如何在 Android 中写入 .txt 文件? [英] How do I write to a .txt file in Android?

问题描述

我有一个需要读取和写入文本文件的应用程序.我有它读，但我没有它写.这个想法是，当我单击屏幕上的保存按钮时，它会将已放入 textviews 的所有信息保存到一个数组中，并将数组的每个段写入文本文件.这是我的写作部分代码:

I have an app that needs to read and write to a text file. I have it reading, but I don't have it writing. The idea is that when I click the save button on the screen, its going to save all the info that has been put into the textviews into an array and the write each segment of the array into the text file. This is my code for the writing portion:

public class AddOrModify extends Activity {

    private Button Savebtn;
    private Button Cancelbtn;
    private EditText NameofRoute;
    private EditText Address1;
    private EditText City1;
    private EditText State1;
    private EditText Zip1;
    private EditText Address2;
    private EditText City2;
    private EditText State2;
    private EditText zip2;




        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.add_or_modify);

            Savebtn = (Button)findViewById(R.id.savebtn);
            Savebtn.setOnClickListener(new btnlistenersave());

            Cancelbtn = (Button)findViewById(R.id.cancelbtn);
            Cancelbtn.setOnClickListener(new btnlistenercancel());

        }

        private class btnlistenersave implements View.OnClickListener{
            public void onClick(View v) {

                NameofRoute = (EditText)findViewById(R.id.NameofRoute);
                Address1 = (EditText)findViewById(R.id.editAddress1);
                City1 = (EditText)findViewById(R.id.City1);
                State1= (EditText)findViewById(R.id.State1);
                Zip1 = (EditText)findViewById(R.id.Zip1);
                Address2= (EditText)findViewById(R.id.Address2);
                City2 = (EditText)findViewById(R.id.City2);
                State2 = (EditText)findViewById(R.id.State2);
                zip2 = (EditText)findViewById(R.id.Zip2);

                //String[] mySettings ={NameofRouteinput,Address1input,City1input, State1input,Zip1input,Address2input,City2input,State2input,Zip2input,";"};


               // if(mySettings != null){ 
                try{

                    String NameofRouteinput = NameofRoute.getText().toString();
                    String Address1input = Address1.getText().toString();
                    String City1input = City1.getText().toString();
                    String State1input=State1.getText().toString();
                    String Zip1input = Zip1.getText().toString();
                    String Address2input =Address2.getText().toString();
                    String City2input = City2.getText().toString();
                    String State2input = State2.getText().toString();
                    String Zip2input= zip2.getText().toString();
                    OutputStreamWriter out = new OutputStreamWriter(openFileOutput("myaddress.txt",0));

                    String[] mySettings ={NameofRouteinput,Address1input,City1input, State1input,Zip1input,Address2input,City2input,State2input,Zip2input,";"};


                    for(int i =0; i < mySettings.length; i++)
                    out.write(mySettings[i]);
                    out.close();
                }
                catch (java.io.IOException e){

                }


                Intent i = new Intent(AddOrModify.this, Frontpage.class);
                startActivity(i);

            }

        }

        private class btnlistenercancel implements View.OnClickListener{

            public void onClick(View v) {
                Intent i = new Intent(AddOrModify.this, Frontpage.class);
                startActivity(i);
            }

        }

}

推荐答案

我得到了 mari 的解决方案

with mari's solution i was getting

       java.lang.IllegalArgumentException: contains a path separator

然后我尝试了以下，它对我有用

then i tried following and it worked for me

  File root = new File(DIRECTORY_PATH);
  File gpxfile = new File(root, "samples.txt");
  FileWriter writer = new FileWriter(gpxfile);
  writer.append("First string is here to be written.");
  writer.flush();
  writer.close();

你可以循环写多行

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