针对android–从其他应用程序打开Twitter应用程序并加载一些页面和安卓打开推特这两个问题，本篇文章进行了详细的解答，同时本文还将给你拓展Android4.x.通过apk部署本机库并从其他应用

针对android – 从其他应用程序打开Twitter应用程序并加载一些页面和安卓打开推特这两个问题，本篇文章进行了详细的解答，同时本文还将给你拓展Android 4.x.通过apk部署本机库并从其他应用程序加载、Android Twitter应用程序开发和TextView和Linkify的使用、android – Facebook和Twitter应用程序的快捷方式发布页面、android – Flutter应用程序页面不断重建等相关知识，希望可以帮助到你。

• android – 从其他应用程序打开Twitter应用程序并加载一些页面（安卓打开推特）
• Android 4.x.通过apk部署本机库并从其他应用程序加载
• Android Twitter应用程序开发和TextView和Linkify的使用
• android – Facebook和Twitter应用程序的快捷方式发布页面
• android – Flutter应用程序页面不断重建

android – 从其他应用程序打开Twitter应用程序并加载一些页面（安卓打开推特）

try{
            Intent intent = new Intent(Intent.ACTION_SEND);
            intent.putExtra(Intent.EXTRA_TEXT,"this is a tweet");
            intent.setType("text/plain");
            final PackageManager pm = getPackageManager();
            final List<?> activityList = pm.queryIntentActivities(intent,0);
            int len =  activityList.size();
            for (int i = 0; i < len; i++) {
                final ResolveInfo app = (ResolveInfo) activityList.get(i);
                if ("com.twitter.android.PostActivity".equals(app.activityInfo.name)) {
                    final ActivityInfo activity=app.activityInfo;
                    final ComponentName name=new ComponentName(activity.applicationInfo.packageName,activity.name);
                    intent.addCategory(Intent.CATEGORY_LAUNCHER);
                    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
                    intent.setComponent(name);
                    startActivity(intent);
                    break;
                }
            }
      }
        catch(final ActivityNotFoundException e) {
            Log.i("twitter","no twitter native",e );
        }

Android 4.x.通过apk部署本机库并从其他应用程序加载

System.load(path_to_lib);

Android Twitter应用程序开发和TextView和Linkify的使用

android – Facebook和Twitter应用程序的快捷方式发布页面

Intent fbIntent = new Intent(Intent.ACTION_SEND);
fbIntent.setType("text/plain"); 
fbIntent.setFlags(0x3000000);   
fbIntent.setComponent(new ComponentName("com.facebook.katana",".ShareLinkActivity"));
fbIntent.putExtra(Intent.EXTRA_TEXT,getString(R.string.share_text));
startActivity(fbIntent);

Intent twitterIntent = new Intent(Intent.ACTION_VIEW);
twitterIntent.setAction("android.intent.action.SEND");
twitterIntent.setFlags(0x3000000);                  
twitterIntent.setType("text/plain");    
twitterIntent.setComponent(new ComponentName("com.twitter.android",".PostActivity"));
twitterIntent.putExtra(Intent.EXTRA_TEXT,getString(R.string.share_text));
startActivity(twitterIntent);

intent.setClassName("com.facebook.katana","com.facebook.katana.ShareLinkActivity");

intent.setClassName("com.twitter.android","com.twitter.android.composer.ComposerActivity");

android – Flutter应用程序页面不断重建

我正在开发一个Flutter应用程序,它会提示表单询问一些个人信息.

问题是每次发生某些事情时都会重建页面,例如屏幕方向改变或文本字段获得焦点时(键盘会立即显示并消失,从而阻止用户输入任何内容).

显然有些事情正在触发不必要的重建,但我无法找到什么和哪里.

当我将此页面作为主页插入时,一切正常.
当我在启动画面上显示动画后将页面插入其预期位置时会出现问题,所以我想这与我的问题有关.

