Question

我使用的是Android-Crop https://github.com/jdamcd/android-crop，以便使用相机onActivityResult捕获图像来平方裁剪结果。问题在于，由于某些原因，这个库接缝无法预测地旋转图像。

以下是创建我正在处理onActivityResult - CropImageActivity的输出的库的Activity。

剪裁的结果只是在ImageView中加载Picasso。图像文件临时存储在 Environment.getExternalStoragePublicDirectory（Environment.DIRECTORY_DCIM）中，此文件以EXTRA_OUTPUT的形式提供，用于捕获图像，然后进行裁剪，然后加载到ImageVIew中。

问题在于，对于某些Android手机而言，图像是正确旋转的，但对于其他Android手机则不然。 Nexus 5还可以，Xperia Z不是等等......

我正在寻找一种简单的方法来确保图像正确旋转。在此先感谢您的帮助！

Answer 1

我使用过This cropping library并且它工作正常。以下是将要解决的步骤。

在build.gradle（app）文件中添加“compile'com.isseiaoki：simplecropview：1.1.7'”
在主类文件中创建一个全局变量，您可以从中调用相机意图 private static final int REQUEST_CODE_FOR_IMAGE_CROPPING = 65;

public static final int REQUEST_CODE_FOR_OPENCAMERA = 300;

打开相机的onButton点击列表编写代码

// create file 
File newfile = createFile();
Uri outputFileUri = Uri.fromFile(newfile);
String uriString = outputFileUri.toString();

Intent intent = new Intent();
intent.setAction(MediaStore.ACTION_IMAGE_CAPTURE); 
intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);
context.startActivityForResult(intent, OPENCAMERA);

在onCreate（）之后写下创建文件的方法。

 private File createFile() {
String root = Environment.getExternalStorageDirectory().toString();
myDir = new File(root + File.separator + "YourFolderName");
if (!myDir.exists())
    myDir.mkdirs();

File newfile = new File(myDir, "IMG_" + System.currentTimeMillis() + ".JPG");
try {
    newfile.createNewFile();
} catch (IOException e) {
}
return newfile;
}

获取有关相机意图的onActivityResult的数据，如下所示。

if (requestCode == REQUEST_CODE_FOR_OPENCAMERA) {
if (resultCode == RESULT_OK) {
        try {
            uriStr = (Uri) data.getExtras().get("data");

            Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), uriStr);

            if (bitmap != null) {

                Intent gotoCropImage = new Intent(thisActivity, CropMyImageActivity.class);
                gotoCropImage.setData(uriStr);
                startActivityForResult(gotoCropImage, REQUEST_CODE_FOR_IMAGE_CROPPING);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    } else if (resultCode == RESULT_CANCELED) {
        // user cancelled Image capture
        DialogManager.showToast(thisActivity, getString(R.string.user_cancelled_image_capture));
    }
}

使用名称CropMyImageActivity.java创建新活动，并在下面编写代码

  import android.content.Intent;
  import android.graphics.Bitmap;
  import android.net.Uri;
  import android.os.Bundle;
  import android.view.View;
  import android.widget.ImageButton;

  import com.isseiaoki.simplecropview.CropImageView;
  import com.isseiaoki.simplecropview.callback.CropCallback;
  import com.isseiaoki.simplecropview.callback.LoadCallback;
  import com.isseiaoki.simplecropview.callback.SaveCallback;
  import com.pioneer.parivaar.activities.BaseActivity;

  public class CropMyImageActivity extends BaseActivity implements View.OnClickListener {

private Uri mSourceUri = null;
private CropImageView mCropView;
private Bitmap.CompressFormat mCompressFormat = Bitmap.CompressFormat.JPEG;
private ImageButton rotateLeft, rotateRight, doneBtn, cancelBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_crop_my_image);

    mCropView = (CropImageView) findViewById(R.id.cropImageView);
    rotateLeft = (ImageButton) findViewById(R.id.buttonRotateLeft);
    rotateRight = (ImageButton) findViewById(R.id.buttonRotateRight);
    doneBtn = (ImageButton) findViewById(R.id.buttonDone);
    cancelBtn = (ImageButton) findViewById(R.id.buttonCancel);

    mSourceUri = getIntent().getData();

    rotateLeft.setOnClickListener(this);
    rotateRight.setOnClickListener(this);
    doneBtn.setOnClickListener(this);
    cancelBtn.setOnClickListener(this);
    // load image
    mCropView.setCropMode(CropImageView.CropMode.SQUARE);
    mCropView.load(mSourceUri)
            .useThumbnail(true)
            .execute(mLoadCallback);


}

private final LoadCallback mLoadCallback = new LoadCallback() {
    @Override public void onSuccess() {
    }

