创建一个文本文件并在android中保存数据

Question

我是Android应用程序编程的新手。

在下面的代码中，我想通过一些EditTexts从用户那里获取输入，然后将它们保存到一个文件中。我使用android studio并在输入后，检查了文件，它总是空的。我尝试显示内容仍然没有输出。代码有什么问题？

请帮帮我。

public class user extends Activity {

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

    nextClick();
}

public void nextClick()
{
    final Context context = this;
    Button next =(Button) findViewById(R.id.userNext);
    next.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View v) {
           try {
               EditText e1 = (EditText) findViewById(R.id.name);
               EditText e2 = (EditText) findViewById(R.id.designation);
               EditText e3 = (EditText) findViewById(R.id.orgname);
               EditText e4 = (EditText) findViewById(R.id.address);
               EditText e5 = (EditText) findViewById(R.id.city);
               EditText e6 = (EditText) findViewById(R.id.state);
               EditText e7 = (EditText) findViewById(R.id.zip);
               FileOutputStream fos = openFileOutput("data.txt", Context.MODE_WORLD_WRITEABLE);
               OutputStreamWriter osw = new OutputStreamWriter(fos);

               osw.write(e1.toString());

               fos.flush();
               fos.close();
           }
           catch(Exception e) {
           }
            try
                  {
              FileInputStream fis = new FileInputStream("data.txt");

               while(fis.read()!=-1)
               {
                   System.out.println((char)fis.read());
               }

           }
           catch(Exception e)
           {

           }
           Intent intent3 = new Intent(context,com.example.cheruvu.rs.user2.class);
           startActivity(intent3);
       }
   });
}

}

Answer 1

在您写入文件时，您需要从 EditText 字段 getText（），如下所示

POST /test_index/_search { "query": { "filtered": { "query": { "term": { "name": { "value": "b" } } }, "filter": { "limit": { "value": 2 } } } }, "aggs": { "val_sum": { "sum": { "field": "val" } } } } ... { "took": 2, "timed_out": false, "_shards": { "total": 1, "successful": 1, "failed": 0 }, "hits": { "total": 2, "max_score": 0.73895097, "hits": [ { "_index": "test_index", "_type": "doc", "_id": "2", "_score": 0.73895097, "_source": { "name": "a b", "val": 2 } }, { "_index": "test_index", "_type": "doc", "_id": "4", "_score": 0.73895097, "_source": { "name": "b a", "val": 4 } } ] }, "aggregations": { "val_sum": { "value": 6, "value_as_string": "6.0" } } }

Answer 2

这个怎么样？这将在手机上创建文件（而不是SD卡）

File myFile = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "MyFileName");
FileOutpuStream fos = new FileOutputStream(myFile);

Answer 3

尝试用此替换您的代码，看看它是否有效

public class user extends Activity {

EditText e1;
EditText e2;
EditText e3;
EditText e4;
EditText e5;
EditText e6; 
EditText e7; 

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

    e1 = (EditText) findViewById(R.id.name);
    e2 = (EditText) findViewById(R.id.designation);
    e3 = (EditText) findViewById(R.id.orgname);
    e4 = (EditText) findViewById(R.id.address);
    e5 = (EditText) findViewById(R.id.city);
    e6 = (EditText) findViewById(R.id.state);
    e7 = (EditText) findViewById(R.id.zip);

    nextClick();
}

public void nextClick()
{
    final Context context = this;
    Button next =(Button) findViewById(R.id.userNext);
    next.setOnClickListener(new View.OnClickListener() {
       @Override
       public void onClick(View v) {
           try {

               FileOutputStream fos = openFileOutput("data.txt", Context.MODE_WORLD_WRITEABLE);
               OutputStreamWriter osw = new OutputStreamWriter(fos);

               osw.write(e1.getText().toString());

               fos.flush();
               fos.close();
           }
           catch(Exception e) {
           }
            try
                  {
              FileInputStream fis = new FileInputStream("data.txt");

               while(fis.read()!=-1)
               {
                   System.out.println((char)fis.read());
               }

           }
           catch(Exception e)
           {

           }
           Intent intent3 = new Intent(context,com.example.cheruvu.rs.user2.class);
           startActivity(intent3);
       }
   });
}

}