreview.setImageBitmap(bitmap); 
      } 

     catch(NullPointerException e) 
     { 
      e.printStackTrace(); 
     } 
} 
// previewing recorded video 
private void previewVideo() 
{ 
    try { 
     //hide image preview 
     imgPreview.setVisibility(View.GONE); 
     videoPreview.setVideoPath(fileUri.getPath()); 
     //start p;aying 
     videoPreviewStart(); 
     } catch (Exception e) 
      { 
      e.printStackTrace(); 
      } 
} 

    private void videoPreviewStart() 
    { 

    } 

    //Helper Methods 
    //Creating file uri to store image/video 
    public Uri getOutputMediaFileUri(int type) 
    { 
     return Uri.fromFile(getOutputMediaFile(type)); 
    } 
     //returning image/video 
     private static File getOutputMediaFile(int type) 
{ 
    //external sdcard location 
    File mediaStorageDir = new File(
      Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) 
      IMAGE_DIRECTORY_NAME); 
    //create the storage directory if it does not exist 
    if (!mediaStorageDir.exists()) 
    { 
     if(!mediaStorageDir.mkdir()) 
     { 
      Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create " 
       + IMAGE_DIRECTORY_NAME + " directory"); 
      return null; 
     } 
    } 
     //Create a media file name 
    String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss", 
      Locale.getDefault()).format(new Date()); 
    File mediaFile; 
    if(type == MEDIA_TYPE_IMAGE) 
    { 
     mediaFile = new File (mediaStorageDir.getPath() + File.separator 
     + "IMG" + timeStamp + ".jpg"); 
    } 
     else if (type == MEDIA_TYPE_VIDEO) 
    { 
     mediaFile = new File(mediaStorageDir.getPath() + File.separator 
        + "VID" + timeStamp + ".mp4"); 
    } 
    else 
    { 
     return null; 
    } 
    return mediaFile; 
} 

} 

Answer 1

Проблема заключается в эти строки:

btnRecordVideo.setOnClickListener(View v) { 
    RecordVideo(); 
} 

Вы передаете значение, не создавая метод поэтому он должен быть

btnRecordVideo.setOnClickListener(new OnClickListener() { 
    public void onClick(View v) { 
     //you do your actions here 
     recordVideo(); //Note: only classes start with capitals, not methods 
    } 
}) 

Вы также должны изменить другой линии, где вы допустили подобные ошибки