Android FileInputStream 、 FileOutputStream运用
package com.example.file;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.http.util.EncodingUtils;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.os.Bundle;
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 {
private static final String FILE_NAME="file_out.txt";
Button mButton1,mButton2;
EditText mEditText;
TextView mTextView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mButton1=(Button)findViewById(R.id.button1);
mButton2=(Button)findViewById(R.id.button2);
mEditText=(EditText)findViewById(R.id.editText1);
mTextView=(TextView)findViewById(R.id.textView1);
mButton2.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
try {
FileInputStream fileInputStream=openFileInput(FILE_NAME);
byte[] buffer=new byte[1024];
fileInputStream.read(buffer);
String filecontentString=EncodingUtils.getString(buffer, "UTF-8");
mTextView.setText(filecontentString);
mTextView.setTextColor(Color.YELLOW);
}
catch (Exception e) {
// TODO: handle exception
}
}
});
mButton1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
try {
//追加保存
FileOutputStream fileOutputStream=openFileOutput(FILE_NAME, Context.MODE_APPEND);
String inputfilecontent=mEditText.getText().toString();
fileOutputStream.write(inputfilecontent.getBytes());
fileOutputStream.close();
}
catch (Exception e) {
// TODO: handle exception
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
补充:移动开发 , Android ,