1. Ouvrez la page Web
Uri uri = Uri.parse("http://www.php.cn"); Intent it = new Intent(Intent.ACTION_VIEW, uri); startActivity(it);
2. Obtenez le contenu de la page Web
public String posturl(String url){ InputStream is = null; String result = ""; try{ HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost(url); HttpResponse response = httpclient.execute(httppost); HttpEntity entity = response.getEntity(); is = entity.getContent(); }catch(Exception e){ return "Fail to establish http connection!"+e.toString(); } try{ BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf-8")); StringBuilder sb = new StringBuilder(); String line = null; while ((line = reader.readLine()) != null) { sb.append(line + "\n"); } is.close(); result=sb.toString(); }catch(Exception e){ return "Fail to convert net stream!"; } return result; }
3. >
4. Autoriser l'accès au réseau
textView1.setText(Html.fromHtml("<a href='http://www.php.cn'>php中文网 </a>")); textView1.setMovementMethod(LinkMovementMethod.getInstance());
5.
<uses-permission android:name="android.permission.INTERNET" />
6. Boîtes de dialogue de confirmation et d'annulation
new AlertDialog.Builder(this) .setTitle("标题") .setMessage("简单消息框") .setPositiveButton("确定", null) .show();
7. Boîte de dialogue avec zone de saisie
new AlertDialog.Builder(this) .setTitle("确认") .setMessage("确定吗?") .setPositiveButton("是", null) .setNegativeButton("否", null) .show();
8. Boîte de dialogue avec boutons radio
new AlertDialog.Builder(this) .setTitle("请输入") .setIcon(android.R.drawable.ic_dialog_info) .setView(new EditText(this)) .setPositiveButton("确定", null) .setNegativeButton("取消", null) .show();
new AlertDialog.Builder(this) .setTitle("请选择") .setIcon(android.R.drawable.ic_dialog_info) .setSingleChoiceItems(new String[] {"选项1","选项2","选项3","选项4"}, 0, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } } ) .setNegativeButton("取消", null) .show();
10. Boîte de dialogue avec zone de liste
new AlertDialog.Builder(this) .setTitle("多选框") .setMultiChoiceItems(new String[] {"选项1","选项2","选项3","选项4"}, null, null) .setPositiveButton("确定", null) .setNegativeButton("取消", null) .show();
11. Cadre photo
new AlertDialog.Builder(this) .setTitle("列表框") .setItems(new String[] {"列表项1","列表项2","列表项3"}, null) .setNegativeButton("确定", null) .show();
ImageView img = new ImageView(this); img.setImageResource(R.drawable.ic_launcher); new AlertDialog.Builder(this) .setTitle("图片框") .setView(img) .setPositiveButton("确定", null) .show();
public void alert(String txt){ Toast.makeText(MainActivity.this,txt, 1).show(); }
14. Décodage d'URL
public String urlencode(String str) throws UnsupportedEncodingException{ return java.net.URLEncoder.encode(str, "utf-8"); }
public String urldecode(String str) throws UnsupportedEncodingException{ return java.net.URLDecoder.decode(str, "utf-8"); }
16. Afficher les images du réseau
//得到二进制数据 public String getDatas(String path) throws Exception{ // 类 URL 代表一个统一资源定位符,它是指向互联网“资源”的指针。 URL url = new URL(path); // 每个 HttpURLConnection 实例都可用于生成单个请求, //但是其他实例可以透明地共享连接到 HTTP 服务器的基础网络 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); //设置 URL 请求的方法 conn.setRequestMethod("GET"); //设置一个指定的超时值(以毫秒为单位), //该值将在打开到此 URLConnection 引用的资源的通信链接时使用。 conn.setConnectTimeout(5 * 1000); // conn.getInputStream()返回从此打开的连接读取的输入流 InputStream inStream = conn.getInputStream();// 通过输入流获取html数据 byte[] data = readInputStream(inStream);// 得到html的二进制数据 String html = new String(data); return html; } //读取输入流中的数据,返回字节数组byte[] public byte[] readInputStream(InputStream inStream) throws Exception{ //此类实现了一个输出流,其中的数据被写入一个 byte 数组 ByteArrayOutputStream outStream = new ByteArrayOutputStream(); // 字节数组 byte[] buffer = new byte[1024]; int len = 0; //从输入流中读取一定数量的字节,并将其存储在缓冲区数组buffer 中 while ((len = inStream.read(buffer)) != -1) { // 将指定 byte 数组中从偏移量 off 开始的 len 个字节写入此输出流 outStream.write(buffer, 0, len); } inStream.close(); //toByteArray()创建一个新分配的 byte 数组。 return outStream.toByteArray(); }
public Bitmap returnBitMap(String url) { URL myFileUrl = null; Bitmap bitmap = null; try { myFileUrl = new URL(url); } catch (MalformedURLException e) { e.printStackTrace(); } try { HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection(); conn.setDoInput(true); conn.connect(); InputStream is = conn.getInputStream(); bitmap = BitmapFactory.decodeStream(is); is.close(); } catch (IOException e) { e.printStackTrace(); } return bitmap; } ImageView imView = (ImageView) findViewById(R.id.pic1); imView.setImageBitmap(returnBitMap("https://img.php.cn/upload/course/000/001/120/595af5fa9f34f845.png"));
