我尝试从相机拍摄照片,然后我尝试使用我在下面写过的two files
方法帮助访问另一个活动中创建的fileProvider()
这些{但是我的坏了总是在接收点显示我为null。有人可以帮助我如何访问在这里创建的不同活动中的文件吗?
public class FileGenerator extends Activity {
File image1,image2,image3,image4;
private String imagePath1,imagePath2,imagePath3,imagePath4;
....................
.........................
public void cameraShot() // This method would be called when the user clicks on a button on my activity to make a request of taking pic.
{
ContentValues values = new ContentValues();
Intent intentPicture = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//startActivityForResult(intentPicture,ACTION_TAKE_PICTURE);
Intent intent=new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
if(flipvalue == 0)
{
intentPicture.putExtra(MediaStore.EXTRA_OUTPUT, firstCapturedImageURI);
values.put(MediaStore.Images.Media.TITLE, "testingimage1.jpg");
firstCapturedImageURI = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
startActivityForResult(intentPicture,CAMERA_DATA_FIRST);
}
if(flipvalue == 1)
{
intentPicture.putExtra(MediaStore.EXTRA_OUTPUT, secondCapturedImageURI);
values.put(MediaStore.Images.Media.TITLE, "testingimage2.jpg");
secondCapturedImageURI = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
startActivityForResult(intentPicture,CAMERA_DATA_SECOND);
}
}
protected void onActivityResult(int requestCode, int resultCode,Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if(resultCode==RESULT_OK)
{
Bundle extras= data.getExtras();
if(requestCode == 0)
{
if(bitMap1 != null)
bitMap1.recycle();
bitMap1 = (Bitmap)extras.get("data");
imageView1.setImageBitmap(bitMap1);
selectedImagePath1 = getRealPathFromURI(firstCapturedImageURI);
imagePath1 = selectedImagePath1;
Log.d("Pic Path>>>", selectedImagePath1);
image1 = new File(selectedImagePath1);
flipvalue =1;
}
if (requestCode == 1)
{
if(bitMap2 != null)
bitMap2.recycle();
bitMap2 = (Bitmap)extras.get("data");
imageView2.setImageBitmap(bitMap2);
selectedImagePath2 = getRealPathFromURI(secondCapturedImageURI);
imagePath2 = selectedImagePath2;
Log.d("Pic Path>>>", selectedImagePath2);
image2 = new File(selectedImagePath2);
flipvalue =2;
}
}
protected File fileProvider(int i)
{
if(i==1)
return image1;
else
return image2;
}
public String getRealPathFromURI(Uri contentUri)
{
try
{
String[] proj = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
catch (Exception e)
{
return contentUri.getPath();
}
}
}
以下是我尝试接收这些文件的活动。
public class FileReceiver extends Activity{
File receivedimage1, receivedimage2;
FileGenerator filegen = new FileGenerator();
..........................
............................
receivedimage1 = filegen.fileProvider(1);
Log.d("File 1 ","file1 object"+receivedimage1);// always shows null
receivedimage2 = filegen.fileProvider(2);
Log.d("File 2 ","file2 object"+receivedimage2);// shows null
}
P.S。 - 在尝试此操作之前,我曾经将字符串(即selectedImagePath1, selectedImagePath2
)带到另一个活动,然后使用这些字符串创建文件。但不知道为什么这会以某种方式破坏我创建的图像文件。所以,我按照上面的代码方式,仍然没有运气。
答案 0 :(得分:1)
您将需要使用Intent将文件路径发送到其他活动,如果您有两个以上的Activity,则使用SharedPreferences进行Stroring文件路径并从SharedPreferences中查找其他活动中的路径。您可以将SharedPreferences中的路径存储为:
SharedPreferences pathPrefs = FileGenerator.this.getSharedPreferences(
"filepathPrefs", MODE_WORLD_READABLE);
SharedPreferences.Editor prefsEditor = pathPrefs.edit();
prefsEditor.putString("image1",image1.getAbsolutePath().toString());
prefsEditor.putString("image2",image2.getAbsolutePath().toString());
prefsEditor.commit();
并在其他活动中从SharedPreferences获取文件路径:
SharedPreferences pathPrefs =
this.getSharedPreferences("filepathPrefs", MODE_WORLD_READABLE);
String image1 = pathPrefs.getString("image1", "defaultpath");
String image2 = pathPrefs.getString("image2", "defaultpath");
// now use both file path in your code..