ユーザーが無効な番号を入力した場合は、2つのTextView
がテキストを変更する必要があります。
TextView
と同じidを持つ人が見つかった場合は、私はTextView
の各IDが一意であるということを調べました。なぜ私のTextViewsはnullですか?
毎回、無効な番号を入力するとエラーが発生し、アプリがクラッシュします。私がデバッグでアプリケーションを起動し、私の2つの "問題のあるコード"をマークした場合。結果はTextView
であり、null
であった。
IDが一意で、現在のレイアウトが変更されないため、なぜこのようなことが起こるのかわかりません。
私のJavaコード:
public void checkingInput(View view) {
TextView eKnowledge = (TextView) findViewById(R.id.enterKnowledge);
try{
int inputNumber = Integer.parseInt(eKnowledge.getText().toString());
_knowledge = KnowledgeLevel.fromUserInput(inputNumber);
test();
hideKeyboard(view);
} catch(NumberFormatException e){
errorKnowledge();
hideKeyboard(view);
}
}
@SuppressLint("SetTextI18n")
public void test() {
setContentView(R.layout.test);
TextView test = (TextView) findViewById(R.id.textView_nur_einmal_benutzt_hoff_ich);
switch(_knowledge) {
case NOOB:
test.setText("ENUM = NOOB");
break;
case BEGINNER:
test.setText("ENUM = BEGINNER");
break;
case ADVANCED:
test.setText("ENUM = ADV");
break;
case PRO:
test.setText("ENUM = PRO");
break;
case GRANDMASTER:
test.setText("ENUM = GM");
break;
case ERROR:
errorKnowledge();
break;
case FAIL:
test.setText("FEHLER!");
break;
}
}
@SuppressLint("SetTextI18n")
public void errorKnowledge(){
TextView hKnowledge = (TextView) findViewById(R.id.testWissenstandHeader);
TextView tKnowledge = (TextView) findViewById(R.id.testWissenstandText);
/* da ist der fehler ... einmal mit dem debugger durch zeigt es doch direkt: hKnowledge und tKnowledge sind null, daher die NullPointerException */
hKnowledge.getResources().getString(R.string.FehlerGefunden);
hKnowledge.getResources().getColor(android.R.color.holo_red_dark);
tKnowledge.getResources().getString(R.string.FehlerText1);
tKnowledge.getResources().getColor(android.R.color.holo_red_light);
}
private enum KnowledgeLevel {
FAIL, ERROR, NOOB, BEGINNER, ADVANCED, PRO, GRANDMASTER;
static KnowledgeLevel fromUserInput(final int input)
{
if (input >= 11 || input <= -1) {
return ERROR;
}
else if (input == 10) {
return GRANDMASTER;
}
else if (input >= 7) {
return PRO;
}
else if (input >= 4) {
return ADVANCED;
}
else if (input >= 1) {
return BEGINNER;
}
else if (input == 0) {
return NOOB;
}
return FAIL;
}
}
そして、私のXML:
<TextView
android:id="@+id/testWissenstandHeader"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginTop="8dp"
android:text="Bla"
android:textAlignment="center"
android:textColor="#511613"
android:textSize="32sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="@+id/kastenKnowledge"
app:layout_constraintLeft_toLeftOf="@+id/kastenKnowledge"
app:layout_constraintRight_toRightOf="@+id/kastenKnowledge"
app:layout_constraintTop_toTopOf="@+id/kastenKnowledge"/>
<TextView
android:id="@+id/testWissenstandText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:text='BlaBla'
android:textAlignment="center"
android:textColor="#E0E0E0"
android:textSize="20sp"
app:layout_constraintHorizontal_bias="0.512"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@+id/testWissenstandHeader"/>
私は少しを調査し、私はstackoverflow.com上で見つけた唯一の解決策は、私はsetContentView();
を使用する必要があるが、私は」ということでした私はそれに2つの問題があります:
1.レイアウトを変更しない場合、なぜそれを使用しますか?
2.私はそれを試して、私のアプリはクラッシュしませんでしたが、私のテキストは変更されませんでした。 (setText();"
が使用される前setContentView();
が使用された)
はここに私の全体のerrorreport(なしデバッグprozess)です:
08-10 00:14:53.580 2774-2774/com.example.alexander.hashtagnevereverbuggy E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.alexander.hashtagnevereverbuggy, PID: 2774
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.widget.TextView.getResources()' on a null object reference
at com.example.alexander.hashtagnevereverbuggy.MainActivity.errorKnowledge(MainActivity.java:112)
at com.example.alexander.hashtagnevereverbuggy.MainActivity.test(MainActivity.java:97)
at com.example.alexander.hashtagnevereverbuggy.MainActivity.checkingInput(MainActivity.java:68)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4756)
at android.view.View$PerformClick.run(View.java:19749)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
はEDIT:
package com.example.alexander.hashtagnevereverbuggy;
import android.annotation.SuppressLint;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Html;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.HashMap;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.MobileAds;
import java.util.Map;
@SuppressWarnings("deprecation")
public class MainActivity extends AppCompatActivity implements Heroes {
private KnowledgeLevel _knowledge = KnowledgeLevel.NOOB;
private static FragmentManager _fragmentManager;
private enum WerteTextFelder {
TITLE,TYP, DAMAGE, LADUNG, KUGELN, NACHLADEDAUER, HEILUNG, HEADSHOT, WIRKUNGSDAUER, EXTRAEFFEKT, BESONDERHEIT
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MobileAds.initialize(this, getString(R.string.AppID));
_fragmentManager = getFragmentManager();
Button testButtonAnfang = (Button) findViewById(R.id.AnfangsButton);
