How can we create iPhone-like spinners in android?
Default spinners on the iPhone look a lot better than on Androi开发者_运维知识库d. It looks like at least one Android app (UrbanSpoon) has been able to replicate this control, and it's awesome: http://www.urbanspoon.com/android
Anyone have any ideas on how to create this? Code would be helpful.
If you don't need support for the trackball, then all it will take is WebView along with some minor tweaks to some existing JavaScript that impersonates Apple's UIPickerView to create applications like this.
A majority of the hard work has been done by Matteo Spinelli so start by downloading his code and then apply these changes to spinningwheel.js. His code wants to pop up the picker from the bottom of the screen with cancel and done buttons so we need to modify a few lines to eliminate this behavior.
--- spinningwheel.js.orig 2010-05-26 00:17:00.411954051 -0700
+++ spinningwheel.js 2010-05-26 00:16:32.319010720 -0700
@@ -67,12 +67,10 @@
onOrientationChange: function (e) {
window.scrollTo(0, 0);
- this.swWrapper.style.top = window.innerHeight + window.pageYOffset + 'px';
this.calculateSlotsWidth();
},
onScroll: function (e) {
- this.swWrapper.style.top = window.innerHeight + window.pageYOffset + 'px';
},
lockScreen: function (e) {
@@ -113,9 +111,9 @@
// Create the Spinning Wheel main wrapper
div = document.createElement('div');
div.id = 'sw-wrapper';
- div.style.top = window.innerHeight + window.pageYOffset + 'px'; // Place the SW down the actual viewing screen
+ div.style.top = 0;
div.style.webkitTransitionProperty = '-webkit-transform';
- div.innerHTML = '<div id="sw-header"><div id="sw-cancel">Cancel</' + 'div><div id="sw-done">Done</' + 'div></' + 'div><div id="sw-slots-wrapper"><div id="sw-slots"></' + 'div></' + 'div><div id="sw-frame"></' + 'div>';
+ div.innerHTML = '<div id="sw-slots-wrapper"><div id="sw-slots"></' + 'div></' + 'div><div id="sw-frame"></' + 'div>';
document.body.appendChild(div);
@@ -164,8 +162,6 @@
window.addEventListener('scroll', this, true); // Reposition SW on page scroll
// Cancel/Done buttons events
- document.getElementById('sw-cancel').addEventListener('touchstart', this, false);
- document.getElementById('sw-done').addEventListener('touchstart', this, false);
// Add scrolling to the slots
this.swFrame.addEventListener('touchstart', this, false);
@@ -174,9 +170,6 @@
open: function () {
this.create();
- this.swWrapper.style.webkitTransitionTimingFunction = 'ease-out';
- this.swWrapper.style.webkitTransitionDuration = '400ms';
- this.swWrapper.style.webkitTransform = 'translate3d(0, -260px, 0)';
},
@@ -191,8 +184,6 @@
this.swFrame.removeEventListener('touchstart', this, false);
- document.getElementById('sw-cancel').removeEventListener('touchstart', this, false);
- document.getElementById('sw-done').removeEventListener('touchstart', this, false);
document.removeEventListener('touchstart', this, false);
document.removeEventListener('touchmove', this, false);
Additionally, the index.html he provides isn't exactly what you want so replace it with this one and then copy the html, css, js, and png files into the assets directory of your project.
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" href="spinningwheel.css" type="text/css" media="all" />
<script type="text/javascript" src="spinningwheel.js?v=1.4"></script>
<title></title>
<script type="text/javascript">
function getData() {
var results = SpinningWheel.getSelectedValues();
window.android.sendResults(results.values.join(' ') );
}
function notifyAndroid() {
window.android.readyForJavascript('');
}
</script>
</head>
<body onload="javascript:notifyAndroid()"></body>
</html>
Create an Activity that enables JavaScript in a WebView and has callbacks for it to return the selection.
public class FancySpinner extends Activity {
private WebView webView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
((Button) findViewById(R.id.GetSelectedTimeButton))
.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
webView.loadUrl("javascript:getData()");
}
});
webView = (WebView) findViewById(R.id.WebView01);
webView.getSettings().setJavaScriptEnabled(true);
webView.addJavascriptInterface(new AndroidBridge(), "android");
webView.setVerticalScrollBarEnabled(false);
webView.loadUrl("file:///android_asset/index.html");
}
private class AndroidBridge {
public void sendResults(final String arg) {
Toast.makeText(FancySpinner.this, arg, Toast.LENGTH_SHORT).show();
}
public void readyForJavascript(final String arg) {
webView.loadUrl("javascript:SpinningWheel.addSlot({ " +
"1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6," +
"7: 7, 8: 8, 9: 9, 10: 10, 11: 11, 12: 12 });");
webView.loadUrl("javascript:SpinningWheel.addSlot({ " +
"1: 'AM', 2: 'PM'});");
webView.loadUrl("javascript:SpinningWheel.open();");
}
}
}
Finally, modify your layout so has a WebView with its height set appropriately.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<WebView
android:id="@+id/WebView01"
android:background="#77CC0000"
android:layout_height="215dp"
android:layout_width="fill_parent"
android:focusable="false" />
<Button
android:text="Read Selected Time"
android:id="@+id/GetSelectedTimeButton"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
From the screenshot, it looks like it is just a list view with some special styling to make it look rounded. In terms of behavior, I don't think it would be any different from a ListView where the middle item is considered the selected value.
加载中,请稍侯......
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