intent應該算是android中特有的東西。你可以在intent中指定程式要執行的動作（比如：view,edit,dial），以及程式執行到該動作時所需要的資料。都指定好後，只要呼叫startactivity()，android系統會自動尋找最符合你指定要求的應用程式，並執行該程式。
下面列出幾種intent的用法
顯示網頁:
uri uri = uri.parse("");
intent it= new intent(intent.action_view,uri);
startactivity(it);
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顯示地圖:
uri uri = uri.parse("geo:38.899533,-77.036476");
intent it = new intent(intent.action_view,uri);
startactivity(it);
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路徑規劃:
uri uri = uri.parse("");
intent it = new intent(intent.action_view,uri);
startactivity(it);
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uri uri = uri.parse("tel:******");
intent it = new intent(intent.action_dial, uri);
startactivity(it);
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uri uri = uri.parse("tel.******");
intent it =new intent(intent.action_call,uri);
要使用這個必須在配置檔案中加入
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傳送sms/mms
呼叫傳送簡訊的程式
intent it = new intent(intent.action_view);
it.putextra("sms_body", "the sms text");
it.settype("vnd.android-dir/mms-sms");
startactivity(it);
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傳送簡訊
uri uri = uri.parse("smsto:0800000123");
intent it = new intent(intent.action_sendto, uri);
it.putextra("sms_body", "the sms text");
startactivity(it);
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傳送彩信
uri uri = uri.parse("content://media/external/images/media/23");
intent it = new intent(intent.action_send);
it.putextra("sms_body", "some text");
it.putextra(intent.extra_stream, uri);
it.settype("image/png");
startactivity(it);
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傳送email
uri uri = uri.parse("mailto:***@abc.com");
intent it = new intent(intent.action_sendto, uri);
startactivity(it);
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intent it = new intent(intent.action_send);
it.putextra(intent.extra_email, "[email protected]");
it.putextra(intent.extra_text, "the email body text");
it.settype("text/plain");
startactivity(intent.createchooser(it, "choose email client"));
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intent it=new intent(intent.action_send);
string tos=;
string ccs=;
it.putextra(intent.extra_email, tos);
it.putextra(intent.extra_cc, ccs);
it.putextra(intent.extra_text, "the email body text");
it.putextra(intent.extra_subject, "the email subject text");
it.settype("message/rfc822");
startactivity(intent.createchooser(it, "choose email client"));
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新增附件
intent it = new intent(intent.action_send);
it.putextra(intent.extra_subject, "the email subject text");
it.putextra(intent.extra_stream, "file:///sdcard/mysong.***");
sendintent.settype("audio/***");
startactivity(intent.createchooser(it, "choose email client"));
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intent it = new intent(intent.action_view);
uri uri = uri.parse("file:///sdcard/song.***");
it.setdataandtype(uri, "audio/***");
startactivity(it);
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intent it = new intent(intent.action_view, uri);
startactivity(it);
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uninstall 程式
uri uri = uri.fromparts("package", strpackagename, null);
intent it = new intent(intent.action_delete, uri);
startactivity(it);
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uninstall apk
uri uninstalluri = uri.fromparts("package", "***", null);
returnit = new intent(intent.action_delete, uninstalluri);
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install apk
uri installuri = uri.fromparts("package", "***", null);
returnit = new intent(intent.action_package_added, installuri);
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play audio
uri playuri = uri.parse("file:///sdcard/download/everything.***");
returnit = new intent(intent.action_view, playuri);
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//傳送附件
intent it = new intent(intent.action_send);
it.putextra(intent.extra_subject, "the email subject text");
it.putextra(intent.extra_stream, "file:///sdcard/eoe.***");
sendintent.settype("audio/***");
startactivity(intent.createchooser(it, "choose email client"));
//搜尋應用
uri uri = uri.parse("market://search?q=pname:pkg_name");
intent it = new intent(intent.action_view, uri);
startactivity(it);
intent it = new intent(intent.action_view, uri);
startactivity(it);
//page, and notice the id from the address bar
玩過android的都清楚， camera有倆種模式：照相模式和錄影模式。
啟動錄影模式：
intent i = new intent();
i.setaction(「android.media.action.video_camera「);
startactivity(i);
啟用照相模式：
intent i = new intent();
i.setaction(「android.media.action.still_image_camera「);
startactivity(i);
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