我正在嘗試在我的 Android 應(yīng)用程序中設(shè)置 Room。我收到此錯(cuò)誤，但我真的不明白為什么。完全錯(cuò)誤：實(shí)體和 Pojos 必須有一個(gè)可用的公共構(gòu)造函數(shù)。您可以有一個(gè)空的構(gòu)造函數(shù)或參數(shù)與字段匹配的構(gòu)造函數(shù)（按名稱和類型）。我正在使用 1.1.1 版的 Room。我嘗試了空構(gòu)造函數(shù)、帶參數(shù)的構(gòu)造函數(shù)，還修復(fù)了我遇到的所有警告，這樣就沒(méi)有其他問(wèn)題了。這是我的實(shí)體：標(biāo)記實(shí)體@Entity(tableName = "markers")public class Marker {    public Marker(@Nullable String title, @Nullable String snippet, String latitude, String longitude, float color) {        this.title = title;        this.snippet = snippet;        this.latitude = latitude;        this.longitude = longitude;        this.color = color;    }    @PrimaryKey(autoGenerate = true)    private int id;    private String title;    private String snippet;    private String latitude;    private String longitude;    private float color;    /* Getters and setters */}照片實(shí)體@Entity(tableName = "photos",        foreignKeys = @ForeignKey(entity = Marker.class,                                  parentColumns = "id",                                  childColumns = "marker_id"),        indices = {@Index("marker_id")})public class Photo {    public Photo(String imageBase64, int markerId) {        this.imageBase64 = imageBase64;        this.markerId = markerId;    }    @PrimaryKey(autoGenerate = true)    private int id;    @ColumnInfo(name = "image")    private String imageBase64;    @ColumnInfo(name = "marker_id")    private int markerId;    /* Getters and setters */}網(wǎng)絡(luò)實(shí)體@Entity(tableName = "networks",        foreignKeys = @ForeignKey(entity = Marker.class,                                  parentColumns = "id",                                  childColumns = "marker_id"),        indices = {@Index("marker_id")})public class Network {    public Network(String ssid, String bssid, String capabilities, long timestamp, int markerId) {        this.ssid = ssid;        this.bssid = bssid;        this.capabilities = capabilities;        this.timestamp = timestamp;        this.markerId = markerId;    }}我看了很多這樣的問(wèn)題，但沒(méi)有一個(gè)能解決我的問(wèn)題。