Android：如何只为图像的特定部分填充颜色？
我有像这样的图像：
现在，我想将颜色填充到该图像的特定部分。如果我选择蓝色，如果我触摸Cap，那么帽子应该填充蓝色。同样的事情也应该发生在另一部分，如鼻子，嘴巴，眼睛等
那么，如何使用android？
任何budy可以帮助我吗。
更新
我已尝试在我的应用中实施FloodFill算法。 See Here
但在这之后我得到了例外：
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): java.lang.IllegalStateException
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.graphics.Bitmap.setPixel(Bitmap.java:847)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at com.project.fingerpaint.FinderPaintDemo.FloodFill(FinderPaintDemo.java:284)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at com.project.fingerpaint.FinderPaintDemo.access$3(FinderPaintDemo.java:272)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at com.project.fingerpaint.FinderPaintDemo$MyView.onTouchEvent(FinderPaintDemo.java:187)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.view.View.dispatchTouchEvent(View.java:3766)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:863)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1671)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1107)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.app.Activity.dispatchTouchEvent(Activity.java:2086)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1655)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.view.ViewRoot.handleMessage(ViewRoot.java:1785)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.os.Handler.dispatchMessage(Handler.java:99)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.os.Looper.loop(Looper.java:123)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at android.app.ActivityThread.main(ActivityThread.java:4627)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at java.lang.reflect.Method.invokeNative(Native Method)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at java.lang.reflect.Method.invoke(Method.java:521)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
03-09 17:45:16.260: ERROR/AndroidRuntime(2558): at dalvik.system.NativeStart.main(Native Method)
现在，我的代码有什么问题？
请在这种情况下帮助我。
感谢。
3 个答案:
答案 0 :(得分：6)
这是在下面填充颜色的完整代码：
填写图片：http://i.stack.imgur.com/7rita.jpg
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_horizontal"
android:orientation="vertical" >
<RelativeLayout
android:id="@+id/relative_layout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_weight="1" >
<ImageView
android:id="@+id/coringImage"
android:layout_width="300dp"
android:layout_height="300dp" />
</RelativeLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/btn_red"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="red" />
<Button
android:id="@+id/btn_yellow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="yellow" />
<Button
android:id="@+id/btn_blue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="blue" />
</LinearLayout>
</LinearLayout>
活动类
public class FillColorActivity extends Activity implements OnTouchListener {
private RelativeLayout drawingLayout;
private MyView myView;
Button red, blue, yellow;
Paint paint;
/** Called when the activity is first created. */
/*
*
* private ImageView imageView; private Canvas cv; private Bitmap mask,
* original, colored; private int r,g,b; private int sG, sR, sB;
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myView = new MyView(this);
drawingLayout = (RelativeLayout) findViewById(R.id.relative_layout);
drawingLayout.addView(myView);
red = (Button) findViewById(R.id.btn_red);
blue = (Button) findViewById(R.id.btn_blue);
yellow = (Button) findViewById(R.id.btn_yellow);
red.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
paint.setColor(Color.RED);
}
});
yellow.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
paint.setColor(Color.YELLOW);
}
});
blue.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
paint.setColor(Color.BLUE);
}
});
}
public class MyView extends View {
private Path path;
Bitmap mBitmap;
ProgressDialog pd;
final Point p1 = new Point();
Canvas canvas;
// Bitmap mutableBitmap ;
public MyView(Context context) {
super(context);
paint = new Paint();
paint.setAntiAlias(true);
