Remote debug live content on an Android device from your Windows, Mac, or Linux computer.//远程实时调试安卓设备的内容。

TL;DR

• Set up your Android device for remote debugging, and discover it from your development machine.
• Inspect and debug live content on your Android device from your development machine.
• Screencast content from your Android device into DevTools.

Requirements

To begin remote debugging, you need:

• Chrome 32 or later installed on your development machine.//电脑上安卓版本号32或者更高的Chrome浏览器。
• USB drivers installed on your development machine, if you‘re using Windows. (Ensure Device Manager reports the USB driver correctly)//电脑上安装了安卓设备对应的usb 驱动。
• A USB cable to connect your Android device to your development machine.//用usb线缆连接安卓设备和电脑。
• Android 4.0 or later.//安卓版本4.0或者更高。
• Chrome for Android installed on your Android device.//安卓设备上安装Chrome浏览器。

Enable USB debugging on your Android device

On your Android device, open up Settings, find the Developer options section, and enable USB debugging. If you‘re running Android 4.2 or later and you can‘t find Developer options you may need to enable it.//开启安卓设备的开发者选项。

Connect and discover your Android device

On your development machine, open Chrome. You should be logged in to one of your user profiles. Remote debugging does not work in incognito or guest mode.//按下F12键进入开发者工具界面，然后点击三个点图案的菜单-->More tools-->Inspect devices。

Open DevTools and select More tools > Inspect devices.

From here you can see the status of all connected remote devices. You don‘t have any devices connected right now, so your dialog should look similar to the following screenshot. Make sure thatDiscover USB devices is enabled.//确保勾选了Discover USB devices。

Connect your Android device to your development machine using a USB cable. You should connect your Android device directly to your development machine, not through any intermediate hubs.

If this is your first time connecting this Android device to this development machine, you should see an unknown device that is pending authorization on your Inspect Devices dialog.

If this is the case, then you need to open the Allow USB debugging prompt on your Android device and grant the permissions.

Tip: If you have encounter any issues during the discovery process, you can start the process anew by going back to Developer options and tapping Revoke USB debugging authorizations.

After allowing USB debugging, you should see your device in the Inspect Devices dialog.

Debug content on Android device from development machine

From the Inspect Devices dialog, select your device from the menu on the left.

From here you can see a variety of information about your connected Andoid device:

• At the top you can see the model name of your Android device followed by its serial number (for example, Nexus 5 #08ae8c2700f43a61).
• If one or more Chrome tabs are open, then you‘ll see a Chrome heading followed by the version number of Chrome that‘s running (for example, Chrome (49.0.2623.105)). If no Chrome tabs are open, you won‘t see a Chrome heading.
• Underneath the Chrome heading, each open tab gets its own heading. You can interact with that tab from this section.
• If there are any running apps using WebView, you‘ll see a heading for each app.

To open a new Chrome tab, enter a URL in the textfield under the Chrome heading and then clickOpen. A new tab automatically opens and loads the specified URL.

To reload, focus, or close an open tab, click the more options icon next to the inspect button.

To open up DevTools on your development machine and inspect or debug the live content on your Android device, click the Inspect button next to the tab that you want to investigate. A new instance of DevTools opens up on your development machine.

Note: The version of Chrome on your Android device determines the version of DevTools on your development machine used during remote debugging. So, the DevTools window on your development machine may look different than what you‘re used to.

When you hover over or select an element in the Elements panel, that element is highlighted on your Android device.

You can also tap on your Android device screen to select an element. First, click on the select element () button in DevTools, and then tap on your Android device screen. The element is selected in the Elements panel of DevTools. Note that the select element button is automatically disabled after the first touch, so you need to re-enable it every time that you want to use this feature.

Screencast from Android device to development machine

Enable the toggle screencast button () to view a screencast of the content on your Android device from within your DevTools window.

Screencasts only display page content. Transparent portions of the screencast represent device interfaces, such as the Chrome omnibox, the Android status bar, or the Android keyboard.

Note: Screencasts continuously capture frames, so you should disable your screencast if your test is sensitive to frame rates.

You can interact with the screencast in multiple ways:

• Clicks are translated into taps, firing proper touch events on the device.
• Keystrokes on your computer are sent to the device.
• To simulate a pinch gesture, hold Shift while dragging.
• To scroll, use your trackpad or mouse wheel, or fling with your mouse pointer.