AndroidStudio中AlertDialog的四种用法

目录

1.默认样式

2.单选弹出框

3.多选弹出框

4.自定义弹出框

补充！！

1.默认样式

android.support.v7.app.AlertDialog.Builder builder = new android.support.v7.app.AlertDialog.Builder(AlertDialogActivity.this); builder.setTitle("请回答"); builder.setMessage("你觉得我好看吗？？"); builder.setPositiveButton("当然是好看了！！", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(AlertDialogActivity.this, "嘻嘻嘻",Toast.LENGTH_SHORT).show(); } }); builder.setNeutralButton("我觉得一般", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(AlertDialogActivity.this,"那你再瞅瞅~",Toast.LENGTH_SHORT).show(); } }); builder.setNegativeButton("我觉得不好看", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { Toast.makeText(AlertDialogActivity.this,"嘤嘤嘤",Toast.LENGTH_SHORT).show(); } }); builder.show();

2.单选弹出框

final String[] gender = new String[]{"帅哥","美女"}; android.support.v7.app.AlertDialog.Builder builder1=new android.support.v7.app.AlertDialog.Builder(AlertDialogActivity.this); builder1.setTitle("请选择你的性别"); builder1.setItems(gender, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ToastUtil.showMsg(AlertDialogActivity.this,gender[which]); } }); builder1.show();

android.support.v7.app.AlertDialog.Builder builder2=new android.support.v7.app.AlertDialog.Builder(AlertDialogActivity.this); builder2.setTitle("你最喜欢吃一下那种菜肴："); final String[] dish =new String[]{"红烧牛肉","粉蒸排骨","油焖大虾","蒜蓉扇贝"}; builder2.setSingleChoiceItems(dish, 1, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ToastUtil.showMsg(AlertDialogActivity.this,dish[which]); dialog.dismiss(); } }); builder2.setCancelable(false); builder2.show(); break;

3.多选弹出框

String[] dessert = new String[]{"抹茶千层","芒果拿破仑","草莓雪媚娘","蓝莓慕斯"}; boolean[] begin = new boolean[]{false,false,false,false}; android.support.v7.app.AlertDialog.Builder builder3=new android.support.v7.app.AlertDialog.Builder(AlertDialogActivity.this); builder3.setTitle("你吃过以下哪些甜点"); builder3.setMultiChoiceItems(dessert, begin, new DialogInterface.OnMultiChoiceClickListener() { @Override public void onClick(DialogInterface dialog, int which, boolean isChecked) { } }); builder3.setPositiveButton("确认", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ToastUtil.showMsg(AlertDialogActivity.this,"好的，我知道啦！"); } }); builder3.setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { ToastUtil.showMsg(AlertDialogActivity.this,"难道你都没有吃过？？"); } }); builder3.show(); break;

4.自定义弹出框

自定义Dialog的xml样式

自定义Dialog组件，CustomDialog.java

public class CustomDialog extends Dialog implements View.OnClickListener { //声明xml文件里的组件 private TextView tv_title,tv_message; private Button bt_cancel,bt_confirm; //声明xml文件中组件中的text变量，为string类，方便之后改 private String title,message; private String cancel,confirm; //声明两个点击事件，等会一定要为取消和确定这两个按钮也点击事件 private IOnCancelListener cancelListener; private IOnConfirmListener confirmListener; //设置四个组件的内容 public void setTitle(String title) { this.title = title; } public void setMessage(String message) { this.message = message; } public void setCancel(String cancel,IOnCancelListener cancelListener) { this.cancel = cancel; this.cancelListener=cancelListener; } public void setConfirm(String confirm,IOnConfirmListener confirmListener){ this.confirm=confirm; this.confirmListener=confirmListener; } //CustomDialog类的构造方法 public CustomDialog(@NonNull Context context) { super(context); } public CustomDialog(@NonNull Context context, int themeResId) { super(context, themeResId); } //在app上以对象的形式把xml里面的东西呈现出来的方法！ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //为了锁定app界面的东西是来自哪个xml文件 setContentView(R.layout.custom_dialog); //设置弹窗的宽度 WindowManager m = getWindow().getWindowManager(); Display d = m.getDefaultDisplay(); WindowManager.LayoutParams p =getWindow().getAttributes(); Point size = new Point(); d.getSize(size); p.width = (int)(size.x * 0.8);//是dialog的宽度为app界面的80% getWindow().setAttributes(p); //找到组件 tv_title=findViewById(R.id.tv_title); tv_message=findViewById(R.id.tv_message); bt_cancel=findViewById(R.id.bt_cancel); bt_confirm=findViewById(R.id.bt_confirm); //设置组件对象的text参数 if (!TextUtils.isEmpty(title)){ tv_title.setText(title); } if (!TextUtils.isEmpty(message)){ tv_message.setText(message); } if (!TextUtils.isEmpty(cancel)){ bt_cancel.setText(cancel); } //为两个按钮添加点击事件 bt_confirm.setOnClickListener(this); bt_cancel.setOnClickListener(this); } //重写onClick方法 public void onClick(View view) { switch (view.getId()){ case R.id.bt_cancel: if(cancelListener!=null){ cancelListener.onCancel(this); } dismiss(); break; case R.id.bt_confirm: if(confirmListener!=null){ confirmListener.onConfirm(this); } dismiss();//按钮按之后会消失 break; } } //写两个接口，当要创建一个CustomDialog对象的时候，必须要实现这两个接口 //也就是说，当要弹出一个自定义dialog的时候，取消和确定这两个按钮的点击事件，一定要重写！ public interface IOnCancelListener{ void onCancel(CustomDialog dialog); } public interface IOnConfirmListener{ void onConfirm(CustomDialog dialog); } } 

使用自定义的弹出框组件

CustomDialog customDialog = new CustomDialog(CustomDialogActivity.this); customDialog.setTitle("提醒"); customDialog.setMessage("你确定要删除吗?"); customDialog.setCancel("cancel", new CustomDialog.IOnCancelListener() { @Override public void onCancel(CustomDialog dialog) { Toast.makeText(CustomDialogActivity.this, "取消成功！",Toast.LENGTH_SHORT).show(); } }); customDialog.setConfirm("confirm", new CustomDialog.IOnConfirmListener(){ @Override public void onConfirm(CustomDialog dialog) { Toast.makeText(CustomDialogActivity.this, "确认成功！",Toast.LENGTH_SHORT).show(); } }); customDialog.show();

以上代码中用到的ToastUtil类，是我自定义的一个类，目的是把Toast的使用稍微封装一下，偷一下懒。代码如下：

public class ToastUtil { public static Toast toast; public static void showMsg(Context context,String msg){ if(toast==null){ toast=Toast.makeText(context,msg,Toast.LENGTH_LONG); }else{ toast.setText(msg); } toast.show(); } }

如果还有问题，欢迎告诉我哦~