Androidでダイアログを作るサンプルコード

MainActivity.java

package com.main;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

	EditText resultText = null;
	ProgressDialog progressDialog = null;
	int progressCount = 0;
	Handler progressHandler = null;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        resultText = (EditText)findViewById(R.id.textResult);

        Button button1;
        button1 = (Button)findViewById(R.id.button1);
        button1.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this)
				.setTitle("Alert Dialog")
				.setMessage("Alert Dialog with Three Buttons.")
				.setPositiveButton("OK", new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						resultText.setText("Alert Dialog [OK] pressed");
					}
				})
				.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						resultText.setText("Alert Dialog [Cancel] pressed");
					}
				})
				.setNeutralButton("Neutral", new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						resultText.setText("Alert Dialog [Neutral] pressed");
					}
				})
				.create();
				alertDialog.show();

			}
		});

        final String[] dialogItems = new String[]{
        		"one",
        		"two",
        		"three",
        		"four"
        };

        Button button2;
        button2 = (Button)findViewById(R.id.button2);
        button2.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this)
				.setTitle("Alert Dialog List")
				.setItems(dialogItems, new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						resultText.setText(dialogItems[which]);
					}
				})
				.create();
				alertDialog.show();

			}
		});

        Button button3;
        button3 = (Button)findViewById(R.id.button3);
        button3.setOnClickListener(new OnClickListener() {
			public void onClick(View v) {
				progressDialog = new ProgressDialog(MainActivity.this);
				progressDialog.setTitle("Progress Dialog");
				progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
				progressDialog.setMax(100);

				progressDialog.setButton("OK", new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						resultText.setText("Progress Dialog [OK] pressed at " + progressCount + "%");
					}
				});
				progressDialog.setButton2("Cancel", new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
						resultText.setText("Progress Dialog [Cancel] pressed at " + progressCount + "%");
					}
				});

				progressCount = 0;
				progressDialog.show();
				progressDialog.setProgress(0);

                                // このメソッドを呼ぶことにより、プログレスバーがhandleMessage()をコールバックするようになる
				progressHandler.sendEmptyMessage(0);
			}
		});

        progressHandler = new Handler() {
        	public void handleMessage(Message msg) {
        		super.handleMessage(msg);
        		if(progressCount >= 100){
        			progressDialog.dismiss();
        			resultText.setText("progress Dialog finished " + progressCount + "%");
        		}
        		else{
        			progressCount++;
        			progressDialog.incrementProgressBy(1);
        			progressHandler.sendEmptyMessageDelayed(0, 100);
        		}
        	};
        };

    }
}