将文件路径从片段传递到活动，反之亦然

时间：2017-03-02 15:42:15

标签： android android-fragments

我正在制作自己的应用程序，用于练习Android编程。我正在制作一个由3个片段+摘要片段组成的向导，特别是在第三个片段中，用户必须拍摄两张照片，然后将其传递给摘要（以及之前片段中收集的先前数据）。在我没有得到它的地方是我必须回到主要活动并传递图像路径的部分，以便当我点击按钮使我回到摘要片段时调用它们。

以下是代码：

MainActivity.java 

public class MainActivity extends AppCompatActivity {

    private Button personalData;
    protected String strUsername;
    private boolean isProfileReady;
    protected SharedPreferences loginData;

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

        TextView welcome = (TextView) findViewById(R.id.welcome);
        personalData = (Button) findViewById(R.id.data);
        personalData.setText("Profile Info");
        personalData.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, WizardActivity.class);
                intent.putExtra("profileReady", isProfileReady);
                startActivityForResult(intent, 1);
            }
        });
        loginData = getSharedPreferences("UserPrefs", MODE_PRIVATE);
        String value = loginData.getString("Username", null);
        if (value == null) {
            welcome.setText("Welcome guest!");
            personalData.setVisibility(View.INVISIBLE);
        } else {
            welcome.setText("Welcome " + loginData.getString("Username", strUsername) + "!");
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if (resultCode == RESULT_OK) {
            isProfileReady = true;
            personalData.setText("View Profile");
        }

    }
}

WizardActivity.java 

public class WizardActivity extends AppCompatActivity implements SummaryFragment.Images {

    //region Variables
    Button go;
    WizardOne wizOne;
    WizardTwo wizTwo;
    WizardThree wizThree;
    SummaryFragment summaryFragment;
    Bitmap frontBitmap, backBitmap;
    SharedPreferences wizardPrefs;
    Bundle bundle = new Bundle();

    int currentPage = 1;

    public static final String FRONT_BITMAP_KEY = "frontBitmap", BACK_BITMAP_KEY = "backBitmap";

    boolean isProfileReady;
    //endregion

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

        isProfileReady = getIntent().getBooleanExtra("profileReady", false);

        Toast.makeText(this, "profileReady : " + isProfileReady, Toast.LENGTH_SHORT).show();

        setContentView(R.layout.wizard_layout);
        go = (Button) findViewById(R.id.go);

        if (isProfileReady) {
            /*bundle.getParcelable("frontBitmap");
            bundle.getParcelable("backBitmap");*/
            currentPage = 4;
            go.setText("Home");
            summaryFragment = new SummaryFragment();
            summaryFragment.setArguments(bundle);
     getSupportFragmentManager().beginTransaction().add(R.id.activity_layout, summaryFragment).commit();
        } else {
            wizOne = new WizardOne();
            if (savedInstanceState == null)
                getSupportFragmentManager().beginTransaction().add(R.id.activity_layout, wizOne).commit();
        }

        go.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (isProfileReady) {
                    Intent intent = new Intent();
                    setResult(RESULT_OK, intent);
                    finish();
                } else {
                    nextFragment();
                }
            }
        });
    }

    public void nextFragment() {

        switch (currentPage) {

            case 1:
                if (wizOne.validate()) {
                    wizTwo = new WizardTwo();
                    changeFragment(wizTwo, R.id.activity_layout);
                    currentPage++;
                } else {
                    Toast.makeText(getApplicationContext(), "Fill the fields", Toast.LENGTH_SHORT).show();
                }
                break;

            case 2:
                if (wizTwo.validate()) {
                    wizThree = new WizardThree();
                    changeFragment(wizThree, R.id.activity_layout);
                    currentPage++;
                } else {
                    Toast.makeText(getApplicationContext(), "Fill the fields", Toast.LENGTH_SHORT).show();
                }
                break;

            case 3:
                if (wizThree.validate()) {
                    bundle.putParcelable("frontBitmap", wizThree.getFrontBitmap());
                    bundle.putParcelable("backBitmap", wizThree.getBackBitmap());
                    summaryFragment = new SummaryFragment();
                    summaryFragment.setArguments(bundle);
                    go.setText("Home");
                    changeFragment(summaryFragment, R.id.activity_layout);
                    currentPage++;
                }
                break;

            case 4:
                passImages();
                setResult(RESULT_OK);
                finish();
                break;

            default:
                break;

