安卓飛機大戰（三） 彈出對話框

在游戲時，不管是退出游戲還是選擇戰機，都要彈出一個對話框，需要以下代碼

按一個按鈕彈出對話框

Layout文件：（添加一個按鈕）

<Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="準備起飛" />

在MainActivity 中:

public class choiceActivity extends Activity {
    private Button button1;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.choice);
        button1=(ImageButton)findViewById(R.id.p_w_picpathButton1);
        button2=(ImageButton)findViewById(R.id.p_w_picpathButton2);
        button1.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View arg0) {
                AlertDialog.Builder builder = new AlertDialog.Builder(choiceActivity.this);
                //    設置Title的圖標
                builder.setIcon(R.drawable.ic_yxlm);
                //    設置Title的內容
                builder.setTitle("進入游戲");
                //    設置Content來顯示一個信息
                builder.setMessage("確定選擇進入游戲嗎？");
                //    設置一個PositiveButton
                builder.setPositiveButton("確定", new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        Toast.makeText(choiceActivity.this, "進入游戲 ", Toast.LENGTH_SHORT).show();
                        Intent intent=new Intent(choiceActivity.this,userActivity.class);
                        startActivity(intent);//跳轉到下一個界面userActivity

                        finish();
                    }
                });
                //    設置一個NegativeButton
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener()
                {
                    @Override
                    public void onClick(DialogInterface dialog, int which)
                    {
                        Toast.makeText(choiceActivity.this, "繼續選擇", Toast.LENGTH_SHORT).show();
                    }
                });
                builder.show();
                
            }
        });

}

這樣就可以實現一個對話框了！