I am trying to make custom Views in android I mention all my arrtrs list in MainActivity and the XML file but I there is an error in main.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:custom="http://schemas.android.com/apk/res/com.example.customviews.piechart"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.example.customviews.charting.piechart.MainActivity
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
custom:titleText="Background color"
custom:valueColor="#android:color/holo_green_light"
/>
</LinearLayout>
Do you have a constructor with no arguments?
You should add a constructor like:
public MainActivity(Context context, AttributeSet attrs) {
super(context, attrs);
}
or
public MainActivity(Context context) {
super(context);
}
You asked for a simple example of a custom view:
public class BirdView extends ImageView {
private float direction = 0;
Paint paint = new Paint();
public BirdView(Context context) {
super(context);
}
public BirdView(Context context, AttributeSet attrs) {
super(context, attrs);
paint.setColor(Color.WHITE);
paint.setStrokeWidth(6);
}
public BirdView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),
MeasureSpec.getSize(heightMeasureSpec));
}
#Override
public void draw(Canvas canvas) {
canvas.save();
int stratX = getWidth() / 2;
int startY = getHeight() / 2;
canvas.rotate(direction, stratX, startY);
super.draw(canvas);
canvas.restore();
canvas.drawLine(stratX, startY, stratX, startY + 80, paint);
}
public void update(float dir) {
direction = dir;
invalidate();
}
}
Related
i m adding diagonal cut layout to RecyclerView, but i m not getting expected result. my second view start with end of first view, and thats obvious. but what i want is that each view is join with each-other like this.
My Output:
and this is what i wanted:
CutLayout.class:
public class CutLayout extends FrameLayout {
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
private Xfermode pdMode = new PorterDuffXfermode(PorterDuff.Mode.CLEAR);
private Path path = new Path();
public CutLayout(Context context) {
super(context);
}
public CutLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CutLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public CutLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
protected void dispatchDraw(Canvas canvas) {
int saveCount = canvas.saveLayer(0, 0, getWidth(), getHeight(), null, Canvas.ALL_SAVE_FLAG);
super.dispatchDraw(canvas);
paint.setXfermode(pdMode);
path.reset();
path.moveTo(0, getHeight());
path.lineTo(getWidth(), getHeight());
path.lineTo(getWidth(), getHeight() - TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, getResources().getDisplayMetrics()));
path.close();
canvas.drawPath(path, paint);
canvas.restoreToCount(saveCount);
paint.setXfermode(null);
}
}
item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".SampleActivity">
<com.yarolegovich.slidingrootnav.sample.helper.CutLayout
android:layout_width="match_parent"
android:layout_height="200dp">
<ImageView
android:scaleType="centerCrop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:src="#drawable/homebulding" />
</com.yarolegovich.slidingrootnav.sample.helper.CutLayout>
</LinearLayout>
Change your CutLayout to have the same path on top like so:
public class CutLayout extends FrameLayout {
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
private Xfermode pdMode = new PorterDuffXfermode(PorterDuff.Mode.CLEAR);
private Path path = new Path();
public CutLayout(Context context) {
super(context);
}
public CutLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CutLayout(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#TargetApi(Build.VERSION_CODES.LOLLIPOP)
public CutLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
protected void dispatchDraw(Canvas canvas) {
int saveCount = canvas.saveLayer(0, 0, getWidth(), getHeight(), null, Canvas.ALL_SAVE_FLAG);
super.dispatchDraw(canvas);
paint.setXfermode(pdMode);
path.reset();
path.moveTo(0, 0);
path.lineTo(getWidth(), 0);
path.lineTo(0, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, getResources().getDisplayMetrics()));
path.close();
canvas.drawPath(path, paint);
path.reset();
path.moveTo(0, getHeight());
path.lineTo(getWidth(), getHeight());
path.lineTo(getWidth(), getHeight() - TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, getResources().getDisplayMetrics()));
path.close();
canvas.drawPath(path, paint);
canvas.restoreToCount(saveCount);
paint.setXfermode(null);
}
}
Then all you have to do is to create an item decorator for your Recycler view that can accept a negative top margin
public class NegativeTopItemDecorator extends RecyclerView.ItemDecoration{
private final int mTopMargin;
public NegativeTopItemDecorator(int topMargin) {
this.mTopMargin = topMargin;
}
#Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
outRect.top = mTopMargin;
}
}
And add it to your RecyclerView
int topMargin = - (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50, getResources().getDisplayMetrics());
NegativeTopItemDecorator itemDecorator = new NegativeTopItemDecorator(topMargin);
mRecyclerView.addItemDecoration(itemDecorator);
This will give you something like the following output
I'm trying to draw a custom text on an ImageButton. I have overwritten the method onDraw(Canvas) but it didn't work. This is the code:
public class CustomImageButton extends ImageButton {
private static final String TAG = "CustomImageButton";
private String text = "";
private float textSize;
private int textColor;
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
public CustomImageButton(Context context) {
super(context);
initialize(null);
}
public CustomImageButton(Context context, AttributeSet attrs) {
super(context, attrs);
initialize(attrs);
}
public CustomImageButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initialize(attrs);
}
private void initialize(AttributeSet attrs) {
if (attrs != null) {
TypedArray a = getContext().obtainStyledAttributes(attrs, R.styleable.CustomImageButton);
text = a.getString(R.styleable.CustomImageButton_text);
textSize = a.getDimension(R.styleable.CustomImageButton_textSize, 20);
textColor = a.getColor(R.styleable.CustomImageButton_textColor, getResources().getColor(R.color.white));
//setBackgroundColor(getResources().getColor(R.color.transparent));
a.recycle();
invalidate();
}
}
#Override
protected void onDraw(Canvas canvas) {
Typeface font = Typefaces.get(getContext(), "fonts/my-font.ttf");
paint.setColor(Color.WHITE);
paint.setTypeface(font);
paint.setTextSize(100);
paint.setTextAlign(Paint.Align.CENTER);
int xPos = canvas.getWidth() / 2;
int yPos = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2));
canvas.drawText(text, xPos, yPos, paint);
}
}
And XML Layout:
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#OOOOOO"
xmlns:app="http://schemas.android.com/apk/res-auto">
<com.my.app.CustomImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
app:text="Hello!"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"/>
. . .
