我在android上制作了一个表单。在检查文本字段时，我使用isEmpty（）方法检查是否有任何文本。问题是，它总是返回真实。我无法弄清楚我哪里出错了。提前致谢！ :)
如果需要任何其他文件，请在此处发表评论，我会尽快添加。
AddQuestionActivity.java
import static chipset.quizzy.questionadder.resources.Constants.KEY_QUESTION;
import static chipset.quizzy.questionadder.resources.Constants.KEY_QUESTION_ANSWER;
import static chipset.quizzy.questionadder.resources.Constants.KEY_QUESTION_HINT;
import static chipset.quizzy.questionadder.resources.Constants.KEY_QUESTION_NUMBER;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import chipset.quizzy.questionadder.R;
import chipset.quizzy.questionadder.resources.Functions;
import chipset.quizzy.questionadder.resources.ShowImageActivity;
public class AddQuestionActivity extends Activity {
Functions functions = new Functions();
EditText addQuestionNumber, addQuestion, addQuestionAnswer,
addQuestionHint;
Button addQuestionImage, addQuestionAdd;
ImageView addQuestionImageView;
private static int RESULT_LOAD_IMAGE = 1;
String picturePath, question, questionNumber, questionAnswer, questionHint;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_question);
getActionBar().setHomeButtonEnabled(true);
getActionBar().setDisplayHomeAsUpEnabled(true);
addQuestionNumber = (EditText) findViewById(R.id.addQuestionNumber);
addQuestion = (EditText) findViewById(R.id.addQuestion);
addQuestionAnswer = (EditText) findViewById(R.id.addQuestionAnswer);
addQuestionHint = (EditText) findViewById(R.id.addQuestionHint);
addQuestionImage = (Button) findViewById(R.id.addQuestionImage);
addQuestionImageView = (ImageView) findViewById(R.id.addQuestionImageView);
addQuestionAdd = (Button) findViewById(R.id.addQuestionAdd);
questionNumber = addQuestionNumber.getText().toString().trim();
question = addQuestion.getText().toString().trim();
questionAnswer = addQuestionAnswer.getText().toString().trim();
questionHint = addQuestionHint.getText().toString().trim();
addQuestionAdd.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
functions.hideKeyboard(getApplicationContext(),
getCurrentFocus());
if (functions.isConnected(getApplicationContext())) {
if (questionNumber.isEmpty() || question.isEmpty()
|| questionAnswer.isEmpty()
|| questionHint.isEmpty()) {
Toast.makeText(getApplicationContext(),
"Enter All Fields", Toast.LENGTH_SHORT).show();
Log.i(KEY_QUESTION, String.valueOf(question.isEmpty()));
Log.i(KEY_QUESTION_ANSWER,
String.valueOf(questionAnswer.isEmpty()));
Log.i(KEY_QUESTION_HINT,
String.valueOf(questionHint.isEmpty()));
Log.i(KEY_QUESTION_NUMBER,
String.valueOf(questionNumber.isEmpty()));
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(
AddQuestionActivity.this);
builder.setTitle("Information");
builder.setMessage(KEY_QUESTION_NUMBER + " : "
+ questionNumber + "\n" + KEY_QUESTION + " : "
+ question + "\n" + KEY_QUESTION_ANSWER + " : "
+ questionAnswer + "\n" + KEY_QUESTION_HINT
+ " : " + questionHint + "\n");
builder.setNeutralButton(android.R.string.ok, null);
builder.create();
builder.show();
}
} else {
Toast.makeText(getApplicationContext(),
"No Internet Connection", Toast.LENGTH_SHORT)
.show();
}
}
});
addQuestionImage.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent addImage = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(addImage, RESULT_LOAD_IMAGE);
}
});
addQuestionImageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent loadBigImage = new Intent(getApplication(),
ShowImageActivity.class);
loadBigImage.putExtra("picturePath", picturePath);
startActivity(loadBigImage);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK
&& null != data) {
Uri selectedImage = data.getData();
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = getContentResolver().query(selectedImage,
filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
picturePath = cursor.getString(columnIndex);
cursor.close();
addQuestionImageView.setVisibility(View.VISIBLE);
addQuestionImageView.setImageBitmap(BitmapFactory
.decodeFile(picturePath));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_logout) {
functions.logout(getApplication(), getApplicationContext());
} else if (id == android.R.id.home) {
onBackPressed();
}
return super.onOptionsItemSelected(item);
}
}
的 activity_add_question.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/turquoize" >
<TextView
android:id="@+id/addTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp"
android:fontFamily="sans-serif-light"
android:gravity="center_horizontal|center_vertical"
android:text="@string/app_name"
android:textColor="@color/clouds"
android:textSize="30sp" />
<ScrollView
android:id="@+id/boxy"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/addTitle"
android:layout_margin="15dp"
android:background="@color/clouds"
android:orientation="vertical"
android:padding="15dp"
tools:ignore="UselessLeaf" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<EditText
android:id="@+id/addQuestionNumber"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/qNo"
android:inputType="number" />
<EditText
android:id="@+id/addQuestion"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/q"
android:inputType="textMultiLine" />
<EditText
android:id="@+id/addQuestionAnswer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/qAns"
android:inputType="text" />
<EditText
android:id="@+id/addQuestionHint"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="@string/qHint"
android:inputType="text" />
<Button
android:id="@+id/addQuestionImage"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:background="@drawable/button_click"
android:text="@string/uQImage"
android:textColor="@color/turquoize" />
<ImageView
android:id="@+id/addQuestionImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_marginTop="15dp"
android:background="@color/black"
android:contentDescription="@string/qImage"
android:visibility="gone" />
</LinearLayout>
</ScrollView>
<Button
android:id="@+id/addQuestionAdd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_margin="15dp"
android:background="@drawable/button_click"
android:text="@string/addQuestionDo"
android:textColor="@color/turquoize" />
</RelativeLayout>
答案 0 :(得分：1)
您需要在Button onClick(...)事件
questionNumber = addQuestionNumber.getText().toString().trim();
question = addQuestion.getText().toString().trim();
questionAnswer = addQuestionAnswer.getText().toString().trim();
questionHint = addQuestionHint.getText().toString().trim();
就像这样
addQuestionAdd.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
questionNumber = addQuestionNumber.getText().toString().trim();
question = addQuestion.getText().toString().trim();
questionAnswer = addQuestionAnswer.getText().toString().trim();
questionHint = addQuestionHint.getText().toString().trim();
...........
.............
}
});
答案 1 :(得分：0)
这是因为，在onCreate阶段本身，您将获取文本框的值并将其存储在变量中。最初，文本框将为空，因此该值也将为空。
因此，修改onclick Listener代码，以便在代码中获取文本框值，然后对其进行处理。但是，还要在onclicklistener中检查空字符串，因为用户可能没有向文本框输入任何值。 ：）
//可以在onCreate
中声明编辑文本实例protected void onCreate(Bundle savedInstanceState)
{
....
addQuestionNumber = (EditText) findViewById(R.id.addQuestionNumber);
addQuestion = (EditText) findViewById(R.id.addQuestion);
addQuestionAnswer = (EditText) findViewById(R.id.addQuestionAnswer);
addQuestionHint = (EditText) findViewById(R.id.addQuestionHint);
....
}
//编辑文本值获取应位于onClick
public void onClick(View v) {
questionNumber = addQuestionNumber.getText().toString().trim();
question = addQuestion.getText().toString().trim();
questionAnswer = addQuestionAnswer.getText().toString().trim();
questionHint = addQuestionHint.getText().toString().trim();
...
}