對話框

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" 
    android:orientation="vertical"
    >

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="確定取消對話框" 
        android:onClick="click1"
        />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="單選對話框" 
        android:onClick="click2"
        />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="多選對話框" 
        android:onClick="click3"
        />

</LinearLayout>

public class MainActivity extends Activity {

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

	
	public void click1(View v){
		AlertDialog.Builder builder = new Builder(this);
		//設置圖標
		builder.setIcon(android.R.drawable.alert_dark_frame);
		//設置標題
		builder.setTitle("欲練此功必先自宮");
		//設置文本
		builder.setMessage("李志平，想清楚哦");
		
		//設置確定按鈕
		builder.setPositiveButton("確定", new OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				Toast.makeText(MainActivity.this, "感謝使用本軟件,再見", 0).show();
			}
		});
		
		//設置取消按鈕
		builder.setNegativeButton("取消", new OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				Toast.makeText(MainActivity.this, "若不自宮,一定不成功", 0).show();
			}
		});
		//使用創建器,生成一個對話框對象
		AlertDialog ad = builder.create();
		ad.show();
	}

	public void click2(View v){
		AlertDialog.Builder builder = new Builder(this);
		builder.setTitle("請選擇性別");
		final String[] items = new String[]{
				"男",
				"女"
		};
		
		builder.setSingleChoiceItems(items, -1, new OnClickListener() {
			
			//which:用戶所選的條目的下標
			//dialog:觸發這個方法的對話框
			@Override
			public void onClick(DialogInterface dialog, int which) {
				Toast.makeText(MainActivity.this, "您選擇的是:" + items[which], 0).show();
				//關閉對話框
				dialog.dismiss();
			}
		});
		builder.show();
	}
	
	public void click3(View v){
		AlertDialog.Builder builder = new Builder(this);
		builder.setTitle("請選擇您覺得帥的人");
		final String[] items = new String[]{
				"侃哥",
				"趙帥哥",
				"趙老師",
				"趙師兄"
		};
		final boolean[] checkedItems = new boolean[]{
				true,
				true,
				false,
				false
				
		};
		
		builder.setMultiChoiceItems(items, checkedItems, new OnMultiChoiceClickListener() {
			
			//which:用戶點擊的條目的下標
			//isChecked:用戶是選中該條目還是取消該條目
			@Override
			public void onClick(DialogInterface dialog, int which, boolean isChecked) {
				checkedItems[which] = isChecked;
				
			}
		});
		
		//設置一個確定按鈕
		builder.setPositiveButton("確定", new OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				String text = "";
				for(int i = 0; i < 4; i++){
					text += checkedItems[i]? items[i] + "," : "";
				}
				Toast.makeText(MainActivity.this, text, 0).show();
				dialog.dismiss();
			}
		});
		builder.show();
	}
}