来源: 互联网  发布时间: 2014-02-18

判断一个字符串是否为IP地址

    private boolean isIpAddress(String value) {
       
        int start = 0;
        int end = value.indexOf('.');
        int numBlocks = 0;
       
        while (start < value.length()) {
           
            if (end == -1) {
                end = value.length();
            }

            try {
                int block = Integer.parseInt(value.substring(start, end));
                if ((block > 255) || (block < 0)) {
                    return false;
                }
            } catch (NumberFormatException e) {
                return false;
            }
           
            numBlocks++;
           
            start = end + 1;
            end = value.indexOf('.', start);
        }
       
        return numBlocks == 4;
    }

    

    来源: 互联网  发布时间: 2014-02-18

Activity切换动画效果的修改
Activity的动画效果在\android\frameworks\base\core\res\res\values下的stlyes.xml,themes.xml两个文件中有定义。
但是有时这些效果未必能满足你的要求，需要自己定义styles.xml来实现这个功能。

Activity去掉默认的动画效果方法：
1.重写Activity的Them中的windowAnimationStyle相关属性，并保存在res/values/styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="Theme" parent="android:Theme">

        <item name="android:windowAnimationStyle">@style/Animation</item>

    </style>
    <style name="Animation">

        <item name="android:activityOpenEnterAnimation">@null</item>

        <item name="android:activityOpenExitAnimation">@null</item>

        <item name="android:activityCloseEnterAnimation">@null</item>

        <item name="android:activityCloseExitAnimation">@null</item>

        <item name="android:taskOpenEnterAnimation">@null</item>

        <item name="android:taskOpenExitAnimation">@null</item>

        <item name="android:taskCloseEnterAnimation">@null</item>

        <item name="android:taskCloseExitAnimation">@null</item>

        <item name="android:taskToFrontEnterAnimation">@null</item>

        <item name="android:taskToFrontExitAnimation">@null</item>

        <item name="android:taskToBackEnterAnimation">@null</item>

        <item name="android:taskToBackExitAnimation">@null</item>

    </style>
</resources>

2.在不想有动画的Activity上设置此属性即可

<activity android:name=".yourActivity"
            android:label="@string/app_name"
            android:screenOrientation="nosensor"
            android:theme="@style/Theme">

    

    来源: 互联网  发布时间: 2014-02-18

显示已安装的分享软件
1. Intent intent = new Intent();
            intent.setAction(Intent.ACTION_SEND);
intent.setType("image/*");
            try {
                startActivity(Intent.createChooser(
                        intent, getText(R.string.send_media_files)));
            } catch (android.content.ActivityNotFoundException ex) {
                Toast.makeText(this, R.string.no_way_to_share,
                        Toast.LENGTH_SHORT).show();
            }
2.如果想自己做为分享应用可以在manifest.xml中添加
<intent-filter>
<action android:name="android.intent.action.SEND" />
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="image/*" />
</intent-filter>