Android 将图像从SD卡加载到DrawingView
我是android开发的新手。我需要一些从SD卡加载图像到drawingView的帮助。我在这里试图实现的是在加载图像后，我要修改图像并保存。 因此，我的主要任务是将图像加载到DrawingView。 谢谢你在这方面的帮助Android 将图像从SD卡加载到DrawingView,android,android-layout,android-activity,Android,Android Layout,Android Activity,我是android开发的新手。我需要一些从SD卡加载图像到drawingView的帮助。我在这里试图实现的是在加载图像后，我要修改图像并保存。 因此，我的主要任务是将图像加载到DrawingView。 谢谢你在这方面的帮助 谢谢。不确定什么是DrawingView，还是说ImageView File imageFile = new File("/sdcard/my_photo_1.jpg"); Bitmap bitmap = BitmapFactory.decodeFile(imageFile.
谢谢。不确定什么是
DrawingViewImageViewFile imageFile = new File("/sdcard/my_photo_1.jpg");
Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
imageView.setImageBitmap(bitmap);
不确定什么是
DrawingViewImageViewFile imageFile = new File("/sdcard/my_photo_1.jpg");
Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
imageView.setImageBitmap(bitmap);
您可以使用画布绘制图像，下面是代码：
public class Keypaint extends View {
Paint p;
Bitmap bitmap = null;
public Keypaint(Context context) {
super(context);
File imageFile = new File("/sdcard/my_photo_1.jpg");
bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
p=new Paint();
p.setColor(Color.RED);
canvas.drawBitmap(bitmap, 0, 0, p);
}
}
您可以使用画布绘制图像，下面是代码：
public class Keypaint extends View {
Paint p;
Bitmap bitmap = null;
public Keypaint(Context context) {
super(context);
File imageFile = new File("/sdcard/my_photo_1.jpg");
bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath());
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
p=new Paint();
p.setColor(Color.RED);
canvas.drawBitmap(bitmap, 0, 0, p);
}
}
请用这样的东西……这对我有用
YourDrawingView jpgView = (YourDrawingView)findViewById(R.id.imageView);
Bitmap bitmap = BitmapFactory.decodeFile("/sdcard/sample-1.jpg");
jpgView.setImageBitmap(bitmap);
setContentView(R.layout.main);
public class DrawingView extends ImageView {
private boolean erase = false;
//drawing path
private Path drawPath;
//drawing and canvas paint
private Paint drawPaint, canvasPaint;
//initial color
private int paintColor = 0xFF660000;
//canvas
private Canvas drawCanvas;
//canvas bitmap
private Bitmap canvasBitmap;
private float brushSize, lastBrushSize;
public DrawingView(Context context, AttributeSet attrs) {
super(context, attrs);
setUpDrawing();
}
public DrawingView(Context context) {
super(context);
}
private void setUpDrawing() {
drawPath = new Path();
drawPaint = new Paint();
drawPaint.setColor(paintColor);
drawPaint.setAntiAlias(true);
drawPaint.setStrokeWidth(20);
drawPaint.setStyle(Paint.Style.STROKE);
drawPaint.setStrokeJoin(Paint.Join.ROUND);
drawPaint.setStrokeCap(Paint.Cap.ROUND);
canvasPaint = new Paint(Paint.DITHER_FLAG);
brushSize = getResources().getInteger(R.integer.medium_size);
lastBrushSize = brushSize;
drawPaint.setStrokeWidth(brushSize);
}
public void setErase(boolean isErase) {
//set erase true or false
erase = isErase;
if (erase) drawPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
else drawPaint.setXfermode(null);
}
public void setBrushSize(float newSize) {
//update size
float pixelAmount = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
newSize, getResources().getDisplayMetrics());
brushSize = pixelAmount;
drawPaint.setStrokeWidth(brushSize);
}
public void setLastBrushSize(float lastSize) {
lastBrushSize = lastSize;
}
public float getLastBrushSize() {
return lastBrushSize;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
canvasBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
drawCanvas = new Canvas(canvasBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(canvasBitmap, 0, 0, canvasPaint);
