Progress

 To implement a ProgressBar in Android, you can use the `ProgressBar` widget. Here's an example XML layout:

```xml

<ProgressBar

    android:id="@+id/progressBar"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    style="?android:attr/progressBarStyle"/>

```

In your Java or Kotlin code, you can interact with the `ProgressBar`:

```java

public class YourActivity extends AppCompatActivity {

    private ProgressBar progressBar;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.your_layout);

        progressBar = findViewById(R.id.progressBar);

        // You can set the progress programmatically if needed

        // progressBar.setProgress(50); // Set progress to 50%

        // You can also show/hide the ProgressBar

        // progressBar.setVisibility(View.VISIBLE); // Show

        // progressBar.setVisibility(View.GONE); // Hide

    }

}

```

In this example, the `ProgressBar` is initially defined in the XML layout. You can also customize its appearance further by using different styles. In the Java or Kotlin code, you can interact with the `ProgressBar` by setting the progress programmatically or controlling its visibility.

Remember to replace `"your_layout"` with the actual name of your layout XML file.