Question

我制作了一个应用程序，您可以使用默认相机拍摄照片，然后将其显示在图像视图上。问题是，图像不会显示在图像视图中。尝试了许多方法，但没有解决方案。

mainactivity.java：

public class MainActivity extends Activity {

    private static final int ACTIVITY_START_CAMERA_APP = 0;
    static final int REQUEST_IMAGE_CAPTURE = 1;
    private ImageView mPhotoCapturedImageView;

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

    public void takePhoto(View view){
        Intent callCameraApplicationIntent = new Intent();
        callCameraApplicationIntent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(callCameraApplicationIntent, ACTIVITY_START_CAMERA_APP);
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        Toast.makeText(this, "Picture taken sucessfully!", Toast.LENGTH_SHORT).show();
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            Bundle extras = data.getExtras();
            Bitmap imageBitmap = (Bitmap) extras.get("data");
            mPhotoCapturedImageView.setImageBitmap(imageBitmap);
        }
    }
}

main_activity.xml：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.taufiq.ocrdemo.MainActivity">

    <ImageView
        android:id="@+id/capturePhotoImageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/photoButton"
        android:layout_marginBottom="19dp"
        android:layout_marginEnd="43dp"
        android:layout_marginLeft="43dp"
        android:layout_marginRight="43dp"
        android:layout_marginStart="43dp"
        android:layout_marginTop="16dp"
        android:contentDescription="@string/preview"
        android:minHeight="300dp"
        app:layout_constraintBottom_toTopOf="@+id/photoButton"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="MissingConstraints"
        tools:layout_constraintBottom_creator="1"
        tools:layout_constraintLeft_creator="1"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintTop_creator="1"
        tools:minHeight="300dp" />

    <Button
        android:id="@+id/photoButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="takePhoto"
        android:text="@string/capture_photo"
        android:layout_weight="1"
        tools:ignore="MissingConstraints"
        tools:layout_constraintRight_creator="1"
        tools:layout_constraintBottom_creator="1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        tools:layout_constraintLeft_creator="1"
        android:layout_marginBottom="27dp"
        app:layout_constraintLeft_toLeftOf="parent" />

</android.support.constraint.ConstraintLayout>

Answer 1

问题出在这里：

if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {

您正在使用requestCode ACTIVITY_START_CAMERA_APP

启动活动

startActivityForResult(callCameraApplicationIntent, ACTIVITY_START_CAMERA_APP);

所以你需要修改if条件，如：

 if (requestCode == ACTIVITY_START_CAMERA_APP && resultCode == RESULT_OK) {

Answer 2

嗯，它不知道，因为您传递的捕获和活动结果的ID不同，startActivityForResult(callCameraApplicationIntent, ACTIVITY_START_CAMERA_APP);来自requestCode == REQUEST_IMAGE_CAPTURE匹配。

Answer 3

在这里调试：也许它不会插入这个：

@RequestMapping(value = "ajaxhai.do", method = RequestMethod.POST,consumes="application/json")**//Please note : here it is String and not Object[]**
    public  String testAjaxPost(@RequestBody String ajaxRes, Model model,
            HttpServletRequest request, HttpServletResponse response) {

        System.out.println(ajaxRes);
        Gson gson = new Gson();
        TestAjaxDto[] mcArray = gson.fromJson(ajaxRes, TestAjaxDto[].class);
        List<TestAjaxDto> mcList = new ArrayList<TestAjaxDto>(Arrays.asList(mcArray));
        System.out.println(mcList);
        return "ajaxform";
    }

顺便说一下某些设备没有给图像内部数据。所以你必须在拍摄前给出路径。这是样本：

首先在课堂内添加：

  if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            Bundle extras = data.getExtras();
            Bitmap imageBitmap = (Bitmap) extras.get("data");
            mPhotoCapturedImageView.setImageBitmap(imageBitmap);
        }

然后在课堂内的某处添加：

你必须存储它，因为相机是新意图

private Uri uriFilePath;

在onCreate上添加：

@Override
    protected void onSaveInstanceState(Bundle outState) {

        if (uriFilePath != null) outState.putString("uri_file_path", uriFilePath.toString());
        super.onSaveInstanceState(outState);
    }

这里是捕获功能：

 if (savedInstanceState != null) {
            if (uriFilePath == null && savedInstanceState.getString("uri_file_path") != null) {
                uriFilePath = Uri.parse(savedInstanceState.getString("uri_file_path"));
            }


        }

然后使用它来获取onActivityResult中的图像：

private void captureImage() {
    PackageManager packageManager = this.getPackageManager();
    if (packageManager.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
        File mainDirectory = new File(Environment.getExternalStorageDirectory(), "Tofaş");//tmp
        if (!mainDirectory.exists())
            mainDirectory.mkdirs();

        Calendar calendar = Calendar.getInstance();
        cameraFileName = "IMG_" + calendar.getTimeInMillis()+".jpg";
        uriFilePath = Uri.fromFile(new File(mainDirectory, cameraFileName));
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, uriFilePath);
        startActivityForResult(intent, RC_CAMERA);

    }

}

ImageView未在活动中显示图像

3 个答案: