Как открыть переднюю камеру в приложении для Android

-6

Я создаю приложение, в котором я использую переднюю камеру. Пожалуйста, расскажите мне, как открыть переднюю камеру при нажатии на кнопку, используя следующий код. Мое приложение разбилось, когда я нажимаю кнопку, чтобы открыть камеру.

public class MakePhotoActivity extends Activity {

// LogCat tag
private static final String TAG = MainActivity.class.getSimpleName();

// Camera 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;

private Uri fileUri; // file url to store image/video

private Button btnCapturePicture, btnRecordVideo;

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

// Changing action bar background color
// These two lines are not needed
// getActionBar().setBackgroundDrawable(new ColorDrawable(Color.parseColor(getResources().getString(R.color.action_bar))));

btnCapturePicture = (Button) findViewById(R.id.btnCapturePicture);
btnRecordVideo = (Button) findViewById(R.id.btnRecordVideo);

/**
* Capture image button click event
*/
btnCapturePicture.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// capture picture
captureImage();
}
});

/**
* Record video button click event
*/
btnRecordVideo.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// record video
recordVideo();
}
});

// Checking camera availability
if (!isDeviceSupportCamera()) {
Toast.makeText(getApplicationContext(),
"Sorry! Your device doesn't support camera",
Toast.LENGTH_LONG).show();
// will close the app if the device does't have camera
finish();
}
}

/**
* Checking device has camera hardware or not
* */
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;
}
}

/**
* Launching camera app to capture image
*/
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
//intent.putExtra("android.intent.extras.CAMERA_FACING", 1);
startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);

}

/**
* Launching camera app to record 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); // set the image file
// name

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

/**
* Here we store the file url as it will be null after returning from camera
* app
*/
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);

// save file url 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 url
fileUri = savedInstanceState.getParcelable("file_uri");
}

/**
* Receiving 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
// launching upload activity
launchUploadActivity(true);

} 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 (resultCode == RESULT_OK) {

// video successfully recorded
// launching upload activity
launchUploadActivity(false);

} 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();
}
}
}

private void launchUploadActivity(boolean isImage){
/* Intent i = new Intent(MakePhotoActivity.this, UploadActivity.class);
i.putExtra("filePath", fileUri.getPath());
i.putExtra("isImage", isImage);
startActivity(i);*/
}

/**
* ------------ 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),
Config.IMAGE_DIRECTORY_NAME);

// Create the storage directory if it does not exist
if (!mediaStorageDir.exists()) {
if (!mediaStorageDir.mkdirs()) {
Log.d(TAG, "Oops! Failed create " + Config.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 {

return null;
}

return mediaFile;
}
}

когда я нажимаю кнопку, чтобы открыть приложение для камеры, разбился. я получаю эту ошибку

07-12 14: 02: 50.028 15360-15360/com.camerimageuploadd E/AndroidRuntime: FATAL> EXCEPTION: main

Процесс: com.camerimageuploadd, PID: 15360 java.lang.NullPointerException: файл на android.net.Uri.fromFile(Uri.java:453) на com.camerimageuploadd.MakePhotoActivity.getOutputMediaFileUri(MakePhotoActivity.java:228) на com.camerimageuploadd.MakePhotoActivity.captureImage(MakePhotoActivity.java:110) на com.camerimageuploadd.MakePhotoActivity.access $ 000 (MakePhotoActivity.java:27) на com.camerimageuploadd.MakePhotoActivity $ 1.onClick(MakePhotoActivity.java:64) на android.view.View. выполните командуClick (View.java:6294) в android.view.View $ PerformClick.run(View.java:24770) в файле android.os.Handler.handleCallback(Handler.java:790) в android.os.Handler.dispatchMessage (Обработчик.java: 99) на android.os.Looper.loop(Looper.java:164) на android.app.ActivityThread.main(ActivityThread.java:6494) в java.lang.reflect.Method.invoke (собственный метод) на com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run(RuntimeInit.java:438) в com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

Пожалуйста, помогите, как я могу это решить.

Спасибо

спросил(а) 2020-04-04T00:02:25+03:00 5 месяцев, 4 недели назад
1
Решение
81

его исключение null ponter, потому что ваш код пытается получить файл, который еще не захвачен камерой

 fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);

а также

fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO);

Я предлагаю использовать эти обе строки в onActivityResult

ваши обновленные методы

private void captureImage() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
}

а также

 private void recordVideo() {
Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult(intent, CAMERA_CAPTURE_VIDEO_REQUEST_CODE);
}

Ваш OnActivityResult

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) {
fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
Toast.makeText(getApplicationContext(),""+fileUri,Toast.LENGTH_LONG).show();
// fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
// successfully captured the image
// launching upload activity
launchUploadActivity(true);

} 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 (resultCode == RESULT_OK) {
fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO);
Toast.makeText(getApplicationContext(),""+fileUri,Toast.LENGTH_LONG).show();
// video successfully recorded
// launching upload activity
launchUploadActivity(false);

} 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();
}
}
}

ответил(а) 2020-04-04T00:14:31.286326+03:00 5 месяцев, 4 недели назад
Ваш ответ
Введите минимум 50 символов
Чтобы , пожалуйста,
Выберите тему жалобы:

Другая проблема