Save to Internal Storage
Description
The following code shows how to save files to Internal Storage.
Example
Main 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" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Please enter some text" />
<EditText
android:id="@+id/txtText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/btnSave"
android:text="Save"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="onClickSave" />
<Button
android:id="@+id/btnLoad"
android:text="Load"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="onClickLoad" />
</LinearLayout>
MainActivity.java file
package com.java2s.myapplication3.app;
/*from w ww. ja v a2 s . c o m*/
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
public class MainActivity extends Activity {
EditText textBox;
static final int READ_BLOCK_SIZE = 100;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textBox = (EditText) findViewById(R.id.txtText1);
}
public void onClickSave(View view) {
String str = textBox.getText().toString();
try {
//SD Card Storage
File sdCard = Environment.getExternalStorageDirectory();
File directory = new File(sdCard.getAbsolutePath() +
"/MyFiles");
directory.mkdirs();
File file = new File(directory, "textfile.txt");
FileOutputStream fOut = new FileOutputStream(file);
OutputStreamWriter osw = new
OutputStreamWriter(fOut);
osw.write(str);
osw.flush();
osw.close();
Toast.makeText(getBaseContext(),
"File saved successfully!",
Toast.LENGTH_SHORT).show();
textBox.setText("");
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
Note
The preceding code uses the getExternalStorageDirectory() method to return the full path to the external storage.
Typically, it should return the "/sdcard" path for a real device, and "/mnt/ sdcard" for an Android emulator.
You should never try to hardcode the path to the SD card, as manufacturers may choose to assign a different path name to the SD card.
Note 2
In order to write to the external storage, you need to add the WRITE_EXTERNAL_STORAGE permission in your AndroidManifest.xml file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.java2s.Files"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="14" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".FilesActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>