AlanGinger

import kotlinx.coroutines.*

val myData by lazy(LazyThreadSafetyMode.NONE) {
    loadDataFromNetwork()
}

suspend fun loadDataFromNetwork(): MyData {
    // 模拟网络请求
    delay(1000)
    return MyData(/* ... */)

AlanGinger

fun countDownCoroutines(
        total: Int,
        scope: CoroutineScope,
        onTick: (Int) -> Unit,
        onStart: (() -> Unit)? = null,
        onFinish: (() -> Unit)? = null,
): Job {
    return flow {
        for (i in total downTo 0) {
            emit(i)

AlanGinger

public static <T extends ApiResponse> Observable<T> CallToObservable(Call<T> originalCall) {
        return Observable.<T>create(subscriber -> {
            Call<T> call = originalCall.clone();
            CallArbiter<T> arbiter = new CallArbiter<>(call, subscriber);
            subscriber.add(arbiter);
            subscriber.setProducer(arbiter);
            Response<T> response;
            try {
                response = call.execute();
                if (!response.isSuccessful()) {

AlanGinger

public class DisableableAppBarLayoutBehavior extends AppBarLayout.Behavior {
    private boolean mEnabled;

    public DisableableAppBarLayoutBehavior() {
        super();
    }

    public DisableableAppBarLayoutBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

AlanGinger

public static class ExampleViewHolder extends RecyclerView.ViewHolder 
    implements View.OnClickListener {

    private int originalHeight = 0;
    private boolean isViewExpanded = false;
    private YourCustomView yourCustomView
    
    public ExampleViewHolder(View v) {
     super(v);
     v.setOnClickListener(this);

AlanGinger

@IntDef({Status.IDLE, Status.PROCESSING, Status.DONE, Status.CANCELLED})
@Retention(RetentionPolicy.SOURCE)
@interface Status {
    int IDLE = 0;
    int PROCESSING = 1;
    int DONE = 2;
    int CANCELLED = 3;
}

AlanGinger

System directories

Method	Result
Environment.getDataDirectory()	/data
Environment.getDownloadCacheDirectory()	/cache
Environment.getRootDirectory()	/system

External storage directories

AlanGinger

public class ReactiveAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    String[] mDataset = { "Data", "In", "Adapter" };

    private final PublishSubject<String> onClickSubject = PublishSubject.create();

    @Override 
    public void onBindViewHolder(final ViewHolder holder, int position) {
        final String element = mDataset[position];

        holder.itemView.setOnClickListener(new View.OnClickListener() {