Android: Drawing on Canvas in Scrollview
public class DrawPoints extends myActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.routes);
}
public static class SampleView extends View {
private Paint mPaint = new Paint();
private float[] mPts;
/*here comes declaration of parametars
private void buildPoints() {
/*here comes some coding*/
}
}
public SampleView(Context context, AttributeSet attributeset) {
super(context, attributeSet);
buildPoints();
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = mPaint;
//here also comes code
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scrollView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<HorizontalScrollView
android:id="@+id/scrollView2"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<!-- This code is just to make sure that scroll views work how
I want them to work, image size is 625*351 px
<ImageView
android:id="@+id/image_View1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:src="@drawable/bus_design"
/> -->
<my.package.DrawPoints.SampleView
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</HorizontalScrollView>
</ScrollView>
View v = new SampleView(this);
addContentView(v, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT));
View v = new SampleView(this);
ScrollView.LayoutParams lp = new ScrollView.LayoutParams(1000, 1000);
addContentView(v, lp);
View v = new SampleView(this);
FrameLayout fl = new FrameLayout(this);
fl.findViewById(R.id.FrameLayout1);
fl.addView(v);
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/app_layout" android:orientation="horizontal"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<!-- SCENE -->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scene_layout"
android:drawingCacheQuality="low"
android:orientation="horizontal" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.testiranje.Kristijan.TwoDScrollView
android:id="@+id/scene_scroller" android:drawingCacheQuality="low"
android:scrollbars="horizontal"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scene_container"
android:drawingCacheQuality="low"
android:background="@drawable/map"
android:layout_width="fill_parent" android:layout_height="fill_parent">
<com.testiranje.Kristijan.SampleView
android:layout_height="fill_parent"
android:layout_width="fill_parent">
</com.testiranje.Kristijan.SampleView>
<!-- <ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/scene_background" android:drawingCacheQuality="low"
android:background="@drawable/map"
android:layout_width="fill_parent" android:layout_height="fill_parent" /> -->
</RelativeLayout>
</com.testiranje.Kristijan.TwoDScrollView>
</RelativeLayout>
</RelativeLayout>
public class SampleView extends View {
private Paint mPaint = new Paint();
private float[] mPts;
private static final float SIZE = 1000;
private static final int SEGS = 50;
private static final int X = 0;
private static final int Y = 1;
private void buildPoints() {
final int ptCount = (SEGS + 1) * 2;
mPts = new float[ptCount * 2];
float value = 0;
final float delta = SIZE / SEGS;
for (int i = 0; i <= SEGS; i++) {
mPts[i*4 + X] = SIZE - value;
mPts[i*4 + Y] = 0;
mPts[i*4 + X + 2] = 0;
mPts[i*4 + Y + 2] = value;
value += delta;
}
}
public SampleView(Context context){
super(context);
//initSampleView();
buildPoints();
}
//This constructor is very important because withouth of this
//you can't insert this view in xml
public SampleView(Context context, AttributeSet attrs) {
super(context, attrs);
//initSampleView();
buildPoints();
}
/*private final void initSampleView() {
mPaint = new Paint();
mPaint.setAntiAlias(true);
setPadding(3, 3, 3, 3);
}*/
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
setMeasuredDimension(measureWidth(widthMeasureSpec),
measureHeight(heightMeasureSpec));
}
/**
* Determines the width of this view
* @param measureSpec A measureSpec packed into an int
* @return The width of the view, honoring constraints from measureSpec
*/
private int measureWidth(int measureSpec) {
int result = 0;
//This is because of background image in relativeLayout, which is 1000*1000px
measureSpec = 1001;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.UNSPECIFIED) {
// We were told how big to be
result = specSize;
}
return result;
}
/**
* Determines the height of this view
* @param measureSpec A measureSpec packed into an int
* @return The height of the view, honoring constraints from measureSpec
*/
private int measureHeight(int measureSpec) {
int result = 0;
//This is because of background image in relativeLayout, which is 1000*1000px
measureSpec = 1001;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize = MeasureSpec.getSize(measureSpec);
if (specMode == MeasureSpec.UNSPECIFIED) {
// Here we say how Heigh to be
result = specSize;
}
return result;
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = mPaint;
canvas.translate(10, 10);
paint.setColor(Color.RED);
paint.setStrokeWidth(0);
canvas.drawLines(mPts, paint);
paint.setColor(Color.BLUE);
paint.setStrokeWidth(3);
canvas.drawPoints(mPts, paint);
}
}