44

To understand why Nexus 7 can show more content than the Galaxy Nexus, I'll first explain two concepts: screen density and density-independent-pixel. But before we go into technical details, it may be worth to clarify the design goals of using density-independent-pixels. The goal is to define a UI that is similar in dimension across devices, regardless of ...


37

Start with the Android compatibility page. This outlines goals for Android's compatibility and links to the current Compatibility Definition Document which has the technical requirements. All versions of the CDD to date are below. Android 8.0 "Oreo" Android 7.0 and Android 7.1 "Nougat" Android 6.0 "Marshmallow" Android 5.0 and Android 5.1 "Lollipop" ...


22

JTAG and Android are two separate things. You may find JTAG pins visible either under your device's battery or near its SIM / MicroSD card holder. The pins are hidden. You may have to dismantle your phone's back cover. The JTAG pins are usually six gold pins clustered close to each other, as shown in this photo: Click to enlarge You use a special hardware ...


19

On some devices, yes, there is a way. I am not certain which specific devices this works on, but there are two methods you can try. The most platform agnostic way to do it is generally the following: Install a launcher that allows you to create shortcuts to Activities. ADW Launcher and Launcher Pro are both free and allow this. Long press on an empty space ...


16

The typical audio only jack has 3 rings, usually call Tip, Ring, Sleeve (TRS). These typically map to Left, Right, and Ground. Phone manufactures wanted to make this jack work with existing headphone so they used a connector with 4 rings, called Tip, Ring, Ring, Sleeve (TRRS). These map to Left, Right, and Ground just like the 3 ring, but the final connector ...


14

While this is standard cover-your-assets boilerplate, the truth is you can charge your phone off of pretty much any USB charger out there, as long as the following things are true: The output specification is +5V DC, and at least 500mA. If it's more (700mA, 1000mA) you are generally fine; the phone will only draw what it needs. My HTC Magic's "official" ...


12

There are several factors, which I'll address (pun intended) in no particular order. RAM is expensive Sure, memory chips may be cheap, but that's not the only (or even the main) cost. Alongside the RAM itself you need extra buses, power lines, bigger memory controllers, heatsinks, &c. The RAM also takes physical space on-chip. For oomph-per-dollar, at ...


11

Android tracks events that affect battery usage and stores this information in batterystats.bin file. Some examples: length of time screen was on with a specific brithness setting which application (or non Android app process) and how long held a wake lock (prevents device from sleeping) CPU usage per process (Android app or other process) ...


11

This is for the NFC functionality. Those contacts are used to transmit the info to and from the receiver/transmitter on the back cover (seen below outlined in green, though you probably guessed it :) ). They have to put it on the back cover because NFC only works for usually no more than a few centimetres, and they need a way to feed the information back to ...


10

Broadly speaking, if you have a "USB" cable that only connects pins 1 & 4 then you will get power and no data (Best Buy was selling cables like that as Universal USB Charging Cables a while back, not sure if they still do). Likewise, if you have a cable with only 2 & 3, you will get data but no power. If you're curious, here's a Wikipedia page with ...


10

For the best resource out there, use PDADB. This details every comprehensive chip-set used, for the Droid Charge, this is the spec sheet given. As for Huawei U8160, this is the spec sheet given on that page. Depending on how open the manufacturer is with the more intimate details, some may be marked proprietary which will be stated clearly. The other ...


9

No. Apple's older iOS lineup and Samsung's Android tablets have a similar looking but different connector. You can't interchange them. And besides this: Apple's new ligthning plug clearly only works with iOS devices (iPhone 5 and iPad 4/mini and better). The available lightning-adapters also only work with iOS devices.


9

Random force closes are only suspicious if it's truly random (i.e. no plausible causes) and it's only happening on your device. In most other cases, it's simply due to poorly coded third party apps. There are two kinds of force close dialogs: Android offers to force close applications that fail to respond to an input event within five seconds. When this ...


9

Motorola Droid 4 XT894 has 1785mAh battery with 2% tolerance i.e 1735mAh actual battery capacity. Your seller seems to have fooled you. Also it doesn't seem like the seller put up the battery description as 3300mAh by mistake as he has put this in Title name itself You could have taken out the battery from phone and flipped it to see the battery capacity ...


