my code:-
main.xml
<?xml version="1.0" encoding="utf-8"?>
<com.MyPack.canvasexample.Myview
android:id="@+id/view1"
android:layout_width="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android";
android:layout_height="fill_parent"
android:clickable="true"
/>
Myview.java
package com.MyPack.canvasexample;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
public class Myview extends View {
public Myview(Context context) {
super(context);
// TODO Auto-generated constructor stub
this.invalidate();
}
public Myview(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
this.invalidate();
}
public Myview(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
this.invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
// TODO Auto-generated method stub
super.onDraw(canvas);
canvas.drawLine(100, 100, 200, 200, new Paint());
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
}
canvasexample.java
package com.MyPack.canvasexample;
import android.app.Activity;
import android.os.Bundle;
public class canvasexample extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View v= findViewById(R.id.view1);
if(v==null)
Log.w("isnull", "null");
else
Log.w("isnull", "not null");
}
}
this is my code....
the log displays "not null" for "isnull" tag that is view to b not
null...
do we need to write anything in manifest file.
in graphical view of main.xml i can see a line drawn on the canvas but
when i execute my program it shows nothing on canvas...
ya we knw that we can draw a line without creating an extra view but
we r trying to do it by creating a custom view...
On Mar 18, 9:55 pm, Aisthesis <marsh...@marshallfarrier.com> wrote:
> did you use the fully qualified name when you put it in main.xml?
> e.g.: com.google.myapp.MyView
> if that doesn't do it, it's hard to debug without any code--also there
> are ways to draw a line without creating an extra custom view
>
> On Mar 17, 8:05 am, "Vishwesh R." <vish...@gmail.com> wrote:
>
> > hi,
> > im a beginner
> > i have created a Myview wich extends View class. i have drawn a
> > line on this view (that is Myview) in its onDraw() method.
> > i included my view in its main.xml
>
> > it shows no error but when i run this application, it loads the canvas
> > but im unable to see the line wich i have drawn in Myview
> > the coordinate of the line do lie on canvas but it not visible after
> > the application is run..
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