pd = new ProgressDialog(context);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(5f);
mBitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.cartoon).copy(Bitmap.Config.ARGB_8888, true);
this.path = new Path();
}
@Override
protected void onDraw(Canvas canvas) {
this.canvas = canvas;
paint.setColor(Color.GREEN);
canvas.drawBitmap(mBitmap, 0, 0, paint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
p1.x = (int) x;
p1.y = (int) y;
final int sourceColor = mBitmap.getPixel((int) x, (int) y);
final int targetColor = paint.getColor();
new TheTask(mBitmap, p1, sourceColor, targetColor).execute();
invalidate();
}
return true;
}
public void clear() {
path.reset();
invalidate();
}
public int getCurrentPaintColor() {
return paint.getColor();
}
class TheTask extends AsyncTask<Void, Integer, Void> {
Bitmap bmp;
Point pt;
int replacementColor, targetColor;
public TheTask(Bitmap bm, Point p, int sc, int tc) {
this.bmp = bm;
this.pt = p;
this.replacementColor = tc;
this.targetColor = sc;
pd.setMessage("Filling....");
pd.show();
}
@Override
protected void onPreExecute() {
pd.show();
}
@Override
protected void onProgressUpdate(Integer... values) {
}
@Override
protected Void doInBackground(Void... params) {
FloodFill f = new FloodFill();
f.floodFill(bmp, pt, targetColor, replacementColor);
return null;
}
@Override
protected void onPostExecute(Void result) {
pd.dismiss();
invalidate();
}
}
}
// flood fill
public class FloodFill {
public void floodFill(Bitmap image, Point node, int targetColor,
int replacementColor) {
int width = image.getWidth();
int height = image.getHeight();
int target = targetColor;
int replacement = replacementColor;
if (target != replacement) {
Queue<Point> queue = new LinkedList<Point>();
do {
int x = node.x;
int y = node.y;
while (x > 0 && image.getPixel(x - 1, y) == target) {
x--;
}
boolean spanUp = false;
boolean spanDown = false;
while (x < width && image.getPixel(x, y) == target) {
image.setPixel(x, y, replacement);
if (!spanUp && y > 0
&& image.getPixel(x, y - 1) == target) {
queue.add(new Point(x, y - 1));
spanUp = true;
} else if (spanUp && y > 0
&& image.getPixel(x, y - 1) != target) {
spanUp = false;
}
if (!spanDown && y < height - 1
&& image.getPixel(x, y + 1) == target) {
queue.add(new Point(x, y + 1));
spanDown = true;
} else if (spanDown && y < height - 1
&& image.getPixel(x, y + 1) != target) {
spanDown = false;
}
x++;
}
} while ((node = queue.poll()) != null);
}
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return false;
}
}
答案 1 :(得分：3)
使用FloodFill。
FloodFill f= new FloodFill();
f.floodFill(bmp,pt,targetColor,replacementColor);
public class FloodFill {
public void floodFill(Bitmap image, Point node, int targetColor,
int replacementColor) {
int width = image.getWidth();
int height = image.getHeight();
int target = targetColor;
int replacement = replacementColor;
if (target != replacement) {
Queue<Point> queue = new LinkedList<Point>();
do {
int x = node.x;
int y = node.y;
while (x > 0 && image.getPixel(x - 1, y) == target) {
x--;
}
boolean spanUp = false;
boolean spanDown = false;
while (x < width && image.getPixel(x, y) == target) {
image.setPixel(x, y, replacement);
if (!spanUp && y > 0 && image.getPixel(x, y - 1) == target) {
queue.add(new Point(x, y - 1));
spanUp = true;
} else if (spanUp && y > 0
&& image.getPixel(x, y - 1) != target) {
spanUp = false;
}
if (!spanDown && y < height - 1
&& image.getPixel(x, y + 1) == target) {
queue.add(new Point(x, y + 1));
spanDown = true;
} else if (spanDown && y < height - 1
&& image.getPixel(x, y + 1) != target) {
spanDown = false;
}
x++;
}
} while ((node = queue.poll()) != null);
}
}
}
答案 2 :(得分：1)
我怀疑初始位图是以只读模式创建的。这可能是导致setPixel（）异常的原因。您可以通过BitmapFactory选项更改它：
opt = new BitmapFactory.Options();
// force RGBA pixel format even for 8-bit grey scale image files.
opt.inPreferredConfig = Bitmap.Config.ARGB_8888;
// want to modify the bitmap content.
opt.inMutable = true;
Bitmap bitmap=BitmapFactory.decodeFile("clown.png", opt);
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