Android file operation--read assets and raw file content _android

Files from resources and assets can only be read and cannot be written.

The files in the assets folder are kept in the original file format, and you need to read the files in Assetmanager as a byte stream.

1. Call Getassets () first in the activity to get the Assetmanager reference.

2. The Assetmanager open (String fileName, int accessmode) method specifies the read file and access mode to get the input stream inputstream.

3. Then, read the file with the InputStream of the open file, and remember Inputstream.close () when it is finished.

4. Call Assetmanager.close () to close Assetmanager.

Implementation steps:
1. Create Assets folders and Res/raw folders individually: (Note that raw files are new in res and then create a folder with the name Raw)

2. Create two txt files and copy to asset and raw folders:

3. Effect of implementation:

4. Implementation code:

(1) Layout file:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android=
"http://schemas.android.com/apk/" Res/android "
  xmlns:tools=" Http://schemas.android.com/tools "
  android:layout_width=" Match_parent
  " android:layout_height= "Match_parent"
  android:orientation= "vertical"
  tools:context= " Base.readassetsfile.MainActivity ">
  <button
    android:textsize=" 20sp "
    android:text=" @string Aasets_txt "
    android:id=" @+id/readfile "
    android:layout_width=" match_parent "
    android:layout_" height= "Wrap_content"/>
  <button
    android:textsize= "20sp"
    android:text= "@string/raw
    " Android:id= "@+id/readrawfile"
    android:layout_width= "match_parent"
    android:layout_height= "WRAP_" Content "/>
</LinearLayout>

(2) Specific implementation:

Package base.readassetsfile;
Import android.support.v7.app.AppCompatActivity;
Import Android.os.Bundle;
Import Android.util.Log;
Import Android.view.View;

Import Android.widget.EditText;
Import Java.io.BufferedReader;
Import java.io.IOException;
Import Java.io.InputStream;
Import Java.io.InputStreamReader;
Import Java.io.OutputStream;

Import java.io.UnsupportedEncodingException; public class Mainactivity extends Appcompatactivity implements View.onclicklistener {@Override protected void oncreat
    E (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.activity_main);
    Findviewbyid (R.id.readfile). Setonclicklistener (this);
  Findviewbyid (R.id.readrawfile). Setonclicklistener (this);
        @Override public void OnClick (View v) {switch (V.getid ()) {case R.id.readfile:readasset ();
      Break
        Case R.id.readrawfile:readraw ();
    Break The public void Readasset () {try {//Get file inbyte InputStream inputstream=getresources (). Getassets (). Open ("Test.txt");
      Converts bytes to characters inputstreamreader isreader=new InputStreamReader (InputStream, "UTF-8");
      Use Bufferreader to read content BufferedReader reader=new BufferedReader (Isreader);
      String out= "";
      while ((Out=reader.readline ())!=null) {log.d ("File information read:", out);
    } catch (IOException e) {e.printstacktrace (); } public void Readraw () {try {//Get the contents of the file InputStream inputstream=getresources (). Openrawresource (R.R
      Aw.test);
      Converts the bytes in the file to characters InputStreamReader isreader=new InputStreamReader (InputStream, "UTF-8");
      Use Bufferreader to read characters BufferedReader reader=new BufferedReader (Isreader);
      String out= "";
        try {while (Out=reader.readline ())!=null) {LOG.D ("data read from Raw folder:", out);
      } catch (IOException e) {e.printstacktrace (); } catch (Unsupportedencodingexception e) {e.printstAcktrace ();

 }
  }

}

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