其实我在android中使用画布进行图像编辑......但我不知道......
有我的代码：
public class Crop_Image_Activity1 extends Activity implements OnClickListener
{
static int count=0,i=0,j=0;
ImageView img1;
Button bt1,bt2;
Path path=new Path();
Paint mPaint;
float x_current,y_current;
float x0,y0;
float x1,y1;
float pointx[]=new float[20];
float pointy[]=new float[20];
String num;
MyView view1;
ViewGroup.LayoutParams params;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_crop__image__activity1);
img1=(ImageView)findViewById(R.id.imageView1);
bt1=(Button)findViewById(R.id.button1);
bt2=(Button)findViewById(R.id.button2);
//img1.setImageResource(R.drawable.pic1);
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(0xFFFF0000);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setStrokeWidth(1);
view1=new MyView(this);
params =new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
addContentView(view1, params);
// bt1.setOnClickListener(this);
// bt2.setOnClickListener(this);
}
public class MyView extends View implements android.view.GestureDetector.OnGestureListener{
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
private GestureDetector gestureScanner;
public MyView(Context c)
{
super(c);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
gestureScanner=new GestureDetector(this);
}
@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);
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas)
{
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
}
@Override
public boolean onTouchEvent(MotionEvent event)
{
return gestureScanner.onTouchEvent(event);
}
public boolean onDown(MotionEvent arg0)
{
x1=arg0.getX();
y1=arg0.getY();
if(count==-1)
{
mPath.reset();
mPath.moveTo(pointx[j],pointy[j]);
}
else if(count==0)//// storing initial points
{
mPath.moveTo(x1, y1);
mCanvas.drawCircle(x1,y1,10, mPaint);
x0=x1;
y0=y1;
pointx[i]=x1; /// storing all points in array
pointy[i]=y1;
}
else if(count>0)
{
mPath.moveTo(x_current,y_current);
mCanvas.drawCircle(x_current,y_current,10, mPaint);
}
count++;
invalidate();
return true;
}
@Override
public boolean onFling(MotionEvent arg0, MotionEvent arg1, float arg2,float arg3)
{
x_current=arg1.getX();
y_current=arg1.getY();
i++;
pointx[i]=x_current;
pointy[i]=y_current;
mPath.lineTo(x_current,y_current);
mCanvas.drawPath(mPath, mPaint);
invalidate();
return true;
}
public boolean onSingleTapUp(MotionEvent e)
{
mPath.moveTo(x_current,y_current);
mPath.lineTo(x0,y0);
mCanvas.drawPath(mPath, mPaint);
invalidate();
return true;
}
public boolean onDoubleTapUp(MotionEvent e)
{
return false;
}
public void onLongPress(MotionEvent e)
{
for(j=0;j<=i;j++)
{
if((e.getX()>pointx[j]-20 && e.getX()<pointx[j]+20) && (e.getY()>pointy[j]-20 && e.getY()<pointy[j]+20))
{
mPaint.setColor(Color.BLUE);
mCanvas.drawCircle(pointx[j],pointy[j],20, mPaint);
count=-1;
invalidate();
mPaint.setColor(0xFFFF0000);
break;
}
}
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2,float distanceX, float distanceY)
{
return false;
}
@Override
public void onShowPress(MotionEvent e)
{
}
}
public void onClick(View view)
{
switch(view.getId())
{
case R.id.button1:
break;
case R.id.button2:
// Intent intent1=new Intent();
// startActivity(intent1);
break;
}
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_crop__image__activity1, menu);
return true;
}
}
答案 0 :(得分：0)
如果您希望自定义视图和xml布局中的组件都显示在屏幕上，请创建RelativeLayout并将其设置为活动视图。然后将您的cutom视图添加到该布局，并使用相对布局作为父级来扩展.xml文件中的视图。
像这样：
RelativeLayout relativeLayout = new RelativeLayout(this);
setContentView(relativeLayout);
layout.addView(myView);
LayoutInflater inflater = LayoutInflater.from(this);
inflater.inflate(R.layout.activity_crop__image__activity1, relativeLayout);
关于最后一个问题，请尝试使用onTouch方法
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
tx = event.getX(); // get coordinates when you touch the screen
ty = event.getY();
break;
case MotionEvent.ACTION_MOVE:
newX = event.getX(); // get coordinates when you move the finger
newY = event.getY();
for(int i = 0; i < pointx.length; i++){ // iterate over points array
if(((tx - pointx[i])*(tx - pointx[i]) + (ty - pointy[i])*(ty - pointy[i])) < 20){
// if you touched within 20 pixels of the polygon's vertex
// ...
// create Path anew replacing that vertex with coordinates newX and newY
}
}
break;
}
return true;
}