The most scientific writing usage of the four dialog boxes of alertdialog in Android (example code)

First, let's look at the figure above:

The XML code is as follows, which is used to write buttons:

<?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>

The Java code is as follows to implement the logic:

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};
  // 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","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,"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,int which) {
            index = which;
          }
        });
        builder.setPositiveButton("确定","选择了"+item[index],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",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(),null);
        AlertDialog alertDialog = builder.create();
        alertDialog.show();
      }
    });
  }
}

summary

The above is the most scientific writing usage of the four dialog boxes of alertdialog in Android introduced by Xiaobian. I hope it will be helpful to you. If you have any questions, please leave me a message and Xiaobian will reply to you in time. Thank you very much for your support to our website! If you think this article is helpful to you, welcome to reprint, please indicate the source, thank you!