用相机捕捉图像 &上传到 Firebase(onActivityResult() 中的 Uri 为空) [英] Image capture with camera & upload to Firebase (Uri in onActivityResult() is null)
问题描述
所以我遇到了一个问题,之前在我提出的问题中提到过:将图片 (ACTION_IMAGE_CAPTURE) 上传到 Firebase 存储
So I've got a problem, previously mentioned in the question I've asked: Uploading image (ACTION_IMAGE_CAPTURE) to Firebase storage
我搜索了更多问题,并应用了 Android Studio 文档:https://developer.android.com/training/camera/photobasics.html#TaskPhotoView
I've searched for the issue a bit more, and applied the Android Studio documentation: https://developer.android.com/training/camera/photobasics.html#TaskPhotoView
所以,在你阅读代码之前,我基本上想说需要什么:我只想用相机拍一张照片,然后直接上传到 Firebase 存储.为此,我需要 Uri 来包含我刚刚拍摄的图片 (Uri.getLastPathSegment()),但是我仍然无法成功执行此操作.
So, before you read the code, I basically want to say what is needed: I just want to capture a photo with camera and upload it directly to Firebase storage. To do that I need the Uri to contain the picture I just took (Uri.getLastPathSegment()), however I still couldn't succeed doing this.
现在,这就是我的代码的样子(仅相关部分):AndroidManifest.xml:
So now, this is what my code look like (only related parts): AndroidManifest.xml:
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="com.example.android.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths"></meta-data>
</provider>
我有 res/xml/file_paths.xml:
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<external-path name="my_images" path="Android/data/com.serjardovic.firebasesandbox/files/Pictures" />
</paths>
最后是MainActivity.java:
public class MainActivity extends AppCompatActivity {
private Button b_gallery, b_capture;
private ImageView iv_image;
private StorageReference storage;
private static final int GALLERY_INTENT = 2;
private static final int CAMERA_REQUEST_CODE = 1;
private ProgressDialog progressDialog;
String mCurrentPhotoPath;
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = getExternalFilesDir(Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = image.getAbsolutePath();
return image;
}
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File...
}
// Continue only if the File was successfully created
if (photoFile != null) {
Uri photoURI = FileProvider.getUriForFile(this,
"com.example.android.fileprovider",
photoFile);
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, photoURI);
startActivityForResult(takePictureIntent, CAMERA_REQUEST_CODE);
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
storage = FirebaseStorage.getInstance().getReference();
b_gallery = (Button) findViewById(R.id.b_gallery);
b_capture = (Button) findViewById(R.id.b_capture);
iv_image = (ImageView) findViewById(R.id.iv_image);
progressDialog = new ProgressDialog(this);
b_capture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
dispatchTakePictureIntent();
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == CAMERA_REQUEST_CODE && resultCode == RESULT_OK){
progressDialog.setMessage("Uploading...");
progressDialog.show();
Uri uri = data.getData();
StorageReference filepath = storage.child("Photos").child(uri.getLastPathSegment());
filepath.putFile(uri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Toast.makeText(MainActivity.this, "Upload Successful!", Toast.LENGTH_SHORT).show();
progressDialog.dismiss();
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(MainActivity.this, "Upload Failed!", Toast.LENGTH_SHORT).show();
}
});
}
}
}
需要一个解决方案!尽管如此,应用程序在我拍照并按下确认按钮后崩溃,我收到以下崩溃报告:
Need a solution! Still, the app crashes after I take the picture and press the confirm button and I get the following crash report:
java.lang.RuntimeException: 将结果 ResultInfo{who=null, request=1, result=-1, data=null} 传递给活动 {com.serjardovic.firebasesandbox/com.serjardovic.firebasesandbox.MainActivity} 失败:java.lang.NullPointerException:尝试在空对象引用上调用虚拟方法android.net.Uri android.content.Intent.getData()"
java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=null} to activity {com.serjardovic.firebasesandbox/com.serjardovic.firebasesandbox.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.net.Uri android.content.Intent.getData()' on a null object reference
推荐答案
尝试将 mCurrentPhotoPath = image.getAbsolutePath();
更改为 mCurrentPhotoPath = "file:" + image.getAbsolutePath();代码>.我没有发现我的代码有任何其他差异,这已经奏效了.
Try changing mCurrentPhotoPath = image.getAbsolutePath();
to mCurrentPhotoPath = "file:" + image.getAbsolutePath();
.
I didnt spot any other differences from my code, which has worked.
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