问题
I am new at android as well as parse.com. I need a way in which a user can click a button to take a photo or another button to choose a photo from the gallery. Then store the image in my parse.com database so that I can manipulate it with other events in the system. So far I am able to have the user update his status and save to my parse database but I do not know how to manipulate images and ImageViews. Here is my code so far:
public class UpdateActivity extends Activity {
protected EditText mUpdateStatus;
protected Button mUpdateStatusButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_update);
//initialization of variables
mUpdateStatus=(EditText)findViewById(R.id.updateStatusUpdate);
mUpdateStatusButton=(Button)findViewById(R.id.updateButtonUpdate);
//code update button click event
mUpdateStatusButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Get current user
ParseUser currentUser=ParseUser.getCurrentUser();//Identifies current user
String currentUserUsername=currentUser.getUsername();//stores username in variable
//Create new variable to store strings
String newStatus=mUpdateStatus.getText().toString();
//Event for an empty status
if (newStatus.isEmpty())
{AlertDialog.Builder builder=new AlertDialog.Builder(UpdateActivity.this);
builder.setMessage("STATUS SHOULD NOT BE EMPTY.");
builder.setTitle("OOPS!");
builder.setPositiveButton("OK",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog dialog=builder.create();
dialog.show();}
else{
//Save the status in Parse.com
ParseObject statusObject = new ParseObject("Status");//Create a new parse class
statusObject.put("newStatus",newStatus);//Creates a new attribute and adds value from newStatus
statusObject.put("User",currentUserUsername);//Stores username in new parse class
//Save data and initiate callback method
statusObject.saveInBackground(new SaveCallback() {
@Override
public void done(ParseException e) {
if(e==null)
{//Event for a Successful storage
Toast.makeText(UpdateActivity.this,getString(R.string.succssfulUpdate),Toast.LENGTH_LONG).show();
//Take user back to profile
Intent main = new Intent(UpdateActivity.this, ProfileActivity.class);
UpdateActivity.this.startActivity(main);
}
else
{//Event for an Unsuccessful storage
AlertDialog.Builder builder=new AlertDialog.Builder(UpdateActivity.this);
builder.setMessage(e.getMessage());
builder.setTitle("SORRY!");
builder.setPositiveButton("OK",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog dialog=builder.create();
dialog.show();
}
}
});}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_update, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
switch(id) {
case R.id.logoutUpdateMenu:
{//logout the user
ParseUser.logOut();
//Take user back to login
Intent intent = new Intent(UpdateActivity.this, LoginActivity.class);
UpdateActivity.this.startActivity(intent);
UpdateActivity.this.finish();
Toast.makeText(getApplicationContext(), getString(R.string.logout_text), Toast.LENGTH_LONG).show();
break;}
}
return super.onOptionsItemSelected(item);
}
}
回答1:
I have no experience with parse.com but If you are able to put images(bit map) into ParseObject, you just need to call take photo or pick photo action using intent and startActivityForResult. Example:
public void onClickTakePhoto(View view) {
dispatchTakePictureIntent();
}
public void onClickPickPhoto(View view) {
Intent i = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, REQUEST_SELECT_IMAGE);
}
//Code from Android documentation
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if ((requestCode == REQUEST_IMAGE_CAPTURE || requestCode == REQUEST_SELECT_IMAGE) && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
ParseObject statusObject = new ParseObject("Status");
//I think parse has similar support If not this
statusObject.put("profile_photo",imageBitmap);
statusObject.saveInBackground( new Callback(){...});
}
}
回答2:
A complete example image upload for Parse.com with option to take a photo gallery or the camera.
