I want to let the user either choose a picture from Gallery or take a picture using Camera when clicking on the image view. I followed several tutorials online, and here is my attempt:
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
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.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.Toast;
public class UploadImageActivity extends Activity {
private final int CAMERA_PICTURE = 1;
private final int GALLERY_PICTURE = 2;
private ImageView userPictureImageView;
private Intent pictureActionIntent = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
userPictureImageView = (ImageView) findViewById(R.id.image_view);
userPictureImageView.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
startDialog();
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == GALLERY_PICTURE) {
Uri uri = data.getData();
if (uri != null) {
// User had pick an image.
Cursor cursor = getContentResolver().query(uri, new String[] { android.provider.MediaStore.Images.ImageColumns.DATA }, null, null, null);
cursor.moveToFirst();
// Link to the image
final String imageFilePath = cursor.getString(0);
File photos = new File(imageFilePath);
Bitmap b = decodeFile(photos);
b = Bitmap.createScaledBitmap(b, 150, 150, true);
userPictureImageView.setImageBitmap(b);
cursor.close();
}
else {
Toast toast = Toast.makeText(this, "No Image is selected.", Toast.LENGTH_LONG);
toast.show();
}
}
else if (requestCode == CAMERA_PICTURE) {
if (data.getExtras() != null) {
// here is the image from camera
Bitmap bitmap = (Bitmap) data.getExtras().get("data");
userPictureImageView.setImageBitmap(bitmap);
}
}
}
private Bitmap decodeFile(File f) {
try {
// decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f), null, o);
// Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE = 70;
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < REQUIRED_SIZE || height_tmp / 2 < REQUIRED_SIZE)
break;
width_tmp /= 2;
height_tmp /= 2;
scale++;
}
// decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
}
catch (FileNotFoundException e) {
}
return null;
}
private void startDialog() {
AlertDialog.Builder myAlertDialog = new AlertDialog.Builder(this);
myAlertDialog.setTitle("Upload Pictures Option");
myAlertDialog.setMessage("How do you want to set your picture?");
myAlertDialog.setPositiveButton("Gallery", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
pictureActionIntent = new Intent(Intent.ACTION_GET_CONTENT, null);
pictureActionIntent.setType("image/*");
pictureActionIntent.putExtra("return-data", true);
startActivityForResult(pictureActionIntent, GALLERY_PICTURE);
}
});
myAlertDialog.setNegativeButton("Camera", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {
pictureActionIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(pictureActionIntent, CAMERA_PICTURE);
}
});
myAlertDialog.show();
}
}
The Camera works fine, but the Gallery doesn't work at all. It kept crashing for some reasons, could anyone shed me a light? Thanks.
EDIT
Error Log
11-14 01:09:30.566: E/AndroidRuntime(24630): FATAL EXCEPTION: main
11-14 01:09:30.566: E/AndroidRuntime(24630): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=2, result=0, data=null} to activity {com.csun.spotr/com.csun.spotr.UploadImageActivity}: java.lang.NullPointerException
11-14 01:09:30.566: E/AndroidRuntime(24630): at android.app.ActivityThread.deliverResults(ActivityThread.java:2532)
11-14 01:09:30.566: E/AndroidRuntime(24630): at android.app.ActivityThread.handleSendResult(ActivityThread.java:2574)
11-14 01:09:30.566: E/AndroidRuntime(24630): at android.app.ActivityThread.access$2000(ActivityThread.java:117)
11-14 01:09:30.566: E/AndroidRuntime(24630): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:961)
11-14 01:09:30.566: E/AndroidRuntime(24630): at android.os.Handler.dispatchMessage(Handler.java:99)
11-14 01:09:30.566: E/AndroidRuntime(24630): at android.os.Looper.loop(Looper.java:130)
11-14 01:09:30.566: E/AndroidRuntime(24630): at android.app.ActivityThread.main(ActivityThread.java:3683)
11-14 01:09:30.566: E/AndroidRuntime(24630): at java.lang.reflect.Method.invokeNative(Native Method)
11-14 01:09:30.566: E/AndroidRuntime(24630): at java.lang.reflect.Method.invoke(Method.java:507)
11-14 01:09:30.566: E/AndroidRuntime(24630): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-14 01:09:30.566: E/AndroidRuntime(24630): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-14 01:09:30.566: E/AndroidRuntime(24630): at dalvik.system.NativeStart.main(Native Method)
11-14 01:09:30.566: E/AndroidRuntime(24630): Caused by: java.lang.NullPointerException
11-14 01:09:30.566: E/AndroidRuntime(24630): at com.csun.spotr.UploadImageActivity.onActivityResult(UploadImageActivity.java:42)
11-14 01:09:30.566: E/AndroidRuntime(24630): at android.app.Activity.dispatchActivityResult(Activity.java:3908)
11-14 01:09:30.566: E/AndroidRuntime(24630): at android.app.ActivityThread.deliverResults(ActivityThread.java:2528)
11-14 01:09:30.566: E/AndroidRuntime(24630): ... 11 more
Just realized that if I take this line out:
super.onActivityResult(requestCode, resultCode, data);
then it no longer crash, but clicking on the image from Gallery didn't pop up on the image view. Any idea?
