import no.nordicsemi.android.dfu.DfuBaseService; //导入依赖的package包/类
/**
 * Returns the content type based on the content of the ZIP file. The content type may be truncated using {@link #setContentType(int)}.
 * 
 * @return a bit field of {@link DfuBaseService#TYPE_SOFT_DEVICE TYPE_SOFT_DEVICE}, {@link DfuBaseService#TYPE_BOOTLOADER TYPE_BOOTLOADER} and {@link DfuBaseService#TYPE_APPLICATION
 *         TYPE_APPLICATION}
 */
public int getContentType() {
	byte b = 0;
	if (softDeviceSize > 0)
		b |= DfuBaseService.TYPE_SOFT_DEVICE;
	if (bootloaderSize > 0)
		b |= DfuBaseService.TYPE_BOOTLOADER;
	if (applicationSize > 0)
		b |= DfuBaseService.TYPE_APPLICATION;
	return b;
}
 

import no.nordicsemi.android.dfu.DfuBaseService; //导入依赖的package包/类
/**
 * Truncates the current content type. May be used to hide some files, f.e. to send Soft Device and Bootloader without Application or only the Application.
 * 
 * @param type
 *            the new type
 * @return the final type after truncating
 */
public int setContentType(final int type) {
	if (bytesRead > 0)
		throw new UnsupportedOperationException("Content type must not be change after reading content");

	final int t = getContentType() & type;

	if ((t & DfuBaseService.TYPE_SOFT_DEVICE) == 0) {
		softDeviceBytes = null;
		if (softDeviceAndBootloaderBytes != null) {
			softDeviceAndBootloaderBytes = null;
			bootloaderSize = 0;
		}
		softDeviceSize = 0;
	}
	if ((t & DfuBaseService.TYPE_BOOTLOADER) == 0) {
		bootloaderBytes = null;
		if (softDeviceAndBootloaderBytes != null) {
			softDeviceAndBootloaderBytes = null;
			softDeviceSize = 0;
		}
		bootloaderSize = 0;
	}
	if ((t & DfuBaseService.TYPE_APPLICATION) == 0) {
		applicationBytes = null;
		applicationSize = 0;
	}
	return t;
}
 

import no.nordicsemi.android.dfu.DfuBaseService; //导入依赖的package包/类
@Override
public String getMessage() {
	return super.getMessage() + " (error " + (mError & ~DfuBaseService.ERROR_CONNECTION_MASK) + ")";
}