</RelativeLayout>
I used setWillNotDraw(false) but it seems that does not work. I have verified that my custom view has a few correct dimensions.
I am using a RoundedNetworkImageView.I want to add an border of 1 dp to it.If i create a separated drawable and put it as background to RoundedNetworkImageView then it replaces the roundedness of view.How can i update below code to add border to imageview?
Below is the code I am using-
public class RoundedNetworkImageView extends NetworkImageView {
public CWRoundedNetworkImageView(Context context) {
super(context);
}
public CWRoundedNetworkImageView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CWRoundedNetworkImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, widthMeasureSpec);
}
#Override
public ScaleType getScaleType() {
return ScaleType.CENTER_CROP;
}
#Override
protected void onDraw(Canvas canvas) {
float radius = 12.0f;
Path clipPath = new Path();
RectF rect = new RectF(0, 0, this.getWidth(), this.getHeight());
clipPath.addRoundRect(rect, radius, radius, Path.Direction.CW);
canvas.clipPath(clipPath);
super.onDraw(canvas);
}
}
I am trying to make a simple custom view which is not working. I refereed the custom view class from layout resource file. But its not working. Can anybody tell me where the problem is.
public class WriteOnScreenActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
public class CustomView extends View {
private Paint paint;
public TouchEventView(Context context) {
super(context);
paint = new Paint();
paint.setColor(Color.RED);
paint.setTextSize(25);
paint.setAntiAlias(true);
}
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawText("Hello World", 5, 30, paint);
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.example.touch.CustomView
android:id="#+id/TouchEventView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</RelativeLayout>
Move the definition of your class TouchEventView into a new file.
And here's the fix.
public class TouchEventView extends View {
private Paint paint;
public TouchEventView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
setup(context, attrs, defStyle);
}
public TouchEventView(Context context, AttributeSet attrs) {
super(context, attrs);
setup(context, attrs, 0);
}
public TouchEventView(Context context) {
super(context);
setup(context, null, 0);
}
private void setup(Context context, AttributeSet attrs, int defStyle)
{
paint = new Paint();
paint.setColor(Color.RED);
paint.setTextSize(25);
paint.setAntiAlias(true);
}
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawText("Hello World", 5, 30, paint);
}
}
I have a custom RelativeLayout, where i want to dynamically create Rectangles.
They arent shown in my current code, but i dont know whats the reason.
Custom RelativeLayout:
public class DrawView extends RelativeLayout {
public DrawView(Context context) {
super(context);
setFocusable(true);
this.addView(new Rectangle(this.getContext()));
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
}
Custom Rectangle:
public class Rectangle extends View {
public Rectangle(Context context) {
super(context);
}
public Rectangle(Context context, AttributeSet attrs) {
super(context, attrs);
}
public Rectangle(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint paint = new Paint();
paint.setColor(Color.WHITE);
canvas.drawRect(new Rect(), paint);
}
}
EDIT:
Solution was:
public class Rectangle extends View {
public Rectangle(Context context) {
super(context);
init();
}
public Rectangle(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public Rectangle(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() {
this.setBackgroundResource(R.drawable.rectangle);
}
#Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = 150;
int height = 50;
setMeasuredDimension(width, height);
}
}
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners
android:radius="5sp"/>
<gradient
android:angle="315"
android:startColor="#FFFF6666"
android:endColor="#FFFF1111"
android:type="linear"
/>
</shape>
I think you are missing to set your Shape's LayoutParams. Try tho create a Rectangle object, set its width + height and then add it to your RelativeLayout :D