8

Don't forget to check for water damage. Every phone that is sold by a reputable retailer (T-Mobile, Cingular, Verizon, Sprint, etc.) should contain a tiny indicator that clearly shows if water has attacked your phone. This little item is typically called the liquid damage indicator, or LDI for short. In almost every case, a red or pink indicator ...


8

http://www.ifixit.com/Teardown/ A good starting point. They usually note also the chip/part numbers in their teardown reports.


8

All computers have a special piece of hardware called the clock (more fully, the real-time clock or RTC). The clock is connected to the CPU, but it runs even when the computer is completely powered down. On a desktop computer, a battery on the motherboard keeps the clock running even when it's unplugged from the mains. Mobile devices tend to have a large ...


8

On desktops and laptops, drivers are a necessary evil. Hardware is often user-serviceable and prone to changes, and there is a huge variety of possible combinations. On phones and tablets, this isn't quite so. You can't really change the hardware easily. It's entirely safe to disallow driver installation since you don't really need it. It is a lot easier to ...


8

uname -m will display the architecture of the running kernel. This is different than whatever your hardware may be capable of running. Unfortunately, you have to know which architectures are 32-bit and which are 64-bit. But you can easily find this out. For example, my m7 displays arm7l. A quick search confirms that this is a 32-bit architecture, meaning ...


7

That's because the pixels per inch (PPI) is different between them. The higher the PPI, the higher the quality but at a cost of (relative) smaller screen size. So the Nexus 7 has 216 pixels per inch while the Galaxy Nexus has 316 pixels per inch. The resolution isn't everything, you also have to consider the density of the pixels. High PPI values have the ...


7

You can use an external Bluetooth or USB keyboard with the Nexus 7. For more information see the Connect to keyboards, mice, & other devices section of the Nexus 7 manual. Mike Elgan reports that the Nexus 7 also works with an Apple Bluetooth keyboard.


7

This may not be as easy as you think. The eMMC is connected to the board with a Ball Grid Array (BGA) connection, which is pretty difficult to reconnect once removed. You can see photos of the chip and more discussion on the topic on this XDA post. As for where the chip is, you might be able to find it on some teardowns, but my eyes didn't catch it in ...


6

As devnul3 says, a power-only cable is a USB cable where the data pins are not connected. The main reason they exist is because they can be made ever so slightly cheaper by virtue of only needing 2 connections instead of 4 (and also because you don't need to worry about preserving the quality of the very high frequency signals on the data lines). This said,...


6

You also might want to check with Voodoo CarrierIQ detector if this device is clean. Besides, I also bought a used one and when you manage to reset it you should be fine. Type *2767*3855# for this if the password is no longer available. If your password for resetting is still available (e.g. if the previous owner knows it) there is no need for this ...


6

Phablets are basically tablet / phone crossovers. Best examples are Samsung’s Galaxy Note and LG’s Optimus Vu. As per ComputerWorld: A phablet is a phone with a screen so big that it can be used as a tablet. There are no defined boundaries whatsoever in terms of screen sizes; so any tablet with phone (telephony) capabilities might also be termed a ...


6

Android does not have "device drivers". If you were to think of the entire Android ecosystem within your handset, split into 3/4, using the Java Programming language, the remaining 1/4 is the kernel written in C/Assembler. It is there within the kernel is where the drivers are embedded. That is part of the kernel's job to interact with touchscreen, ...


6

In this specific case your friend is correct, but it can probably vary somewhat. We'll take the Galaxy Nexus as an example since it's a reasonably accurate internal representation of the other Samsung devices. The iFixit teardown helpfully identifies all of the major components of the device and their function. In step 5 they remove the wrapping from the ...


6

Yes, a "regular" set of headphones will work just fine, in much the same way that a single-channel earphone works in a stereo headphone jack. The other bits are for the microphone and the controls, but since your headphones won't have those it won't matter. I have had occasion to use 1st generation iPod earbuds as well as some generic earbuds in my Galaxy ...


6

The "Hardware Backed Credential Storage" aka "Android Key Store" is only hardware backed when the hardware on the device has the necessary hardware components in it. When there isn't the necessary hardware available it falls back to software storage. Android also now supports hardware-backed storage for your KeyChain credentials, providing more security ...


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