It could be found anywhere, just a note for me.
1. For view AndroidManifest.xml only.
apktool d test.apk test // decompile the test.apk to folder "test"
2. For dive into source code: dex2jar.sh + jd-gui
1). cp test.apk test.zip
2). unzip test.zip (here we got classes.dex)
3). download dex2jar
4). dex2jar.sh classes.dex (here we got classes_dex2jar.jar)
5). jd-gui classes_dex2jar.jar