主要课程：

import 'package:Flutter/material.dart';
import './view/SplashScreen.dart';

void main() => runApp(new MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new SplashScreen(),
    );
  }
}

启动画面：

import 'package:Flutter/material.dart';
import 'dart:async';
import './UserLoader.dart';

class SplashScreen extends StatefulWidget {
  @override
  _SplashScreenState createState() => new _SplashScreenState();
}

class _SplashScreenState extends State<SplashScreen>
    with SingleTickerProviderStateMixin {
  AnimationController _iconAnimationController;
  CurvedAnimation _iconAnimation;

  @override
  void initState() {
    super.initState();

    _iconAnimationController = new AnimationController(
        vsync: this, duration: new Duration(milliseconds: 2000));

    _iconAnimation = new CurvedAnimation(
        parent: _iconAnimationController, curve: Curves.easeIn);
    _iconAnimation.addListener(() => this.setState(() {}));

    _iconAnimationController.forward();

    startTimeout();
  }

  @override
  Widget build(BuildContext context) {
    return new Material(
      color: Colors.white,
      child: new InkWell(
        child: new Center(
          child: new Container(
            width: 275.0,
            height: 275.0,
            decoration: new Boxdecoration(
              image: new decorationImage(
                  colorFilter: new ColorFilter.mode(
                      Colors.white.withOpacity(_iconAnimation.value),
                      BlendMode.dstATop),
                  image: new Assetimage("images/logo.png")),
            ),
          ),
        ),
      ),
    );
  }

  void handleTimeout() {
    Navigator.of(context).pushReplacement(new MaterialPageRoute(
        builder: (BuildContext context) => new UserLoader()));
  }

  startTimeout() async {
    var duration = const Duration(seconds: 3);
    return new Timer(duration, handleTimeout);
  }
}

页面错误：

import 'package:Flutter/material.dart';

class UserLoader extends StatefulWidget {
  @override
  _UserLoaderState createState() => new _UserLoaderState();
}

class _UserLoaderState extends State<UserLoader> {
  @override
  Widget build(BuildContext context) {
    final _formKey = new GlobalKey<FormState>();
    final _emailController = new TextEditingController();

    return new Scaffold(
        appBar: new AppBar(
          title: new Text("informations"),
          actions: <Widget>[
            new IconButton(
                icon: const Icon(Icons.save),
                onpressed: () {
                  // unrelated stuff happens here
                })
          ],
        ),
        body: new Center(
          child: new SingleChildScrollView(
              child: new Form(
                  key: _formKey,
                  child: new Column(children: <Widget>[
                    new ListTile(
                      leading: const Icon(Icons.email),
                      title: new TextFormField(
                        decoration: new Inputdecoration(
                          hintText: "Email",
                        ),
                        keyboardType: TextInputType.emailAddress,
                        controller: _emailController,
                        validator: _validateEmail,
                      ),
                    ),
                  ]))),
        ));
    }}

任何人都可以帮我找出为什么页面不断重建自己？

解决方法:

我通过简单地更改类来解决问题：

import 'package:Flutter/material.dart';

class UserLoader extends StatefulWidget {
  @override
  _UserLoaderState createState() => new _UserLoaderState();
}

class _UserLoaderState extends State<UserLoader> {
  Widget _form; // Save the form

  @override
  Widget build(BuildContext context) {
    if (_form == null) { // Create the form if it does not exist
      _form = _createForm(context); // Build the form
    }
    return _form; // Show the form in the application
  }

  Widget _createForm(BuildContext context) {
    // This is the exact content of the build method in the question

    final _formKey = new GlobalKey<FormState>();
    final _emailController = new TextEditingController();

    return new Scaffold(
        appBar: new AppBar(
          title: new Text("informations"),
          actions: <Widget>[
            new IconButton(
                icon: const Icon(Icons.save),
                onpressed: () {
                  // unrelated stuff happens here
                })
          ],
        ),
        body: new Center(
          child: new SingleChildScrollView(
              child: new Form(
                  key: _formKey,
                  child: new Column(children: <Widget>[
                    new ListTile(
                      leading: const Icon(Icons.email),
                      title: new TextFormField(
                        decoration: new Inputdecoration(
                          hintText: "Email",
                        ),
                        keyboardType: TextInputType.emailAddress,
                        controller: _emailController,
                        validator: _validateEmail,
                      ),
                    ),
                  ]))),
        ));
    }
  }
}

希望有一天这可能会帮助别人.

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