Android reads resources under the assets directory

1. Get the input stream for a resource

The resource file Sample.txt is located in the $PROJECT _home/assets/directory and can be used in the Activity

Context.getassets (). Open ("Sample.txt")

method to get the input stream.

Note: If the resource file is a text file, you need to consider the encoding and line breaks of the file. It is recommended to use UTF-8 and Unix line breaks.

2. WebView loading HTML files in the assets directory

The resource file sample.html is located in the $PROJECT _home/assets/directory, which is available through the following code

Webview.loadurl ("file:///android_asset/sample.html");

Loads the HTML file.



The Android system provides a/assets directory for each newly designed program, and the files stored in this directory can be packaged in a program. The difference between/res and/assets is that Android does not generate IDs for files under/assets. If you use a file under/assets, you need to specify the path and file name of the file. The following example shows how to access the content under/assets.



Create the/image subdirectory in the file/assets, and copy the Icon.png subdirectory under/res/drawable to the directory. Create the Readme.txt file in the/assets subdirectory, and enter the text "Hello,world!!!" in the file.



Layout file: Main.xml

<?xml version= "1.0" encoding= "Utf-8"?>

<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"

android:orientation= "Vertical"

Android:layout_width= "Fill_parent"

android:layout_height= "Fill_parent"

>

<textview

Android:layout_width= "Fill_parent"

android:layout_height= "Wrap_content"

android:text= "@string/hello"

/>

<edittext android:id= "@+id/firstid"

Android:layout_width= "Fill_parent"

android:layout_height= "Wrap_content"

android:text= "@string/hello"

/>

<edittext android:id= "@+id/secondid"

Android:layout_width= "Fill_parent"

android:layout_height= "Wrap_content"

android:text= "@string/hello"

/>

</LinearLayout>






Program Files:

Package com.cn.getassets;



Import android.app.Activity;

Import Android.os.Bundle;

Import Java.io.ByteArrayOutputStream;

Import java.io.IOException;

Import Java.io.InputStream;

Import android.app.Activity;

Import Android.content.res.AssetManager;

Import Android.os.Bundle;

Import Android.util.Log;

Import Android.widget.EditText;



public class Getassets extends Activity {

Private EditText Firstfield;

Private EditText Secondfield;

@Override

public void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);

LOG.D ("Show Main.xml", "OK");

Setcontentview (R.layout.main);

LOG.D ("Show Main.xml", "OK");

Assetmanager Assetmanager = Getassets ();

string[] files = null;

try {

Files = assetmanager.list ("image");

} catch (IOException e) {

LOG.E ("tag", E.getmessage ());

}

Firstfield = (EditText) Findviewbyid (R.id.firstid);

Firstfield.settext (integer.tostring (files.length) + "file. File name is "+ files[0]);

InputStream inputstream = null;

try {

InputStream = Assetmanager.open ("readme.txt");

} catch (IOException e) {

LOG.E ("tag", E.getmessage ());

}

String s = readtextfile (InputStream);

Secondfield = (EditText) Findviewbyid (R.id.secondid);

Secondfield.settext (s);

}



Private String ReadTextFile (InputStream inputstream) {

Bytearrayoutputstream outputstream = new Bytearrayoutputstream ();

byte buf[] = new byte[1024];

int Len;

try {

while (len = Inputstream.read (BUF))! =-1) {

Outputstream.write (buf, 0, Len);

}

Outputstream.close ();

Inputstream.close ();

} catch (IOException e) {

}

return outputstream.tostring ();

}

}

Android reads resources under the assets directory