4

请多多包涵……我一直在寻找DAYS段代码，它可以启动相机活动、拍照并将其放置在一个简单的 ImageView 上 >。< 下面发布的代码会触发启动活动并拍摄照片，但图像未显示在 ImageView 上！只是缺少什么？:'(

public class MainActivity extends Activity
{
private static final int PICK_IMAGE = 0;

private static final int PICK_IMAGE_FROM_GALLERY = 1;

private Button mBtnCamera, mBtnGallery, mBtnCancel;

private ImageView mImageView;

private Uri mURI;
private String mPhotoPath;

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

    mImageView = (ImageView) findViewById(R.id.imgDisplayImage);

    mBtnCamera = (Button) findViewById(R.id.btnPhotoCamera);
    mBtnGallery = (Button) findViewById(R.id.btnPhotoGallery);
    mBtnCancel = (Button) findViewById(R.id.btnCancel);

    mBtnCamera.setOnClickListener(new OnClickListener()
    {

        @Override
        public void onClick(View v)
        {
            Intent camera = new Intent();

            camera.setAction(MediaStore.ACTION_IMAGE_CAPTURE);

            camera.putExtra("crop", "true");

            File f = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);

            mURI = Uri.fromFile(new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "myFile.jpg"));

            camera.putExtra(MediaStore.EXTRA_OUTPUT, mURI);

            startActivityForResult(camera, PICK_IMAGE);
        }
    });
}   

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    if (requestCode == PICK_IMAGE)
    {
        // Result includes a Bitmap thumbnail?
        if (data != null)
        {
            if (data.hasExtra("data"))
            {
                //Bitmap thumbnail = data.getParcelableExtra("data");

                Bitmap thumbnail = (Bitmap) data.getExtras().get("data");

                mImageView.setImageBitmap(thumbnail);
            }
        }
        // If there is no thumbnail data, the image will have been stored in target output URI.
        else
        {

            Cursor cursor = getContentResolver().query(
                    Media.EXTERNAL_CONTENT_URI, new String[]
                            {
                                Media.DATA, 
                                Media.DATE_ADDED, 
                                MediaStore.Images.ImageColumns.ORIENTATION
                            }, 
                            Media.DATE_ADDED, 
                            null, 
                            "date_added ASC"
            );

            if (cursor != null && cursor.moveToFirst())
            {
                do
                {
                    mURI = Uri.parse(cursor.getString(cursor.getColumnIndex(Media.DATA)));
                    mPhotoPath = mURI.toString();
                }
                while (cursor.moveToNext());
                cursor.close();
            }

            // Resize full image to fit out in image view.
            int width = mImageView.getWidth();
            int height = mImageView.getHeight();

            BitmapFactory.Options factoryOptions = new BitmapFactory.Options();

            factoryOptions.inJustDecodeBounds = true;

            BitmapFactory.decodeFile(/*mURI.getPath()*/ mPhotoPath, factoryOptions);

            int imageWidth = factoryOptions.outWidth;
            int imageHeight = factoryOptions.outHeight;

            // Determine how much to scale down the image
            int scaleFactor = Math.min(
                    imageWidth/width,
                    imageHeight/height
                    );

            // Decode the image file into a Bitmap sized to fill view

            factoryOptions.inJustDecodeBounds = false;
            factoryOptions.inSampleSize = scaleFactor;
            factoryOptions.inPurgeable = true;

            Bitmap bitmap = BitmapFactory.decodeFile(/*mURI.getPath()*/ mPhotoPath, factoryOptions);

            mImageView.setImageBitmap(bitmap);
        }
    }
}
}
4

3 回答 3

1

我在三星 android 的某些设备中遇到了同样的问题然后我实现了逻辑来获取捕获的照片的路径。

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    if (requestCode == PICK_IMAGE)
    {
        Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
        startActivityForResult(cameraIntent, CAMERA_REQUEST_CODE);

        Cursor cursor = getContentResolver().query(Media.EXTERNAL_CONTENT_URI, new String[]{Media.DATA, Media.DATE_ADDED, MediaStore.Images.ImageColumns.ORIENTATION}, Media.DATE_ADDED, null, "date_added ASC");
        if(cursor != null && cursor.moveToFirst())
        {
            do {
                uri = Uri.parse(cursor.getString(cursor.getColumnIndex(Media.DATA)));
                photoPath = uri.toString();
            }while(cursor.moveToNext());
            cursor.close();
        }

        if(photoPath != null) {
            Bitmap bitmap = BitmapFactory.decodeFile(photoPath);
            ///Do Implement your logic whatever you want.
            mImageView.setImageBitmap(bitmap);
        }
    }
}
于 2013-02-28T15:39:05.580 回答
1

尝试和测试在 Galaxy S3 手机上工作。感谢 TGMCians 的帮助。

public class MainActivity extends Activity
{
private static final int PICK_IMAGE = 0;

private static final int PICK_IMAGE_FROM_GALLERY = 1;

private Button mBtnCamera, mBtnGallery, mBtnCancel;

private ImageView mImageView;

private Uri mURI;
private String mPhotoPath;

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

    mImageView = (ImageView) findViewById(R.id.imgDisplayImage);

    mBtnCamera = (Button) findViewById(R.id.btnPhotoCamera);
    mBtnGallery = (Button) findViewById(R.id.btnPhotoGallery);
    mBtnCancel = (Button) findViewById(R.id.btnCancel);

    mBtnCamera.setOnClickListener(new OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            Intent camera = new Intent();

            camera.setAction(MediaStore.ACTION_IMAGE_CAPTURE);

            camera.putExtra("crop", "true");

            File f = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);

            mURI = Uri.fromFile(new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "myFile.jpg"));

            camera.putExtra(MediaStore.EXTRA_OUTPUT, mURI);

            startActivityForResult(camera, PICK_IMAGE);
        }
    });
}   

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
    if (resultCode == Activity.RESULT_OK)
    {
        if (requestCode == PICK_IMAGE)
        {
            Cursor cursor = getContentResolver().query(
                    Media.EXTERNAL_CONTENT_URI, new String[]
                            {
                                Media.DATA, 
                                Media.DATE_ADDED, 
                                MediaStore.Images.ImageColumns.ORIENTATION
                            }, 
                            Media.DATE_ADDED, 
                            null, 
                            "date_added ASC"
            );

            if (cursor != null && cursor.moveToFirst())
            {
                do
                {
                    mURI = Uri.parse(cursor.getString(cursor.getColumnIndex(Media.DATA)));
                    mPhotoPath = mURI.toString();
                }
                while (cursor.moveToNext());
                cursor.close();
            }
            if (data != null)
            {
                if (data.hasExtra("data"))
                {
                    Bitmap thumbnail = (Bitmap) data.getExtras().get("data");

                    mImageView.setImageBitmap(thumbnail);
                }
                else
                {
                    System.out.println("Intent bundle does not have the 'data' Extra");

                    int width = mImageView.getWidth();
                    int height = mImageView.getHeight();

                    BitmapFactory.Options factoryOptions = new BitmapFactory.Options();

                    factoryOptions.inJustDecodeBounds = true;

                    BitmapFactory.decodeFile(/*mURI.getPath()*/ mPhotoPath, factoryOptions);

                    int imageWidth = factoryOptions.outWidth;
                    int imageHeight = factoryOptions.outHeight;

                    // Determine how much to scale down the image
                    int scaleFactor = Math.min(
                            imageWidth/width,
                            imageHeight/height
                            );

                    // Decode the image file into a Bitmap sized to fill view

                    factoryOptions.inJustDecodeBounds = false;
                    factoryOptions.inSampleSize = scaleFactor;
                    factoryOptions.inPurgeable = true;

                    Bitmap bitmap = BitmapFactory.decodeFile(/*mURI.getPath()*/ mPhotoPath, factoryOptions);

                    mImageView.setImageBitmap(bitmap);

                }
            }
        }
    }
    else 
    {
        System.out.println("Picture taking activity NOT returning RESULT_OK");
    }
}
}
于 2013-02-28T16:43:00.137 回答
0

尝试添加

sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));

（和轻微的延迟）就在里面

 if (requestCode == PICK_IMAGE)

堵塞。我认为问题可能是您的设备没有正确刷新媒体存储。

（当然更好的做法是使用 MediaScanner扫描您的文件）

于 2013-02-28T16:32:57.907 回答