testButtonAnfang.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
setContentView(R.layout.testwissenstand);
}
});
}
@Override
public void onBackPressed() {
if(getFragmentManager().getBackStackEntryCount() > 0) {
getFragmentManager().popBackStack();
}
super.onBackPressed();
}
public void checkingInput(View view) {
TextView eKnowledge = (TextView) findViewById(R.id.enterKnowledge);
try{
int inputNumber = Integer.parseInt(eKnowledge.getText().toString());
_knowledge = KnowledgeLevel.fromUserInput(inputNumber);
test();
hideKeyboard(view);
} catch(NumberFormatException e){
errorKnowledge();
hideKeyboard(view);
}
}
@SuppressLint("SetTextI18n")
public void test() {
setContentView(R.layout.test);
TextView test = (TextView) findViewById(R.id.textView_nur_einmal_benutzt_hoff_ich);
switch(_knowledge) {
case NOOB:
test.setText("ENUM = NOOB");
break;
case BEGINNER:
test.setText("ENUM = BEGINNER");
break;
case ADVANCED:
test.setText("ENUM = ADV");
break;
case PRO:
test.setText("ENUM = PRO");
break;
case GRANDMASTER:
test.setText("ENUM = GM");
break;
case ERROR:
errorKnowledge();
break;
case FAIL:
test.setText("FEHLER!");
break;
}
}
@SuppressLint("SetTextI18n")
public void errorKnowledge(){
TextView hKnowledge = (TextView) findViewById(R.id.testWissenstandHeader);
TextView tKnowledge = (TextView) findViewById(R.id.testWissenstandText);
/* da ist der fehler ... einmal mit dem debugger durch zeigt es doch direkt: hKnowledge und tKnowledge sind null, daher die NullPointerException */
hKnowledge.getResources().getString(R.string.FehlerGefunden);
hKnowledge.getResources().getColor(android.R.color.holo_red_dark);
tKnowledge.getResources().getString(R.string.FehlerText1);
tKnowledge.getResources().getColor(android.R.color.holo_red_light);
}
private enum KnowledgeLevel {
FAIL, ERROR, NOOB, BEGINNER, ADVANCED, PRO, GRANDMASTER;
static KnowledgeLevel fromUserInput(final int input)
{
if (input >= 11 || input <= -1) {
return ERROR;
}
else if (input == 10) {
return GRANDMASTER;
}
else if (input >= 7) {
return PRO;
}
else if (input >= 4) {
return ADVANCED;
}
else if (input >= 1) {
return BEGINNER;
}
else if (input == 0) {
return NOOB;
}
return FAIL;
}
}
public static void addTransaction(Fragment fragment, String tag){
if (_fragmentManager != null) {
FragmentTransaction fragmentTransaction = _fragmentManager.beginTransaction();
fragmentTransaction.add(fragment, tag);
fragmentTransaction.addToBackStack(tag);
fragmentTransaction.commit();
}
}
private void hideKeyboard(View view){
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
private class geileListener implements View.OnClickListener{
private Hero hero;
private geileListener (Hero hero) {
this.hero = hero;
}
@Override
public void onClick(View view) {
setContentView(hero.getHeroLayout());
}
}
private void advertisment() {
/*Notwendig um advertisment im showlock darzustellen*/
AdView mAdView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
}
public void showPreview (Hero hero) {
setContentView(hero.getPreviewLayout());
ImageButton button = (ImageButton) findViewById(R.id.imageButton_Preview);
button.setImageResource(hero.getPreviewImage());
button.setOnClickListener(new geileListener(hero));
advertisment();
}
private Map<WerteTextFelder, TextView> getWerteTextFelder() {
setContentView(R.layout.werte);
Map<WerteTextFelder, TextView> map = new HashMap<>();
TextView Titel = (TextView) findViewById(R.id.textView_Überschrift);
TextView Typ = (TextView) findViewById(R.id.textView_Werte_0);
TextView Damage = (TextView) findViewById(R.id.textView_Wert_1);
TextView Ladung = (TextView) findViewById(R.id.textView_Wert_2);
TextView Kugeln = (TextView) findViewById(R.id.textView_Wert_3);
TextView Nachladedauer = (TextView) findViewById(R.id.textView_Wert_4);
TextView Heilung = (TextView) findViewById(R.id.textView_Wert_5);
TextView Headshot = (TextView) findViewById(R.id.textView_Wert_6);
TextView Wirkungsdauer = (TextView) findViewById(R.id.textView_Wert_7);
TextView ExtraEffekt = (TextView) findViewById(R.id.textView_Wert_8);
TextView wert9 = (TextView) findViewById(R.id.textView_Wert_9);
map.put(WerteTextFelder.TITLE, Titel);
map.put(WerteTextFelder.TYP, Typ);
map.put(WerteTextFelder.DAMAGE, Damage);
map.put(WerteTextFelder.LADUNG, Ladung);
map.put(WerteTextFelder.KUGELN, Kugeln);
map.put(WerteTextFelder.NACHLADEDAUER, Nachladedauer);
map.put(WerteTextFelder.HEILUNG, Heilung);
map.put(WerteTextFelder.HEADSHOT, Headshot);
map.put(WerteTextFelder.WIRKUNGSDAUER, Wirkungsdauer);
map.put(WerteTextFelder.EXTRAEFFEKT, ExtraEffekt);
map.put(WerteTextFelder.BESONDERHEIT, wert9);
return map;
}
(コードの4K行abput)他のすべてが重要なアレント
クラス全体を公開できますか? errorKnowledgeメソッドが呼び出されたときと、onContentViewをonCreateメソッドで実行したかどうかを理解したいと思います。 – instantiator
あなたのログからあなたは "onClick"に問題があると言っています – Salman500
@instantiator私は自分のコードを更新しました。そこに – user8442416