1.打开网页
Uri uri = Uri.parse("http://www.php.cn"); Intent it = new Intent(Intent.ACTION_VIEW, uri); startActivity(it);
2.获取网页内容
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.添加超链接
textView1.setText(Html.fromHtml("<a href='http://www.php.cn'> </a>"));textView1.setMovementMethod(LinkMovementMethod.getInstance());
4。允许访问网络
<uses-permission android:name="android.permission.INTERNET" />
5。简单的消息框
new AlertDialog.Builder(this) .setTitle("标题") .setMessage("简单消息框") .setPositiveButton("确定", null) .show();
6。确定与取消对话框
new AlertDialog.Builder(this) .setTitle("确认") .setMessage("确定吗？") .setPositiveButton("是", null) .setNegativeButton("否", null) .show();
7。带输入框的对话框
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();
8。带单选框的对话框
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();
9。带多选框的对话框
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();
10。带列表框的对话框
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();
11。图片框
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();
12。弹出短暂提示框
public void alert(String txt){ Toast.makeText(MainActivity.this,txt, 1).show(); }
13。网址转码
public String urlencode(String str) throws UnsupportedEncodingException{ return java.net.URLEncoder.encode(str, "utf-8"); }
14。网址解码
public String urldecode(String str) throws UnsupportedEncodingException{ return java.net.URLDecoder.decode(str, "utf-8"); }
15。获取网页源码
//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(); }
16。显示网络图片
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("http://img.php.cn/upload/course/000/001/120/595af5fa9f34f845.png"));
17。按钮点击事件
//登录检测 Button button=(Button)findViewById(R.id.button1); button.setOnClickListener(new OnClickListener(){ public void onClick(View v){ } }); //登录检测
18。对话框监听事件
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(); }
19。安卓退出程序
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); }
20。安卓WebView组件
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; } }
21。无参数Activity跳转
Intent it = new Intent(Activity.Main.this, Activity2.class);startActivity(it);
22。向下一个Activity传递数据（使用Bundle和Intent.putExtras）
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);
对于数据的获取可以采用：
Bundle bundle=getIntent().getExtras();String name=bundle.getString("name");
23。向上一个Activity返回结果（使用setResult，针对startActivityForResult(it,REQUEST_CODE)启动的Activity）
Intent intent=getIntent();Bundle bundle2=new Bundle();bundle2.putString("name", "This is from ShowMsg!");intent.putExtras(bundle2);setResult(RESULT_OK, intent);
24。回调上一个Activity的结果处理函数（onActivityResult）
@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); } } }
25。安卓定时器
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); } };
26。安卓插入背景音乐
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();
27。int与string互转1 如何将字串 String 转换成整数 int? A. 有两个方法:1). int i = Integer.parseInt([String]); 或 i = Integer.parseInt([String],[int radix]);2). int i = Integer.valueOf(my_str).intValue(); 注: 字串转成 Double, Float, Long 的方法大同小异. 2 如何将整数 int 转换成字串 String ? A. 有叁种方法:1.) String s = String.valueOf(i);2.) String s = Integer.toString(i); 3.) String s = "" + i; 注: Double, Float, Long 转成字串的方法大同小异.28。获取屏幕宽高
DisplayMetrics dm = getResources().getDisplayMetrics(); int screenWidth = dm.widthPixels; int screenHeight = dm.heightPixels - 50;
29。图片拖动
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; } };
30。状态栏通知消息提示代码
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); }
31。安卓弹出层【弹窗】代码
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));
32。 安卓通过新的xml布局文件获取view对象
LayoutInflater.from(getBaseContext()).inflate(R.layout.popview, null);
33。悬浮功能所需要的权限
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
34。添加悬浮按钮
权限 <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> WindowManager wm=(WindowManager)getApplicationContext().getSystemService("window"); WindowManager.LayoutParams wmParams = new WindowManager.LayoutParams(); wmParams.type=2002; //type是关键，这里的2002表示系统级窗口，你也可以试试2003。 wmParams.format=1; wmParams.flags=40; wmParams.width=40; wmParams.height=40; wm.addView(LayoutInflater.from(getBaseContext()).inflate(R.layout.popview, null), wmParams);//创建View
本文由用户“Ty80”提供，原文地址：http://www.php.cn/java-article-374028.html
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