我有一个应用程序，它从手机摄像头拍摄照片并将路径作为TEXT存储在sqlite数据库中。我正在从数据库中检索字符串并解析它，并且由于某种原因它没有显示在ImageView中。以下是所有相关代码。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_student_detail);
editTextName = (EditText) findViewById(R.id.editTextName);
editTextEmail = (EditText) findViewById(R.id.editTextEmail);
editTextBirthdate = (EditText) findViewById(R.id.editTextBirthdate);
editTextAge = (EditText) findViewById(R.id.editTextAge);
imageViewStudentImage=(ImageView)findViewById(R.id.imageViewStudent);
_Student_Id = 0;
Intent intent = getIntent();
_Student_Id = intent.getIntExtra("student_Id", 0);
StudentRepo repo = new StudentRepo(this);
Student student;
student = repo.getStudentById(_Student_Id);
editTextBirthdate.setText(student.bd);
editTextName.setText(student.name);
editTextEmail.setText(student.email);
//Display Image Here
if (student.imagepath !=null) imageViewStudentImage.setImageURI(Uri.parse(student.imagepath));
editTextAge.setText(CalculateAge(ConvertDate(student.bd)).toString());
}
URI是file：///storage/emulated/0/Pictures/MyCameraApp/IMG_20150525_124520.jpg
有趣的是我在手机上的Gallery应用程序中找不到图像，但我可以使用我的文件浏览器应用找到。图像在手机上显示正确。
以下是存储URI的代码
public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;
private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100;
private Uri fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
private void Save(){
if (!editTextName.getText().toString().isEmpty()) {
StudentRepo repo = new StudentRepo(this);
Student student = new Student();
student.imagepath = fileUri.toString();
if (!editTextBirthdate.getText().toString().isEmpty()) {
student.bd = editTextBirthdate.getText().toString();
} else {
student.bd = "";
}
if (!editTextEmail.getText().toString().isEmpty()) {
student.email = editTextEmail.getText().toString();
} else {
student.email = "";
}
student.name = editTextName.getText().toString();
student.student_ID = _Student_Id;
if (_Student_Id == 0) {
_Student_Id = repo.insert(student);
Toast.makeText(this, "New Student Inserted", Toast.LENGTH_SHORT).show();
} else {
repo.update(student);
Toast.makeText(this, "Student Record updated", Toast.LENGTH_SHORT).show();
}
}
}
private void TakePicture(){
// create Intent to take a picture and return control to the calling application
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file name
// start the image capture Intent
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
/** Create a file Uri for saving an image or video */
private static Uri getOutputMediaFileUri(int type){
return Uri.fromFile(getOutputMediaFile(type));
}
/** Create a File for saving an image or video */
private static File getOutputMediaFile(int type){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "MyCameraApp");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ timeStamp + ".jpg");
} else if(type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"VID_"+ timeStamp + ".mp4");
} else {
return null;
}
return mediaFile;
}
有人可以帮我弄清楚为什么ImageView不会显示图像吗？
编辑：
我刚刚发现了这个......
05-25 13:42:37.954 27938-27938/com.x.xxx W/ImageView﹕ Unable to open content: file:///storage/emulated/0/Pictures/MyCameraApp/IMG_20150525_124520.jpg
java.io.FileNotFoundException: /storage/emulated/0/Pictures/MyCameraApp/IMG_20150525_124520.jpg: open failed: ENOENT (No such file or directory)
at libcore.io.IoBridge.open(IoBridge.java:456)
at java.io.FileInputStream.<init>(FileInputStream.java:76)
at java.io.FileInputStream.<init>(FileInputStream.java:103)
at android.content.ContentResolver.openInputStream(ContentResolver.java:650)
at android.widget.ImageView.resolveUri(ImageView.java:778)
at android.widget.ImageView.setImageURI(ImageView.java:440)
at com.xx.xx.StudentDetail.onCreate(StudentDetail.java:60)
at android.app.Activity.performCreate(Activity.java:6221)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2614)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2728)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5837)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1388)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183)
Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
at libcore.io.Posix.open(Native Method)
at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
at libcore.io.IoBridge.open(IoBridge.java:442)
at java.io.FileInputStream.<init>(FileInputStream.java:76)
at java.io.FileInputStream.<init>(FileInputStream.java:103)
at android.content.ContentResolver.openInputStream(ContentResolver.java:650)
at android.widget.ImageView.resolveUri(ImageView.java:778)
at android.widget.ImageView.setImageURI(ImageView.java:440)
at com.xx.xx.StudentDetail.onCreate(StudentDetail.java:60)
at android.app.Activity.performCreate(Activity.java:6221)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2614)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2728)
at android.app.ActivityThread.access$900(ActivityThread.java:172)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1421)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5837)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1388)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1183)
05-25 13:42:37.954 27938-27938/com.xx.xxI/System.out﹕ resolveUri failed on bad bitmap uri: file:///storage/emulated/0/Pictures/MyCameraApp/IMG_20150525_124520.jpg
显然它无法找到文件夹和/或图像。处理这个问题的最佳方法是什么？据我所知，将图像存储为BLOBS也不是一个好主意。
答案 0 :(得分：0)
相对于“MyCameraApp”目录保存文件名是更好的选择。 您可以将目录设为
Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES).getAbsolutePath()
+ "/MyCameraApp/";
您可以在路径后附加文件名。 你可以这样打开它。
File file = new File(path) ;
if (!file.exists()) {
Toast.makeText(activity,R.string.file_deleted,Toast.LENGTH_SHORT).show();
return;
}
Intent openIntent = new Intent(Intent.ACTION_VIEW);
openIntent.setDataAndType(Uri.fromFile(file), file.getMimeType());
PackageManager manager = activity.getPackageManager();
List<ResolveInfo> infos = manager.queryIntentActivities(openIntent, 0);
if (infos.size() > 0) {
getContext().startActivity(openIntent);
} else {
Toast.makeText(activity,R.string.no_application_found_to_open_file,Toast.LENGTH_SHORT).show();
}