Note that if you want you can use your custom view directly in your
XML file, without having to manually add it to the layout at runtime.
To do that:
- declare your view as a static class or in it's separate java file,
let's say mypackage.DrawPoints.Mems
- write something like this in your XML:
<LinearLayout ...attributes...>
< mypackage.DrawPoints.Mems android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
Note that in the XML layout editor you can use Control-Space to
trigger auto-completion on the attributes and values. It doesn't know
your custom class name though.
By the way, how do you get:
package <>.DrawPoints;
<> is not a valid package name in java. Is that some kind of unicode chars?
R/
On Tue, Apr 14, 2009 at 6:53 PM, gandor <gand...@gmail.com> wrote:
>
> Thanks. Yes now it works. Had to use event.getAction and draw
> method.
>
> package <>.DrawPoints;
>
> import android.app.Activity;
> import android.content.Context;
> import android.graphics.Canvas;
> import android.graphics.Color;
> import android.graphics.Paint;
> import android.os.Bundle;
> import android.util.Log;
> import android.view.MotionEvent;
> import android.view.View;
> import android.view.View.OnTouchListener;
> import android.widget.LinearLayout;
> import android.widget.TextView;
>
> public class DrawPoints extends Activity implements OnTouchListener{
> static int i = 0;
> float x = 200;
> float y = 200;
> float x1 = 0;
> float y1 = 0;
>
> /** Called when the activity is first created. */
> �...@override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.main);
> //View topLayout = this.findViewById(R.id.layout_id);
> LinearLayout layMain = (LinearLayout)this.findViewById
> (R.id.layout_id);
> // register for events for the view, previously
> //topLayout.setOnTouchListener((OnTouchListener) this);
> layMain.setOnTouchListener((OnTouchListener) this);
> layMain.addView(new Mens(this));
>
> }
>
> // the following callback is called when touch event on screen
> happens
> �...@override
> public boolean onTouch(View v, MotionEvent event) {
> String tag = null;
>
> switch (event.getAction())
> {
> case MotionEvent.ACTION_DOWN:
> {
> x = event.getX();
> y = event.getY();
> }
> }
> return false;
> }
>
> public class Mens extends View {
>
> public Mens(Context context)
> {
> super(context);
>
> }
>
> protected void onDraw(Canvas canvas)
> {
> Paint p = new Paint();
> p.setColor(Color.RED);
>
> canvas.drawLine(15, 15, x , y, p);
> invalidate();
> }
>
> }
>
> }
>
> On Apr 13, 10:33 pm, Raphael <r...@android.com> wrote:
>> A couple suggestions:
>>
>> - don't make your x/y fields static.
>> - in onTouch, test that MotionEvent.getAction() is ACTION_DOWN.
>> - to draw you should create a custom View class and override the
>> onDraw method. See ApiDemos or the LunarLander samples for a start.
>>
>> R/
>>
>> On Mon, Apr 13, 2009 at 5:14 PM, gandor <gand...@gmail.com> wrote:
>>
>> > Hi,
>>
>> > Want to draw a line when I touch screen at two points.
>> > I can see OnTouch been invoked but after than everything breaks looks,
>> > the application crashes
>>
>> > I am using drawLine in Canvas.
>> > Please let me know what I am doing wrong
>>
>> > package <>.DrawPoints;
>>
>> > import android.app.Activity;
>> > import android.content.Context;
>> > import android.graphics.Canvas;
>> > import android.graphics.Color;
>> > import android.graphics.Paint;
>> > import android.os.Bundle;
>> > import android.util.Log;
>> > import android.view.MotionEvent;
>> > import android.view.View;
>> > import android.view.View.OnTouchListener;
>> > import android.widget.TextView;
>>
>> > public class DrawPoints extends Activity implements OnTouchListener{
>> > static int i = 0;
>> > static float static_x = 0;
>> > static float static_y = 0;
>> > static float static_x1 = 0;
>> > static float static_y1 = 0;
>>
>> > /** Called when the activity is first created. */
>> > �...@override
>> > public void onCreate(Bundle savedInstanceState) {
>> > super.onCreate(savedInstanceState);
>> > setContentView(R.layout.main);
>> > View topLayout = this.findViewById(R.id.layout_id);
>> > // register for events for the view, previously
>> > topLayout.setOnTouchListener((OnTouchListener) this);
>>
>> > }
>> > // the following callback is called when touch event on screen
>> > happens
>> > �...@override
>> > public boolean onTouch(View v, MotionEvent event) {
>> > String tag = null;
>>
>> > if(i == 0) {
>> > static_x = event.getX();
>> > static_y = event.getY();
>> > i = 1;
>> > } else
>> > {
>> > static_x1 = event.getX();
>> > static_y1 = event.getY();
>>
>> > }
>>
>> > if(i == 1) {
>> > Paint p = new Paint();
>> > p.setColor(Color.WHITE);
>> > p.setStyle(Paint.Style.STROKE);
>> > Canvas canvas = new Canvas();
>> > canvas.drawColor(Color.BLUE);
>>
>> > canvas.drawLine(static_x, static_y, static_x1, static_y1,
>> > p);
>> > i = 0;
>> > }
>>
>> > return false;
>> > }
>>
>> > }
>>
>> > <?xml version="1.0" encoding="utf-8"?>
>> > <LinearLayout xmlns:android="http://schemas.android.com/apk/res/
>> > android"
>> > android:id="@+id/layout_id"
>> > android:orientation="vertical"
>> > android:layout_width="fill_parent"
>> > android:layout_height="fill_parent"
>> > >
>> > <TextView
>> > android:layout_width="fill_parent"
>> > android:layout_height="wrap_content"
>> > android:text="@string/hello"
>> > />
>> > </LinearLayout>
> >
>
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