android开发打印票据或文档的方法：android打印文档的类

最近在做个一个基于android平台的工厂ERP项目，需要用到android平板连接打印机打印文档的功能。经过在网上一顿狂搜之后，发现目前好像打印机对android的直接没有任何标准，再不就是自家封的API，再不就是直接调用ESC/POS命令，通过调用打印函数来打印。如果直接使用ESC/POS命令，这个到是通用，但是调用打印机指令进行走纸、扫点这个开发成本有点高。如果调用打印机的API，那么如果有N个项目，客户采购N种不同的打印机，我们就要实现N套打印程序。针对以上的情况，是否可以通过图片或者PDF等通用格式进行打印呢？好吧，我们使用android自带的xml编辑器来生成layout，在程序里通过layout给控件赋值，之后把layout生成view，转化成图片。再通过打印机提供的厂商提供的图片打印API来实现单据的打印。这个程序目前可以把xml转化为图片并保存到本地，由于没有真机，无法进行打印测试。但按照市场调研，目前市面的热敏打印机都支持图片打印。下面附上源码：打印工具类 [java] view plain copy

public class PrintUtil {
private static final String TAG = "PrintUtil";
public String SCREEN_SHOTS_LOCATION = Environment
.getExternalStorageDirectory().getPath();
/**
* 对当前view进行截屏，并保存到SCREEN_SHOTS_LOCATION指定的目录下
* @param view
* @param name
* @return
* @throws Exception
*/
public void takeScreenShot(View view, String name,TakeScreenShotCallBack callback) throws Exception{
takeScreenShot(view,name,SCREEN_SHOTS_LOCATION,callback);
}
TakeScreenShotCallBack mCallback = new TakeScreenShotCallBack(){
@Override
public void excute(File file) {
// TODO Auto-generated method stub
}
};
/**
* 把传入的view保存为图片
* @param parent 事件触发视图，可以是button等
* @param view 保存为图片的视图
* @param isShow 是否显示展示视图
* @return
*/
public void shotViewAsImage(View parent,View view, boolean isShow){
PopupWindow popupWindow = getPopuptWindow(view);
if(isShow)
popupWindow.showAtLocation(parent, Gravity.CENTER, 0, 0);
File newFile = null;
try {
takeScreenShot(popupWindow.getContentView(),null,mCallback);
} catch (Exception e) {
Log.e(TAG, e.getMessage());
}
}
/**
* 创建popupWindow
* @param popupWindow_view
* @return
*/
protected PopupWindow getPopuptWindow(View popupWindow_view) {
PopupWindow popupWindow = null;
popupWindow = new PopupWindow(popupWindow_view, LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT, true);// 创建PopupWindow实例
popupWindow.setBackgroundDrawable(new BitmapDrawable());
popupWindow.setFocusable(true);
popupWindow.setOutsideTouchable(false);
return popupWindow;
}
public interface TakeScreenShotCallBack{
public void excute(File file);
}
/**
* 对当前view进行截屏，并保存到path指定的目录下
* @param view
* @param name
* @param path
* @return
* @throws Exception
*/
public void takeScreenShot(final View view, final String name,final String path,final TakeScreenShotCallBack callback) throws Exception {
final Bitmap bitmap = convertViewToBitmap(view);
Runnable runnable = new Runnable() {
@Override
public void run() {
Canvas canvas = new Canvas(bitmap);
int w = bitmap.getWidth();
int h = bitmap.getHeight();
Paint paint = new Paint();
paint.setColor(Color.YELLOW);
String n = null;
if(null == name || "".equals(name)){
SimpleDateFormat simple = new SimpleDateFormat("yyyyMMddhhmmss");
n = simple.format(new Date());
}else{
n = name;
}
canvas.drawText("", w - w / 2, h - h / 10, paint);
canvas.save();
canvas.restore();
FileOutputStream fos = null;
File file = null;
try {
File sddir = new File(path);
if (!sddir.exists()) {
sddir.mkdirs();
}
//生成以时间为名称的文件
file = new File(path + File.separator
+ n + ".png");
fos = new FileOutputStream(file);
if (fos != null) {
bitmap.compress(Bitmap.CompressFormat.PNG, 90, fos);
fos.close();
}
} catch (Exception e) {
Log.e(TAG, e.getMessage(),e);
}
callback.excute(file);
}
};
Thread thread = new Thread(runnable);
thread.start();
}
/**
* 转换view为bitmap
* @param view
* @return
*/
public Bitmap convertViewToBitmap(View view){
view.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED), MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
view.buildDrawingCache();
Bitmap bitmap = view.getDrawingCache();
return bitmap;
}
private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
}
调用函数
public void print(String data) {
View view = LayoutInflater.from(this).inflate(R.layout.print_test,
null, false);
//这几句可以注释掉，是另一个条形码生成的方法
/* ImageView bar_img = (ImageView) view
.findViewById(R.id.print_img_barcode);
try {
bar_img.setImageBitmap(testCODE39(data));
} catch (Exception e) {
} */
PrintUtil printer = new PrintUtil();
printer.shotViewAsImage(btn_print, view, true);
}

更多相关文章

随机推荐