    @Override public void onError(Throwable e) {
    }
};

private final CropCallback mCropCallback = new CropCallback() {
    @Override public void onSuccess(Bitmap cropped) {
        mCropView.save(cropped)
                .compressFormat(mCompressFormat)
                .execute(mSourceUri, mSaveCallback);
    }

    @Override public void onError(Throwable e) {
    }
};
private final SaveCallback mSaveCallback = new SaveCallback() {
    @Override public void onSuccess(Uri outputUri) {
        Intent i = new Intent();
        i.setData(outputUri);
        setResult(RESULT_OK, i);
        finish();
    }

    @Override public void onError(Throwable e) {
    }
};


@Override
public void onClick(View view) {
    switch (view.getId()){
        case R.id.buttonRotateLeft:
            mCropView.rotateImage(CropImageView.RotateDegrees.ROTATE_M90D);
            break;
        case R.id.buttonRotateRight:
            mCropView.rotateImage(CropImageView.RotateDegrees.ROTATE_90D);
            break;
        case R.id.buttonDone:
            mCropView.crop(mSourceUri).execute(mCropCallback);
            break;

        case R.id.buttonCancel:
            setResult(RESULT_CANCELED);
            finish();
            break;
    }
}
}

创建一个名为activity_crop_my_image.xml的xml文件，如下所示

  <?xml version="1.0" encoding="utf-8"?>
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:custom="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">


<com.isseiaoki.simplecropview.CropImageView
    android:id="@+id/cropImageView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:padding="@dimen/margin25"
    custom:scv_background_color="@color/windowBackground"
    custom:scv_crop_mode="fit_image"
    custom:scv_frame_color="@color/colorAccent"
    custom:scv_frame_stroke_weight="1dp"
    custom:scv_guide_color="@color/colorAccent"
    custom:scv_guide_show_mode="show_always"
    custom:scv_guide_stroke_weight="1dp"
    custom:scv_handle_color="@color/colorAccent"
    custom:scv_handle_show_mode="show_always"
    custom:scv_handle_size="14dp"
    custom:scv_min_frame_size="50dp"
    custom:scv_overlay_color="@color/overlay"
    custom:scv_touch_padding="8dp" />

<View
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:layout_marginLeft="@dimen/margin7"
    android:layout_marginRight="@dimen/margin7"
    android:background="@color/black"
    />


<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@id/cropImageView"
    android:layout_centerHorizontal="true"
    android:orientation="horizontal">

    <ImageButton
        android:id="@+id/buttonCancel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:background="?attr/selectableItemBackgroundBorderless"
        android:padding="16dp"
        android:src="@drawable/crop__ic_cancel" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:orientation="horizontal">

        <ImageButton
            android:id="@+id/buttonRotateLeft"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:padding="@dimen/margin5"
            android:src="@drawable/rotate_left" />

        <ImageButton
            android:id="@+id/buttonRotateRight"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:background="?attr/selectableItemBackgroundBorderless"
            android:padding="@dimen/margin5"
            android:src="@drawable/rotate_right" />

    </LinearLayout>

    <ImageButton
        android:id="@+id/buttonDone"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:background="?attr/selectableItemBackgroundBorderless"
        android:padding="16dp"
        android:src="@drawable/crop__ic_done" />
</RelativeLayout>

REQUEST_CODE_FOR_IMAGE_CROPPING的OnActivity结果写下代码

if (requestCode == REQUEST_CODE_FOR_IMAGE_CROPPING ){
        if (resultCode == RESULT_OK ) {
            mExecutor = Executors.newSingleThreadExecutor();
            Uri myUri = data.getData();
            mExecutor.submit(new LoadScaledImageTask(this, myUri, profileImage, calcImageSize()));
            imageTypedFile = new TypedFile("multipart/form-data", new File(myUri.toString().substring(7)));
        } else if (resultCode == RESULT_CANCELED){
            DialogManager.showToast(BigFarmerActivity.this, getString(R.string.user_cancelled_image_cropping));
        }
    }

Answer 2

经过一番努力，我找到了答案。该库正在从MediaStore中提取exif数据，但我没有在那里存储我的临时文件。我想到了两种可能的解决方案。第一种是在裁剪之前读取exif方向，并在裁剪之后设置方向属性。另一种方法是将文件保存到媒体商店。

CropUtil.copyExifRotation(CropUtil.getFromMediaUri(this, this.getContentResolver(), 
this.sourceUri), CropUtil.getFromMediaUri(this, this.getContentResolver(), this.saveUri));
        this.setResultUri(this.saveUri);

Answer 3

您可以尝试使用此库https://github.com/Yalantis/uCrop 它可以旋转图像。

Android库 - android-crop旋转捕获的图像

3 个答案: