我有一个基本的患者详细信息活动，它获取患者详细信息并将其保存到文本文件中。目前，只有从编辑文本字段接收到的输入是来自编辑文本的提示，而不是我试图输入的实际信息，它才能正常工作。我的代码对我来说似乎很完美，我看不出哪里出了问题：
public class PatientDetails extends AppCompatActivity {
public EditText IDNum, name, DOB, weight, height;
public String ID, dob, wght, hght, nme;
public Button b;
public TextView t;
private FileUtility myFile = new FileUtility();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_patient_details);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
IDNum = ((EditText) findViewById(R.id.IDnum));
DOB = ((EditText) findViewById(R.id.DOB));
weight = ((EditText) findViewById(R.id.Weight));
height = ((EditText) findViewById(R.id.Height));
name = ((EditText) findViewById(R.id.name));
b = ((Button) findViewById(R.id.submit));
t = ((TextView) findViewById(R.id.result));
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
ID = IDNum.getText().toString();
dob = DOB.getText().toString();
wght = weight.getText().toString();
hght = height.getText().toString();
nme = name.getText().toString();
myFile.createFile(getApplicationContext(), "test");
myFile.writeLine(ID);
myFile.writeLine(dob);
myFile.writeLine(wght);
myFile.writeLine(hght);
myFile.writeLine(nme);
t.setText(myFile.readAll());
}
});
}
}
xml代码：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:showIn="@layout/activity_patient_details"
tools:context="com.example.user.filetest.PatientDetails">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textPersonName"
android:hint="Name"
android:ems="10"
android:id="@+id/name"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="@+id/IDnum"
android:layout_below="@+id/name"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:hint="Patient ID number" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="@+id/Height"
android:layout_below="@+id/IDnum"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:hint="Height"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="@+id/Weight"
android:hint="Weight"
android:layout_below="@+id/Height"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="date"
android:ems="10"
android:id="@+id/DOB"
android:layout_below="@+id/Weight"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:hint="DOB" />
<Button
android:hint="Submit"
android:id="@+id/submit"
android:layout_width="300dp"
android:layout_height="70dp"
android:layout_below="@+id/DOB"
android:layout_centerHorizontal="true"
android:layout_marginTop="70dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:id="@+id/result"
android:layout_below="@+id/submit"
android:layout_marginTop="53dp"
android:layout_alignLeft="@+id/submit"
android:layout_alignStart="@+id/submit"
android:layout_alignRight="@+id/submit"
android:layout_alignEnd="@+id/submit"
android:textSize="7dp" />
/////文件实用程序///////
public class FileUtility {
private File root;
private File file;
public FileUtility() {
root = Environment.getExternalStorageDirectory();
}
public void createFile(Context context, String fileName) {
try {
if (root.canWrite()) {
file = new File(root, "//" + fileName);
if (!file.exists()) {
file.createNewFile();
}
}
else
{
file = new File(context.getFilesDir(), "//" + fileName); // File(root, "//" + fileName);
if (!file.exists()) {
file.createNewFile();
}
}
} catch (IOException e) {
Log.e("Error", "fail to create a new file");
}
}
public String readAll() {
StringBuilder returnString = new StringBuilder();
try {
BufferedReader in;
FileReader datawriter = new FileReader(file);
in = new BufferedReader(datawriter);
if (file.exists()) {
String str = null;
while((str=in.readLine())!=null)
{
returnString.append(str + "n");
}
}
in.close();
} catch (IOException e) {
Log.e("Error", "fail to write file");
}
return returnString.toString();
}
public void writeLine(String message) {
try {
BufferedWriter out;
FileWriter datawriter = new FileWriter(file,true);
out = new BufferedWriter(datawriter);
if (file.exists()) {
out.write(message + "n");
out.flush();
}
out.close();
} catch (IOException e) {
Log.e("Error", "fail to write file");
}
}
}
尝试再次搜索代码。无法从getText（）方法获取提示文本。。。除非您在EditText元素中将该提示硬预填充为文本。
也许试试这个：
IDNum = (EditText) findViewById(R.id.IDnum);