        }
    }


    public void changeFragment(ValidateFragment f, int resource) {

        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.replace(resource, f);
        transaction.addToBackStack(null);
        transaction.commit();

    }

    public Bitmap getFrontBitmap() {
        return frontBitmap;
    }

    public Bitmap getBackBitmap() {
        return backBitmap;
    }

    @Override
    public void onBackPressed() {

        if (currentPage > 1) {
            currentPage--;
            getSupportFragmentManager().popBackStack();
        } else {
            super.onBackPressed();
        }

    }

    @Override
    public Bundle passImages() {
        bundle.getParcelable("frontBitmap");
        bundle.getParcelable("backBitmap");
        return bundle;
    }
}

WizardThree.java 

public class WizardThree extends ValidateFragment {

    Button photos, deleteFirst, deleteSecond, button;
    TextView frontText, backText, textView;
    ImageView frontPhoto, backPhoto, imageView;
    static final int REQUEST_IMAGE_CAPTURE = 1;
    String path;
    File photo = null;
    Uri photoURI_1, photoURI_2, uri, uriOut;

    private Bitmap frontBitmap, backBitmap;

    public WizardThree() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_wizard_three, container, false);
        photos = (Button) v.findViewById(R.id.photos);
        photos.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent capture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                if (capture.resolveActivity(getActivity().getPackageManager()) != null) {
                    try {
                        photo = createImgFile();
                    } catch (IOException e) {
                        Log.d("No,", " non funziona");
                    }
                    if (photo != null) {
                        uriOut = FileProvider.getUriForFile(WizardThree.this.getContext(), "com.example.android.fileprovider", photo);
                        capture.putExtra(MediaStore.EXTRA_OUTPUT, uriOut);
                        startActivityForResult(capture, REQUEST_IMAGE_CAPTURE);
                    }
                }
            }
        });
        frontText = (TextView) v.findViewById(R.id.frontText);
        frontPhoto = (ImageView) v.findViewById(R.id.frontPhoto);
        deleteFirst = (Button) v.findViewById(R.id.deleteFirst);
        deleteFirst.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                deletePhoto(frontPhoto, frontText, deleteFirst);
            }
        });
        backText = (TextView) v.findViewById(R.id.backText);
        backPhoto = (ImageView) v.findViewById(R.id.backPhoto);
        deleteSecond = (Button) v.findViewById(R.id.deleteSecond);
        deleteSecond.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                deletePhoto(backPhoto, backText, deleteSecond);
            }
        });
        return v;
    }

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

        if (requestCode == REQUEST_IMAGE_CAPTURE) {
            if (frontPhoto.getDrawable() == null) {
                photoURI_1 = uriOut;
                frontBitmap = putPhoto(frontPhoto, frontText, deleteFirst, photoURI_1);
                checkButton();
            } else if (backPhoto.getDrawable() == null) {
                photoURI_2 = uriOut;
                backBitmap = putPhoto(backPhoto, backText, deleteSecond, photoURI_2);
                checkButton();
            }
        }
    }

    //region getBitmaps
    public Bitmap getFrontBitmap() {
        return frontBitmap;
    }

    public Bitmap getBackBitmap() {
        return backBitmap;
    }
    //endregion

    public Bitmap putPhoto(ImageView imageView, TextView textView, Button button, Uri uri) {
        Bitmap bitmap = BitmapFactory.decodeFile(path);
        bitmap = Bitmap.createScaledBitmap(bitmap, bitmap.getWidth() / 3, bitmap.getHeight() / 3, true);
        imageView.setImageBitmap(bitmap);
        textView.setVisibility(View.VISIBLE);
        imageView.setVisibility(View.VISIBLE);
        button.setVisibility(View.VISIBLE);
        return bitmap;
    }

    public void checkButton() {
        if ((frontPhoto.getDrawable() != null) && (backPhoto.getDrawable() != null)) {
            photos.setEnabled(false);
        } else {
            photos.setEnabled(true);
        }
    }

    private File createImgFile() throws IOException {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imgName = "JPEG_" + timeStamp + "_";
        File storage = getActivity().getExternalFilesDir(Environment.DIRECTORY_PICTURES);
        File img = File.createTempFile(imgName, ".jpg", storage);
        path = img.getAbsolutePath();
        return img;
    }

    public void deletePhoto(ImageView imageView, TextView text, Button btn) {
        imageView.setImageDrawable(null);
        text.setVisibility(View.GONE);
        btn.setVisibility(View.GONE);
        checkButton();
    }

