package com.example.backupmanager;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import android.app.Activity;
import android.app.backup.BackupManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioGroup;
public class BackupManagerExample extends Activity {
static final String TAG = "BRActivity";
static final Object[] sDataLock = new Object[0];
static final String DATA_FILE_NAME = "saved_data";
RadioGroup mFillingGroup;
CheckBox mAddMayoCheckbox;
CheckBox mAddTomatoCheckbox;
File mDataFile;
BackupManager mBackupManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.backup_restore);
mFillingGroup = (RadioGroup) findViewById(R.id.filling_group);
mAddMayoCheckbox = (CheckBox) findViewById(R.id.mayo);
mAddTomatoCheckbox = (CheckBox) findViewById(R.id.tomato);
mDataFile = new File(getFilesDir(), BackupManagerExample.DATA_FILE_NAME);
mBackupManager = new BackupManager(this);
populateUI();
}
void populateUI() {
RandomAccessFile file;
int whichFilling = R.id.pastrami;
boolean addMayo = false;
boolean addTomato = false;
synchronized (BackupManagerExample.sDataLock) {
boolean exists = mDataFile.exists();
try {
file = new RandomAccessFile(mDataFile, "rw");
if (exists) {
Log.v(TAG, "datafile exists");
whichFilling = file.readInt();
addMayo = file.readBoolean();
addTomato = file.readBoolean();
Log.v(TAG, " mayo=" + addMayo + " tomato=" + addTomato
+ " filling=" + whichFilling);
} else {
Log.v(TAG, "creating default datafile");
writeDataToFileLocked(file, addMayo, addTomato,
whichFilling);
mBackupManager.dataChanged();
}
} catch (IOException ioe) {
// Do some error handling here!
}
}
mFillingGroup.check(whichFilling);
mAddMayoCheckbox.setChecked(addMayo);
mAddTomatoCheckbox.setChecked(addTomato);
mFillingGroup
.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
public void onCheckedChanged(RadioGroup group, int checkedId) {
Log.v(TAG, "New radio item selected: " + checkedId);
recordNewUIState();
}
});
CompoundButton.OnCheckedChangeListener checkListener = new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
Log.v(TAG, "Checkbox toggled: " + buttonView);
recordNewUIState();
}
};
mAddMayoCheckbox.setOnCheckedChangeListener(checkListener);
mAddTomatoCheckbox.setOnCheckedChangeListener(checkListener);
}
void writeDataToFileLocked(RandomAccessFile file, boolean addMayo,
boolean addTomato, int whichFilling) throws IOException {
file.setLength(0L);
file.writeInt(whichFilling);
file.writeBoolean(addMayo);
file.writeBoolean(addTomato);
Log.v(TAG, "NEW STATE: mayo=" + addMayo
+ " tomato=" + addTomato + " filling=" + whichFilling);
}
void recordNewUIState() {
boolean addMayo = mAddMayoCheckbox.isChecked();
boolean addTomato = mAddTomatoCheckbox.isChecked();
int whichFilling = mFillingGroup.getCheckedRadioButtonId();
try {
synchronized (BackupManagerExample.sDataLock) {
RandomAccessFile file = new RandomAccessFile(mDataFile, "rw");
writeDataToFileLocked(file, addMayo, addTomato, whichFilling);
}
} catch (IOException e) {
Log.e(TAG, "Unable to record new UI state");
}
mBackupManager.dataChanged();
}
}