Activity.class
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.MediaStore;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.parse.ParseException;
import com.parse.ParseFile;
import com.parse.ParseObject;
import com.parse.SaveCallback;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
public class MainActivity extends ActionBarActivity {
private static int RESULT_LOAD_CAMERA_IMAGE = 2;
private static int RESULT_LOAD_GALLERY_IMAGE = 1;
private String mCurrentPhotoPath;
private ImageView imgPhoto;
private Button btnUploadImage;
private File cameraImageFile;
private TextView mTextView;
@Override
public void onActivityResult (int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK) {
if (requestCode == RESULT_LOAD_GALLERY_IMAGE && null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(selectedImage,filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
mCurrentPhotoPath = cursor.getString(columnIndex);
cursor.close();
} else if (requestCode == RESULT_LOAD_CAMERA_IMAGE) {
mCurrentPhotoPath = cameraImageFile.getAbsolutePath();
}
File image = new File(mCurrentPhotoPath);
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeFile(image.getAbsolutePath(), bmOptions);
imgPhoto.setImageBitmap(bitmap);
}
}
private File createImageFile () throws IOException {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
File folder = new File(storageDir.getAbsolutePath() + "/PlayIOFolder");
if (!folder.exists()) {
folder.mkdir();
}
cameraImageFile = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
folder /* directory */
);
return cameraImageFile;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imgPhoto = (ImageView)findViewById(R.id.imgPhoto);
imgPhoto.setOnClickListener(chooseImageListener);
btnUploadImage = (Button)findViewById(R.id.btnUpload);
btnUploadImage.setOnClickListener(uploadListener);
}
View.OnClickListener chooseImageListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
dialogChooseFrom();
}
};
View.OnClickListener uploadListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
byte[] image = null;
try {
image = readInFile(mCurrentPhotoPath);
}
catch(Exception e) {
e.printStackTrace();
}
// Create the ParseFile
ParseFile file = new ParseFile("picturePath", image);
// Upload the image into Parse Cloud
file.saveInBackground();
// Create a New Class called "ImageUpload" in Parse
ParseObject imgupload = new ParseObject("Image");
// Create a column named "ImageName" and set the string
imgupload.put("Image", "picturePath");
// Create a column named "ImageFile" and insert the image
imgupload.put("ImageFile", file);
// Create the class and the columns
imgupload.saveInBackground(new SaveCallback() {
@Override
public void done(ParseException e) {
Toast.makeText(getBaseContext(), "Done!", Toast.LENGTH_LONG).show();
}
});
}
};
private void dialogChooseFrom(){
final CharSequence[] items={"From Gallery","From Camera"};
AlertDialog.Builder chooseDialog =new AlertDialog.Builder(this);
chooseDialog.setTitle("Pick your choice").setItems(items, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if(items[which].equals("From Gallery")){
Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(galleryIntent, RESULT_LOAD_GALLERY_IMAGE);
} else {
try {
File photoFile = createImageFile();
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT,Uri.fromFile(photoFile));
startActivityForResult(cameraIntent, RESULT_LOAD_CAMERA_IMAGE);
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
chooseDialog.show();
}
private byte[] readInFile(String path) throws IOException {
byte[] data = null;
File file = new File(path);
InputStream input_stream = new BufferedInputStream(new FileInputStream(file));
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
data = new byte[16384]; // 16K
int bytes_read;
while ((bytes_read = input_stream.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, bytes_read);
}
input_stream.close();
return buffer.toByteArray();
}
}
Layout
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<RelativeLayout
android:layout_marginTop="20dp"
android:layout_centerHorizontal="true"
android:layout_width="200dp"
android:layout_height="200dp"
android:background="#ccc">
<ImageView
android:id="@+id/imgPhoto"
android:layout_width="200dp"
android:layout_height="200dp"
/>
<TextView
android:text="Choose a image"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:layout_margin="2dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
<Button
android:id="@+id/btnUpload"
android:text="Upload Photo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
Android Manifest
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
回答3:
You need to convert your Bitmap or any Object into byte[].
And then use following code.
byte[] image= your byte array
final ParseFile files = new ParseFile(image);
files.saveInBackground(new SaveCallback() {
@Override
public void done(ParseException exception) {
if (exception == null) {
ParseUser.getCurrentUser().put("<parse-column-name>", files);
ParseUser.getCurrentUser().saveInBackground();
}
}
});
Hope this helps.
来源：https://stackoverflow.com/questions/28852110/parse-com-android-how-do-i-save-images-to-my-parse-database-so-that-i-can-use