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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