新值EditText未显示，没有任何错误 [英] New Value EditText not being displayed , no errors whatsoever
问题描述
顺便说一句，如果我在范围内将edt4.setText("any text")硬编码，它将显示值
EDIT : By the way , if i hard code edt4.setText("any text") IN THE SCOPE , it shows the value
尝试重建/清理项目，这可能是settext方法中的错误，看起来好像im做得对.当我用settext查看其他代码时
tried rebuilding/cleaning project , could this be a bug in settext method, it looks like im doing it right . When i look at other code with settext
startactivityforresult可能是我的答案? ，我提出了与我想尝试的问题有关的另一个问题，我仍然没有找到另一个解决方案，坚持了一周了:( 这是我的问题的链接我可以将startActivityForResult与一项活动一起使用吗?
startactivityforresult might be my answer ? , i openend another question related to what i wanna try out , i still havent found another solution , stuck with this for a week now : ( this is the link to my question Can i use startActivityForResult , with one activity?
现在尝试使视图可见和不可见
EDIT4 : now trying it with making views visible and invisible
我已经阅读了每一篇有关stackoverflow，dreamincode等相关内容的文章，但找不到任何知道我问题答案的人.
I have read every single article about anything related on stackoverflow , dreamincode etc, and i cant find anybody that knows the answer for my problem.
我有一个qr扫描仪，成功扫描后，需要将结果放入名称为editText4的EDIT TEXT字段中，我的代码未引发任何错误，但未显示任何值.
I have a qr scanner and after a successful scan the result needs to be put in a EDIT TEXT field with name editText4 , my code throws no errors but it is NOT displaying any value .
I've posted on different forums but to no avail (https://www.dreamincode.net/forums/topic/412000-settext-is-not-showing-set-value-in-edittext-in-gui/page__st__15__gopid__2372214&#entry2372214) , as you can see the commented code . That's pretty much also what I've tried , I think I somehow got to get my handle result method inside of the scope.
注意:Log.v可以很好地输出结果，但是当我尝试执行其他任何操作时，结果将无法正常显示或显示
NOTE : Log.v outputs the result very well , but when i try anything else with the result it just don't works or being displayed
ps:我是Java的初学者
ps: I m beginner at java
感谢您的帮助
这是我的主要活动
` public class MainActivity extends Activity implements
ZXingScannerView.ResultHandler {
Button sendButton;
EditText edt4;
EditText edt2;
private ZXingScannerView mScannerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edt4 = findViewById(R.id.editText4);
mScannerView = findViewById(xmlScannerView);
mScannerView.setFormats(ZXingScannerView.ALL_FORMATS);
mScannerView.setResultHandler(this);
mScannerView.startCamera();
EditText delete2;
Button button3;
button3 = findViewById(R.id.button3);
delete2 = findViewById(R.id.editText2);
final EditText finalEdittext = delete2;
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Clear EditText
finalEdittext.getText().clear();
}
});
EditText delete4;
Button button4;
delete4 = findViewById(editText4);
button4 = findViewById(R.id.button4);
final EditText finalEdittext1 = delete4;
button4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Clear EditText
finalEdittext1.getText().clear();
}
});
}
@Override
public void onPause() {
super.onPause();
mScannerView.stopCamera(); // Stop camera on pause
}
public void onClick(View v){
RelativeLayout someid = findViewById(R.id.someId);
mScannerView.setVisibility(View.VISIBLE);
someid.setVisibility(View.INVISIBLE);
}
// EditText edt4;
@Override
public void handleResult(final Result result) {
//handle result
Log.v("handleResult", result.getText());
edt4 = findViewById(editText4);
edt4.setText(result.getText());
//edt4.setText(String.valueOf(result.getText()));
// edt4.setText(new
StringBuilder().append("Resultaat:").append(result.getText()).toString());
}
`
这是xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:background="@mipmap/ic_launcher_foreground">
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true">
<me.dm7.barcodescanner.zxing.ZXingScannerView
android:id="@+id/xmlScannerView"
android:visibility="gone"
android:layout_height="match_parent"
android:layout_width="match_parent" />
<RelativeLayout
android:id="@+id/someId"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/editText4"
android:layout_width="match_parent"
android:layout_height="62dp"
android:layout_marginTop="67dp"
android:ems="10"
android:hint="@string/scan_locatie"
android:inputType="text"
android:text=""
tools:backgroundTint="@android:color/holo_red_light" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/editText4"
android:layout_centerHorizontal="true"
android:background="@android:color/holo_red_light"
android:onClick="onClick"
android:text="@string/scan_qr"
tools:text="scan qr code" />
<EditText
android:id="@+id/editText2"
android:layout_width="match_parent"
android:layout_height="61dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:layout_marginTop="197dp"
android:ems="10"
android:hint="@string/scan_order"
android:inputType=""
android:visibility="visible"
tools:backgroundTint="@android:color/holo_red_light" />
<Button
android:id="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/editText2"
android:layout_centerHorizontal="true"
android:background="@android:color/holo_red_light"
android:onClick="onClick"
android:text="@string/scan_qr"
tools:text="scan qr code" />
<Button
android:id="@+id/sendButton"
android:layout_width="157dp"
android:layout_height="32dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="72dp"
android:background="@android:color/holo_red_light"
android:text="@string/button"
tools:text="Versturen.." />
<Button
android:id="@+id/button3"
android:layout_width="40dp"
android:layout_height="38dp"
android:layout_alignBaseline="@+id/editText2"
android:layout_alignParentEnd="true"
android:background="@android:drawable/ic_delete" />
<Button
android:id="@+id/button4"
android:layout_width="39dp"
android:layout_height="37dp"
android:layout_alignBaseline="@+id/editText4"
android:layout_alignParentEnd="true"
android:background="@android:drawable/ic_delete" />
</RelativeLayout>
5还更改了XML，并且main仍然不起作用:(
5 also changed XML , and main , still not working :(
推荐答案
我仍然认为result.getText()是String，因此您可以更改以下行:
I think result.getText() is a String anyway, so you could change the following line:
edt4.setText(String.valueOf(result.getText()));
收件人:
edt4.setText(result.getText());
此后，您调用updateScannerData，它也会再次从UI-Thread写入EditText.我建议也删除UI-Thread代码，因为我假设代码仍然在Thread上运行.
After that you call updateScannerData, which is also writing to the EditText once again, but from the UI-Thread. I would recommend to remove the UI-Thread code as well since I assume the code runs on that Thread anyway.
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