[Android程式範例] AlertDialog基礎使用範例教學

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
    private Button dialogButton;
    
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        dialogButton = (Button) findViewById(R.id.dialogButton);
        final AlertDialog alertDialog = getAlertDialog("這是一個對話框","請選擇......");
        dialogButton.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(final View view) {
                //顯示對話框
                alertDialog.show();
            }
        });
    }

    private AlertDialog getAlertDialog(String title,String message){
        //產生一個Builder物件
        Builder builder = new AlertDialog.Builder(MainActivity.this);
        //設定Dialog的標題
        builder.setTitle(title);
        //設定Dialog的內容
        builder.setMessage(message);
        //設定Positive按鈕資料
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //按下按鈕時顯示快顯
                Toast.makeText(MainActivity.this, "您按下OK按鈕", Toast.LENGTH_SHORT).show();
            }
        });
        //設定Negative按鈕資料
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                //按下按鈕時顯示快顯
                Toast.makeText(MainActivity.this, "您按下Cancel按鈕", Toast.LENGTH_SHORT).show();
            }
        });
        //利用Builder物件建立AlertDialog
        return builder.create();
    }
}