Examples of Handler usage in production apps?

In Android development, the Handler class is commonly used for managing communication between threads, allowing you to send and process Message and Runnable objects associated with a thread’s MessageQueue. Below are some practical examples of using Handlers in production apps.


        // Example of using Handler to post a delayed message
        public class MainActivity extends AppCompatActivity {

            private Handler handler = new Handler(Looper.getMainLooper());

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

                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        // Code to execute after delay
                        Toast.makeText(MainActivity.this, "Delayed Action!", Toast.LENGTH_SHORT).show();
                    }
                }, 3000); // 3000 milliseconds delay
            }
        }

In this example, a Handler is used to display a Toast message after a 3-second delay. This technique can be useful for situations where you need to wait for a specific period before executing certain actions, like showing tips or initiating processes.


        // Example using Handler to update UI from a background thread
        public class MyBackgroundTask {

            private Handler handler;

            public MyBackgroundTask(Handler handler) {
                this.handler = handler;
            }

            public void doBackgroundTask() {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        // Simulate long running task
                        try {
                            Thread.sleep(5000); // 5 seconds
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }

                        // Update UI after task completion
                        handler.post(new Runnable() {
                            @Override
                            public void run() {
                                // Code to update the UI
                                // For example, update a TextView
                                myTextView.setText("Task Complete!");
                            }
                        });
                    }
                }).start();
            }
        }

This example illustrates how to use a Handler to update the UI after completing a lengthy background task. Since UI updates must be performed on the main thread, the Handler facilitates this communication smoothly.

Android Handler Message Runnable Thread UI Updates Background Task

Examples of Handler usage in production apps?

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Examples of Handler usage in production apps?

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