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How to Import file from external storage - Android Tutorial

In this example, we can see how to import the file in external location. Fetching the data from that file and show it in Log-cat as well as in List-view. 




This simple example, contains one button (Click to import from SD card) to access the file data from an external location.

Now follow the coding to develop this simple application  

Create a New Project

1. activity_main.xml

<RelativeLayout 
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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.example.readfile.MainActivity" >
<Button        
android:id="@+id/btnclick"        
android:layout_width="wrap_content"        
android:layout_height="wrap_content"        
android:text="@string/click" />    
<View        
ndroid:id="@+id/viewid"       
 android:layout_width="match_parent"        
android:layout_height="10dp"       
 android:layout_below="@+id/btnclick"        
android:background="#7FFF00" />    
<ListView        
android:id="@+id/name_list"        
android:layout_width="wrap_content"        
android:layout_height="wrap_content"        
android:layout_below="@+id/viewid" >    
</ListView>
</RelativeLayout>

2. MainActivity.java


public class MainActivity extends Activity {

Button click;
ArrayList<String> array;
ListView lv;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

click = (Button) findViewById(R.id.btnclick);
lv = (ListView) findViewById(R.id.name_list);

click.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
try {
String state = Environment.getExternalStorageState();
if (!(state.equals(Environment.MEDIA_MOUNTED))) {
Toast.makeText(null, "There is no sd card",
Toast.LENGTH_LONG).show();
} else {
File sdcard = Environment.getExternalStorageDirectory();
File file = new File(sdcard, "/Names/Names");
BufferedReader br = new BufferedReader(new FileReader(
file));
                                               String st = "";
array = new ArrayList<String>();
while ((st = br.readLine()) != null) {
Log.e("", "" + st);
array.add(st);
Log.e("ARRAY", "" + array);
}
setlist(array);
}

} catch (Exception e) {
Log.e("", "" + e);
}
}

});
}

private void setlist(ArrayList<String> array2) {
// TODO Auto-generated method stub

ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, array2);
lv.setAdapter(arrayAdapter);

}
}

3. Manifest

Finally give permission to access from external storage

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >


When touch/click the button, the values from the file in the given path in external storage will get read. 

Below image illustrates the file in an external storage from which we have to get values.


Output 



__________________________________________________________________

Source code for this application ImportFilefromExternalStorage.zip

                                                Happy Coding...

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