안녕하세요.. 그림판 예제를 조금 바꿔보고 싶어서 고민 하고 있습니다.
제 생각으로는 화면 제일 위쪽에 선 모양(볼펜, 형광펜 등의 모양) 색 선택 등의 버튼을 넣어주고
그 밑에 나머지 화면에다가 그리고 싶어서
MyView로 생성한 뷰를 레이아웃에 추가 하려고 하는데 생각처럼 되질 않고
어플을 실행하면 바로 종료가 되어버립니다.
package com.example.androidtest;
import android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.*;
public class MainActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
View myV = new MyView(this);
LinearLayout linear = (LinearLayout)findViewById(R.id.linear);
linear.addView(myV);
setContentView(linear);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(12);
}
private Paint mPaint;
public class MyView extends View {
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
public MyView(Context c) {
super(c);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawColor(0xFFAAAAAA);
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
}
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
private void touch_start(float x, float y) {
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_move(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
mX = x;
mY = y;
}
}
private void touch_up() {
mPath.lineTo(mX, mY);
// commit the path to our offscreen
mCanvas.drawPath(mPath, mPaint);
// kill this so we don't double draw
mPath.reset();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
break;
}
return true;
}
}
}
이렇게 진행되고 있는데
xml은
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/linear"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/a"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="A" />
<Button
android:id="@+id/B"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B" />
<Button
android:id="@+id/C"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="C" />
<Button
android:id="@+id/D"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="D" />
</LinearLayout>
</LinearLayout>
이렇게 되어있습니다.
어디가 잘못됐다거나 이부분이 좀 이상하다거나 블로그를 참고해보라거나 알려주시면 감사하겠습니다.
