Android學習筆記 - 對話框(Dialog)

1. 利用AlertDialog物件來顯示對話框。

2. MainActivity.java

package org.me.android_dialog;
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();
    }
}

3. main.xml(Layout)

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">" 
    <Button
        android:id="@+id/dialogButton"
        android:layout_width="95px"
        android:layout_height="40px"
        android:text="ShowDialog"
        >
    </Button>
</LinearLayout>

4. 按下ShowDialog按鈕之後出現的畫面