MainActivity.java

package com.bigfat.uiwidgettest;

import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ProgressBar;

public class MainActivity extends ActionBarActivity implements View.OnClickListener {

    private Button button;
    private EditText editText;
    private ImageView imageView;
    private ProgressBar progressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button);
        editText = (EditText) findViewById(R.id.edit_text);
        imageView = (ImageView) findViewById(R.id.image_view);
        progressBar = (ProgressBar) findViewById(R.id.progress_bar);

        button.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button:
//                String inputText = editText.getText().toString();
//                Toast.makeText(MainActivity.this, inputText, Toast.LENGTH_SHORT).show();

//                imageView.setImageResource(R.drawable.dragoncat);

//                if (progressBar.getVisibility() == View.GONE) {
//                    progressBar.setVisibility(View.VISIBLE);
//                } else {
//                    progressBar.setVisibility(View.GONE);
//                }

//                int progress = progressBar.getProgress();
//                progress += 10;
//                progressBar.setProgress(progress);

//                AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
//                dialog.setTitle("This is Dialog");
//                dialog.setMessage("something important");
//                dialog.setCancelable(false);
//                dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
//                    @Override
//                    public void onClick(DialogInterface dialog, int which) {
//
//                    }
//                });
//                dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
//                    @Override
//                    public void onClick(DialogInterface dialog, int which) {
//
//                    }
//                });
//                dialog.show();

                ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
                progressDialog.setTitle("This is ProgressDialog");
                progressDialog.setMessage("Loading...");
                progressDialog.setCancelable(true);
                progressDialog.show();
                break;

            default:
                break;
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}