Android自定义单例AlertDialog详解

当android开发处理错误信息时，经常会以dialog的形式显示错误信息，但是每次都new一个dialog，很麻烦，也增加程序的开销，所以今天就分享一种自定义单例alertdialog

public class alertdialog {
  private static alertdialog alertdialog = null;
  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 static alertdialog getinstance(context context){
    if (alertdialog==null){
      synchronized (alertdialog.class) {
        if (alertdialog == null) {
          alertdialog = new alertdialog(context).builder();
        }
      }
    }
    return alertdialog;
  }
  public alertdialog(context context) {
    this.context = context;
    windowmanager windowmanager = (windowmanager) context
        .getsystemservice(context.window_service);
    display = windowmanager.getdefaultdisplay();
  }

  public alertdialog builder() {
    // 获取dialog布局
    view view = layoutinflater.from(context).inflate(r.layout.view_alertdialog, null);

    // 获取自定义dialog布局中的控件
    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);

    // 定义dialog布局和参数
    dialog = new dialog(context, r.style.alertdialogstyle);
    dialog.setcontentview(view);

    // 调整dialog背景大小
    llayout_bg.setlayoutparams(new framelayout.layoutparams((int) (display
        .getwidth() * 0.85), 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 setmsg(int rid) {
    showmsg = true;
    txt_msg.settext(rid);
    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) {
        if(listener!=null) {
          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) {
        if(listener!=null) {
          listener.onclick(v);
        }
        dialog.dismiss();
      }
    });
    return this;
  }

  private void setlayout() {
    if (!showtitle && !showmsg) {
      txt_title.settext("");
      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();
  }
}

布局文件view_alertdialog.xml

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/llayout_bg"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="@drawable/alert_bg"
  android:orientation="vertical">

  <textview
    android:id="@+id/txt_title"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginleft="15dp"
    android:layout_marginright="15dp"
    android:layout_margintop="15dp"
    android:gravity="center"
    android:text="提示"
    android:textcolor="@color/black"
    android:textsize="18dp" />


  <textview
    android:id="@+id/txt_msg"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginleft="15dp"
    android:layout_marginright="15dp"
    android:layout_margintop="10dp"
    android:layout_marginbottom="10dp"
    android:gravity="center"
    android:text="您确定要退出吗？"
    android:textcolor="@color/black"
    android:textsize="16dp" />

  <imageview
    android:layout_width="match_parent"
    android:layout_height="0.5dp"
    android:layout_margintop="10dp"
    android:background="@color/alertdialog_line" />

  <linearlayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <button
      android:id="@+id/btn_neg"
      android:layout_width="wrap_content"
      android:layout_height="43dp"
      android:layout_weight="1"
      android:background="@drawable/alertdialog_left_selector"
      android:gravity="center"
      android:text="确定"
      android:textcolor="@color/bigtextcolor"
      android:textsize="16sp" />

    <imageview
      android:id="@+id/img_line"
      android:layout_width="0.5dp"
      android:layout_height="43dp"
      android:background="@color/alertdialog_line" />

    <button
      android:id="@+id/btn_pos"
      android:layout_width="wrap_content"
      android:layout_height="43dp"
      android:layout_weight="1"
      android:background="@drawable/alertdialog_right_selector"
      android:gravity="center"
      android:text="取消"
      android:textcolor="@color/themecolor"
      android:textsize="16sp" />
  </linearlayout>

</linearlayout>

效果显示

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