Android开发中AlertDialog提示框的使用（超详细）

今天，统计记录一下AlertDialog提示框的常见用法：

1、标准提示框

2、下拉列表提示框

3、下拉单选框提示框

4、下拉多选框提示框

5、自定义提示框（重要）

效果如下：

activity_alertdialog.xml 布局文件如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <Button
        android:id="@+id/alertdialog_btnStandardAlertDialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="标准提示框"/>

    <Button
        android:id="@+id/alertdialog_btnListAlertDialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="下拉列表提示框"/>

    <Button
        android:id="@+id/alertdialog_btnRadioButtonListAlertDialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="下拉单选框提示框"/>

    <Button
        android:id="@+id/alertdialog_btnCheckBoxListAlertDialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="下拉多选框提示框"/>

    <Button
        android:id="@+id/alertdialog_btnCustomAlertDialog"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="自定义提示框"/>

</LinearLayout>

自定义提示框布局文件item_customalertdialog.xml如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="10dp"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="请输入用户名"
        android:inputType="textPersonName"
        android:textSize="14dp"
        android:layout_marginBottom="5dp"/>

    <EditText
        android:id="@+id/editText2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="请输入密码"
        android:textSize="14dp"
        android:inputType="textPassword" />
</LinearLayout>

AlertDialogDemo.java的代码如下：

public class AlertDialogDemo extends AppCompatActivity implements View.OnClickListener {

    public String[] cities = {"广州", "上海", "北京", "香港", "澳门"};
    public String toastText = "";
    public HashSet<String> hashSet;

    public Button btnStandardAlertDialog, btnListAlertDialog, btnRadioButtonListAlertDialog
            , btnCheckBoxListAlertDialog, btnCustomAlertDialog;

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

        componentInit();
        componentSetOnClickListener();
    }

    public void componentInit(){
        btnStandardAlertDialog = findViewById(R.id.alertdialog_btnStandardAlertDialog);
        btnListAlertDialog = findViewById(R.id.alertdialog_btnListAlertDialog);
        btnRadioButtonListAlertDialog = findViewById(R.id.alertdialog_btnRadioButtonListAlertDialog);
        btnCheckBoxListAlertDialog = findViewById(R.id.alertdialog_btnCheckBoxListAlertDialog);
        btnCustomAlertDialog = findViewById(R.id.alertdialog_btnCustomAlertDialog);
    }

    public void componentSetOnClickListener(){
        btnStandardAlertDialog.setOnClickListener(this);
        btnListAlertDialog.setOnClickListener(this);
        btnRadioButtonListAlertDialog.setOnClickListener(this);
        btnCheckBoxListAlertDialog.setOnClickListener(this);
        btnCustomAlertDialog.setOnClickListener(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.alertdialog_btnStandardAlertDialog:{
                AlertDialog.Builder builder = new AlertDialog.Builder(AlertDialogDemo.this);
                builder.setTitle("提示");
                builder.setIcon(R.drawable.ic_launcher_foreground);
                builder.setMessage("这是一个标准提示框！");
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
                builder.setNeutralButton("忽略", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
                builder.show();
                break;
            }
            case R.id.alertdialog_btnListAlertDialog:{
                AlertDialog.Builder builder = new AlertDialog.Builder(AlertDialogDemo.this);
                builder.setTitle("提示");
                builder.setIcon(R.mipmap.ic_launcher);
                builder.setItems(cities, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(AlertDialogDemo.this, cities[which], Toast.LENGTH_SHORT).show();
                    }
                });
                builder.show();
                break;
            }
            case R.id.alertdialog_btnRadioButtonListAlertDialog:{
                AlertDialog.Builder builder = new AlertDialog.Builder(AlertDialogDemo.this);
                builder.setTitle("提示");
                builder.setIcon(R.drawable.ic_launcher_foreground);
                builder.setSingleChoiceItems(cities, 0, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        toastText = cities[which];
                    }
                });
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(AlertDialogDemo.this, "您选择了：" + toastText, Toast.LENGTH_SHORT).show();
                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
                builder.show();
                break;
            }
            case R.id.alertdialog_btnCheckBoxListAlertDialog:{
                hashSet = new HashSet<>();
                AlertDialog.Builder builder = new AlertDialog.Builder(AlertDialogDemo.this);
                builder.setTitle("提示");
                builder.setIcon(R.drawable.ic_launcher_foreground);

                builder.setMultiChoiceItems(cities, null, new DialogInterface.OnMultiChoiceClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                        if (isChecked){
                            hashSet.add(cities[which]);
                        } else {
                            hashSet.remove(cities[which]);
                        }
                    }
                });
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        StringBuilder stringBuilder = new StringBuilder();
                        for (String str : hashSet){
                            stringBuilder.append(str);
                        }
                        Toast.makeText(AlertDialogDemo.this, "您选择了：" + String.valueOf(stringBuilder), Toast.LENGTH_SHORT).show();
                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
                builder.show();
                break;
            }
            case R.id.alertdialog_btnCustomAlertDialog:{
                AlertDialog.Builder builder = new AlertDialog.Builder(AlertDialogDemo.this);
                builder.setTitle("提示");
                builder.setIcon(R.drawable.ic_launcher_foreground);
                View view = LayoutInflater.from(this).inflate(R.layout.item_customalertdialog, null);
                builder.setView(view);
                final EditText etUserName = view.findViewById(R.id.editText);
                final EditText etPassword = view.findViewById(R.id.editText2);
                builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        String userName = etUserName.getText().toString().trim();
                        String Password = etPassword.getText().toString().trim();
                        Toast.makeText(AlertDialogDemo.this, "用户名：" + userName + "\r\n"
                                + "密码：" + Password, Toast.LENGTH_SHORT).show();
                    }
                });
                builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
                builder.show();
                break;
            }
        }

    }
}