18. Événement d'écoute de dialogue
//登录检测 Button button=(Button)findViewById(R.id.button1); button.setOnClickListener(new OnClickListener(){ public void onClick(View v){ } }); //登录检测
19. Procédure de sortie Android
new AlertDialog.Builder(this) .setTitle("亲,是否退出?") .setPositiveButton("确定", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface arg0, int arg1) { // TODO Auto-generated method stub alert("你点了确定"); }}) .setNegativeButton("取消",new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // TODO Auto-generated method stub alert("你已经取消了"); }}) .show(); public void alert(String txt){ Toast.makeText(this,txt, 1).show(); }
20. Composant Android WebView
private void showTips() { AlertDialog alertDialog = new AlertDialog.Builder(this) .setTitle("退出程序").setMessage("是否退出程序") .setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { finish(); } }).setNegativeButton("取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { return; } }).create(); // 创建对话框 alertDialog.show(); // 显示对话框 } public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) { showTips(); return false; } return super.onKeyDown(keyCode, event); }
WebView mWebView = new WebView(this); mWebView.setWebViewClient(new webViewClient());//调用自身打开 mWebView.getSettings().setJavaScriptEnabled(true); mWebView.loadUrl("http://www.php.cn/member/1.html"); setContentView(mWebView); class webViewClient extends WebViewClient{ //重写shouldOverrideUrlLoading方法,使点击链接后不使用其他的浏览器打开。 @Override public boolean shouldOverrideUrlLoading(WebView view, String url) { view.loadUrl(url); //如果不需要其他对点击链接事件的处理返回true,否则返回false return true; } }
22. Transmettez les données à l'activité suivante (en utilisant Bundle et Intent.putExtras)
Intent it = new Intent(Activity.Main.this, Activity2.class); startActivity(it);
Pour l'acquisition de données, vous pouvez utiliser :
Intent it = new Intent(Activity.Main.this, Activity2.class); Bundle bundle=new Bundle(); bundle.putString("name", "This is from MainActivity!"); it.putExtras(bundle); // it.putExtra(“test”, "shuju”); startActivity(it); // startActivityForResult(it,REQUEST_CODE);
23. Renvoie le résultat à l'activité précédente (en utilisant setResult, pour l'activité démarrée par startActivityForResult(it, REQUEST_CODE))
Bundle bundle=getIntent().getExtras(); String name=bundle.getString("name");
24. Rappelez la fonction de traitement des résultats de l'activité précédente (onActivityResult)
Intent intent=getIntent(); Bundle bundle2=new Bundle(); bundle2.putString("name", "This is from ShowMsg!"); intent.putExtras(bundle2); setResult(RESULT_OK, intent);
25. Android
@Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); if (requestCode==REQUEST_CODE){ if(resultCode==RESULT_CANCELED) setTitle("cancle"); else if (resultCode==RESULT_OK) { String temp=null; Bundle bundle=data.getExtras(); if(bundle!=null) temp=bundle.getString("name"); setTitle(temp); } } }
26. Insérer une musique de fond pour Android
Timer timer = new Timer(); timer.schedule(task,10000,2000); TimerTask task = new TimerTask(){ public void run() { Message message = new Message(); message.what = 1; handler.sendMessage(message); } }; Handler handler = new Handler(){ public void handleMessage(Message msg) { switch (msg.what) { case 1: alert("hear me?"); break; } super.handleMessage(msg); } };
27. Conversion entre int et string
MediaPlayer mediaPlayer = new MediaPlayer(); Uri uri = Uri .parse("http://www.php.cn/asset/1.mp3"); try { mediaPlayer.setDataSource(Sound.this, uri); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { mediaPlayer.prepare(); } catch (IllegalStateException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } mediaPlayer.start();
1 Comment convertir String en entier
A Il existe deux méthodes :
1). ([String]); ou
i = Integer.parseInt([String],[int radix]);
2) int i = Integer.valueOf(my_str).intValue( ; Méthodes :
1.) String s = String.valueOf(i);
2.) String s = Integer.toString(i);
3.) String s = "" + i;
Remarque : les méthodes de conversion de Double, Float et Long en chaînes sont similaires.
