Intent应该算是Android中特有的东西。你可以在Intent中指定程序要执行的动作(比如:view,edit,dial),以及程序执行到该动作时所需要的资料。都指定好后,只要调用startActivity(),Android系统会自动寻找最符合你指定要求的应用程序,并执行该程序。
下面列出几种Intent的用法
1、启动一个特定的Activity
启动一个特定的Activity是非常简单的,只需要将当前的Context和这个Activity的class作为参数构造一个Intent,然后再将这个Intent作为参数传递给startActivity方法即可
- Intent intent = new Intent(CurrentActivity.this,OtherActivity.class);
- startActivity(intent);
当执行了这个startActivity的方法后,一个新的Activity( OtherActiviy)将被创建,并且移到整个Activity的堆栈顶部
2、启动一个未指明的Activity
在程序当中很多时候我们并不去关心启动哪个Activity,而是将我们想启动哪个Activity的描述信息放置到Intent里面。然后让系统去寻找和匹配合适的Activity来启动,这样做是非常有好处的。比如对于第三方的Activity,它只需要描述自己在什么情况下被执行,如果我们启动Activity的描述信息正好和第三方Activity的描述信息相匹配的话,那么这个第三方的Activity就被启动了。
- Intent intent = new Intent(Intent.ACTION_DIAL,Uri.parse("tel:115-1345"));
- startActivity(intent);
我们并没有指定哪个Activity去执行,知识把我们对启动Activity的描述信息放到Intent当中。那么当执行startActivity方法后,Android系统就会去寻找,到底哪个Activity最合适。最后它根据描述信息找到处理电话的Activity,然后启动
3、处理一个Activity的返回值
startActivityForResult方法用于启动一个Activity并且新的Activity执行完后需要返回到启动它的Activity来执行回调函数
显示网页:
- Uri uri = Uri.parse("");
- Intent it = new Intent(Intent.ACTION_VIEW,uri);
- startActivity(it);
显示地图:
- Uri uri = Uri.parse("geo:38.899533,-77.036476");
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- Intent it = new Intent(Intent.Action_VIEW,uri);
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- startActivity(it);
路径规划:
- Uri uri = Uri.parse("%20startLng&daddr=endLat%20endLng&hl=en");
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- Intent it = new Intent(Intent.ACTION_VIEW,URI);
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- startActivity(it);
拨打电话:
调用拨号程序
- Uri uri = Uri.parse("tel:xxxxxx");
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- Intent it = new Intent(Intent.ACTION_DIAL, uri);
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- startActivity(it);
- Uri uri = Uri.parse("tel.xxxxxx");
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- Intent it =new Intent(Intent.ACTION_CALL,uri);
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- 要使用这个必须在配置文件中加入<uses-permission id="android.permission.CALL_PHONE" />
发送SMS/MMS
调用发送短信的程序
- Intent it = new Intent(Intent.ACTION_VIEW);
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- it.putExtra("sms_body", "The SMS text");
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- it.setType("vnd.android-dir/mms-sms");
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- startActivity(it);
发送短信
- Uri uri = Uri.parse("smsto:0800000123");
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- Intent it = new Intent(Intent.ACTION_SENDTO, uri);
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- it.putExtra("sms_body", "The SMS text");
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- startActivity(it);
发送彩信
- Uri uri = Uri.parse("content://media/external/images/media/23");
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- Intent it = new Intent(Intent.ACTION_SEND);
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- it.putExtra("sms_body", "some text");
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- it.putExtra(Intent.EXTRA_STREAM, uri);
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- it.setType("image/png");
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- startActivity(it);
发送Email
- Uri uri = Uri.parse("mailto:xxx@abc.com");
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- Intent it = new Intent(Intent.ACTION_SENDTO, uri);
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- startActivity(it);
- Intent it = new Intent(Intent.ACTION_SEND);
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- it.putExtra(Intent.EXTRA_EMAIL, "me@abc.com");
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- it.putExtra(Intent.EXTRA_TEXT, "The email body text");
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- it.setType("text/plain");
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- startActivity(Intent.createChooser(it, "Choose Email Client"));
- Intent it=new Intent(Intent.ACTION_SEND);
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- String[] tos={"me@abc.com"};
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- String[] ccs={"you@abc.com"};
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- it.putExtra(Intent.EXTRA_EMAIL, tos);
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- it.putExtra(Intent.EXTRA_CC, ccs);
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- it.putExtra(Intent.EXTRA_TEXT, "The email body text");
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- it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
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- it.setType("message/rfc822");
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- startActivity(Intent.createChooser(it, "Choose Email Client"));
添加附件
- Intent it = new Intent(Intent.ACTION_SEND);
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- it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
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- it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/mysong.mp3");
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- sendIntent.setType("audio/mp3");
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- startActivity(Intent.createChooser(it, "Choose Email Client"));
播放多媒体
- Intent it = new Intent(Intent.ACTION_VIEW);
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- Uri uri = Uri.parse("file:///sdcard/song.mp3");
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- it.setDataAndType(uri, "audio/mp3");
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- startActivity(it);
- Uri uri = Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI, "1");
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- Intent it = new Intent(Intent.ACTION_VIEW, uri);
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- startActivity(it);
Uninstall 程序
- Uri uri = Uri.fromParts("package", strPackageName, null);
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- Intent it = new Intent(Intent.ACTION_DELETE, uri);
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- startActivity(it);
uninstall apk
- Uri uninstallUri = Uri.fromParts("package", "xxx", null);
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-
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- returnIt = new Intent(Intent.ACTION_DELETE, uninstallUri);
install apk
- Uri installUri = Uri.fromParts("package", "xxx", null);
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-
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- returnIt = new Intent(Intent.ACTION_PACKAGE_ADDED, installUri);
play audio
- Uri playUri = Uri.parse("file:///sdcard/download/everything.mp3");
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-
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- returnIt = new Intent(Intent.ACTION_VIEW, playUri);
- //发送附件
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- Intent it = new Intent(Intent.ACTION_SEND);
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- it.putExtra(Intent.EXTRA_SUBJECT, "The email subject text");
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- it.putExtra(Intent.EXTRA_STREAM, "file:///sdcard/eoe.mp3");
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- sendIntent.setType("audio/mp3");
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- startActivity(Intent.createChooser(it, "Choose Email Client"));
market相关
- //搜索应用
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- Uri uri = Uri.parse("market://search?q=pname:pkg_name");
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- Intent it = new Intent(Intent.ACTION_VIEW, uri);
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- startActivity(it);
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- //where pkg_name is the full package path for an application
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- //显示指定应用的详细页面(这个好像不支持了,找不到app_id)
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- Uri uri = Uri.parse("market://details?id=app_id");
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- Intent it = new Intent(Intent.ACTION_VIEW, uri);
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- startActivity(it);
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- //where app_id is the application ID, find the ID
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- //by clicking on your application on Market home
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