android-demos：添加代码
#	modified:   MyZxingProject/.classpath
#	modified:   ZXingDemo/.classpath
#	new file:   android-demos/src/com/example/utils/ArrayUtils.java
#	new file:   android-demos/src/com/example/utils/BitmapUtils.java
#	modified:   android-demos/src/com/example/utils/BytesInputStream.java
#	modified:   android-demos/src/com/example/utils/BytesOutputStream.java
#	modified:   android-demos/src/com/example/utils/EndianUtils.java
#	new file:   android-demos/src/com/example/utils/LogWriter.java
#	modified:   android-demos/src/com/example/utils/Metrics.java
#	new file:   android-demos/src/com/example/utils/RandomReader.java
#	new file:   android-demos/src/com/example/utils/TimeStat.java
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