Android Tricks

Mount a filesystem read-write

Very often when you want to write files to a particular partition on ADP1, you will get a "Permission Denied" if the partition is mounted read-only.
To get around this, you need to mount the partition read-write. Typically this is done with /system partition

$ adb shell
$ su
$ mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system (or mount -o rw,remount,rw /system)

(Replace /dev/block/mtdblock3 & /system with appropriate device path and mount point, as obtained from cat /proc/mounts)

Moving Android cache to SD Card

Some Android devices, which have little internal memory or when download data and application data fills the cache area, will issue “insufficient space” warning.  A quick workaround would be to move device cache and/or application caches to SC card.

It is assumed that the device is already rooted and a way to run commands on the device is available. i.e “Terminal Emulator” app, Android ADB.

Basically, the idea is to create a cache folder on SD card, remove the cache folder on internal memory and then link the internal folder to the folder on SD card so SD card space is used.

To move the cache folder

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umount /cache mount -o rw,remount -t rootfs rootfs / rmdir /cache mkdir /sdcard/cache ln -s /sdcard/cache /cache

Browser Cache

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cd /data/data/com.android.browser/cache rm -R webviewCache mkdir /sdcard/cache/webviewCache ln -s /sdcard/cache/webviewCache webviewCache

Google Maps

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cd /data/data/com.google.android.apps.maps rm -R files mkdir /sdcard/cache/files/maps ln -s /sdcard/cache/files/maps files

Google StreetView

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cd /data/data/com.google.android.street rm -R cache mkdir /sdcard/cache/streetCache ln -s /sdcard/cache/streetCache cache

Market Cache

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cd /data/data/com.android.vending rm -R cache mkdir /sdcard/cache/marketCache ln -s /sdcard/cache/marketCache cache

imeem Cache

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cd /data/data/com.imeem.gynoid rm -R cache mkdir /sdcard/cache/imeemCache ln -s /sdcard/cache/imeemCache cache

Tunewiki Cache

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cd /data/data/com.tunewiki.lyricplayer.android/cache rm -R webviewCache mkdir /sdcard/cache/tunewikiCache ln -s /sdcard/cache/tunewikiCache webviewCache

Steel Browser Cache

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cd /data/data/com.kolbysoft.steel/cache rm -R webviewCache mkdir /sdcard/cache/steelCache ln -s /sdcard/cache/steelCache webviewCache

OR

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cd /data/data/com.kolbysoft.steel mkdir cache cd cache mkdir /sdcard/cache/steelCache ln -s /sdcard/cache/steelCache webviewCache

MeetMe Cache

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cd /data/data/com.stylem.meetme rm -R cache mkdir /sdcard/cache/meetmeCache ln -s /sdcard/cache/meetmeCache cache

MySpace

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cd /data/data/com.myspace.android mkdir /system/sd/cache/files/myspace rm -R files ln -s /sdcard/cache/files/myspace files

Gmail

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cd /data/data/com.google.android.gm/cache rm -R webviewCache ln -s /sdcard/cache/webviewCache webviewCache

Voice Search

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cd /data/data/com.google.android.voicesearch/cache rm -R webviewCache ln -s /sdcard/cache/webviewCache webviewCache

My Maps Editor

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cd /data/data/com.google.android.apps.mymaps/cache rm -R webviewCache ln -s /sdcard/cache/webviewCache webviewCache

Credits:

Thanks to birdman81484 for imeemm, Tunewiki, Steel Browser, MeetMe, MySpace