如何在安卓中创建自定义 AlertDialog

原文:https://www . geeksforgeeks . org/如何在安卓中创建自定义 alertdialog/

有时在 AlertDialog 中，需要得到用户的输入或者根据我们的要求进行定制。所以我们创建了自定义警报日志。这篇文章将展示如何定制警报对话框并从中获取输入。

下面是上述方法的逐步实现:

• 步骤 1: 创建一个 XML 文件: custom_layout.xml 。在 custom_layout.xml 中添加以下代码。该代码定义 alertdialog 框尺寸，并在其中添加一个 edittext 。

  ```java <?xml version="1.0" encoding="utf-8"?>

  EditText     android:id="@+id/editText"     android:layout_width="match_parent"     android:layout_height="wrap_content"/ ```

• 第二步:在 activity_main.xml 中增加一个按钮。单击该按钮将显示警报对话框。

  ```java <?xml version="1.0" encoding="utf-8"?> LinearLayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:gravity="center"     android:id="@+id/root"     android:orientation="vertical"     tools:context=".MainActivity"

  ```

• Step 3:

  在您想要在此显示自定义警报对话框的活动中添加 custom_layout.xml ，它是在 MainActivity.java 添加的。

  ```java public class MainActivity     extends AppCompatActivity {

  @Override     protected void onCreate(         Bundle savedInstanceState)     {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);     }

  public void showAlertDialogButtonClicked(View view)     {

  // Create an alert builder         AlertDialog.Builder builder             = new AlertDialog.Builder(this);         builder.setTitle("Name");

  // set the custom layout         final View customLayout             = getLayoutInflater()                   .inflate(                       R.layout.custom_layout,                       null);         builder.setView(customLayout);

  // add a button         builder             .setPositiveButton(                 "OK",                 new DialogInterface.OnClickListener() {

  @Override                     public void onClick(                         DialogInterface dialog,                         int which)                     {

  // send data from the                         // AlertDialog to the Activity                         EditText editText                             = customLayout                                   .findViewById(                                       R.id.editText);                         sendDialogDataToActivity(                             editText                                 .getText()                                 .toString());                     }                 });

  // create and show         // the alert dialog         AlertDialog dialog             = builder.create();         dialog.show();     }

  // Do something with the data     // coming from the AlertDialog     private void sendDialogDataToActivity(String data)     {         Toast.makeText(this,                        data,                        Toast.LENGTH_SHORT)             .show();     } } ```

输出:

[https://media.geeksforgeeks.org/wp-content/cdn-uploads/20200601161357/Custom-AlertDialog-in-Android.mp4](https://media.geeksforgeeks.org/wp-content/cdn-uploads/20200601161357/Custom-AlertDialog-in-Android.mp4)

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