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TestRandomAccessFile.java
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TestRandomAccessFile.java
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package com.example.andriodtest;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.nio.channels.FileChannel;
import android.app.Activity;
import android.content.ContentResolver;
import android.net.Uri;
import android.util.Log;
public class TestRandomAccessFile {
private static final String TAG = "TestRandomAccessFile";
private RandomAccessFile mFileInput = null;
private FileChannel mFileInput2 = null;
private String mFileUri = null;
TestRandomAccessFile(Activity activity) {
mActivity = activity;
}
public final String fileUri() {
return mFileUri;
}
public void setFileUri(String mFileUri) {
this.mFileUri = mFileUri;
}
private void closeFile() {
if (mFileInput != null) {
try {
mFileInput.close();
mFileInput = null;
} catch (IOException e) {
Log.e(TAG, "closeFile error! " + e);
e.printStackTrace();
}
}
if (mFileInput2 != null) {
try {
mFileInput2.close();
mFileInput2 = null;
} catch (IOException e) {
Log.e(TAG, "closeFile error! " + e);
e.printStackTrace();
}
}
}
private Activity mActivity = null;
private final InputStream getInputStream(Uri uri)
throws FileNotFoundException {
ContentResolver cr = mActivity.getContentResolver();
return cr.openInputStream(uri);
}
private boolean openFile() {
Log.d(TAG, "openFile2");
if (mFileUri != null && mFileInput == null) {
Uri uri = Uri.parse(mFileUri);
try {
Log.d(TAG,
"uri:" + uri.toString() + " getPath:" + uri.getPath()
+ " getEncodedPath:" + uri.getEncodedPath());
File file = new File(uri.getPath());
mFileInput = new RandomAccessFile(file, "rwd");
mFileInput.seek(mFileInput.length());
return true;
} catch (FileNotFoundException e) {
Log.e(TAG, "openFile error! " + e);
e.printStackTrace();
} catch (IOException e) {
Log.e(TAG, "openFile error! " + e);
e.printStackTrace();
}
}
return false;
}
private boolean openFile2() {
Log.d(TAG, "openFile2");
if (mFileUri != null && mFileInput2 == null) {
Uri uri = Uri.parse(mFileUri);
try {
Log.d(TAG,
"uri:" + uri.toString() + " getPath:" + uri.getPath()
+ " getEncodedPath:" + uri.getEncodedPath());
FileInputStream fileInputStream = (FileInputStream) getInputStream(uri);
mFileInput2 = fileInputStream.getChannel();
Log.d(TAG, "file size:" + mFileInput2.size());
Log.d(TAG, "file position:" + mFileInput2.position());
Log.d(TAG, "set position:" + mFileInput2.position(100));
Log.d(TAG, "file position:" + mFileInput2.position());
return true;
} catch (FileNotFoundException e) {
e.printStackTrace();
Log.e(TAG, "openFile2 error! " + e);
} catch (IOException e) {
Log.e(TAG, "openFile2 error! " + e);
e.printStackTrace();
}
}
return false;
}
public void runTestCase() {
boolean ret = openFile();
closeFile();
Log.d(TAG, "openFile return " + ret);
ret = openFile2();
closeFile();
Log.d(TAG, "openFile return " + ret);
}
}