This is not the same as the Android USB drivers. For samsung, it is the Kies software. Similarly, install the software related to your device brand. Usually your device connects to the computer as an MTP device. Sounds weird! But this has proven to be the problem many people had. Try plugging your device to different ports, or try using different cables. If your device is running Android 8. There's no need to begin a recording session, because Android 8. Video 1. With Android 8. If your device is running Android 7.
While recording, the Memory Profiler tracks all allocations that occur in your app. When you're done, click Stop recording the same button; see video 2 to view the allocations. Video 2. With Android 7. After you select a region of the timeline or when you finish a recording session with a device running Android 7. Figure 3. Details about each allocated object appear in the Instance View on the right.
You can use the two menus above the list of allocated objects to choose which heap to inspect and how to organize the data. To improve app performance while profiling, the memory profiler samples memory allocations periodically by default. When testing on devices running API level 26 or higher, you can change this behavior by using the Allocation Tracking dropdown. The options available are as follows:. JNI references are managed manually by the native code, so it is possible for Java objects used by native code to be kept alive for too long.
Some objects on the Java heap may become unreachable if a JNI reference is discarded without first being explicitly deleted. Also, it is possible to exhaust the global JNI reference limit. With this information, you can find when and where global JNI references are created and deleted. While your app is running, select a portion of the timeline that you want to inspect and select JNI heap from the drop-down menu above the class list.
You can then inspect objects in the heap as you normally would and double-click objects in the Allocation Call Stack tab to see where the JNI references are allocated and released in your code, as shown in figure 4. Figure 4. Viewing global JNI references. The Android Studio Memory Profiler includes a Native Memory Profiler for apps deployed to physical devices running Android 10; support for Android 11 devices is currently available in the Android Studio 4.
To initiate a recording, click Record native allocations at the top of the Memory Profiler window:. By default, the Native Memory Profiler uses a sample size of 32 bytes: Every time 32 bytes of memory are allocated, a snapshot of memory is taken. A smaller sample size results in more frequent snapshots, yielding more accurate data about memory usage. A larger sample size yields less accurate data, but it will consume fewer resources on your system and improve performance while recording.
A heap dump shows which objects in your app are using memory at the time you capture the heap dump. Especially after an extended user session, a heap dump can help identify memory leaks by showing objects still in memory that you believe should no longer be there. To capture a heap dump, click Dump Java heap in the Memory Profiler toolbar.
While dumping the heap, the amount of Java memory might increase temporarily. This is normal because the heap dump occurs in the same process as your app and requires some memory to collect the data. The heap dump appears below the memory timeline, showing all class types in the heap, as shown in figure 5.
Figure 5. Viewing the heap dump. If you need to be more precise about when the dump is created, you can create a heap dump at the critical point in your app code by calling dumpHprofData. Native Size : Total amount of native memory used by this object type in bytes. This column is visible only for Android 7. You will see memory here for some objects allocated in Java because Android uses native memory for some framework classes, such as Bitmap.
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