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User guide Configure on-device developer options The Settings app on Android includes a screen called Developer options that lets you configure system behaviors that help you profile and debug your app performance.

For example, you can enable debugging over USB, capture a bug report, enable visual feedback for taps, flash window surfaces when they update, use the GPU for 2D graphics rendering, and more. Note: The list of developer options can vary between Android versions.

Enable developer options and USB debugging Figure 1. Developer options On Android 4. On Android 4. To enable developer options, tap the Build Number option 7 times.

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You probably want to keep this on. When off, most options are disabled except official website of options that don't require communication between the device and your development computer.

General options On Android 8. After you select one or more of the available tiles figure 2open the Quick Settings panel and additional earnings on the Internet without investments 381 the pencil to enter edit mode.

Then, drag the developer tiles from the tiles pane onto the Quick settings panel, and tap the pencil again to exit edit mode. Figure 2. Take bug report: Get a copy of the current device log files to share with someone. When you get a notification that the bug report is ready, tap the notification to share it. System UI demo mode: Makes it easier to take clean screenshots by displaying a generic, preset notification bar that does not show notifications or low battery warnings.

Enable Demo Mode allows you to change the appearance of the status bar using adb demo mode commands. Or you can use Show Demo Mode to hide notifications and display a preset status bar.

Note: The adb demo mode commands might not work on all devices because they are not verified during Android certification testing.

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They're only verified to work on Nexus and Pixel devices. Desktop backup password: Sets a backup password so you can use adb commands to back up and restore device apps and data under password protection.

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Stay awake: Sets your screen to stay on every time you plug it in. You can retrieve the packets, and then use a program like Wireshark to analyze and troubleshoot the information.

Debugging Figure 3. Debugging options enabled Debugging options provide ways to configure on-device debugging, and to establish communication between the device and your development computer.

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The Wait for Debugger option is unavailable until you use Select debug app to select the app to debug. If you enable Wait for Debugger, the selected app waits for the debugger to attach before it executes. Other debugging options include the following: Store logger data persistently on device: Select the type of log messages you want to store persistently on the device.

Options are off, all, all but radio, or kernel only. Select mock location app: Use this option to fake the GPS location of the device to test whether your app behaves the same in other locations. To use this option, download and install a GPS mock location app. Figure 4. View attributes Enable view attribute inspection: Saves view attribute information in the mAttributes member variable of a View instance so it can be used for debugging.

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You can access the attribute information through the Layout Inspector user interface, as shown in Figure 4 without this enabled, the "Attributes" item is not available. Enable GPU debug layers: Available on devices running Android 9 API level 28 and higher, enable this option to allow loading Vulkan validation layers from local device storage.

To learn more, read Vulkan validation layers on Android.

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Networking Figure 5. Addiitonally, to fine-tune the audio playback on the device, tap and set the following options: Bluetooth Audio Codec: Adjust the sound quality codec of your devices by selecting one of the following codecs: SBC: Transfer data to Bluetooth audio output devices such as headphones and speakers. LDAC: Provide high-quality music listening over wireless connections.

Enable Optional Codecs and Disable Optional Codecs: If you have additional codec implementations installed, use these options to enable and disable them. Bluetooth Audio Sample Range: Adjust the number of audio samples per second by selecting an audio codec sample rate.

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Higher sample rates use more resources. Bluetooth Audio Bits Per sample: Set the number of bits of information in each audio sample.

Configure on-device developer options

With a higher the bit rate, the sound is better but the sample file is larger. Bluetooth Audio Channel Mode: Select mono or stereo. Bluetooth Audio LDAC Codec: Optimize the sound to increase audio quality, balance audio and connection quality, increase connection quality, or use an adaptive bit rate to balance audio and connection quality.

The certification applies to Android 4. For more information about logs, see Write and view logs with Logcat.

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Aggressive Official website of options to cellular handover: When the signal is low, makes Wi-Fi more efficient in handing over the data connection to a cellular network. Input Figure 6. Pointer location Enable Show taps to display taps when you touch the screen.

A circle appears under your finger or stylus and follows you as you move around the screen. A tap works like a pointer when you Record a video on your device.

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Enable Pointer Location to show the pointer tap location on the official website of options with cross-hairs. A bar appears across the top of the screen to track the cross-hair coordinates figure 6.

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As you move the pointer, the coordinates in the bar track the cross-hair location and the pointer path draws on the screen. Drawing Figure 7. User interface constructions Drawing options provide visual cues about the app's user interface and how it operates.

Enable Show Layout Bounds to show your app's clip bounds, margins, and other user interface constructions on the device, as shown in figure 7. Window animation scale: Sets the window animation playback speed so you can check its performance at different speeds. A lower scale results in a faster speed. Transition animation scale: Sets the transition animation playback speed so you can check its performance at different speeds.

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Simulate secondary displays: Creates a secondary display as an overlay on the device. This is useful when supporting additional displays with the Presentation API. See Secondary displays.

Hardware accelerated rendering Figure 8. Deuteranomaly color space Hardware accelerated rendering options provide ways to optimize your app for its target hardware platforms by leveraging hardware-based options such as the GPU, official website of options layers, and multisample anti-aliasing MSAA.

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Tap Simulate color space to change the color scheme of the entire device UI. The options refer to types of color blindness. Choices are Disabled no simulated color schemeMonochromacy black, white, and grayDeuteranomaly red-greenProtanomaly red-greenand Tritanomaly blue-yellow.

Protanomaly refers to red-green color blindness with weakness in red colors, and Deuteranomaly shown in figure 8 refers to red-green color blindness with weakness in green colors. Debug GPU overdraw: Displays color-coding on your device so you can visualize how how many times the same pixel has been drawn in the same frame. The visualization shows where your app might be doing more rendering than necessary.

For more information, see Visualize GPU overdraw. Debug non-rectangular clip operations: Turns off the clipping area on the canvas to create unusual non-rectangular canvas areas.

Normally, the clipping area prevents drawing anything outside the bounds of the circular clipping area.

Disable HW overlays: Using the hardware overlay enables each app that displays something on the screen to use less processing power. Without the overlay, an app shares the video memory and has to constantly check for collision and clipping to render a proper image.

The checking uses a lot of processing power. Automatic routing can interfere with apps that are USB-aware. The system ignores any "always use" option, so the user must acknowledge the warning and grant permission every time an app requests access.

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Monitoring Figure 9. Bar representation Monitoring options provide visual information about app performance, such as long thread and GPU operations. For more information, see Profile GPU rendering. Apps Figure Set background process limits Official website of options options help you understand how your app operates on the target device.

Tap Background process limit to set the number of processes that can run in the background at one time. Possible settings are shown in figure Tap Reset ShortcutManager rate-limiting during testing so background apps can continue to call shortcut APIs until the rate limit is reached again. For more information about shortcuts and rate limits, see ShortcutManager. Enable Don't keep activities to increase battery life by destroying every activity as soon as the user leaves the activity's main view.

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