将Android SurfaceView保存为位图，部分元素丢失
将Android SurfaceView保存为位图，部分元素丢失
提问于 2012-05-24 18:14:18
我已经启动并运行了我的SurfaceView，其中一个按钮用于打开相机并拍摄一张用作背景的照片，另一个按钮用于添加位于顶部并可以四处移动的项目。这一切都很好，直到我尝试将SurfaceView保存为位图，而我得到的只是背景而没有顶部的图像。
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if(_mGotImage){
canvas.drawBitmap(_mImage, 0, 0, null);
}else{
canvas.drawColor(Color.BLACK);
}
//if the array is not empty
if(!_mJazzItems.isEmpty()){
//step through each item in the array
for(JazzItem item: _mJazzItems){
//get the bitmap it is using
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), item.getBitmap());
//and draw that bitmap at its X and Y coords
canvas.drawBitmap(bitmap, item.getX(), item.getY(), null);
}
}
}这是用来尝试保存画布的方法。
public void screenGrab(){
Bitmap image = Bitmap.createBitmap(_mPanelWidth, _mPanelHeight, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(image);
this.onDraw(canvas);
String path=Environment.getExternalStorageDirectory() + "/test2.png";
File file = new File(path);
try{
file.createNewFile();
FileOutputStream ostream = new FileOutputStream(file);
image.compress(CompressFormat.PNG, 100, ostream);
ostream.flush();
ostream.close();
}catch (Exception e){
e.printStackTrace();
}
}onDraw运行良好，我在后台拍摄了我的相机，可以在顶部添加所有项目并移动它们。正当我试图截取屏幕截图时，上面的项目都不存在。
谢谢你的帮助！！
-更新--
我已经将屏幕抓取方法修改为：
public void screenGrab(){
Bitmap image = Bitmap.createBitmap(_mPanelWidth, _mPanelHeight, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(image);
canvas.drawBitmap(_mImage, 0, 0, null);
//if the array is not empty
if(!_mJazzItems.isEmpty()){
//step through each item in the array
for(JazzItem item: _mJazzItems){
//get the bitmap it is using
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), item.getBitmap());
//and draw that bitmap at its X and Y coords
canvas.drawBitmap(bitmap, item.getX(), item.getY(), null);
}
}
String path=Environment.getExternalStorageDirectory() + "/test2.png";
File file = new File(path);
try{
file.createNewFile();
FileOutputStream ostream = new FileOutputStream(file);
image.compress(CompressFormat.PNG, 100, ostream);
ostream.flush();
ostream.close();
}catch (Exception e){
e.printStackTrace();
}
}我不明白为什么这不是在顶部绘制其他图像...
Stack Overflow用户
回答已采纳
发布于 2012-05-24 18:33:21
在我的例子中，我使用的是：
public static Bitmap combineImages(Bitmap c, Bitmap overLayImage, Context con) {
Bitmap cs = null;
int width, height = 0;
width = c.getWidth();
height = c.getHeight();
cs = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas comboImage = new Canvas(cs);
comboImage.drawBitmap(c, 0, 0, null);
String left = yourleftPosition;
String top = yourtopPosition;
comboImage.drawBitmap(overLayImage, Float.parseFloat(left), Float.parseFloat(top),null);
/******
*
* Write file to SDCard
*
* ****/
String tmpImg = String.valueOf(System.currentTimeMillis()) + ".png";
OutputStream os = null;
try {
String pathis = Environment.getExternalStorageDirectory()
+ "/DCIM/Camera/" + tmpImg;
os = new FileOutputStream(pathis);
cs.compress(CompressFormat.PNG, 100, os);
}
catch (IOException e) {
Log.e("combineImages", "problem combining images", e);
}
return cs;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/10735448
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