本文介绍的仿IOS对话框的实现，先来看一下效果图

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具体代码如下：

public class AlertDialog {
 private Context context;
 private Dialog dialog;
 private LinearLayout lLayout_bg;
 private TextView txt_title;
 private TextView txt_msg;
 private Button btn_neg;
 private Button btn_pos;
 private ImageView img_line;
 private Display display;
 private boolean showTitle = false;
 private boolean showMsg = false;
 private boolean showPosBtn = false;
 private boolean showNegBtn = false;

 public AlertDialog(Context context) {
  this.context = context;
  WindowManager windowManager = (WindowManager) context
    .getSystemService(Context.WINDOW_SERVICE);
  display = windowManager.getDefaultDisplay();
 }

 public AlertDialog builder() {
  View view = LayoutInflater.from(context).inflate(
    R.layout.view_alertdialog, null);

  lLayout_bg = (LinearLayout) view.findViewById(R.id.lLayout_bg);
  txt_title = (TextView) view.findViewById(R.id.txt_title);
  txt_title.setVisibility(View.GONE);
  txt_msg = (TextView) view.findViewById(R.id.txt_msg);
  txt_msg.setVisibility(View.GONE);
  btn_neg = (Button) view.findViewById(R.id.btn_neg);
  btn_neg.setVisibility(View.GONE);
  btn_pos = (Button) view.findViewById(R.id.btn_pos);
  btn_pos.setVisibility(View.GONE);
  img_line = (ImageView) view.findViewById(R.id.img_line);
  img_line.setVisibility(View.GONE);

  dialog = new Dialog(context, R.style.AlertDialogStyle);
  dialog.setContentView(view);

  lLayout_bg.setLayoutParams(new FrameLayout.LayoutParams((int) (display
    .getWidth() * 0.80), LayoutParams.WRAP_CONTENT));

  return this;
 }

 public AlertDialog setTitle(String title) {
  showTitle = true;
  if ("".equals(title)) {
   txt_title.setText("标题");
  } else {
   txt_title.setText(title);
  }
  return this;
 }

 public AlertDialog setMsg(String msg) {
  showMsg = true;
  if ("".equals(msg)) {
   txt_msg.setText("内容");
  } else {
   txt_msg.setText(msg);
  }
  return this;
 }

 public AlertDialog setCancelable(boolean cancel) {
  dialog.setCancelable(cancel);
  return this;
 }

 public AlertDialog setPositiveButton(String text,
   final OnClickListener listener) {
  showPosBtn = true;
  if ("".equals(text)) {
   btn_pos.setText("确定");
  } else {
   btn_pos.setText(text);
  }
  btn_pos.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    listener.onClick(v);
    dialog.dismiss();
   }
  });
  return this;
 }

 public AlertDialog setNegativeButton(String text,
   final OnClickListener listener) {
  showNegBtn = true;
  if ("".equals(text)) {
   btn_neg.setText("取消");
  } else {
   btn_neg.setText(text);
  }
  btn_neg.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    listener.onClick(v);
    dialog.dismiss();
   }
  });
  return this;
 }

 private void setLayout() {
  if (!showTitle && !showMsg) {
   txt_title.setText("提示");
   txt_title.setVisibility(View.VISIBLE);
  }

  if (showTitle) {
   txt_title.setVisibility(View.VISIBLE);
  }

  if (showMsg) {
   txt_msg.setVisibility(View.VISIBLE);
  }

  if (!showPosBtn && !showNegBtn) {
   btn_pos.setText("确定");
   btn_pos.setVisibility(View.VISIBLE);
//   btn_pos.setBackgroundResource(R.drawable.alertdialog_single_selector);
   btn_pos.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {
     dialog.dismiss();
    }
   });
  }

  if (showPosBtn && showNegBtn) {
   btn_pos.setVisibility(View.VISIBLE);
//   btn_pos.setBackgroundResource(R.drawable.alertdialog_right_selector);
   btn_neg.setVisibility(View.VISIBLE);
//   btn_neg.setBackgroundResource(R.drawable.alertdialog_left_selector);
   img_line.setVisibility(View.VISIBLE);
  }

  if (showPosBtn && !showNegBtn) {
   btn_pos.setVisibility(View.VISIBLE);
//   btn_pos.setBackgroundResource(R.drawable.alertdialog_single_selector);
  }

  if (!showPosBtn && showNegBtn) {
   btn_neg.setVisibility(View.VISIBLE);
//   btn_neg.setBackgroundResource(R.drawable.alertdialog_single_selector);
  }
 }

 public void show() {
  setLayout();
  dialog.show();
 }
}

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