我正在使用https://github.com/jdamcd/android-crop中的裁剪图像库来获取图库和相机中的图像。如果我从相机获取图像后没有改变方向，它在相机上工作正常。但是当我在裁剪之前单击图像后更改方向时，应用程序崩溃。很少有博客告诉我使用android:configChanges="orientation|keyboardHidden|screenSize"，但却没有成功。即使我已经将Manifest文件的方向锁定在我称之为裁剪方法的活动上。我的代码和错误堆栈如下：
package eu.janmuller.android.simplecropimage.example;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import eu.janmuller.android.simplecropimage.CropImage;
public class MainActivity extends Activity {
public static final String TAG = "MainActivity";
public static final String TEMP_PHOTO_FILE_NAME = "temp_photo.jpg";
private File mFileTemp;
public static final int REQUEST_CODE_GALLERY = 0x1;
public static final int REQUEST_CODE_TAKE_PICTURE = 0x2;
public static final int REQUEST_CODE_CROP_IMAGE = 0x3;
private ImageView mImageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); //To change body of overridden methods use File | Settings | File Templates.
setContentView(R.layout.main);
findViewById(R.id.gallery).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
openGallery();
}
});
findViewById(R.id.take_picture).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
takePicture();
}
});
mImageView = (ImageView) findViewById(R.id.image);
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
mFileTemp = new File(Environment.getExternalStorageDirectory(), TEMP_PHOTO_FILE_NAME);
}
else {
mFileTemp = new File(getFilesDir(), TEMP_PHOTO_FILE_NAME);
}
}
private void takePicture() {
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
try {
Uri mImageCaptureUri = null;
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
mImageCaptureUri = Uri.fromFile(mFileTemp);
}
else {
/*
* The solution is taken from here: http://stackoverflow.com/questions/10042695/how-to-get-camera-result-as-a-uri-in-data-folder
*/
mImageCaptureUri = InternalStorageContentProvider.CONTENT_URI;
}
intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
intent.putExtra("return-data", true);
startActivityForResult(intent, REQUEST_CODE_TAKE_PICTURE);
} catch (ActivityNotFoundException e) {
Log.d(TAG, "cannot take picture", e);
}
}
private void openGallery() {
Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, REQUEST_CODE_GALLERY);
}
private void startCropImage() {
Intent intent = new Intent(this, CropImage.class);
intent.putExtra(CropImage.IMAGE_PATH, mFileTemp.getPath());
intent.putExtra(CropImage.SCALE, true);
intent.putExtra(CropImage.ASPECT_X, 3);
intent.putExtra(CropImage.ASPECT_Y, 3);
startActivityForResult(intent, REQUEST_CODE_CROP_IMAGE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != RESULT_OK) {
return;
}
Bitmap bitmap;
switch (requestCode) {
case REQUEST_CODE_GALLERY:
try {
InputStream inputStream = getContentResolver().openInputStream(data.getData());
FileOutputStream fileOutputStream = new FileOutputStream(mFileTemp);
copyStream(inputStream, fileOutputStream);
fileOutputStream.close();
inputStream.close();
startCropImage();
} catch (Exception e) {
Log.e(TAG, "Error while creating temp file", e);
}
break;
case REQUEST_CODE_TAKE_PICTURE:
startCropImage();
break;
case REQUEST_CODE_CROP_IMAGE:
String path = data.getStringExtra(CropImage.IMAGE_PATH);
if (path == null) {
return;
}
bitmap = BitmapFactory.decodeFile(mFileTemp.getPath());
mImageView.setImageBitmap(bitmap);
break;
}
super.onActivityResult(requestCode, resultCode, data);
}
public static void copyStream(InputStream input, OutputStream output)
throws IOException {
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = input.read(buffer)) != -1) {
output.write(buffer, 0, bytesRead);
}
}
}
错误堆栈如下：
12-22 23:11:03.372: E/AndroidRuntime(3617): java.lang.RuntimeException: Canvas: trying to use a recycled bitmap android.graphics.Bitmap@41bd8728
12-22 23:11:03.372: E/AndroidRuntime(3617): at android.graphics.Canvas.throwIfRecycled(Canvas.java:1026)
12-22 23:11:03.372: E/AndroidRuntime(3617): at android.graphics.Canvas.drawBitmap(Canvas.java:1096)
12-22 23:11:03.372: E/AndroidRuntime(3617): at android.graphics.Bitmap.createBitmap(Bitmap.java:625)
12-22 23:11:03.372: E/AndroidRuntime(3617): at eu.janmuller.android.simplecropimage.CropImage$1.prepareBitmap(CropImage.java:572)
12-22 23:11:03.372: E/AndroidRuntime(3617): at eu.janmuller.android.simplecropimage.CropImage$1.run(CropImage.java:578)
12-22 23:11:03.372: E/AndroidRuntime(3617): at eu.janmuller.android.simplecropimage.CropImage$6.run(CropImage.java:285)
12-22 23:11:03.372: E/AndroidRuntime(3617): at eu.janmuller.android.simplecropimage.Util$BackgroundJob.run(Util.java:175)
12-22 23:11:03.372: E/AndroidRuntime(3617): at java.lang.Thread.run(Thread.java:838)
提前致谢。
答案 0 :(得分：1)
您正在尝试绘制已经回收的位图。看起来它意味着你用来裁剪图像 - 它重写了一个已被破坏的位图。我的猜测是库有一个错误，它在onStop中回收位图以提高效率，但是没有意识到Bitmap仍然可以被库中的AsyncTask或Thread使用，而且它们不会检查看它是否先回收。您可以通过添加一些isRecycled（）检查来修复他的库，但我的猜测还有其他竞争条件。您可以通过将configChanges行添加到他的图书馆活动中来修复它，这样他们就不会在轮换中进行活动重建。
但问题出在他的图书馆，而不是你的代码。