您可以使用自定义相机与缩略图图像。 你可以看看我的项目。

以下是完整的代码:

package com.example.cameraa;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {




        Button btnTackPic;
        Uri photoPath;
        ImageView ivThumbnailPhoto;

        static int TAKE_PICTURE = 1;

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

            // Get reference to views

            btnTackPic = (Button) findViewById(R.id.bt1);
            ivThumbnailPhoto = (ImageView) findViewById(R.id.imageView1);




     btnTackPic.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub


                Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE); 
                startActivityForResult(cameraIntent, TAKE_PICTURE); 
            }




    });

        } 

        @Override
        protected void onActivityResult(int requestCode, int resultCode, Intent intent) {


                if (requestCode == TAKE_PICTURE && resultCode == RESULT_OK) {  
                    Bitmap photo = (Bitmap)intent.getExtras().get("data"); 
                   ivThumbnailPhoto.setImageBitmap(photo);
                ivThumbnailPhoto.setVisibility(View.VISIBLE);



            }
        }
}

记住也要为相机添加权限。

你得好好研究一下相机。(我认为要做到你想要的，你必须保存当前的图像到你的应用程序，在那里做选择/删除，然后召回相机再试一次，而不是直接在相机内部重试。)

您可以使用自定义相机与缩略图图像。 你可以看看我的项目。

请使用Kotlin和Andoirdx支持来实现这个例子:

button1.setOnClickListener{
        file = getPhotoFile()
        val uri: Uri = FileProvider.getUriForFile(applicationContext, "com.example.foto_2.filrprovider", file!!)
        captureImage.putExtra(MediaStore.EXTRA_OUTPUT, uri)

        val camaraActivities: List<ResolveInfo> = applicationContext.getPackageManager().queryIntentActivities(captureImage, PackageManager.MATCH_DEFAULT_ONLY)

        for (activity in camaraActivities) {
            applicationContext.grantUriPermission(activity.activityInfo.packageName, uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
        }

        startActivityForResult(captureImage, REQUEST_PHOTO)
    }

活动结果:

if (requestCode == REQUEST_PHOTO) {
        val uri = FileProvider.getUriForFile(applicationContext, "com.example.foto_2.filrprovider", file!!)
        applicationContext.revokeUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
        imageView1.viewTreeObserver.addOnGlobalLayoutListener {
            width = imageView1.width
            height = imageView1.height
            imageView1.setImageBitmap(getScaleBitmap(file!!.path , width , height))
        }
        if(width!=0&&height!=0){
            imageView1.setImageBitmap(getScaleBitmap(file!!.path , width , height))
        }else{
            val size = Point()
            this.windowManager.defaultDisplay.getSize(size)
            imageView1.setImageBitmap(getScaleBitmap(file!!.path , size.x , size.y))
        }

    }

您可以在https://github.com/joelmmx/take_photo_kotlin.git上获得更多详细信息

我希望它能帮助你!

在活动:

@Override
    protected void onCreate(Bundle savedInstanceState) {
                 image = (ImageView) findViewById(R.id.imageButton);
        image.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                try {
                SimpleDateFormat sdfPic = new SimpleDateFormat(DATE_FORMAT);
                currentDateandTime = sdfPic.format(new Date()).replace(" ", "");
                File imagesFolder = new File(IMAGE_PATH, currentDateandTime);
                imagesFolder.mkdirs();
                Random generator = new Random();
                int n = 10000;
                n = generator.nextInt(n);
                String fname = IMAGE_NAME + n + IMAGE_FORMAT;
                File file = new File(imagesFolder, fname);
                outputFileUri = Uri.fromFile(file);
                cameraIntent= new Intent(
                        android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
                                startActivityForResult(cameraIntent, CAMERA_DATA);
                }catch(Exception e) {
                    e.printStackTrace();
                }

            }
        });
           @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch(requestCode) {
        case CAMERA_DATA :
                final int IMAGE_MAX_SIZE = 300;
                try {
                    // Bitmap bitmap;
                    File file = null;
                    FileInputStream fis;
                    BitmapFactory.Options opts;
                    int resizeScale;
                    Bitmap bmp;
                    file = new File(outputFileUri.getPath());
                    // This bit determines only the width/height of the
                    // bitmap
                    // without loading the contents
                    opts = new BitmapFactory.Options();
                    opts.inJustDecodeBounds = true;
                    fis = new FileInputStream(file);
                    BitmapFactory.decodeStream(fis, null, opts);
                    fis.close();

                    // Find the correct scale value. It should be a power of
                    // 2
                    resizeScale = 1;

                    if (opts.outHeight > IMAGE_MAX_SIZE
                            || opts.outWidth > IMAGE_MAX_SIZE) {
                        resizeScale = (int) Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE/ (double) Math.max(opts.outHeight, opts.outWidth)) / Math.log(0.5)));
                    }

                    // Load pre-scaled bitmap
                    opts = new BitmapFactory.Options();
                    opts.inSampleSize = resizeScale;
                    fis = new FileInputStream(file);
                    bmp = BitmapFactory.decodeStream(fis, null, opts);
                    Bitmap getBitmapSize = BitmapFactory.decodeResource(
                            getResources(), R.drawable.male);
                    image.setLayoutParams(new RelativeLayout.LayoutParams(
                            200,200));//(width,height);
                    image.setImageBitmap(bmp);
                    image.setRotation(90);
                    fis.close();

                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
                    bmp.compress(Bitmap.CompressFormat.JPEG, 70, baos);
                    imageByte = baos.toByteArray();
                    break;
                } catch (FileNotFoundException e) {

                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

在layout.xml:

enter code here
<RelativeLayout
        android:id="@+id/relativeLayout2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">


        <ImageView
            android:id="@+id/imageButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

                            android:src="@drawable/XXXXXXX"
            android:textAppearance="?android:attr/textAppearanceSmall" />

在manifest.xml:

< uses-permission android: name = " android.permission。CAMERA" /> <uses-feature android:name="android.硬件。相机" / >