我正在尝试在捕获的图像上显示日期和时间。我有一个类作为Capturesignature。我们可以在捕获的图像上绘制。如何在捕获的图像上显示日期和时间。
public class CaptureSignature extends Activity {
signature mSignature;
Paint paint;
LinearLayout mContent;
Button clear, save,captureImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.capturesignature);
save = (Button) findViewById(R.id.save);
save.setEnabled(false);
clear = (Button) findViewById(R.id.clear);
mContent = (LinearLayout) findViewById(R.id.mysignature);
captureImage = (Button) findViewById(R.id.photo);
mSignature = new signature(this, null);
mContent.addView(mSignature,
LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT);
save.setOnClickListener(onButtonClick);
clear.setOnClickListener(onButtonClick);
//Image capture
captureImage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (currentImageUri == null) {
currentImageUri = getImageFileUri();
System.out.println("imagePath :" + currentImageUri);
}
Intent intent = new
Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, currentImageUri);
// start the image capture Intent
startActivityForResult(intent, 1);
}
});
}
Button.OnClickListener onButtonClick = new
Button.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (v == clear) {
mSignature.clear();
} else if (v == save) {
mSignature.save();
}
}
};
public class signature extends View {
static final float STROKE_WIDTH = 2f;
static final float HALF_STROKE_WIDTH = STROKE_WIDTH / 2;
Paint paint = new Paint();
Path path = new Path();
float lastTouchX;
float lastTouchY;
final RectF dirtyRect = new RectF();
private float y;
public signature(Context context, AttributeSet attrs) {
super(context, attrs);
paint.setAntiAlias(true);
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(STROKE_WIDTH);
}
public void clear() {
path.reset();
invalidate();
save.setEnabled(false);
}
public void save() {
Bitmap returnedBitmap =
Bitmap.createBitmap(mContent.getWidth(),
mContent.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(returnedBitmap);
try {
FileOutputStream mFileOutStream = new
FileOutputStream(mypath);
returnedBitmap.compress(Bitmap.CompressFormat.PNG, 90,
mFileOutStream);
mFileOutStream.flush();
mFileOutStream.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Drawable bgDrawable = mContent.getBackground();
if (bgDrawable != null)
bgDrawable.draw(canvas);
else
canvas.drawColor(Color.WHITE);
mContent.draw(canvas);
ByteArrayOutputStream bs = new ByteArrayOutputStream();
returnedBitmap.compress(Bitmap.CompressFormat.PNG, 50, bs);
Intent intent = new Intent();
intent.putExtra("byteArray", bs.toByteArray());
setResult(1, intent);
finish();
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
canvas.drawPath(path, paint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float eventX = event.getX();
float eventY = event.getY();
save.setEnabled(true);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
path.moveTo(eventX, eventY);
lastTouchX = eventX;
lastTouchY = eventY;
return true;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
resetDirtyRect(eventX, eventY);
int historySize = event.getHistorySize();
for (int i = 0; i < historySize; i++) {
float historicalX = event.getHistoricalX(i);
float historicalY = event.getHistoricalY(i);
path.lineTo(historicalX, historicalY);
}
path.lineTo(eventX, eventY);
break;
}
invalidate((int) (dirtyRect.left - HALF_STROKE_WIDTH),
(int) (dirtyRect.top - HALF_STROKE_WIDTH),
(int) (dirtyRect.right + HALF_STROKE_WIDTH),
(int) (dirtyRect.bottom + HALF_STROKE_WIDTH));
lastTouchX = eventX;
lastTouchY = eventY;
return true;
}
private void resetDirtyRect(float eventX, float eventY) {
dirtyRect.left = Math.min(lastTouchX, eventX);
dirtyRect.right = Math.max(lastTouchX, eventX);
dirtyRect.top = Math.min(lastTouchY, eventY);
dirtyRect.bottom = Math.max(lastTouchY, eventY);
}
}
//code for taking picture taking picture
//taking picture
private static Uri getImageFileUri() {
imagePath = new File(
Environment.getExternalStoragePublicDirectory
(Environment.DIRECTORY_PICTURES),
"Tuxuri");
if (!imagePath.exists()) {
if (!imagePath.mkdirs()) {
Log.d("CameraTestIntent", "failed to create
directory");
return null;
}
}
// Create an image file name
String timeStamp = new
SimpleDateFormat("yyyyMMdd_HHmmss")
.format(new Date());
File image = new File(imagePath, "TUX_" + timeStamp +
".jpg");
if (!image.exists()) {
try {
image.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("uriPath :" + image + " " +
Uri.fromFile(image));
// Create an File Uri
return Uri.fromFile(image);
}
protected void onActivityResult(int requestCode, int
resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
try {
if (requestCode == 1) {
// System.out.println("Step-2222 : " + iview);
String img = currentImageUri.toString();
String s[] = img.split("/");
String s1 = s[s.length - 1];
String s2 = "/" + "mnt" + "/" + "sdcard" + "/"
+ "pictures"
+ "/" + "Tuxuri" + "/" + s1;
System.out.println("Step:" + s2);
picturePath = s2;
bitampimage = BitmapFactory.decodeFile(s2);
bit = Bitmap.createScaledBitmap(bitampimage,
80, 80, true);
System.out.println("Step" + picturePath);
currentImageUri = null;
//settung image
if(bitampimage != null){
Drawable d = new
BitmapDrawable(getResources(),bitampimage);
mSignature.setBackgroundDrawable(d);
}
mContent.addView(mSignature,LayoutParams.FILL_PARENT,
LayoutParams.FILL_PARENT);
}
} catch (Exception er) {
er.printStackTrace();
}
}
}
我已经尝试过这些代码行，用于获取图像上的日期和时间，但是没有用。所以我该怎么做？
@Override
public void onDraw(Canvas canvas){
canvas.drawBitmap(cameraImage, 0, 0, paint);
// draw the date
canvas.drawText("Date string", x, y, paint);
}
答案 0 :(得分：0)
您可以尝试这样的事情：
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
String currentDateandTime = sdf.format(new Date());
canvas.drawText(currentDateandTime , 10, 25, paint);
问候。