28. Obtenez la largeur et la hauteur de l'écran
29. Glissement d'image
30. Code d'invite du message de notification de la barre d'état
DisplayMetrics dm = getResources().getDisplayMetrics(); int screenWidth = dm.widthPixels; int screenHeight = dm.heightPixels - 50;
31. Code de la couche contextuelle Android [fenêtre contextuelle]
private int screenWidth; private int screenHeight; private ImageView img1; private ImageView img2; img1 = (ImageView) findViewById(R.id.imageView1); img2 = (ImageView) findViewById(R.id.imageView2); DisplayMetrics dm = getResources().getDisplayMetrics(); screenWidth = dm.widthPixels; screenHeight = dm.heightPixels - 50; img1.setOnTouchListener(movingEventListener); img2.setOnTouchListener(movingEventListener); private OnTouchListener movingEventListener = new OnTouchListener() { int lastX, lastY; @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: int dx = (int) event.getRawX() - lastX; int dy = (int) event.getRawY() - lastY; int left = v.getLeft() + dx; int top = v.getTop() + dy; int right = v.getRight() + dx; int bottom = v.getBottom() + dy; // 设置不能出界 if (left < 0) { left = 0; right = left + v.getWidth(); } if (right > screenWidth) { right = screenWidth; left = right - v.getWidth(); } if (top < 0) { top = 0; bottom = top + v.getHeight(); } if (bottom > screenHeight) { bottom = screenHeight; top = bottom - v.getHeight(); } v.layout(left, top, right, bottom); lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); break; case MotionEvent.ACTION_UP: break; } return true; } };
32. Android obtient l'objet de vue via le nouveau fichier de mise en page XML
private void addNotificaction(int id) { NotificationManager manager = (NotificationManager) this .getSystemService(Context.NOTIFICATION_SERVICE); // 创建一个Notification Notification notification = new Notification(); // 设置显示在手机最上边的状态栏的图标 notification.icon = R.drawable.ic_launcher; // 当当前的notification被放到状态栏上的时候,提示内容 notification.tickerText = "注意了,我被扔到状态栏了"; // 添加声音提示 notification.defaults=Notification.DEFAULT_SOUND; // audioStreamType的值必须AudioManager中的值,代表着响铃的模式 notification.audioStreamType= android.media.AudioManager.ADJUST_LOWER; //下边的两个方式可以添加音乐 //notification.sound = Uri.parse("http://www.php.cn/asset/1.mp3"); //notification.sound = Uri.withAppendedPath(Audio.Media.INTERNAL_CONTENT_URI, "6"); Intent intent = new Intent(this, functions.class); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_ONE_SHOT); // 点击状态栏的图标出现的提示信息设置 notification.setLatestEventInfo(this, "内容提示:", "我就是一个测试文件", pendingIntent); manager.notify(id, notification); }
private void showPopUp(View v) { LinearLayout layout = new LinearLayout(this); layout.setBackgroundColor(Color.GRAY); TextView tv = new TextView(this); tv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)); tv.setText("I'm a pop -----------------------------!"); tv.setTextColor(Color.WHITE); layout.addView(tv); PopupWindow popupWindow = new PopupWindow(layout,120,120); popupWindow.setFocusable(true); popupWindow.setOutsideTouchable(true); popupWindow.setBackgroundDrawable(new BitmapDrawable()); int[] location = new int[2]; v.getLocationOnScreen(location); popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0], location[1]-popupWindow.getHeight()); } showPopUp(LayoutInflater.from(getBaseContext()).inflate(R.layout.popview, null));
LayoutInflater.from(getBaseContext()).inflate(R.layout.popview, null);
Veuillez ne pas réimprimer~~~
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
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