android开发技巧

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. 清空手机 Cookie

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

28. 用注释来控制隐藏字段 {@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";  

不通过反射机制使用内部API和隐藏API的方法参考：http://luhuajcdd.iteye.com/blog/1242395