android開發技巧

1. Intent open a picture file public: 

Intent intent = new Intent("android.intent.action.VIEW");  intent.addCategory("android.intent.category.DEFAULT");  intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK);  Uri uri = Uri.fromFile(new  File("/mnt/sdcard/images/001041580.jpg"));  intent.setDataAndType (uri, "image/*");  this.startActivity(intent);  

 

2. Intent to open a PDF file: 

Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK); Uri uri = Uri.fromFile(new File("file:///android_asset/helphelp.pdf")); intent.setDataAndType (uri, "application/pdf"); this.startActivity(intent);

 

3. Intent to open a text file:

 

Intent intent = new Intent("android.intent.action.VIEW");  intent.addCategory("android.intent.category.DEFAULT");  intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK);  if (paramBoolean)  {    Uri uri1 = Uri.parse (param);    intent.setDataAndType (URI1, "text/plain");  }  else  {    Uri uri = Uri.fromFile(new File("/mnt/sdcard/hello.txt"));    intent.setDataAndType (URI2, "text/plain");  }  this.startActivity(intent);  

 

4. Intent to open the audio file:

Intent intent = new Intent("android.intent.action.VIEW");  intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  intent.putExtra ("oneshot", 0);  intent.putExtra ("configchange", 0);  Uri uri = Uri.fromFile(new File("/mnt/sdcard/ren.mp3"));  intent.setDataAndType (uri, "audio/*");  this.startActivity(intent);  

 

5. Intent to open the video file: 

Intent intent = new Intent("android.intent.action.VIEW");  intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);  intent.putExtra ("oneshot", 0);  intent.putExtra ("configchange", 0);  Uri uri = Uri.fromFile(new File("/mnt/sdcard/ice.avi"));  intent.setDataAndType (uri, "video/*");  this.startActivity(intent);  

 

6. Intent to open the CHM file:

Intent intent = new Intent("android.intent.action.VIEW");  intent.addCategory("android.intent.category.DEFAULT");  intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK);  Uri uri = Uri.fromFile(new File("/mnt/sdcard/ice.chm"));  intent.setDataAndType (uri, "application / x-chm");  this.startActivity(intent);  

 

7. Intent to open a Word document: 

Intent intent = new Intent("android.intent.action.VIEW"); intent.addCategory("android.intent.category.DEFAULT"); intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK); Uri uri = Uri.fromFile(new File("/system/etc/help.doc")); intent.setDataAndType(uri, "application/msword"); this.startActivity(intent);

 

8. Android Excel intent: 

Intent intent = new Intent("android.intent.action.VIEW");  intent.addCategory("android.intent.category.DEFAULT");  intent.addFlags (Intent.FLAG_ACTIVITY_NEW_TASK);  Uri uri = Uri.fromFile(new File("/mnt/sdcard/Book1.xls"));  intent.setDataAndType (uri, "application/vnd.ms-excel");  this.startActivity(intent);  

  

10. Display Html page: 

Uri uri = Uri.parse ("http://www.google.com");   Intent intent = new Intent (Intent.ACTION_VIEW, uri);   this.startActivity(intent);  

 

11. Show map:

Uri uri = Uri.parse ("geo: 38.899533, -77.036476");   Intent intent = new Intent (Intent.Action_VIEW, uri);   this.startActivity(intent);  

 

12. Call the dialer:

Uri uri = Uri.parse ("tel: xxxxxx");   Intent intent = new Intent (Intent.ACTION_DIAL, uri);   this.startActivity(intent);  

 

13. Call :

Uri uri = Uri.parse ("tel: xxxxxx");   Intent it = new Intent (Intent.ACTION_CALL, uri);    this.startActivity(intent);  /*permission:  <uses-permission id="android.permission.CALL_PHONE"> </uses-permission> */  

 

14. Call to send text messages of the program :

Intent intent = new Intent (Intent.ACTION_VIEW);  intent.putExtra("sms_body", "The SMS text");  intent.setType("vnd.android-dir/mms-sms");  this.startActivity(intent);  

 

15. Send SMS :

Uri uri = Uri.parse("smsto:0800000123");  Intent intent = new Intent(Intent.ACTION_SENDTO, uri);  intent.putExtra("sms_body", "The SMS text");  this.startActivity(intent);  

 

16. Send MMS :

Uri uri = Uri.parse("content://media/external/images/media/23");  Intent intent = new Intent(Intent.ACTION_SEND);  intent.putExtra("sms_body", "some text");  intent.putExtra(Intent.EXTRA_STREAM, uri);  intent.setType("image/png");   this.startActivity(intent);  