canvas.drawPath(drawPath, drawPaint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float touchX = event.getX();
float touchY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
drawPath.moveTo(touchX, touchY);
break;
case MotionEvent.ACTION_MOVE:
drawPath.lineTo(touchX, touchY);
break;
case MotionEvent.ACTION_UP:
drawCanvas.drawPath(drawPath, drawPaint);
drawPath.reset();
break;
default:
break;
}
invalidate();
return true;
}
public void setColor(String color) {
invalidate();
paintColor = Color.parseColor(color);
drawPaint.setColor(paintColor);
}
public void startNew() {
drawCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
invalidate();
}
}
请用这样的东西……这对我有用
YourDrawingView jpgView = (YourDrawingView)findViewById(R.id.imageView);
Bitmap bitmap = BitmapFactory.decodeFile("/sdcard/sample-1.jpg");
jpgView.setImageBitmap(bitmap);
setContentView(R.layout.main);
public class DrawingView extends ImageView {
private boolean erase = false;
//drawing path
private Path drawPath;
//drawing and canvas paint
private Paint drawPaint, canvasPaint;
//initial color
private int paintColor = 0xFF660000;
//canvas
private Canvas drawCanvas;
//canvas bitmap
private Bitmap canvasBitmap;
private float brushSize, lastBrushSize;
public DrawingView(Context context, AttributeSet attrs) {
super(context, attrs);
setUpDrawing();
}
public DrawingView(Context context) {
super(context);
}
private void setUpDrawing() {
drawPath = new Path();
drawPaint = new Paint();
drawPaint.setColor(paintColor);
drawPaint.setAntiAlias(true);
drawPaint.setStrokeWidth(20);
drawPaint.setStyle(Paint.Style.STROKE);
drawPaint.setStrokeJoin(Paint.Join.ROUND);
drawPaint.setStrokeCap(Paint.Cap.ROUND);
canvasPaint = new Paint(Paint.DITHER_FLAG);
brushSize = getResources().getInteger(R.integer.medium_size);
lastBrushSize = brushSize;
drawPaint.setStrokeWidth(brushSize);
}
public void setErase(boolean isErase) {
//set erase true or false
erase = isErase;
if (erase) drawPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
else drawPaint.setXfermode(null);
}
public void setBrushSize(float newSize) {
//update size
float pixelAmount = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
newSize, getResources().getDisplayMetrics());
brushSize = pixelAmount;
drawPaint.setStrokeWidth(brushSize);
}
public void setLastBrushSize(float lastSize) {
lastBrushSize = lastSize;
}
public float getLastBrushSize() {
return lastBrushSize;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
canvasBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
drawCanvas = new Canvas(canvasBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(canvasBitmap, 0, 0, canvasPaint);
canvas.drawPath(drawPath, drawPaint);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float touchX = event.getX();
float touchY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
drawPath.moveTo(touchX, touchY);
break;
case MotionEvent.ACTION_MOVE:
drawPath.lineTo(touchX, touchY);
break;
case MotionEvent.ACTION_UP:
drawCanvas.drawPath(drawPath, drawPaint);
drawPath.reset();
break;
default:
break;
}
invalidate();
return true;
}
public void setColor(String color) {
invalidate();
paintColor = Color.parseColor(color);
drawPaint.setColor(paintColor);
}
public void startNew() {
drawCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
invalidate();
}
}
您好Vivek感谢您的回复，无法访问setImageBitmap（位图）方法。我如何解决它？对不起，我忘了提到我的自定义视图扩展imageview没有问题，伙计，我可以看看你是如何从imageview扩展它的吗？谢谢。您好Vivek谢谢您的回复，无法访问setImageBitmap（位图）方法。我如何解决它？对不起，我忘了提到我的自定义视图扩展imageview没有问题，伙计，我可以看看你是如何从imageview扩展它的吗？非常感谢。