namchuai

public static int getApproxXToCenterText(String text, Typeface typeface, int fontSize, int widthToFitStringInto) {
    Paint p = new Paint();
    p.setTypeface(typeface);
    p.setTextSize(fontSize);
    float textWidth = p.measureText(text);
    int xOffset = (int)((widthToFitStringInto-textWidth)/2f) - (int)(fontSize/2f);
    return xOffset;
}

namchuai

import 'dart:io' show Platform;
...
    var horizontalTitleAlignment = Platform.isIOS
        ? CrossAxisAlignment.center
        : CrossAxisAlignment.start;

namchuai

final todos = List<Todo>.generate(
  20,
  (i) => Todo(
        'Todo $i',
        'A description of what needs to be done for Todo $i',
      ),
);

namchuai

<?xml version="1.0" encoding="utf-8"?>

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval"
    android:useLevel="false" >
    <solid android:color="@android:color/white" />
    <size
        android:height="50dp"
        android:width="50dp" />
</shape>

namchuai

public class MyWaitNotify {
    String myMonitorObject = "";
    boolean wasSignalled = false;

    public void doWait() {
        synchronized (myMonitorObject) {
            
            while(!wasSignalled) {
            try {
                myMonitorObject.wait();

namchuai

public class MyWaitNotify3 {
    MonitorObject myMonitorObject = new MonitorObject();
    boolean wasSignalled = false;

    public void doWait() {
        synchronized (myMonitorObject) {
        while (!wasSignalled) {
            try {
                myMonitorObject.wait();
            } catch (InterruptedException e) {

namchuai

public class MyWaitNotify2 {
    MonitorObject myMonitorObject = new MonitorObject();
    boolean wasSignalled = false;

    public void doWait() {
        synchronized (myMonitorObject) {
        if (!wasSignalled) {

        try {
            myMonitorObject.wait();

namchuai

public class MonitorObject {
}

public class MyWaitNotify {
    MonitorObject myMonitorObject = new MonitorObject();

    public void doWait() {
        synchronized(myMonitorObject) {
        try {
            myMonitor.wait();

namchuai

protected MySignal sharedSignal = …

while (!sharedSignal.hasDataToProcess()) {
    // do nothing… busy waiting
}

namchuai

public class MySignal {
    protected boolean hasDataToProcess = false;

    public synchronized boolean hasDataToProcess() {
        return this.hasDataToProcess;
    }

    public synchronized void setHasDataToProcess(boolean hasData) {
        this.hasDataToProcess = hasData;
    }