Question

我要做的是捕获图像并在图像视图中查看它并将其存储到firebase存储中。

我的代码：

public class WaterConsumptionPage extends Fragment {

private ImageView imageView;
private Button capture, upload;
static final int CAM_REQUEST = 1;
private StorageReference mStorageRef;
private FirebaseAuth mAuth;
private DatabaseReference dbRef;
private ProgressDialog mProgress;
private Bitmap photo;
private FirebaseUser user;
private Uri uri;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.water_consumption_page, container, false);

    mStorageRef = FirebaseStorage.getInstance().getReference();
    mAuth = FirebaseAuth.getInstance();
    dbRef = FirebaseDatabase.getInstance().getReference();
    user = mAuth.getCurrentUser();

    imageView = rootView.findViewById(R.id.water_image);
    capture = rootView.findViewById(R.id.water_capture);
    upload = rootView.findViewById(R.id.water_upload);

    upload.setEnabled(false);

    capture.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent cam_intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            if(cam_intent.resolveActivity(getActivity().getPackageManager()) != null){
                startActivityForResult(cam_intent, CAM_REQUEST);
            }
        }
    });

    mProgress = new ProgressDialog(getContext());
    upload.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mProgress.setMessage("Uploading Image...");
            mProgress.show();

            StorageReference filepath = mStorageRef.child("Photos").child(user.getUid()).child("Water").child(uri.getLastPathSegment());
            filepath.putFile(uri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
                @Override
                public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
                    mProgress.dismiss();
                    Toast.makeText(getContext(), "Upload Finished...", Toast.LENGTH_LONG).show();
                    Intent i = new Intent(getContext(), WaterConsumption.class);
                    startActivity(i);
                }
            }).addOnFailureListener(new OnFailureListener() {
                @Override
                public void onFailure(@NonNull Exception e) {
                    mProgress.dismiss();
                    Toast.makeText(getContext(), "Upload has stopped.", Toast.LENGTH_LONG).show();
                }
            });
        }
    });

    return rootView;
}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if(requestCode == CAM_REQUEST && data != null){
        upload.setEnabled(true);
        uri = data.getData();
        Bundle extras = data.getExtras();
        photo = (Bitmap) extras.get("data");
        imageView.setImageBitmap(photo);

    }
}

错误：

E / AndroidRuntime：致命异常：主要处理：com.example.akoni.conread，PID：13901 java.lang.NullPointerException：尝试在空对象引用上调用虚方法'java.lang.String android.net.Uri.getLastPathSegment（）' 在com.example.akoni.conread.WaterConsumptionPage $ 2.onClick（WaterConsumptionPage.java:87）在android.view.View.performClick（View.java:5265）在android.view.View $ PerformClick.run（View.java:21534）在android.os.Handler.handleCallback（Handler.java:815）在android.os.Handler.dispatchMessage（Handler.java:104）在android.os.Looper.loop（Looper.java:207）在android.app.ActivityThread.main（ActivityThread.java:5728） at java.lang.reflect.Method.invoke（Native Method）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:789）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:679）

我还尝试将此代码放在 onActivityResult（）中，以测试我是否可以保存图像，但我还有另一个错误（如下所示）。

StorageReference filepath = mStorageRef.child("Photos").child(user.getUid()).child("Water").child(uri.getLastPathSegment());
filepath.putFile(uri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
        @Override
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
               mProgress.dismiss();
               Toast.makeText(getContext(), "Upload Finished...", Toast.LENGTH_LONG).show();
               Intent i = new Intent(getContext(), WaterConsumption.class);
                    startActivity(i);
                }
        }).addOnFailureListener(new OnFailureListener() {
              @Override
              public void onFailure(@NonNull Exception e) {
                  mProgress.dismiss();
                  Toast.makeText(getContext(), "Upload has stopped.", Toast.LENGTH_LONG).show();
              }
});

错误：

E / AndroidRuntime：致命异常：主要处理：com.example.akoni.conread，PID：14526 java.lang.RuntimeException：将结果ResultInfo {who = null，request = 65537，result = -1，data = Intent {act = inline-data（has extras）}}传递给activity {com.example.akoni.conread / com.example.akoni.conread.TabMenu}：java.lang.NullPointerException：尝试在空对象引用上调用虚方法'java.lang.String android.net.Uri.getLastPathSegment（）' 在android.app.ActivityThread.deliverResults（ActivityThread.java:3929）在android.app.ActivityThread.handleSendResult（ActivityThread.java:3972）在android.app.ActivityThread.-wrap16（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1537）在android.os.Handler.dispatchMessage（Handler.java:111）在android.os.Looper.loop（Looper.java:207）在android.app.ActivityThread.main（ActivityThread.java:5728） at java.lang.reflect.Method.invoke（Native Method）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:789）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:679）引起：java.lang.NullPointerException：尝试在空对象引用上调用虚方法'java.lang.String android.net.Uri.getLastPathSegment（）' 在com.example.akoni.conread.WaterConsumptionPage.onActivityResult（WaterConsumptionPage.java:120）在android.support.v4.app.FragmentActivity.onActivityResult（FragmentActivity.java:151）在android.app.Activity.dispatchActivityResult（Activity.java:6502）在android.app.ActivityThread.deliverResults（ActivityThread.java:3925）在android.app.ActivityThread.handleSendResult（ActivityThread.java:3972）在android.app.ActivityThread.-wrap16（ActivityThread.java）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1537）在android.os.Handler.dispatchMessage（Handler.java:111）在android.os.Looper.loop（Looper.java:207）在android.app.ActivityThread.main（ActivityThread.java:5728） at java.lang.reflect.Method.invoke（Native Method）在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:789）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:679）

我想捕获图像并首先将其查看到ImageView ，然后点击upload将图像保存到firebase。

Answer 1

你应该删除这行代码：

super.onActivityResult(requestCode, resultCode, data);

因为我认为这一行会导致data.getIntent（）没有返回任何内容。

如果可以，您还应该检查resultCode。这是一个例子：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == CAM_REQUEST && resultCode == RESULT_OK) {
       Uri uri = data.getData();
    } 
  }

捕获后上传图片 - Android

1 个答案: