Android는 갤러리에서 ImageView로 이미지 가져 오기

Android는 갤러리에서 ImageView로 이미지 가져 오기

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갤러리의 사진을 a에 추가하려고하는데이 ImageView오류가 발생합니다.

java.lang.RuntimeException : 결과 ResultInfo {who = null, request = 1, result = -1, data = Intent {dat = content : // media / external / images / media / 1}}를 활동 {hotMetter. pack / hotMetter.pack.GetPhoto} : java.lang.NullPointerException

이것은 내 코드입니다.

      Intent intent = new Intent();
      intent.setType("image/*");
      intent.setAction(Intent.ACTION_GET_CONTENT);

      startActivityForResult(Intent.createChooser(intent,"Select Picture"), SELECT_PICTURE);
}
Bitmap bitmap=null;
public void onActivityResult(int requestCode, int resultCode, Intent data)
{

    if (resultCode == Activity.RESULT_OK)
    {
        if (requestCode == SELECT_PICTURE) 
        {
             Uri selectedImageUri = data.getData();           
             selectedImagePath = getPath(selectedImageUri);             
             tv.setText(selectedImagePath);
             img.setImageURI(selectedImageUri); 
         }
    }


 public String getPath(Uri uri) 
    {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        if (cursor == null) return null;
        int column_index =             cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        String s=cursor.getString(column_index);
        cursor.close();
        return s;
    }

나는 selectedImagePath="mnt/sdcard/DCIM/myimage"있지만 img.setImageURI(selectedImageUri);오류가 발생합니다.

나는 또한 a Bitmap를 사용하고 이미지를 설정하려고했지만 SetImageBitmap동일한 오류가 발생합니다.

LogCat :

05-06 19:41:34.191: E/AndroidRuntime(8466): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { dat=content://media/external/images/media/1 }} to activity {hotMetter.pack/hotMetter.pack.GetPhoto}: java.lang.NullPointerException
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2532)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.handleSendResult(ActivityThread.java:2574)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.access$2000(ActivityThread.java:117)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:961)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.os.Looper.loop(Looper.java:123)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.main(ActivityThread.java:3683)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at java.lang.reflect.Method.invokeNative(Native Method)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at java.lang.reflect.Method.invoke(Method.java:507)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at dalvik.system.NativeStart.main(Native Method)
05-06 19:41:34.191: E/AndroidRuntime(8466): Caused by: java.lang.NullPointerException
05-06 19:41:34.191: E/AndroidRuntime(8466):     at hotMetter.pack.GetPhoto.onActivityResult(GetPhoto.java:55)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.Activity.dispatchActivityResult(Activity.java:3908)
05-06 19:41:34.191: E/AndroidRuntime(8466):     at android.app.ActivityThread.deliverResults(ActivityThread.java:2528)

조언 부탁드립니다. 감사합니다!

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디버그 모드에서 앱을 실행하고 if에 중단 점을 설정하고 (requestCode == SELECT_PICTURE)단계별로 각 변수를 검사하여 예상대로 설정되었는지 확인합니다. NPE를 받으면 img.setImageURI(selectedImageUri);둘 중 하나 img또는 selectedImageUri설정되지 않습니다.

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Intent먼저 간단한 패스 :

Intent i = new Intent(Intent.ACTION_PICK,android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);

그리고 당신은 당신의 그림 경로를 얻을 것입니다 onActivityResult:

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && 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]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();
            ImageView imageView = (ImageView) findViewById(R.id.imgView);
            imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
        }
    }

여기 에 전체 소스 코드

---

다음을 시도하십시오.

import java.io.FileDescriptor;
import java.io.IOException;
import android.app.Activity;
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.os.ParcelFileDescriptor;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class ImageGalleryDemoActivity extends Activity {


    private static int RESULT_LOAD_IMAGE = 1;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Button buttonLoadImage = (Button) findViewById(R.id.buttonLoadPicture);
        buttonLoadImage.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {

                Intent i = new Intent(
                        Intent.ACTION_PICK,
                        android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

                startActivityForResult(i, RESULT_LOAD_IMAGE);
            }
        });
    }


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

        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && 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]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

            ImageView imageView = (ImageView) findViewById(R.id.imgView);

            Bitmap bmp = null;
            try {
                bmp = getBitmapFromUri(selectedImage);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            imageView.setImageBitmap(bmp);

        }


    }



    private Bitmap getBitmapFromUri(Uri uri) throws IOException {
        ParcelFileDescriptor parcelFileDescriptor =
                getContentResolver().openFileDescriptor(uri, "r");
        FileDescriptor fileDescriptor = parcelFileDescriptor.getFileDescriptor();
        Bitmap image = BitmapFactory.decodeFileDescriptor(fileDescriptor);
        parcelFileDescriptor.close();
        return image;
    }


}

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@parag의 코드는 훌륭하게 작동합니다. 그러나 일부 큰 이미지를로드하는 동안 실패 할 수 있습니다. 사용해야합니다.

imageView.setImageBitmap(getScaledBitmap(picturePath, 800, 800));

대신에;

imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));

사용할 수있는 방법은 다음과 같습니다.

private Bitmap getScaledBitmap(String picturePath, int width, int height) {
    BitmapFactory.Options sizeOptions = new BitmapFactory.Options();
    sizeOptions.inJustDecodeBounds = true;
    BitmapFactory.decodeFile(picturePath, sizeOptions);

    int inSampleSize = calculateInSampleSize(sizeOptions, width, height);

    sizeOptions.inJustDecodeBounds = false;
    sizeOptions.inSampleSize = inSampleSize;

    return BitmapFactory.decodeFile(picturePath, sizeOptions);
}

private int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

        // Calculate ratios of height and width to requested height and
        // width
        final int heightRatio = Math.round((float) height / (float) reqHeight);
        final int widthRatio = Math.round((float) width / (float) reqWidth);

        // Choose the smallest ratio as inSampleSize value, this will
        // guarantee
        // a final image with both dimensions larger than or equal to the
        // requested height and width.
        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }

    return inSampleSize;
}

---

이것은 갤러리에서 이미지를 가져오고 자르는 가장 쉬운 방법입니다.

1 단계 : 결과에 대한 StartActivity

imageUser.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Intent intent = new Intent(Intent.ACTION_PICK,
                    MediaStore.Images.Media.INTERNAL_CONTENT_URI);
            intent.setType("image/*");
            intent.putExtra("crop", "true");
            intent.putExtra("scale", true);
            intent.putExtra("outputX", 256);
            intent.putExtra("outputY", 256);
            intent.putExtra("aspectX", 1);
            intent.putExtra("aspectY", 1);
            intent.putExtra("return-data", true);
            startActivityForResult(intent, 1);

            }
    });

2 단계 : 결과 처리

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode != RESULT_OK) {
        return;
    }
    if (requestCode == 1) {
        final Bundle extras = data.getExtras();
        if (extras != null) {
            //Get image
            Bitmap ProfilePic = extras.getParcelable("data");
            imageUser.setImageBitmap(ProfilePic);
            TextView t=(TextView)findViewById(R.id.textoverimage);
            t.setText("image Selected");
        }
    }


}

---

라이브러리 ContentManager를 사용하는 가장 간단한 방법이라고 생각합니다. 장치 갤러리, 클라우드 또는 카메라에서 사진 또는 비디오를 가져 오기위한이 라이브러리입니다. 클라우드의 비동기로드 및 일부 문제 장치의 버그 수정.

Gradle을 통해 다운로드 : https://github.com/stfalcon-studio/ContentManager compile 'com.github.stfalcon:contentmanager:0.4.3' 에서 문서를 찾을 수 있습니다 .

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import android.content.Intent;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

    ImageView img;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        img = (ImageView)findViewById(R.id.imageView);
    }

    public void btn_gallery(View view) {

        Intent intent =new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.INTERNAL_CONTENT_URI);

        startActivityForResult(intent,100);
    }

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

        if (requestCode==100 && resultCode==RESULT_OK)
        {
            Uri uri = data.getData();
            img.setImageURI(uri);
        }
    }
}

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ImageView img가 컴파일러에 대해 null과 동일하게 인스턴스화되지 않았다고 생각합니다. 이것이 NullPointerException이 발생하는 이유입니다.

활동에 전화 했니

img = (ImageView) findViewById(R.id.my_imageview);

my_imageview는 ImageView 위젯의 ID입니다 !!

---

@Parag Chauhan soltution이 잘 작동하지만 문제가있었습니다. 일부 파일 관리자 앱이 "content : // ..."대신 Intent 개체 "file : /// ..."로 반환됩니다. 쿼리를 사용하는 데 필요합니다. .

그 문제에 대한 내 짧은 해결책이 있습니다.

public String getRealPathFromURI(Context context, Uri contentUri) {
    Cursor cursor = null;
    try {

        if("content".equals(contentUri.getScheme())) {
            String[] proj = {MediaStore.Images.Media.DATA};
            cursor = context.getContentResolver().query(contentUri, proj, null, null, null);
            int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            cursor.moveToFirst();
            return cursor.getString(column_index);
        }
        else{
            return contentUri.getPath();
        }


    } finally {
        if (cursor != null) {
            cursor.close();
        }
    }
}    

@Parag 솔루션을 기반으로,

부분 솔루션 (@nobre) Android : 콘텐츠 URI에서 파일 URI 가져 오기?

여기에 parital 솔루션 (@Nikolay) 미디어 저장소의 URI에서 파일 이름 및 경로 가져 오기

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원래 대답은 경로가 Uri.parse ( "file : //"+ file.getPath);와 같은 접두사를 결합해야한다는 것입니다.

---

다음은 나를 위해 일한 코드입니다.

Button buttonLoadImage = (Button) findViewById(R.id.button4);
    buttonLoadImage.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(Intent.ACTION_PICK,
                    MediaStore.Images.Media.INTERNAL_CONTENT_URI);
            intent.setType("image/*");
            intent.putExtra("crop", "true");
            intent.putExtra("scale", true);
            intent.putExtra("outputX", 256);
            intent.putExtra("outputY", 256);
            intent.putExtra("aspectX", 1);
            intent.putExtra("aspectY", 1);
            intent.putExtra("return-data", true);
            startActivityForResult(intent, 1);}});
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode != RESULT_OK) {

        if (requestCode == RESULT_LOAD_IMAGE && data != null) {
            Uri imageUri = data.getData();
            imageView = (ImageView) findViewById(R.id.imgView);
            imageView.setImageURI(imageUri);}}}

매니페스트 파일 추가

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

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put below code in button click event

Intent ImageIntent = new Intent(Intent.ACTION_PICK,               
MediaStore.Images.Media.EXTERNAL_CONTENT_URI); //implicit intent
UploadImage.this.startActivityForResult(ImageIntent,99);

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put below code in startActivityforResult event

Uri ImagePathAndName = data.getData();
imgpicture.setImageURI(ImagePathAndName);

---

parag-chauhan and devrim answers are perfect, but i change the onActivityResult without cursor, and it makes the code much more better.

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

    if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && data != null) {
        Uri selectedImage = data.getData();
        try {
           ImageView imageView = (ImageView) findViewById(R.id.imgView);
           imageView.setImageBitmap(getScaledBitmap(selectedImage,800,800));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

private Bitmap getScaledBitmap(Uri selectedImage, int width, int height) throws FileNotFoundException {
    BitmapFactory.Options sizeOptions = new BitmapFactory.Options();
    sizeOptions.inJustDecodeBounds = true;
    BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, sizeOptions);

    int inSampleSize = calculateInSampleSize(sizeOptions, width, height);

    sizeOptions.inJustDecodeBounds = false;
    sizeOptions.inSampleSize = inSampleSize;

    return BitmapFactory.decodeStream(getContentResolver().openInputStream(selectedImage), null, sizeOptions);
}

private int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {
        // Calculate ratios of height and width to requested one
        final int heightRatio = Math.round((float) height / (float) reqHeight);
        final int widthRatio = Math.round((float) width / (float) reqWidth);

        // Choose the smallest ratio as inSampleSize value
        inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
    }
    return inSampleSize;
}

ReferenceURL : https://stackoverflow.com/questions/10473823/android-get-image-from-gallery-into-imageview