    @Override
    public void onDetach() {
        super.onDetach();
    }

    @Override
    public boolean validate() {
        if ((frontPhoto.getDrawable() == null) || (backPhoto.getDrawable() == null)) {
            Toast.makeText(getContext(), "Both photos are necessary", Toast.LENGTH_SHORT).show();
            return false;
        }

SummaryFragment.java 

public class SummaryFragment extends ValidateFragment {

    //region Variables
    TextView getFName, getLName, getFisCode, getBirth, getCity, getProv, getZip, getCC, getIban, getMail;
    ImageView imgOne, imgTwo;
    String strFName, strLName, strFisCode, strBirth, strCity, strZip, strProv, strCC, strIban, strMail, path;
    SharedPreferences wizardPrefs;
    private Bitmap frontBitmap = null;
    private Bitmap backBitmap = null;
    Uri uri;
    Images callBack;
    //endregion

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        frontBitmap = getArguments().getParcelable("frontBitmap");
        backBitmap = getArguments().getParcelable("backBitmap");
    }

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

        //region findViewById
        getFName = (TextView) v.findViewById(R.id.getFName);
        getLName = (TextView) v.findViewById(R.id.getLName);
        getFisCode = (TextView) v.findViewById(R.id.getFisCode);
        getBirth = (TextView) v.findViewById(R.id.getBirth);
        getCity = (TextView) v.findViewById(R.id.getCity);
        getProv = (TextView) v.findViewById(R.id.getProv);
        getZip = (TextView) v.findViewById(R.id.getZip);
        getCC = (TextView) v.findViewById(R.id.getCC);
        getIban = (TextView) v.findViewById(R.id.getIban);
        getMail = (TextView) v.findViewById(R.id.getMail);
        imgOne = (ImageView) v.findViewById(R.id.imgOne);
        imgTwo = (ImageView) v.findViewById(R.id.imgTwo);
        //endregion

        wizardPrefs = this.getActivity().getSharedPreferences("USERDATA", Context.MODE_PRIVATE);
        getFName.setText(wizardPrefs.getString("Nome utente", strFName));
        getLName.setText(wizardPrefs.getString("Cognome utente", strLName));
        getFisCode.setText(wizardPrefs.getString("Codice Fiscale", strFisCode));
        getBirth.setText(wizardPrefs.getString("Data di nascita", strBirth));
        getCity.setText(wizardPrefs.getString("Città", strCity));
        getZip.setText(wizardPrefs.getString("CAP", strZip));
        getProv.setText(wizardPrefs.getString("Provincia", strProv));
        getCC.setText(wizardPrefs.getString("CC", strCC));
        getIban.setText(wizardPrefs.getString("IBAN", strIban));
        getMail.setText(wizardPrefs.getString("E-mail", strMail));
        imgOne.setImageBitmap(frontBitmap);
        imgTwo.setImageBitmap(backBitmap);

        return v;
    }

    @Override
    public boolean validate() {
        return false;
    }

    public Bitmap getFrontBitmap() {
        return frontBitmap;
    }

    public Bitmap getBackBitmap() {
        return backBitmap;
    }

    public interface Images {
        Bundle passImages();
    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        try {
            callBack = (Images) context;
        } catch (ClassCastException c) {
            throw new ClassCastException(context.toString() + "Exception thrown");
        }

    }

}
            return true;
        }

    }

任何人都可以帮我搞清楚吗？

2 个答案:

答案 0 :(得分：0)

您已经拥有onActivityResult，所以：

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

    if (resultCode == RESULT_OK) {
        isProfileReady = true;
        String imageOne = data.getStringExtra("imageOne");
    }
}

在SummaryFragment中，您需要执行以下操作：

Intent intent = new Intent();

intent.putExtra("ImageOne", imageOne);
setResult(RESULT_OK, intent);

finish();

答案 1 :(得分：0)

您可以使用片段中的共享首选项，然后在刚刚读取的活动中使用。这样就不会在片段和活动之间产生紧密耦合。

从这里读到很好的例子。 https://developer.android.com/training/basics/data-storage/shared-preferences.html

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