Android中AlertDialog四种对话框的最科学编写用法(实例代码)

首先我们上图：

 xml的代码如下，用于编写按钮：

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background"
xmlns:widget="http://schemas.android.com/apk/res-auto"
android:orientation="vertical">
  <button
    android:id="@+id/button_1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="简单的dialog"
    />
  <button
    android:id="@+id/button_2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="列表的dialog"
    />
  <button
    android:id="@+id/button_3"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="单选的dialog"
    />
  <button
    android:id="@+id/button_4"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="多选的dialog"
    />
</linearlayout>

java代码如下，用于实现逻辑：

import androidx.appcompat.app.actionbar;
import androidx.appcompat.app.alertdialog;
import androidx.appcompat.app.appcompatactivity;
import android.content.dialoginterface;
import android.os.bundle;
import android.view.view;
import android.widget.button;
import android.widget.toast;
public class mainactivity extends appcompatactivity{
  int index;
  string [] item = {"android","ios","spark","hadoop","web"};
  boolean[] bools = {false,false,false,false,false};
  // 设置boolean数组所有的选项设置默认没选
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    actionbar actionbar = getsupportactionbar();
    if (actionbar != null) {
      actionbar.hide();
    }
    button button=(button)findviewbyid(r.id.button_1);
    button.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view view) {
        alertdialog.builder builder = new alertdialog.builder(mainactivity.this);
        builder.seticon(r.drawable.girl);
        builder.settitle("标题栏");
        builder.setmessage("对话框内容，可自行设置");
        builder.setpositivebutton("确定",new dialoginterface.onclicklistener() {
          @override
          public void onclick(dialoginterface dialog, int which) {
            toast.maketext(mainactivity.this, "点击了确定", toast.length_short).show();
          }
        });
        builder.setnegativebutton("取消", new dialoginterface.onclicklistener() {
          @override
          public void onclick(dialoginterface dialoginterface, int i) {
            toast.maketext(mainactivity.this, "点击了取消", toast.length_short).show();
          }
        });
        builder.setneutralbutton("好的", new dialoginterface.onclicklistener() {
          @override
          public void onclick(dialoginterface dialoginterface, int i) {
            toast.maketext(mainactivity.this, "点击了“好的”", toast.length_short).show();
          }
        });
        alertdialog alertdialog = builder.create();
        alertdialog.show();
      }
    });
    button button2=(button)findviewbyid(r.id.button_2);
    button2.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view view) {
        alertdialog.builder builder = new alertdialog.builder(mainactivity.this);
        builder.settitle("请选择一个技术分支");
        builder.setitems(item, new dialoginterface.onclicklistener() {
          @override
          public void onclick(dialoginterface dialog, int which) {
            toast.maketext(mainactivity.this, "选择了"+item[which], toast.length_short).show();
          }
        });
        // 取消可以不添加
        //builder.setnegativebutton("取消",null);
        alertdialog alertdialog = builder.create();
        alertdialog.show();
      }
    });
    button button3=(button)findviewbyid(r.id.button_3);
    button3.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view view) {
        alertdialog.builder builder = new alertdialog.builder(mainactivity.this);
        builder.settitle("请选择技术分支：");
        builder.setsinglechoiceitems(item, index, new dialoginterface.onclicklistener() {
          @override
          public void onclick(dialoginterface dialog, int which) {
            index = which;
          }
        });
        builder.setpositivebutton("确定", new dialoginterface.onclicklistener() {
          @override
          public void onclick(dialoginterface dialog, int which) {
            toast.maketext(mainactivity.this, "选择了"+item[index], toast.length_short).show();
          }
        });
        builder.setnegativebutton("取消",null);
        alertdialog alertdialog = builder.create();
        alertdialog.show();
      }
    });
    button button4=(button)findviewbyid(r.id.button_4);
    button4.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view view) {
        alertdialog.builder builder = new alertdialog.builder(mainactivity.this);
        builder.settitle("请选择技术分支：");
        builder.setmultichoiceitems(item, bools, new dialoginterface.onmultichoiceclicklistener() {
          @override
          public void onclick(dialoginterface dialog, int which, boolean ischecked) {
            bools[which] = ischecked;
          }
        });
        builder.setpositivebutton("确定", new dialoginterface.onclicklistener() {
          @override
          public void onclick(dialoginterface dialog, int which) {
            stringbuffer sb = new stringbuffer();
            for (int i = 0; i < item.length; i++) {
              if (bools[i]) {
                sb.append(item[i] + " ");
              }
            }
            toast.maketext(mainactivity.this, "选择了" + sb.tostring(), toast.length_short).show();
          }
        });
        builder.setnegativebutton("取消",null);
        alertdialog alertdialog = builder.create();
        alertdialog.show();
      }
    });
  }
}

总结

以上所述是小编给大家介绍的android中alertdialog四种对话框的最科学编写用法，希望对大家有所帮助