删除图像文件会创建一个具有相同名称的0字节文件
当我从图库中删除文件时，它将删除但是将创建一个具有相同图像名称的文件，其大小为0字节！该文件将在库中显示为已损坏的图像！请帮帮我！
public void browse(View v)
{
//This Method is for Browse Button OnClick to get an Image
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,
"Select Picture"), SELECT_PICTURE);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
File imgFile = new File(selectedImagePath);
//Deleting Image
imgFile.delete();
//Update Android Gallery to remove Image immediately
MediaScannerConnection.scanFile(this,
new String[] { imgFile.getAbsolutePath() }, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
}
}
);
}
}
}
public String getPath(Uri uri) {
if( uri == null ) {
return null;
}
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
if( cursor != null ){
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
return uri.getPath();
}
这是我的全班： （browse（）方法将获取一个图像，start（）方法将压缩它并保存为新文件，然后尝试删除出现问题的原始图像：
public class Lab extends Activity {
int counter = 0;
long lastModDate;
public static String parent;
public static int deg = 0;
public static String f_or = "";
public static String f_ta = "";
public static String f_original_Image_dim = "";
private static final int SELECT_PICTURE = 1;
private String selectedImagePath;
Timer timer1;
Bitmap myBitmap;
int currentFormula = 3;
TouchImageView iv1;
TextView l1;
Button btn3;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_lab);
l1 = (TextView) findViewById(R.id.txtl1);
iv1 = (TouchImageView) findViewById(R.id.iv_selectedpic);
}
public void zard(View v)
{
l1.setText("F = A");
currentFormula = 1;
}
public void ghermez(View v)
{
l1.setText("F = B");
currentFormula = 2;
}
public void sabz(View v)
{
l1.setText("F = C");
currentFormula = 3;
}
public void next(View v)
{
Intent i = new Intent(Lab.this, Resoflab.class);
startActivity(i);
}
public void browse(View v)
{
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent,
"Select Picture"), SELECT_PICTURE);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
File imgFile = new File(selectedImagePath);
lastModDate = imgFile.lastModified();
try
{
if(imgFile.exists()){
counter = 0;
Resoflab.de = 0;
System.gc();
BitmapFactory.Options optionss = new BitmapFactory.Options();
optionss.inPreferredConfig = Bitmap.Config.RGB_565;
optionss.inScaled = false;
myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath(),optionss);
ExifInterface exif = new ExifInterface(selectedImagePath);
int rotation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL);
int rotationInDegrees = exifToDegrees(rotation);
deg = rotationInDegrees;
Matrix matrix = new Matrix();
if (rotation != 0f) {
matrix.preRotate(rotationInDegrees);
myBitmap = Bitmap.createBitmap(myBitmap, 0, 0, myBitmap.getWidth(), myBitmap.getHeight(), matrix, true);
}
f_original_Image_dim = myBitmap.getWidth() + "*" + myBitmap.getHeight();
iv1.setImageBitmap(myBitmap);
//TouchImageview not displayed image after setImageBitmap so I set setZoom(1) after some miliseconds and its OK now
//This is why I used timer
timer1 = new Timer();
timer1.schedule(new TimerTask() {
@Override
public void run() {
TimerMethod1();
}
}, 0, 300);
//iv2.setImageBitmap(myBitmap);
}
}
catch(Exception ee)
{
Toast.makeText(Lab.this,getResources().getString(R.string.khateyezir) + "\n\n" + ee.toString(),Toast.LENGTH_LONG).show();
}
}
else
{
//btn3.setVisibility(View.GONE);
}
}
}
private void TimerMethod1()
{
this.runOnUiThread(Timer_Tick1);
}
private Runnable Timer_Tick1 = new Runnable() {
public void run() {
try
{
counter++;
iv1.setZoom(1);
if(counter == 4)
{
counter = 0;
timer1.cancel();
}
}
catch(Exception e)
{
}
}
};
public void start(View v)
{
try
{
if(selectedImagePath.contains("_optimizes_"))
{
//Toast that Image had been optimized
Toast.makeText(Lab.this,getResources().getString(R.string.isoptimized),Toast.LENGTH_LONG).show();
return;
}
String fm = "C";
if(currentFormula == 2)fm = "B";
if(currentFormula == 1)fm = "A";
File file = new File(selectedImagePath);
if(file.exists() == false)
{
Toast.makeText(Lab.this,getResources().getString(R.string.hasdeleted),Toast.LENGTH_LONG).show();
return;
}
