Android

Pointer The pointer is reflected to /GEN/package/name/scriptc_renderscript_filename. You can declare a pointer to a struct or any other type supported by renderscript, but the struct cannot contain pointers or nested arrays. For example, if you

Work with memory Non-static and global variables declared in renderscript will be allocated memory during compilation. In renderscriptCodeYou can directly use these variables to work without allocating memory to them at the android framework layer.

It is the default action of the system to retain the activity status when the activity is terminated. In this way, when the user returns to the previous activity, the user interface will display the way they left. However, in the scenario where the

When using the initloader () method, if the loader with the specified ID exists, use the existing loader. Otherwise, a new loader is created. However, sometimes you want to discard the old data and restart the loader. You can use restartloader ()

To manage fragment in an activity, you need to use the fragmentmanager object. You can obtain this object by calling the getfragmentmanager () method in the activity. The fragmentmanager object can do the following: 1. Get the existing fragment in

Put data into the database You can import the contentvalues object into the instert () method to insert data into the database: // Gets the data repository in write modeSqlitedatabase DB = mdbhelper. getwritabledatabase (); // Create a new map of

The ability to add, delete, replace, and use fragment in an activity to respond to user interaction is a great feature. Each change set you submit to the activity is called a transaction, and you can use APIs in fragmenttransaction to execute it.

Read and Write global variables Reading and Writing global variables is a simple process. You can use the accessors method on the android framework layer or directly set them on the renderscript code layer. Remember any changes in the renderscript

Verify that there is an application to receive intent objects Although the Android platform ensures that the determined intent object will be received by the built-in applications (such as phone, email, calendar, and other applications), before

Call renderscript code You can use _Script_nameCreates an renderscript object and calls renderscript from the android framework code. This class contains a foreach_root () method, which calls the rsforeach () method. You can pass it the same

This article translated from: http://developer.android.com/training/basics/intents/filters.html The previous two lessons have been focusing on one side of the story: Start the activity of another application from your application. However, if your

This article translated from: http://developer.android.com/guide/topics/graphics/opengl.html#compatibility OpenGL version and device compatibility Android system supports OpenGL since 1.0Es 1.0 and 1.1 specifications, starting from android2.2 (API

An application usually contains multiple activities. Each activity should be designed around the specific action types that a user can execute and be able to start other activities. For example, an email application may have an activity used to

Use valueanimator to create an animation The valueanimator class specifies certain types of animation values during animation playback by setting int, float, or color values during the animation process. Obtain a valueanimator object through a

Find a device You can use the descrithadapter object to locate a remote Bluetooth device by discovering or querying the list of paired devices. Device discovery is a scanning process that searches for available Bluetooth devices in the local area,

This article translated from: http://developer.android.com/guide/topics/sensors/sensors_environment.html#sensors-using-humid The Android platform provides four sensors that monitor various environmental attributes. These sensors can be used to

Enable device discoverability To make the local device accessible to other devices, call the startactivityforresult (intent, INT) method of the action_request_discoverable operation intent. This method sends a request to the system settings to

This article translated from: http://developer.android.com/guide/topics/data/install-location.html From API Level 8, you can allow your applications to be installed on External Storage (such as the device's SD card ). This is an optional feature.

Applications that should not be installed on External Storage When a user enables USB memory to share files with a computer (or detaches or removes external memory), any application installed on the external memory that is currently running will be

This article translated from: http://developer.android.com/training/sharing/receive.html Just as your application can send data to other applications, it can easily receive data from other applications. When receiving data from other applications,