Android 10 topActivity

Introduction

In Android, the topActivity represents the currently visible activity on the screen. It is useful for various purposes, such as monitoring the user's current activity or performing actions based on the current activity. In this article, we will explore how to get the topActivity in Android 10 using code examples.

Prerequisites

Before we start, make sure you have the following:

• Basic knowledge of Android development
• Android Studio installed on your system
• An Android device or emulator running Android 10

Getting the topActivity

To get the topActivity in Android 10, we can use the UsageStatsManager class. This class provides access to the usage statistics of the device, including the topActivity.

First, let's add the necessary permissions to the AndroidManifest.xml file:

<uses-permission android:name="android.permission.PACKAGE_USAGE_STATS" tools:ignore="ProtectedPermissions" />

Next, let's create a helper method to check if the required permission is granted:

private boolean isPermissionGranted() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        AppOpsManager appOps = (AppOpsManager) getSystemService(Context.APP_OPS_SERVICE);
        int mode = appOps.checkOpNoThrow(AppOpsManager.OPSTR_GET_USAGE_STATS,
                android.os.Process.myUid(), getPackageName());
        return mode == AppOpsManager.MODE_ALLOWED;
    }
    return false;
}

In the above code, we are using the AppOpsManager class to check if the PACKAGE_USAGE_STATS permission is granted. This permission is required to access the topActivity.

Now, let's create another method to get the topActivity:

private String getTopActivity() {
    String topActivity = "";

    if (isPermissionGranted()) {
        UsageStatsManager usageStatsManager = (UsageStatsManager) getSystemService(Context.USAGE_STATS_SERVICE);
        long endTime = System.currentTimeMillis();
        long beginTime = endTime - 1000 * 60; // 1 minute ago

        UsageEvents.Event event = new UsageEvents.Event();
        UsageEvents usageEvents = usageStatsManager.queryEvents(beginTime, endTime);
        while (usageEvents.hasNextEvent()) {
            usageEvents.getNextEvent(event);
            if (event.getEventType() == UsageEvents.Event.MOVE_TO_FOREGROUND) {
                topActivity = event.getClassName();
            }
        }
    }

    return topActivity;
}

In the above code, we are using the UsageStatsManager class to query the usage events within the last 1 minute. We iterate through the events and check for the MOVE_TO_FOREGROUND event, which indicates the topActivity. We extract the class name of the topActivity and return it.

Usage example

Now that we have the getTopActivity() method, we can use it in our application. Let's create a simple button in the layout file (activity_main.xml) to display the topActivity:

<Button
    android:id="@+id/btnGetTopActivity"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Get Top Activity" />
<TextView
    android:id="@+id/tvTopActivity"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="16dp" />

Next, let's update the MainActivity class to handle the button click and display the topActivity:

public class MainActivity extends AppCompatActivity {

    private Button btnGetTopActivity;
    private TextView tvTopActivity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        btnGetTopActivity = findViewById(R.id.btnGetTopActivity);
        tvTopActivity = findViewById(R.id.tvTopActivity);

        btnGetTopActivity.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String topActivity = getTopActivity();
                tvTopActivity.setText("Top Activity: " + topActivity);
            }
        });
    }

    // Helper methods to get the topActivity
    // ...

}

In the above code, we are setting up a click listener for the button and calling the getTopActivity() method. We then display the result in the tvTopActivity TextView.

Conclusion

In this article, we have learned how to get the topActivity in Android 10 using the UsageStatsManager class. We have also seen an example of how to use this feature in an application. Remember to handle the required permissions properly and test on a device running Android 10 or above.

Now you can use this knowledge to build powerful applications that can monitor and interact with the user's current activity. Happy coding!