parent = file.getParent();
String name = file.getName();
String extension = FileUtils.getExtension(name);
String fileNameWithOutExt = FileUtils.removeExtension(name);
String Targetname = fileNameWithOutExt + "_optimizes_" + fm + "." + extension;
String TargetPath = parent + "/" + Targetname;
File Tfile = new File(parent, Targetname);
FileOutputStream outStream = new FileOutputStream(Tfile);
if(currentFormula == 3)
myBitmap.compress(Bitmap.CompressFormat.JPEG, 70, outStream);
else if(currentFormula == 2)
myBitmap.compress(Bitmap.CompressFormat.JPEG, 90, outStream);
else myBitmap.compress(Bitmap.CompressFormat.JPEG, 80, outStream);
outStream.flush();
outStream.close();
Tfile.setLastModified(lastModDate);
//sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://" + Tfile)));
//SingleMediaScanner sc = new SingleMediaScanner(Lab.this, Tfile);
String Tfilepath = Tfile.getAbsolutePath();
String filepath = file.getAbsolutePath();
//HERE IS MY PROBLEM:
file.delete();
MediaScannerConnection.scanFile(this,
new String[] { Tfilepath, filepath}, null,
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
//now visible in gallery
}
}
);
//f_ta = TargetPath;
//f_original_Image_dim = selectedImagePath;
//Intent i = new Intent(Lab.this, Resoflab.class);
//startActivity(i);
}
catch(Exception ee)
{
Toast.makeText(Lab.this,getResources().getString(R.string.khateyezir) + "\n\n" + ee.toString(),Toast.LENGTH_LONG).show();
}
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
//btn3.setVisibility(View.GONE);
}
public String getPath(Uri uri) {
if( uri == null ) {
return null;
}
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
if( cursor != null ){
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String ret = cursor.getString(column_index);
cursor.close();
return ret;
}
return uri.getPath();
}
private static int exifToDegrees(int exifOrientation) {
if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_90) { return 90; }
else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_180) { return 180; }
else if (exifOrientation == ExifInterface.ORIENTATION_ROTATE_270) { return 270; }
return 0;
}
}
2 个答案:
答案 0 :(得分：1)
删除图片后，例如通过调用myfile.delete（），我们必须将其从mediaStore中删除，这是从媒体商店删除文件的功能：
public static void deleteFileFromMediaStore(final ContentResolver contentResolver, final File file) {
String canonicalPath;
try {
canonicalPath = file.getCanonicalPath();
} catch (IOException e) {
canonicalPath = file.getAbsolutePath();
}
final Uri uri = MediaStore.Files.getContentUri("external");
final int result = contentResolver.delete(uri,
MediaStore.Files.FileColumns.DATA + "=?", new String[] {canonicalPath});
if (result == 0) {
final String absolutePath = file.getAbsolutePath();
if (!absolutePath.equals(canonicalPath)) {
contentResolver.delete(uri,
MediaStore.Files.FileColumns.DATA + "=?", new String[]{absolutePath});
}
}
}
答案 1 :(得分：0)
尝试使用：
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == SELECT_PICTURE) {
Uri selectedImageUri = data.getData();
selectedImagePath = getPath(selectedImageUri);
File imgFile = new File(selectedImagePath);
String imgFilePath = imgFile.getAbsolutePath(); // <-- Add this
//Deleting Image
imgFile.delete();
//Update Android Gallery to remove Image immediately
MediaScannerConnection.scanFile(this,
new String[] { imgFilePath }, null, // <-- change this
new MediaScannerConnection.OnScanCompletedListener() {
public void onScanCompleted(String path, Uri uri) {
}
}
);
}
}
}
修改
尝试使用此机制，它将更新图库：
sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
将此添加到您的应用程序清单：
<intent-filter>
<action android:name="android.intent.action.MEDIA_MOUNTED" />
<data android:scheme="file" />
</intent-filter>
修改
public String getPath(Uri uri) {
if( uri == null ) {
return null;
}
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
if( cursor != null ){
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
String path = cursor.getString(column_index); //<-- Add this
cursor.close(); //<-- Add this
return path; //<-- change this
}
return uri.getPath();
}
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