Unresponsive App Example

HandlerExample.java

package com.blogspot.unixnme.handlerexample;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class HandlerExample extends Activity {
    private static String TAG = HandlerExample.class.getSimpleName();

    private Button taskButton;
    private Button incrementButton;
    private TextView textView;
    private int counter = 0;

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

        textView = (TextView) findViewById(R.id.text_vew);
        taskButton = (Button) findViewById(R.id.button);
        incrementButton = (Button) findViewById(R.id.increment_button);

        // when the taskButton is pressed, do some long task, simulated by sleep
        taskButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                taskButton.setText("Busy");
                Thread task = new Thread(new Runnable() {
                    public void run() {
                        try {
                            Thread.sleep(3000);
                        } catch (Throwable t) {
                            Log.d(TAG, t.getMessage());
                        }
                    }
                });
                task.start();
                try {
                    task.join();
                } catch (Throwable t) {
                    Log.d(TAG, t.getMessage());
                }
                taskButton.setText("Ready");
            }
        });

        // when the incrementButton is pressed, it will simply increment the counter
        incrementButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                textView.setText(Integer.toString(++counter));
            }
        });
    }
}