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The length of Android is: DP (or dip device independent pixels) an abstract unit based on screen density. On a monitor that is 160 dots per inch. 1dp=1px.Different devices have different display effects. This is related to device hardware. Use unit DP;SP (scaled Pixels) when layout is used primarily for font display, a pixel independent of the scale, similar to DP. However, it is possible to scale based on the user's font size preference. PX: Indicate
When I used Android Samsung S3 for development today, I found that the database is always locked and other models are not locked. I found that the folder where the database is located, A file with the same name as the db file contains an inexplicable file ending with-journal. It is suspected that this is the cause, so you can determine whether the file exists in the program, if it exists, it is deleted. As
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