file external memory

1. Data Management, External Memory
Note: you must have SD card
Note: write an “android.permission.WRITE_EXTERNAL_STORAGE
” in your manifest file
Step1. Create a newAndroidProject.
Step2. Add the followingcode toyouractivityxml file.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/image"
android:contentDescription="@string/android_painter_desc"
android:layout_centerInParent="true"/>
</RelativeLayout>
Step3. Add the followingcode intoyour“values.xml file
<string name="android_painter_desc">Android Painter</string>
Step4. Add a raw folderandcopy a png image inthe raw folder
Step5. Add the followingcode inOncreate methodof yourmainactivity
if (Environment.MEDIA_MOUNTED.equals(Environment
.getExternalStorageState())) {
File outFile = new File(

2. getExternalFilesDir(Environment.DIRECTORY_PICTURES),
fileName);
if (!outFile.exists())
copyImageToMemory(outFile);
ImageView imageview = (ImageView) findViewById(R.id.image);
imageview.setImageURI(Uri.parse("file://" + outFile.getAbsolutePath()));
}
Step6. Add The followingfunctionsinyourmainactivity
private void copyImageToMemory(File outFile) {
try {
BufferedOutputStream os = new BufferedOutputStream(
new FileOutputStream(outFile));
BufferedInputStream is = new BufferedInputStream(getResources()
.openRawResource(R.raw.painter));
copy(is, os);
} catch (FileNotFoundException e) {
Log.e(TAG, "FileNotFoundException");
}
}
private void copy(InputStream is, OutputStream os) {
final byte[] buf = new byte[1024];
int numBytes;
try {
while (-1 != (numBytes = is.read(buf))) {
os.write(buf, 0, numBytes);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
os.close();
} catch (IOException e) {
Log.e(TAG, "IOException");
}
}
}
Step7. Done.