Simple record of using <meta-data> in Android

<span id="Label3"></p><p><p>,<meta-data> elements can be used as child elements in androidmanifest.xml, and are included in <activity>, <application>, <service>, and < Receiver> element, but<br>Different parent elements, and the methods that are read when they are applied are also different.</p></p><p><p>First: the use of application:</p></p><p><p>XML sample:</p></p><p><p><application><strong><br><span style="color: #ff0000;"><meta-data android:value= "test" android:name= "meta_value" ></meta-data></span><br></strong></application></p></p><p><p>Java Extract Meta-data information:</p></p><p><p>ApplicationInfo appInfo = This.getpackagemanager (). getapplicationinfo (getpackagename (), Packagemanager.get_meta_ DATA);<br>String data = appInfo.metaData.getString ("meta_value");<br>System.out.println ("meta_value:" +data);</p></p><p><p>Application Scenarios:</p></p><p><p>General Settings Map key, Aurora push secret key and other information</p></p><p><p><meta-data android:name= "com.baidu.lbsapi.API_KEY" <em style="line-height: 1.5;">android:value= "xxxxxx"/></em></p></p><p><p><em id="__mceDel" style="line-height: 1.5;"><meta-data</em> <em id="__mceDel" style="line-height: 1.5;">android:name= "jpush_appkey"</em> <em id="__mceDel" style="line-height: 1.5;">android:value= "xxxxx"/></em></p></p><p><p><em style="line-height: 1.5;"></em> second: in the use of activity:</p></p><p><p>XML sample:</p></p><p><p><activity><strong><br><span style="color: #ff0000;"><meta-data android:value= "test" android:name= "<strong>meta_value</strong>" ></meta-data</span>><br></strong></activity></p></p><p><p>Java Extract Meta-data information:</p></p><p><p>Activityinfo info = This.getpackagemanager (). getactivityinfo (getcomponentname (), packagemanager.get_meta_data);<br>String data = info.metaData.getString ("meta_value");<br>System.out.println ("meta_value:" +data);</p></p><p><p>Application Scenarios:</p></p><p><p>A fixed value needs to be referenced in a specific activity and can be configured in Xml.</p></p><p><p>Third: the use of receiver in the Case:</p></p><p><p>XML sample:</p></p><p><p><receiver android:name= "metadatareceiver" ><br><span style="color: #ff0000;"> <strong><meta-data android:value= "test" android:name= "meta_value" ></meta-data></strong></span><br><intent-filter><br><action android:name= "android.intent.action.PHONE_STATE" ></action><br></intent-filter><br></receiver></p></p><p><p>Java Extract Meta-data information:</p></p><p><p>ComponentName cn=new componentname (context, metadatareceiver.class);<br>Activityinfo info=context.getpackagemanager (). getreceiverinfo (cn, packagemanager.get_meta_data);<br>String data=info.metadata.getstring ("meta_value");<br>System.out.println ("meta_value:" +data);</p></p><p><p><em style="line-height: 1.5;">　　　　</em>Iv: usage in service:</p></p><p><p>XML sample:</p></p><p><p><service android:name= "metadataservice" ><strong><br><span style="color: #ff0000;"><meta-data android:value= "hello my service" android:name= "mymsg" ></meta-data></span><br></strong></service></p></p><p><p>Java Extract Meta-data information:</p></p><p><p>ComponentName cn=new componentname (this, metadataservice.class);<br>ServiceInfo info=this.getpackagemanager (). getserviceinfo (cn, packagemanager.get_meta_data);<br>String msg=info.metadata.getstring ("mymsg");<br>System.out.println ("mymsg:" +msg);</p></p><p><p>Simple record of using <meta-data> in Android</p></p></span>