Differences between the use of raw files in Android source files assets and res

when creating a project, the assets file is created by default, of course, we can also create raw folders under the res file, which can store some images, audio or text information, it can be used in Program , but there are also differences between them.

files under assets are not compiled and can be accessed through paths. Raw files are automatically compiled. You can find the corresponding ID in the R. Java file,

See the following:

In this case, how do we put resources into these two files?

I personally prefer to compare the file size. If the file is larger, It will be placed in the aeests file. Because the information in this file is used, it is equivalent to performing Io stream operations, time-consuming operations

It is important to obtain the resource methods in the assets and raw folders:

Assets: assetmanager = getassets ();

Raw: inputstream = getresources (). openrawresource (R. Raw. Demo );

The following demo ActivitySource code:

Package Com. jiangqq. aeesrtandraw;

ImportJava. Io. bytearrayoutputstream;
ImportJava. Io. ioexception;
ImportJava. Io. inputstream;

ImportAndroid. App. activity;
ImportAndroid. content. res. assetmanager;
ImportAndroid. OS. Bundle;
ImportAndroid. widget. edittext;

/**
* This demo demonstrates how to use files in the assets and raw folders.
*
*@ AuthorJiangqq
*
 */
Public ClassAeesrtsandrawactivityExtendsActivity {
PrivateEdittext ET1, et2;

@ Override
Public VoidOncreate (bundle savedinstancestate ){
Super. Oncreate (savedinstancestate );
Setcontentview (R. layout. Main );

Readassets ();
Readraw ();
}

/**
* Use files in assets
*/
Private Void Readassets (){
ET1 = (edittext) findviewbyid (R. Id. ET1 );
Assetmanager = getassets ();
Try {
Inputstream = assetmanager. Open ("demo.txt ");
Et1.settext (read (inputstream ));
} Catch (Ioexception e ){
E. printstacktrace ();
}
}

/**
* use raw files
*/
private void readraw () {
et2 = (edittext) findviewbyid (R. id. et2);
inputstream = getresources (). openrawresource (R. raw. demo);
et2.settext (read (inputstream);
}

/**
* Read and write Io streams
*
*@ ParamInputstream
*@ ReturnOstream. tostring () or "file read/write failed"
*/
PrivateString read (inputstream ){

Try {
Bytearrayoutputstream ostream =New Bytearrayoutputstream ();
Int Length;
While (Length = inputstream. Read ())! =-1 ){
Ostream. Write (length );
}
Return Ostream. tostring ();
} Catch (Ioexception e ){
Return "File read/write failed ";
}
}
}

 

Layout file:
<? XML version = "1.0" encoding = "UTF-8" ?>
< Linearlayout Xmlns: Android = "Http://schemas.android.com/apk/res/android"
Android: layout_width = "Fill_parent"
Android: layout_height = "Fill_parent"
Android: Orientation = "Vertical"   >

linearlayout
Android: layout_width =" fill_parent "
Android: layout_height =" wrap_content "
Android: orientation = "horizontal" >

textview
Android: layout_width =" wrap_content "
Android: layout_height =" wrap_content "
Android: text =" @ string/ET1 " />

edittext
Android: ID =" @ + ID/ET1 "
Android: layout_width = "fill_parent"
Android: layout_height =" wrap_content " />
linearlayout >

linearlayout
Android: layout_width =" fill_parent "
Android: layout_height =" wrap_content "
Android: orientation = "horizontal" >

textview
Android: layout_width =" wrap_content "
Android: layout_height =" wrap_content "
Android: text =" @ string/et2 " />

edittext
Android: ID =" @ + ID/et2 "
Android: layout_width = "fill_parent"
Android: layout_height =" wrap_content " />
linearlayout >

</Linearlayout>Demo running effect:

In this case, OK.

URL: http://greatverve.cnblogs.com/archive/2012/01/09/android-assets-res.html