![]() ![]() Let's run through a quick debugging session. By default, this is created for you, so in many cases (including this example) you don't have to worry about it. You must run a debuggable build variant.Debugging is enabled by default on emulated devices. However, if you're using an emulator (which we are for this example), you can ignore this prerequisite. You must enable debugging on a connected device.Check the LLDB check box and click OK to install LLDB Fortunately, the example app for this series ( W2A) doesn't contain C/C++ code, so we can ignore this prerequisite. If your app includes C/C++ source code, you'll need to install LLDB from the SDK Manager (see Figure 3).There are some prerequisites before using this debugging tool: Examine variables and evaluate expressions at runtime.Set breakpoints in your application code (Java, Kotlin, or C/C++).Select a device on which to debug your app.Android Studio's built-in Debug tool offers many capabilities, including the following: Instead you'll want something that lets you debug the app's executable code. For more complicated apps, this form of debugging can be tedious. Using Logcat to log and correct code is okay for very simple apps. More about LogcatĬheck out Google's " Write and View Logs with Logcat" to learn more about Logcat. Furthermore, these messages must contain onCreate and be accepted by the Show only selected application filter. In Figure 2, the only displayed messages are for the example app process running on the emulated Nexus 5X device. Logging messages in the onCreate() method of the example app's main activity (click to enlarge) Calls to the System.out methods accomplish the same thing as log.i() calls calls to the System.err methods accomplish the same thing as log.w() calls. For example, you might call public static int i(String tag, String msg) to log an INFO-level message, or public static int w(String tag, String msg) to log a WARN-level message.įor either method, the string passed to tag identifies the message's source (e.g., the method in which this logging method was called), and the string passed to msg identifies the message being logged.Īlternatively, you could call System.out's and System.err's print() and println() methods. In the source code, you can insert calls to various methods to log messages. ![]()
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