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저는 sdk에 익숙해지기 위해 간단한 안드로이드 응용 프로그램을 작성하려고하는데 setText 메서드가 TextView를 변경하지 않는 이유를 알 수 없습니다. 기본적으로 내가 원하는 것은 사용자가 문자열을 입력하고, 사용자가 문자열에서 실행할 메소드를 선택하고 Textview로 출력을 설정하게하지만 TextView를 설정할 수없는 것입니다. onCreate에서 메서드를 호출하려고 시도했습니다. case에서 전환하고 각 경우에 하나도 출력 값으로 텍스트를 설정하지 않았습니다. 아무도 내가 뭘 잘못하고 있는지 알아?안드로이드 setText 메서드가 TextView에 텍스트를 설정하지 않았습니다.
package com.example.firstapp;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class TextChange extends Activity implements OnClickListener{
Button findUpperCase, everyOther, vowelReplace, vowelCount;
EditText input;
TextView output;
String inputText, outputText;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.textchanger);
initializeVar();
output.setText(outputText);
}
public void initializeVar(){
findUpperCase = (Button) findViewById(R.id.finduppercase);
everyOther = (Button) findViewById(R.id.everyother);
vowelReplace = (Button) findViewById(R.id.vreplace);
vowelCount = (Button) findViewById(R.id.vcount);
input = (EditText) findViewById(R.id.stringinput);
output = (TextView) findViewById(R.id.output);
}
public static String findUpperCase(String x){
//Initialize output value
String output = "";
//For loop to loop through each character of the string
for (int i = 0; i <= x.length()-1; i++)
{
//Convert letter to char value and compare it to the ASCII values for capital letters
if (Character.isUpperCase(x.charAt(i)))
{
//Add each capital letter to the output string
output += x.substring(i, i+1) + " ";
}
}
//If not uppercase letters tell user
if (output.equals("")){
output = "No upper case characters";
}
//Return the capital letters or message to user and exit method
return output;
}
//Method used to get every other letter
public static String everyOther(String x){
//Set initial value of output
String output = "";
//Use for loop to get every other character by incrementing i by 2 each time
for(int i=0; i<=x.length() - 1; i+=2){
//Set letter equal to a temperary holder
char temp = x.charAt(i);
//If it is the first letter add to output without a space preceeding it
if (i == 0){
//New output is set as the old output plus the temp value without a space
output = output + temp;
}
//If it is not the first letter do this
else{
//New output is set as the old output plus the temp value with a space
output = output + " " + temp;
}
}
//Return the output
return output;
}
//Method to replace the vowel with "_"
public static String vowelReplace(String x){
//Search each string for vowels and ignore the case, when found replace with a "_"
String output = x.replaceAll("(?i)[aeiou]","_");
//Return the output
return output;
}
//Method to count the vowels
public static int vowelCount(String x){
//Set a counter
int count = 0;
//Set an array of char characters containing all the letters
char vowels[] = {'a','e','i','o','u','A','E','I','O','U'};
//For loop to check each letter for vowels
for (int i = 0; i <= x.length() - 1; i++){
//For loop to check each character against values in vowels array
for(int z = 0; z <= 9; z++){
//If a vowel is found increment the count
if (x.charAt(i) == vowels[z]){
//Increment the count
count++;
}
}
}
//Return the number of vowels
return count;
}
//Method to identify the vowel positions
public static String vowelPositions(String x){
//Initialize an output variable
String output = "";
//Set a temp string variable
String values = "";
//Set an array of char characters containing all the letters
char vowels[] = {'a','e','i','o','u','A','E','I','O','U'};
//For loop to check each letter for vowels
for(int z = 0; z < x.length(); z++){
//For loop to check each character against values in vowels array
for (int i = 0; i <= 9; i++){
//Check if each character is equal to any value in the array value
if (x.charAt(z) == vowels[i]){
//If it is the first vowel found do not add a space before adding to output
if(output.equals("")){
//Set first value of output
output = "[" + z + "]";
}
else{
//Add each position of the vowels to the output string
values = " [" + z + "]";
//Set new value of outputs to old value plus the value of values
output = output + values;
}
}
}
}
//Return the location of the vowels
return "Vowels are located at the following indexes:" + output;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
inputText = input.getText().toString();
switch(v.getId()){
case R.id.finduppercase:
outputText = findUpperCase(inputText);
break;
case R.id.everyother:
outputText = everyOther(inputText);
break;
case R.id.vcount:
outputText=Integer.toString(vowelCount(inputText));
break;
case R.id.vpos:
outputText = vowelPositions(inputText);
break;
case R.id.vreplace:
outputText = vowelReplace(inputText);
break;
}
}
}
TextView가 실제로 표시되었는지 확인 했습니까? TextView에서 getText를 호출하면 텍스트를 다시 인쇄 할 수 있습니까? – 2Dee
onClick의 setText를 호출하십시오. – Manishika
필자가 볼 수있는 한,'setText()'만'onCreate()'에 한 번만 호출합니다. – Simon