 

17. Send an Email :

Uri uri = Uri.parse ("mailto: xxx@abc.com");   Intent intent = new Intent (Intent.ACTION_SENDTO, uri);    this.startActivity(intent);  

 

18. Send an Email with body :

Intent intent = new Intent(Intent.ACTION_SEND);  intent.putExtra(Intent.EXTRA_EMAIL,"me@abc.com");  intent.putExtra(Intent.EXTRA_TEXT,"The email body text");  intent.setType ("text/plain");  this.startActivity(  Intent.createChooser(intent, "Choose Email Client"));    

 

19. Send an Email with body,to,cc :

Intent intent = new Intent(Intent.ACTION_SEND);  String [] tos ={"me@abc.com"};  String [] ccs ={"you@abc.com"};  intent.putExtra(Intent.EXTRA_EMAIL, tos);  intent.putExtra(Intent.EXTRA_CC, ccs);  intent.putExtra(Intent.EXTRA_TEXT, "The email body text");  intent.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");  intent.setType("message/rfc822");  this.startActivity(  Intent.createChooser(intent, "Choose Email Client"));    

 

20. Send an Email with attachments :

Intent intent = new Intent(Intent.ACTION_SEND);  intent.putExtra(Intent.EXTRA_SUBJECT,"The email subject text");  intent.putExtra(Intent.EXTRA_STREAM,"file :///sdcard/mysong.mp3");  sendIntent.setType("audio/mp3");  this.startActivity(  Intent.createChooser(intent,"Choose Email Client"));    

 

21. Uninstall the program :

Uri uri = Uri.fromParts ("package", strPackageName, null);  Intent intent = new Intent (Intent.ACTION_DELETE, uri);   this.startActivity(  Intent.createChooser(intent,"Choose Email Client"));    

 

22. Install the apk :

Uri installUri = Uri.fromParts("package", "xxx", null);  returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);   this.startActivity(returnIt);    

 

23. Search applications :

Uri uri = Uri.parse("market://search?Q=pname:pkg_name");  Intent intent = new Intent(Intent.ACTION_VIEW, uri);  this.startActivity(intent);    //Where pkg_name is the full package path for an application  

 

24. Google Search Launch Web Browser :

Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);  String term = "Android";  intent.putExtra(SearchManager.QUERY, term);  activity.startActivity(intent);  

 

25. Send text using Intent (to messaging apps) :

Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);  String msgBody = "This is message";  Intent intent = new Intent(android.content.Intent.ACTION_SEND);  intent.setType("text/plain");  intent.putExtra(android.content.Intent.EXTRA_SUBJECT,   "message subject");  intent.putExtra(android.content.Intent.EXTRA_TEXT, msgBody);  activity.startActivity(Intent.createChooser(intent, getResources().  getString(R.string.share_by_using)));  

 

26. Create Shortcut on "Home Screen" :

Intent intent = new Intent(Intent.ACTION_WEB_SEARCH);  Intent toPrint = new Intent(this, anCreateshutcut.class);    Intent addShortcut = new Intent  ("com.android.launcher.action.INSTALL_SHORTCUT");    addShortcut.putExtra(Intent.EXTRA_SHORTCUT_NAME, "Shutcutname");    addShortcut.putExtra(Intent.EXTRA_SHORTCUT_INTENT, toPrint);    addShortcut.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE,   Intent.ShortcutIconResource.fromContext(this, R.drawable.icon));     Manifest file:  <intent-filter>      <action android:name="android.intent.action.CREATE_SHORTCUT">      <category android:name="android.intent.category.LAUNCHER">    </category></action></intent-filter>  <uses-permission android:name="com.android.launcher.  permission.INSTALL_SHORTCUT">  </uses-permission>  

 

27. 清空手機 Cookie

CookieSyncManager.createInstance(getApplicationContext());  CookieManager.getInstance().removeAllCookie();  

 

28. 用注釋來控制隱藏欄位 {@hide}

/**  * Activity Action:  Start this activity to request system shutdown.  * The optional boolean extra field {@link #EXTRA_KEY_CONFIRM} can be set to true  * to request confirmation from the user before shutting down.  *  * <p class="note">This is a protected intent that can only be sent  * by the system. </p> *  * {@hide}  */  public static final String ACTION_REQUEST_SHUTDOWN = "android.intent.action.ACTION_REQUEST_SHUTDOWN";  

不通過反射機制使用內部API和隱藏API的方法參考：http://luhuajcdd.iteye.com/blog/1242395