我正在尝试启动一个android相机意图和一个选择照片意图（两个按钮，一个用于拍照，一个用于从图库中选择），并且都需要在它们之后启动一个裁剪意图，然后将裁剪的照片返回到我的应用程序活动中。我已经看过了很多贴在其他地方的例子，但是我的实现有了奇怪的结果。
对于拍照事件，它似乎工作正常，除了拍照并进入裁剪模式后，会弹出错误的照片。你拍的照片不是裁剪的，而是裁剪了一张旧照片，我不知道它是从哪里来的。此外，有时在完成裁剪意图之后，它会在parcel.readexception之后由于nullpointereexception而崩溃（不能总是复制，但我认为如果您拍摄一张照片并尽快裁剪，它会出现更多问题）。
对于“选择照片”的意图，您的图库会按预期弹出，但在选择照片时，所发生的一切都是“保存”的消息将被烤熟，而不是返回到我的应用程序的活动与图像。我相信我对choose photo intent的工作原理有一个误解（我几乎重用了拍照意图的代码）。
在这两种情况下，在裁剪模式下，尽管指定了“scale”=false，仍允许调整裁剪区域的大小。
我的代码如下：
public class TestPhotoActivity extends Activity {
private ImageView imageView;
private Uri imageUri;
private int int_Height_crop = 600;
private int int_Width_crop = 600;
public final static int TAKE_PICTURE = 0;
public final static int CHOOSE_PICTURE = 1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.choose_photo);
imageView = (ImageView) findViewById(R.id.photo);
Button take_photo = (Button) findViewById(R.id.take_photo);
take_photo.setOnClickListener(new View.OnClickListener() {
public void onClick(final View view) {
takePhoto(view);
}
});
Button choose_photo = (Button) findViewById(R.id.choose_photo);
choose_photo.setOnClickListener(new View.OnClickListener() {
public void onClick(final View view) {
choosePhoto(view);
}
});
}
public void takePhoto(View view) {
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE", null);
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", int_Width_crop);
intent.putExtra("outputY", int_Height_crop);
intent.putExtra("scale", false);
intent.putExtra("return-data", true);
File photo = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photo));
imageUri = Uri.fromFile(photo);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
intent.putExtra("noFaceDetection", true);
startActivityForResult(intent, TAKE_PICTURE);
}
public void choosePhoto(View view) {
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setType("image/*");
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("outputX", int_Width_crop);
intent.putExtra("outputY", int_Height_crop);
intent.putExtra("scale", false);
intent.putExtra("return-data", true);
File photo = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + "Pic.jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photo));
imageUri = Uri.fromFile(photo);
intent.putExtra("outputFormat", Bitmap.CompressFormat.JPEG.toString());
startActivityForResult(intent, CHOOSE_PICTURE);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case TAKE_PICTURE:
Log.d("photo", "requestCode: " + requestCode + "resultCode: " + resultCode + "wanted result: " + Activity.RESULT_OK);
if (resultCode == Activity.RESULT_OK) {
if (data == null) {
Log.w("photo", "Null data, but RESULT_OK, from image picker!");
Toast t = Toast.makeText(this, "No photo picked.", Toast.LENGTH_SHORT);
t.show();
return;
}
final Bundle extras = data.getExtras();
if (extras != null) {
Log.d("photo", "extras is not null");
Uri selectedImage = imageUri;
getContentResolver().notifyChange(selectedImage, null);
ContentResolver cr = getContentResolver();
Bitmap bitmap;
try {
bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, selectedImage);
Log.d("photo", "data.getAction() is not null. setting image.");
imageView.setImageBitmap(bitmap);
} catch (Exception e) {
Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT).show();
Log.e("photo", e.toString());
}
}
}
case CHOOSE_PICTURE:
Log.d("photo", "requestCode: " + requestCode + "resultCode: " + resultCode + "wanted result: " + Activity.RESULT_OK);
if(resultCode == RESULT_OK){
Log.d("photo", "resultCode is ok");
if (data == null) {
Log.w("photo", "Null data, but RESULT_OK, from image picker!");
Toast t = Toast.makeText(this, "No photo picked.", Toast.LENGTH_SHORT);
t.show();
return;
}
final Bundle extras = data.getExtras();
if (extras != null) {
Log.d("photo", "extras is not null");
Uri selectedImage = imageUri;
getContentResolver().notifyChange(selectedImage, null);
ContentResolver cr = getContentResolver();
Bitmap bitmap;
try {
bitmap = android.provider.MediaStore.Images.Media.getBitmap(cr, selectedImage);
Log.d("photo", "data.getAction() is not null. setting image.");
imageView.setImageBitmap(bitmap);
} catch (Exception e) {
Toast.makeText(this, "Failed to load", Toast.LENGTH_SHORT).show();
Log.e("photo", e.toString());
}
}
}
}
}
}
非常感谢您的帮助！
编辑：我还应该注意，我正在测试lg optimus lte，android 2.3
最佳答案
我认为您的问题来自于在临时文件名中使用system.currentTimeMillis（）。这可以解释为什么有时会得到一个旧文件。
我建议重复使用同一个临时文件。
希望有帮助…