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:androandroid: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:    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="简单的dialog"    />  <Button    android:    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="列表的dialog"    />  <Button    android:    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="单选的dialog"    />  <Button    android:    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();      }    });  }}