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In the development of the app, you will often encounter the need to bulk cancel (delete) the data in the list. This requires ListView support batch selection, selection, radio and so on functions, do a more powerful ListView batch selection function is very necessary, then how to do?It is conceivable that to support the bulk selection, that CheckBox is indispensable to use, the following, the use of ListView combined with the checkbox to achieve the v
Android development, in different modules (such as activity) will often have a variety of data need to communicate with each other, commonly used in five ways of delivery. They have their own pros and cons and have their own application scenarios. Here are a few separate sections:1. Intent object passing simple dataThe extra portion of the intent can store the data
; } Public classEx0315servicereceiver extends broadcastreceiver{@Override Public voidOnReceive (Context context, Intent Intent) {Bundle Mbundle=Intent.getextras (); intCount=mbundle.getint ("Count"); Mtextview=(TextView) Findviewbyid (ID. Ex0315textview); Mtextview.settext (String.valueof (count)); } } }add in manifest service android:name="com.iruisi.service.Ex0315Service" android:exported="false" > This service is in a different bag.
= (*env)->newbytearray (Env,len); (*env)->setbytearrayregion (env, ByteArray, 0, len, buffer); CLS = (*env)->getobjectclass (env, retobj); FID = (* ENV)->getfieldid (env, CLS, "Retbytes", "[B"]); (*env)->setobjectField (env, retobj, FID, ByteArray); 4. How to return a string in C to java Char charstr[50]; Jstring jstr;jstr = env-Newstringutf (CHARSTR);5. How much space does not know how to use buffer, how to pass out? In the JNI C file, new out of space, passed out. Java
The first is the call service for the system clipboard:Clipboardmanager Clipboardmanager=getsystemservice (Context.clipboard_service);Then it is written, taken out.It is important to note that before Android version 11, the use of the Clipboard to pass data using the SetText and GetText methods, but after version 11, the two GetText and set methods are discarded, instead of the need to use the Clipdata obje
I. Public Intent PutExtra (String name, double[] value)Set Method Intent.putextra ("AAA", "bbbb");Get Method This.getintent (). Getcharsequenceextra ("AAA")Ii. public Intent Putextras (Bundle extras)Setup MethodBUNDLE BD = new bundle ();bd.putstring ("AAA", "bbbb");Intent.putextras (BD);Get MethodBundle bd=this.getintent (). Getextras ();bd.getstring ("AAA")); Iii. SummaryThe band S has to bind the data through a bundle.---Putextra and Putextras of
Set values by Putextra, get values by GetextraPutextra need to set the key-value pair, Getextra by the corresponding key to get the passed value (directly between the Getextra plus the value type you want to get)1. Open another activity in one activity through Startactivityforresult ()2. This method usually receives two parameters, the first one is the intent object, the second is the Requestcode3. In the first activity, rewrite the Onactivityresult method, by switch to determine the transmitted
I. Public Intent PutExtra (String name, double[] value)Set Method Intent.putextra ("AAA", "bbbb");Get Method This.getintent (). Getcharsequenceextra ("AAA")Ii. public Intent Putextras (Bundle extras)Setup MethodBUNDLE BD = new bundle ();bd.putstring ("AAA", "bbbb");Intent.putextras (BD);Get MethodBundle bd=this.getintent (). Getextras ();bd.getstring ("AAA")); Iii. SummaryThe band S has to bind the data through a bundle. ---Putextra and Putextras of
time and then delete one of the two.This is all done at the same time. Use the Add (), remove (), replace () method, add all the required changes, and then call the commit () method to apply the changes.Before the commit () method, you can call Addtobackstack () and add the transaction to the Backstack, which is the back stack by the activityManaged, when the user presses the return key, it returns to the
firstThe activity's OnPause () method does not call the OnStop () method, because the first activity is still visible. If you turn offClosed transparent activity, the first activity will only callback the Onresume () method.3 . Inventory Configuration for Activity If you want activity to be the portal for your application, you need to configure the activity's intent filter as follows:Android allows the program to have multiple activity as the portal of the application, as long as the activity i
Landing pageDeclare the intent object and start the Loginactivity ActivityIntent Intent = new Intent ();Intent.setclass (Loginactivity.this, Mainactivity.class);String Strusername=m_txtusername.gettext (). toString ();Intent.putextra ("UserName", strusername);//Transfer to main interfaceStartActivity (Intent);Deleting the current activity from the history stack will not return to the activity when the user taps the "back" button.Finish ();Main interfa
Activity transmits data to the broadcast receiver simply by put the data into the intent before sending the broadcast.How does a broadcast receiver transmit data to the activity? The interface is used here, by defining an interface in the broadcast receiver, and then the activity that receives the broadcast receiver data
There are two ways to pass data between Fragment and activity, one is to use setargument and one is to use an interface callback. Learn the first method below.( 1 ) using setargument Method:for the sake of understanding, I am here to make a metaphor: if Act ivity is the emperor, it set up three departments (such as the three provinces six), respectively, is Fragment1,fragment2 and the Fragemnt3 ;now he's going to command the department . Fra Gment1 to
= Data.getstringextra ("Third"); LOG.D ("Firstactivity", data3); } Break; default: } }The above is the three cases of their own judgment, in fact, if only two activity, then only need a case to be able. It can be seen that in order to return the data successfully, it is necessary to match in case, then ResultCode also need to match successfully.It can be understood that: a letter sent and received, need the address on the env
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