Android內部File文件緩存

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;


import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class MainActivity extends Activity {


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


private void init() {
final EditText editText=(EditText) findViewById(R.id.editText1);
final TextView textView = (TextView) findViewById(R.id.textView1);
Button save=(Button) findViewById(R.id.save);
Button delete=(Button) findViewById(R.id.delete);

save.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
String str = editText.getText().toString().trim();
saveFile(str, "data.txt");

textView.setText(str);
}
});


}


private void saveFile(String str, String filename) {
FileOutputStream fos;   
 
try {
fos = this.openFileOutput(filename, Activity.MODE_PRIVATE);    
fos.write(str.getBytes());    
fos.flush();   
fos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}   
}
}