A View that let you draw freely on it. You can customize paint width, alpha and color. Can be useful for notes app, signatures or hands-free writing
This View works flawlessly inside Scrolling parents like NestedScrollView. Be careful with lists, you need to restore manually the draw state!
Also supports state-restore on rotation, with custom behaviours like "clear, crop or fitXY" and you can take a screenshot (given to you as a Bitmap Object) of the View drawn content
You can try the demo app on google play store.
coming soon
Or see the full video demo on YouTube.
https://youtu.be/ejEdq4lnPjc
compile 'com.rm:freedrawview:1.1.2'Min SDK version: 9 (Android 2.3)
To use this library, just add this inside your layout file
<com.rm.freedrawview.FreeDrawView
android:id="@+id/your_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
app:paintAlpha="255"
app:paintColor="@color/black"
app:paintWidth="4dp"
app:resizeBehaviour="crop"/>... if you need to use this View's custom xml attributes (shown in a table below or in the example above) do not forget to add this to your root layout
xmlns:app="http://schemas.android.com/apk/res-auto"
And this in your Activity
public class MainActivity extends AppCompatActivity {
FreeDrawView mSignatureView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSignatureView = (FreeDrawView) findViewById(R.id.your_id);
// Setup the View
mSignatureView.setPaintColor(Color.BLACK);
mSignatureView.setPaintWidthPx(getResources.getDimensionPixelSize(R.dimen.paint_width));
//mSignatureView.setPaintWidthPx(12);
mSignatureView.setPaintWidthDp(getResources.getDimension(R.dimen.paint_width));
//mSignatureView.setPaintWidthDp(6);
mSignatureView.setPaintAlpha(255);// from 0 to 255
mSignatureView.setResizeBehaviour(ResizeBehaviour.CROP);// Must be one of ResizeBehaviour
// values;
// This listener will be notified every time the path done and undone count changes
mSignatureView.setPathRedoUndoCountChangeListener(new PathRedoUndoCountChangeListener() {
@Override
public void onUndoCountChanged(int undoCount) {
// The undoCount is the number of the paths that can be undone
}
@Override
public void onRedoCountChanged(int redoCount) {
// The redoCount is the number of path removed that can be redrawn
}
});
// This listener will be notified every time a new path has been drawn
mSignatureView.setOnPathDrawnListener(new PathDrawnListener() {
@Override
public void onNewPathDrawn() {
// The user has finished drawing a path
}
@Override
public void onPathStart() {
// The user has started drawing a path
}
});
// This will take a screenshot of the current drawn content of the view
mSignatureView.getDrawScreenshot(new FreeDrawView.DrawCreatorListener() {
@Override
public void onDrawCreated(Bitmap draw) {
// The draw Bitmap is the drawn content of the View
}
@Override
public void onDrawCreationError() {
// Something went wrong creating the bitmap, should never
// happen unless the async task has been canceled
}
});
}
}From v1.1.0 you can get the current state of the Draw (as a Serializable object) and than restore it:
FreeDrawSerializableState state = mSignatureView.getCurrentViewStateAsSerializable();// This returns a FreeDrawSerializableState (which implements Serializable)
// Save this "state" object into a file or keep it where you want
mSignatureView.restoreStateFromSerializable(state);// Restore the state of the view
// Now all the previous paths and points have been restored (including the history)To save this Serializable Object inside a file you can take a look at the class FileHelper
| XML Attribute | Java method | Description | Default value |
|---|---|---|---|
| paintColor | setPaintColor(@ColorInt int checked) | Set the color of the paint | Color.BLACK |
| paintWidth | setPaintWidthPx(@FloatRange(from = 0) float widthPx) | Set the width of the paint in pixels | 4dp |
| setPaintWidthDp(float dp) | Set the width of the paint in dp | 4dp | |
| paintAlpha | setPaintAlpha(@IntRange(from = 0, to = 255) int alpha) | Set the alpha of the paint | 255 |
| resizeBehaviour | setResizeBehaviour(ResizeBehaviour newBehaviour) | The behaviour of the view every time it is resized (on rotation for example) one of [clear, fitXY, crop] | ResizeBehaviour.CROP |
- Multitouch drawing is currently not supported
- Eraser is not yet implemented
Manually restore state is not supported- Get the draw screenshot from a FreeDrawSerializableState without adding the view
Also, the FreeDrawView class gives some utility methods to handle path history:
public void undoLast()
This method undo the last drawn segment
public void redoLast()
This method redraw the last undone segment
public void undoAll()
This method undo all the drawn segments, they can be redone one by one or all in one
public void redoAll()
This method redraw all the undone segments
public void clearHistory()
This method removes all the history segments (The one that could be redone)
public void clearDraw()
This method removes all the current drawn segments, without adding them to the history
public void clearDrawAndHistory()
This method removes all the current drawn segments and clears the history
public int getPathCount(boolean includeCurrentlyDrawingPath)
This method returns the current number of segments drawn
You can use:
setOnPathDrawnListener(PathDrawnListener listener)
to be notified every time the user starts or finishes drawing a line.
setPathRedoUndoCountChangeListener(PathRedoUndoCountChangeListener listener)
to be notified when the undo or redo count changes.
And remove them with:
removePathDrawnListener()removePathRedoUndoCountChangeListener()
Copyright 2017 Riccardo Moro.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.