java - android setOnClickListener (v) 无法解析 'v'

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我是 Android 新手，我正在尝试让监听器同时录制视频和捕获图片。它一直给我一个无法解析“v”错误，而且我在时间戳方面也遇到了麻烦，无法让它识别日期。我尝试过切换和启用不同的 API 10、23 和 25。此版本的应用程序当前正在运行 23，以尝试解决我的监听器问题。任何帮助将不胜感激。

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

问题是这些行:

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

您正在传递一个值，而不是创建一个方法，所以它应该是

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

您还必须更改犯过类似错误的其他行