Question

问题类：

    public class problem extends Activity {

        ImageView iv;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.problem);

    iv=(ImageView) findViewById(R.id.imageView1);

    Button b=(Button) findViewById(R.id.button1);
    b.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
        Intent intent=new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(intent, 0);

        }
    });
            }

         @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);
        Bitmap bm=(Bitmap) data.getExtras().get("data");
       iv.setImageBitmap(bm);
           }    
           }

这就是我想要做的事情：

拍摄多张照片
在屏幕上显示
将它们存储在mysql数据库中。

我是android新手，请告诉我该怎么做。我搜索过。但我找不到答案。从这段代码中只拍摄一张照片。

Answer 1

保存前在屏幕上显示图像：

使用我的代码。我正在使用相机意图拍照并在将其保存到图库之前，使用“保存并取消”按钮向用户显示： - 调用相机意图： -

// This code is to call the camera intent. Basically it will start your camera. Put this code in a button or something                        
String SD_CARD_TEMP_DIR = Environment.getExternalStorageDirectory() + File.separator +CommonFunction.getDateTime()+".jpg"; // Get File Path
                        Intent takePictureFromCameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                        takePictureFromCameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(SD_CARD_TEMP_DIR)));
                        startActivityForResult(takePictureFromCameraIntent, 123);

onActivityResult： -

// This function is called when you come back to your activity after the intent has finished. Do read android documentation on Google. It will Help
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == CAMERA_RESULT) 
    {
        if (resultCode == Activity.RESULT_OK) 
        {
            String galleryImatePath = SD_CARD_TEMP_DIR; // make SD_CARD_TEMP_DIR Global so that you can access it here from camera intent or pass it in put Extra method and retrieve it here
            File f = new File(galleryImatePath);

            try {//This code will rotate your image if you have taken the image by rotating the camera
                        Bitmap cameraBitmap = null;
                        BitmapFactory.Options bmOptions = new BitmapFactory.Options();
                        bmOptions.inJustDecodeBounds = false;
                        bmOptions.inPurgeable = true;
                        bmOptions.inBitmap = cameraBitmap; 
                        bmOptions.inMutable = true; 


                        cameraBitmap = BitmapFactory.decodeFile(galleryImatePath,bmOptions);
                        ByteArrayOutputStream bos = new ByteArrayOutputStream();
                        cameraBitmap.compress(Bitmap.CompressFormat.JPEG, 50, bos);

                        //To Rotate image Code
                            ExifInterface exif = new ExifInterface(galleryImatePath);
                            float rotation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);  
                            System.out.println(rotation);

                        float rotationInDegrees = exifToDegrees(rotation);
                        System.out.println(rotationInDegrees);

                        Matrix matrix = new Matrix();
                        matrix.postRotate(rotationInDegrees);

                        final Bitmap rotatedBitmap = Bitmap.createBitmap(cameraBitmap , 0, 0, cameraBitmap.getWidth(), cameraBitmap.getHeight(), matrix, true);
                        FileOutputStream fos=new FileOutputStream(galleryImatePath);
                        rotatedBitmap.compress(Bitmap.CompressFormat.JPEG, 50, fos);
                        fos.write(bos.toByteArray());
                        cameraBitmap.recycle();
                        System.gc();
                        fos.flush();
                        fos.close();


                        // To set image in imageview in dialog. This code will set your image in a custon dialog box "captiondialog". It will contain a full width and height imageview and two textviews - done and cancel. It is upto u what you want to define in the textview's click listener. For example, you can pass the storing image in database in the "Done" textview and "Cancel" textview will dismiss your captiondialog and you app will return to your activity
                    Capdialog = new Dialog(AddToDo.this,android.R.style.Theme_NoTitleBar_Fullscreen);
                    Capdialog.setContentView(R.layout.captiondialog);
                    Capdialog.setCancelable(false);
                    TextView cancel = (TextView) Capdialog
                            .findViewById(R.id.cancel);
                    TextView done = (TextView) Capdialog.findViewById(R.id.done);
                                                Capdialog.getWindow().setSoftInputMode (WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
                    ImageView img = (ImageView) Capdialog.findViewById(R.id.image);
                    img.setImageBitmap(rotatedBitmap);
               }
               catch(Exception e){}
      }
 }
}

实现您的完成并取消点击监听器 - 您要在其中执行的操作。我的代码将捕获您的图像，无论相机旋转如何都向右旋转，并在保存之前在对话框中显示它

此代码会将您的图像存储在DB中。您必须使用“blob”存储图像。使用此代码： - public void insertImageInDb（int id，Bitmap img）{

byte[] data = bos.toByteArray(); // Use This or the code in comments below

/*  ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    bitmap.compress(CompressFormat.PNG, 0, outputStream);       
    byte[] data = outputStream.toByteArray();*/

insertStatement_logo.bindLong(1, id);       
insertStatement_logo.bindBlob(2, data);

insertStatement_logo.executeInsert();
insertStatement_logo.clearBindings() ;

}

对于以静止图像模式启动相机的设备相机还有另一种意图操作，并且在用户完成活动之前不会退出：

Intent intent = new Intent(
    MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA);
this.startActivity(intent);

与ContentObserver一起使用，这正是我需要完成的任务。或者在ActivityResult中处理它。

注意： - 如果你是Android的新手，这对你来说太难理解了。请先在谷歌上阅读android文档并阅读教程。制作基本应用。先学习

Android相机拍多张照片

1 个答案: