Android开发小知识大全.doc

1、/* * 为程序创建桌面快捷方式*/privatevoid addShortcut()Intent shortcut = new Intent(“com.android.launcher.action.INSTALL_SHORTCUT“);/快捷方式的名称shortcut.putExtra(Intent.EXTRA_SHORTCUT_NAME, getString(R.string.app_name);shortcut.putExtra(“duplicate“, false); /不允许重复创建/指定当前的 Activity为快捷方式启动的对象: 如 /com.everest.video.Vi

2、deoPlayer/注意: ComponentName 的第二个参数必须加上点号(.)，否则快捷方式无法启动相应程序ComponentName comp = new ComponentName(this.getPackageName(), “.“+this.getLocalClassName();shortcut.putExtra(Intent.EXTRA_SHORTCUT_INTENT, new Intent(Intent.ACTION_MAIN).setComponent(comp);/快捷方式的图标ShortcutIconResource iconRes = Intent.Shortcu

3、tIconResource.fromContext(this, R.drawable.icon);shortcut.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, iconRes);sendBroadcast(shortcut);/* * 删除程序的快捷方式*/privatevoid delShortcut()Intent shortcut = new Intent(“com.android.launcher.action.UNINSTALL_SHORTCUT“);/快捷方式的名称shortcut.putExtra(Intent.EXTRA_SHOR

4、TCUT_NAME, getString(R.string.app_name);/指定当前的 Activity为快捷方式启动的对象: 如 /com.everest.video.VideoPlayer/注意: ComponentName 的第二个参数必须是完整的类名（包名+类名），否则无法删除快捷方式String appClass = this.getPackageName() + “.“ +this.getLocalClassName();ComponentName comp = new ComponentName(this.getPackageName(), appClass);shortc

5、ut.putExtra(Intent.EXTRA_SHORTCUT_INTENT, new Intent(Intent.ACTION_MAIN).setComponent(comp);sendBroadcast(shortcut);全屏显示this.requestWindowFeature(Window.FEATURE_NO_TITLE);this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);横竖屏显示privatevoid

6、 changedScreen()int request = this.getRequestedOrientation();if(request = -1)Toast.makeText(TaskRunActivity.this, “None 1“, Toast.LENGTH_SHORT).show();elseif(getRequestedOrientation() = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);e

7、lseif(getRequestedOrientation() = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT)this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);获取手机分辩率DisplayMetrics dm = new DisplayMetrics();this.getWindowManager().getDefaultDisplay().getMetrics(dm);int width = dm.widthPixels;int height = dm.hei

8、ghtPixels;图形用户界面文本框（TextView）列表（ListView）卷轴视图(ScrollView)编辑框(EditText)按钮(Button)下载列表(Spinner)多项选择(CheckBok)图形用户界面菜单(Menu)提示(toast)对话框(Dialog)日期(DatePicker)时间(TimePicker)单项选择(RadioGroup RadioButton)图形用户界面线性布局(LinearLayout)相对布局(RelativeLayout)绝对布局(AbsoluteLayout)表格布局(TableLayout)数据据存储系统偏好文件网络数据库显示网页:1

9、. Uri uri = Uri.parse(“http:/“);2. Intent it = new Intent(Intent.ACTION_VIEW,uri);3. startActivity(it);显示地图:1. Uri uri = Uri.parse(“geo:38.899533,-77.036476“);2. Intent it = new Intent(Intent.Action_VIEW,uri);3. startActivity(it);路径规划:1. Uri uri = Uri.parse(“http:/ Intent it = new Intent(Intent.ACTI

10、ON_VIEW,URI);3. startActivity(it);拨打电话:调用拨号程序1. Uri uri = Uri.parse(“tel:xxxxxx“);2. Intent it = new Intent(Intent.ACTION_DIAL, uri); 3. startActivity(it); 1. Uri uri = Uri.parse(“tel.xxxxxx“);2. Intent it =new Intent(Intent.ACTION_CALL,uri);3. 要使用这个必须在配置文件中加入发送 SMS/MMS调用发送短信的程序1. Intent it = new In

11、tent(Intent.ACTION_VIEW);2. it.putExtra(“sms_body“, “The SMS text“);3. it.setType(“vnd.android-dir/mms-sms“);4. startActivity(it); 发送短信1. Uri uri = Uri.parse(“smsto:0800000123“);2. Intent it = new Intent(Intent.ACTION_SENDTO, uri);3. it.putExtra(“sms_body“, “The SMS text“);4. startActivity(it); 发送彩信

12、1. Uri uri = Uri.parse(“content:/media/external/images/media/23“);2. Intent it = new Intent(Intent.ACTION_SEND);3. it.putExtra(“sms_body“, “some text“);4. it.putExtra(Intent.EXTRA_STREAM, uri);5. it.setType(“image/png“);6. startActivity(it);发送 Email1.2. Uri uri = Uri.parse(“mailto:“);3. Intent it =

13、new Intent(Intent.ACTION_SENDTO, uri);4. startActivity(it);1. Intent it = new Intent(Intent.ACTION_SEND);2. it.putExtra(Intent.EXTRA_EMAIL, ““);3. it.putExtra(Intent.EXTRA_TEXT, “The email body text“);4. it.setType(“text/plain“);5. startActivity(Intent.createChooser(it, “Choose Email Client“); 1. In

14、tent it=new Intent(Intent.ACTION_SEND); 2. String tos=““; 3. String ccs=““; 4. it.putExtra(Intent.EXTRA_EMAIL, tos); 5. it.putExtra(Intent.EXTRA_CC, ccs); 6. it.putExtra(Intent.EXTRA_TEXT, “The email body text“); 7. it.putExtra(Intent.EXTRA_SUBJECT, “The email subject text“); 8. it.setType(“message/

15、rfc822“); 9. startActivity(Intent.createChooser(it, “Choose Email Client“);添加附件1. Intent it = new Intent(Intent.ACTION_SEND);2. it.putExtra(Intent.EXTRA_SUBJECT, “The email subject text“);3. it.putExtra(Intent.EXTRA_STREAM, “url=file:/sdcard/mysong.mp3/url“);4. sendIntent.setType(“audio/mp3“);5. sta

16、rtActivity(Intent.createChooser(it, “Choose Email Client“);播放多媒体1. 2. Intent it = new Intent(Intent.ACTION_VIEW);3. Uri uri = Uri.parse(“url=file:/sdcard/song.mp3/url“);4. it.setDataAndType(uri, “audio/mp3“);5. startActivity(it);1. Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTE

17、NT_URI, “1“);2. Intent it = new Intent(Intent.ACTION_VIEW, uri);3. startActivity(it); Uninstall 程序1. Uri uri = Uri.fromParts(“package“, strPackageName, null);2. Intent it = new Intent(Intent.ACTION_DELETE, uri);3. startActivity(it);/调用相册public static final String MIME_TYPE_IMAGE_JPEG = “image/*“;pub

18、lic static final int ACTIVITY_GET_IMAGE = 0;Intent getImage = new Intent(Intent.ACTION_GET_CONTENT); getImage.addCategory(Intent.CATEGORY_OPENABLE); getImage.setType(MIME_TYPE_IMAGE_JPEG);startActivityForResult(getImage, ACTIVITY_GET_IMAGE);/调用系统相机应用程序，并存储拍下来的照片Intent intent = new Intent(MediaStore.

19、ACTION_IMAGE_CAPTURE); time = Calendar.getInstance().getTimeInMillis();intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(Environment.getExternalStorageDirectory().getAbsolutePath()+“/tucue“, time + “.jpg“);startActivityForResult(intent, ACTIVITY_GET_CAMERA_IMAGE);uninstall apkUri uninst

20、allUri = Uri.fromParts(“package“, “xxx“, null);returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);install apkUri installUri = Uri.fromParts(“package“, “xxx“, null);returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);play audioUri playUri = Uri.parse(“url=file:/sdcard/download/every

21、thing.mp3/url“);returnIt = new Intent(Intent.ACTION_VIEW, playUri);/发送附件Intent it = new Intent(Intent.ACTION_SEND); it.putExtra(Intent.EXTRA_SUBJECT, “The email subject text“); it.putExtra(Intent.EXTRA_STREAM, “url=file:/sdcard/eoe.mp3/url“); sendIntent.setType(“audio/mp3“); startActivity(Intent.cre

22、ateChooser(it, “Choose Email Client“);/搜索应用Uri uri = Uri.parse(“market:/search?q=pname:pkg_name“); Intent it = new Intent(Intent.ACTION_VIEW, uri); startActivity(it); /where pkg_name is the full package path for an application/进入联系人页面Intent intent = new Intent();intent.setAction(Intent.ACTION_VIEW);

23、intent.setData(People.CONTENT_URI);startActivity(intent);/查看指定联系人Uri personUri = ContentUris.withAppendedId(People.CONTENT_URI, info.id);/info.id联系人 IDIntent intent = new Intent();intent.setAction(Intent.ACTION_VIEW);intent.setData(personUri);startActivity(intent);在进行 Android开发的过程中，免不了，要开发 TCP/UDP通讯

24、的程序，下面这两段代码，分别介绍了 TCP/UCP通过的一个实例：代码一：private void tcpdata() try Socket s = new Socket(“192.168.0.25“, 65500);/ outgoing stream redirect to socketOutputStream out = s.getOutputStream();/ 注意第二个参数据为 true将会自动 flush，否则需要需要手动操作 out.flush()PrintWriter output = new PrintWriter(out, true);output.println(“Hel

25、lo IdeasAndroid! 伪 IP为：“+ SIMCardToIP(“13512345006“);InputStream inputStream = s.getInputStream();DataInputStream input = new DataInputStream(inputStream);byte b = new byte10000;int length = input.read(b);inputReader = new InputStreamReader(inputStream);String Msg = new String(b, 0, length, “gb2312“

26、);Toast.makeText(TcpTest.this, Msg, 1000).show();Log.d(“Tcp Demo“, “message From Server:“ + Msg);s.close(); catch (UnknownHostException e) e.printStackTrace(); catch (IOException e) e.printStackTrace();下面的代码是 UDP通讯的过程：public String send(String msg) StringBuilder sb = new StringBuilder();InetAddress

27、local = null;try local = InetAddress.getByName(“192.168.0.25“); / 本机测试 catch (UnknownHostException e) e.printStackTrace();try dSocket = new DatagramSocket(); / 注意此处要先在配置文件里设置权限,否则会抛权限不足的异常 catch (SocketException e) e.printStackTrace();int msg_len = msg = null ? 0 : msg.length();DatagramPacket dPacke

28、t = new DatagramPacket(msg.getBytes(), msg_len,local, SERVER_PORT);try dSocket.send(dPacket); catch (IOException e) e.printStackTrace();try dSocket.receive(dPacket);sb.append(new String(dPacket.getData(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();dSocket.close();return sb.toString();