Example code for blog post: Crashlytics and Android: Clean Way to Use Custom Crash Reports?

ErrorReport.java

/**
 * Attempt at generic non-fatal error report, modelled on Crashlytics error reporting methods.
 */
public class ErrorReport {

    private String id; // could be user ID, for instance
    private final Map<String, String> stateString;
    private final Map<String, Boolean> stateBool;
    private final Map<String, Integer> stateInt;
    private final Map<String, Double> stateDouble;
    private final Map<String, Float> stateFloat;
    private final List<String> messages;
    private Throwable exception;

    public ErrorReport() {
        stateString = new HashMap<>();
        stateBool = new HashMap<>();
        stateInt = new HashMap<>();
        stateDouble = new HashMap<>();
        stateFloat = new HashMap<>();
        messages = new ArrayList<>();
    }

    public Optional<String> getId() {
        return Optional.ofNullable(id);
    }

    public ErrorReport setId(String id) {
        this.id = id;
        return this;
    }

    public Map<String, String> getStateString() {
        return Collections.unmodifiableMap(stateString);
    }

    public Map<String, Boolean> getStateBool() {
        return Collections.unmodifiableMap(stateBool);
    }

    public Map<String, Integer> getStateInt() {
        return Collections.unmodifiableMap(stateInt);
    }

    public Map<String, Double> getStateDouble() {
        return Collections.unmodifiableMap(stateDouble);
    }

    public Map<String, Float> getStateFloat() {
        return Collections.unmodifiableMap(stateFloat);
    }

    public ErrorReport addState(String key, String value)
    {
        stateString.put(key, value);
        return this;
    }

    public ErrorReport addState(String key, Boolean value)
    {
        stateBool.put(key, value);
        return this;
    }

    public ErrorReport addState(String key, Integer value)
    {
        stateInt.put(key, value);
        return this;
    }

    public ErrorReport addState(String key, Double value)
    {
        stateDouble.put(key, value);
        return this;
    }

    public ErrorReport addState(String key, Float value)
    {
        stateFloat.put(key, value);
        return this;
    }

    public List<String> getMessages() {
        return Collections.unmodifiableList(messages);
    }

    public ErrorReport addMessage(String message)
    {
        messages.add(message);
        return this;
    }

    public ErrorReport setException(Throwable exception)
    {
        this.exception = exception;
        return this;
    }

    public Optional<Throwable> getException() {
        return Optional.ofNullable(exception);
    }
}