我的应用程序答案是数组0并将所有内容组合在一起

Question

我们已经尝试了您的解决方案，它可以很好地工作，但是所有答案都归功于数组0并将所有内容组合在一起，所以您可以解决该问题

我将其用于收集用户的数据

public class profile extends AppCompatActivity {
EditText name1 , surname1 , idnumber1;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_profile);
    name1 = (EditText)findViewById(R.id.name);
    surname1 = (EditText)findViewById(R.id.surname);
    idnumber1 = (EditText)findViewById(R.id.Idnumber);
}
public void save(View view){

    String name2 = name1.getText().toString();
    String surname2 = surname1.getText().toString();
    String idnumber2 = idnumber1.getText().toString();
    File  file = null;
    name2 = name2+"";
    surname2 = surname2+"";

    FileOutputStream fileOutputStream = null;

    try {
        file = getFilesDir();
        fileOutputStream = openFileOutput("Rank It Up.txt" , Context.MODE_PRIVATE);
        fileOutputStream.write(name2.getBytes());
        fileOutputStream.write(surname2.getBytes());
        fileOutputStream.write(idnumber2.getBytes());

    } catch (IOException e) {
        Log.d("Rank It Up", e.toString());
    }
   finally {
        try {
            fileOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    Toast.makeText(this, "Save successfully"+file+"/Rank It Up.txt", Toast.LENGTH_LONG).show();
}
public void next(View view){
    Toast.makeText(this, "Database page",Toast.LENGTH_LONG).show();
    Intent intent = new Intent(this, DBActivity.class);
    startActivity(intent);

}

}

，然后将其用于从用户收集的显示数据

public class DBActivity extends AppCompatActivity {
TextView name1 , surname1 , idnumber1;
@Override
protected  void  onCreate(Bundle saveInstanceState){
    super.onCreate(saveInstanceState);
    setContentView(R.layout.activity_db);
    name1 = (TextView)findViewById(R.id.name);
    surname1 = (TextView)findViewById(R.id.surname);
    idnumber1 = (TextView)findViewById(R.id.idnumber);
}

public void show(View view){

    try {
        FileInputStream fileInputStream = openFileInput("Rank It Up.txt");
        int read = -1;
        StringBuffer buffer = new StringBuffer();
        while ((read=fileInputStream.read()) != -1)
        {
            buffer.append((char) read);
        }

        Log.d("Rank It Up",buffer.toString());
        String m = buffer.toString();
        String[] data = m.split(" ");
        String[] data = m.split(" ");
         String name2 = (data.length > 0) ? data[0] : "";
     String surname2 = (data.length > 1) ? data[1] : "";
     String idnumber2 = (data.length > 2) ? data[2] : "";
        name1.setText(name2);
        surname1.setText(surname2);
        idnumber1.setText(idnumber2);

    } catch (FileNotFoundException e) {
        Toast.makeText(this, "File Not Found", Toast.LENGTH_LONG).show();

    } catch (IOException e){
        e.printStackTrace();
    }
    Toast.makeText(this, "Data found", Toast.LENGTH_LONG).show();
}
public void back(View view){
    Toast.makeText(this, "Main page",Toast.LENGTH_LONG).show();
    Intent intent = new Intent(this, profile.class);
    startActivity(intent);
}

问题是为什么所有数据都在单行上显示

在此处输入图像描述

Answer 1

显然，您的数据存在问题。它可能不包含空格，因此当您用空格拆分时，只能获得1个值。检查，您将在拆分调用后立即看到数据阵列的长度1。但是您无法发现此错误，因为您有以下代码：

String name2 = (data.length > 0) ? data[0] : "";
String surname2 = (data.length > 1) ? data[1] : "";
String idnumber2 = (data.length > 2) ? data[2] : "";

此代码填充了那些空位，尽管它可以防止您的应用程序崩溃，但它也会使您不了解问题在哪里。