private static final int SELECT_PICTURE = 1;
private String selectedImagePath, filemanagerstring;
private static File myFile = null;
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,
"Select Picture"), SELECT_PICTURE);
onActivity result::
if (data != null) {
Uri selectedImageUri = data.getData();
filemanagerstring = selectedImageUri.getPath();
selectedImagePath = getPath(selectedImageUri);
if (selectedImagePath != null)
myFile = new File(selectedImagePath);
else if (filemanagerstring != null)
myFile = new File(filemanagerstring);
if (myFile != null) {
Bitmap bmp_fromGallery = decodeImageFile(selectedImagePath);
System.out.println("Bitmap is :: " + myPhoto_bitmap);
//SET BITMAP TO IMAGEVIEW
} else {
Toast.makeText(getApplicationContext(),
myFile.getName() + "is null", Toast.LENGTH_LONG)
.show();
}
} else {
Toast.makeText(SelectPhoto.this, "Please Select Image!!!",
Toast.LENGTH_LONG).show();
}
You cannot send anything with a value of null in eclipse. You will always get a nullPointerException.
Caused by:
java.lang.NullPointerException
at com.csun.spotr.UploadImageActivity.onActivityResult(UploadImageActivity.java:42)
The first at line under cause is the line number of code that is throwing the err
CircleImageView profile;
Bitmap bmp;
SharedPreferences sp;
public static final int PERMISSION_REQUEST_CAMERA = 1;
private static final int PICK_FROM_GALLERY = 1;
onCreate() method :
sp=getSharedPreferences("profilePicture",MODE_PRIVATE);
profile=(CircleImageView)findViewById(R.id.profile);
if(!sp.getString("dp","").equals("")){
byte[] decodedString = Base64.decode(sp.getString("dp", ""), Base64.DEFAULT);
Bitmap decodedByte = BitmapFactory.decodeByteArray(decodedString, 0, decodedString.length);
profile.setImageBitmap(decodedByte);
}
profile.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
openGallery();
}
});
openGallery()
private void openGallery() {
if (ActivityCompat.checkSelfPermission(ProfileActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(ProfileActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}, PICK_FROM_GALLERY);
}
else {
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, 1);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults)
{
switch (requestCode) {
case PICK_FROM_GALLERY:
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Intent galleryIntent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(galleryIntent, PICK_FROM_GALLERY);
} else {
Toast.makeText(ProfileActivity.this,"Not working",Toast.LENGTH_LONG).show();
//do something like displaying a message that he didn`t allow the app to access gallery and you wont be able to let him select from gallery
}
break;
}
}
onActivityResult
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
try {
// When an Image is picked
if (requestCode == PICK_FROM_GALLERY && resultCode == RESULT_OK
&& null != data) {
// Get the Image from data
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
// Get the cursor
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
// Move to first row
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String imgDecodableString = cursor.getString(columnIndex);
cursor.close();
// Set the Image in ImageView after decoding the String
bmp = BitmapFactory
.decodeFile(imgDecodableString);
profile.setImageBitmap(bmp);
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
byte[] byteArray = stream.toByteArray();
String encodedImage = Base64.encodeToString(byteArray, Base64.DEFAULT);
sp.edit().putString("dp", encodedImage).commit();
} else {
Toast.makeText(this, "You haven't picked Image",
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(ProfileActivity.this, "Something went wrong", Toast.LENGTH_LONG).show();
}
}else {
Toast.makeText(ProfileActivity.this, "You haven't picked Image",Toast.LENGTH_LONG).show();
}
}
Method for Choosing an image
private void showImageChooser(){
Intent intent= new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,"Select Your Profile Picture"),CHOOSE_IMAGE)
}
"Uri = uriprofileImage" (Create this Variable globally inside the AppCompactAcivity)
OnActivityResult Method
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == CHOOSE_IMAGE && resultCode == RESULT_OK && data!=null && data.getData() != null) {
uriprofileImage = data.getData();
try {
//getting the image
Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(),uriprofileImage);
//displaying the image
imageView.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
来源：https://stackoverflow.com/questions/8119174/cant-upload-image-from-gallery