The first stage of the training project: based on the storage card music player V02
1. This section adds functions based on the storage card music player V0.1:
1. Add a progress bar to dynamically display the progress of music playback.
2. Add a label to display the current position of the music playing (format-mm:ss).
3. Add a label to display the playing time of the music (format-mm:ss).
2. The knowledge points involved at this stage are:
1. Linear Layout
2. Labels (TextView)
3. Buttons
4. Media Players (MediaPlayer)
5. Reading files in the specified directory of the memory card
6 , Control background selector
7. Progress bar (ProgressBar)
8. Thread (Thread)
9. Message processor (Handler)
3. Implementation steps: (partial screenshots)
