我在 Android studio 中创建了一个简短的测验，其中包含 4 个问题。第一个问题有单选按钮，第二个问题有复选框，第三个问题有常规按钮，第四/第五个问题是 EditText。每当我在运行后按任何按钮时，应用程序都会崩溃，并且日志中会显示大量错误。
Activity 主要:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
style="@style/Background"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.hende.germanquiz.MainActivity">
<TextView
android:id="@+id/Header_text_view"
style="@style/Header"
android:text="@string/header_text" />
<TextView
android:id="@+id/question_one"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="16dp"
android:text="@string/questionOne" />
<RadioGroup
android:id="@+id/radio_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<RadioButton
android:id="@+id/radio1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:checked="true"
android:onClick="Bitte schön"
android:text="@string/wrong1_answer" />
<RadioButton
android:id="@+id/radio2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:onClick="Ich heiße"
android:text="@string/correct_answer" />
<RadioButton
android:id="@+id/radio3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:onClick="Sprechen sie Deutsch?"
android:text="@string/wrong2_answer" />
<TextView
android:id="@+id/question_two"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="16dp"
android:text="@string/questionTwo"
android:textColor="#B71C1C" />
<CheckBox
android:id="@+id/checkbox1"
style="@style/Buttons"
android:onClick="rechnung1"
android:text="@string/correct2_answer" />
<CheckBox
android:id="@+id/checkbox2"
style="@style/Buttons"
android:onClick="rechnung2"
android:text="@string/correct3_answer" />
<CheckBox
android:id="@+id/checkbox3"
style="@style/Buttons"
android:onClick="Vogel"
android:text="Hast du einen Vogel?" />
<TextView
android:id="@+id/question_three_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingTop="16dp"
android:text="@string/question_three" />
<TextView
android:id="@+id/question_threea_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/question_threea" />
<Button
android:id="@+id/button2"
style="@style/RegularButton"
android:text="@string/wrong4_answer"
android:onClick="button2"/>
<Button
android:id="@+id/button3"
style="@style/RegularButton"
android:text="@string/wrong5_answer"
android:onClick="button3"/>
<Button
android:id="@+id/button1"
style="@style/RegularButton"
android:text="@string/correct4_answer"
android:onClick="button1"/>
<TextView
android:id="@+id/aurora_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/questionFour"
android:layout_marginTop="10dp" />
<EditText
android:id="@+id/edit_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:id="@+id/_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/questionFive"
android:layout_marginTop="10dp"/>
<EditText
android:id="@+id/edit2_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/submit_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/submit_button"
android:onClick="calculateScore"/>
<TextView
android:id="@+id/score_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RadioGroup>
</LinearLayout>
</ScrollView>
主要 Activity :
public class MainActivity extends AppCompatActivity {
int score = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void questionOne(){
RadioButton radio2 =(RadioButton)findViewById(R.id.radio2);
if (radio2.isSelected()) {
score = score + 1;
}}
public void questionTwo(){
CheckBox checkbox1 =(CheckBox) findViewById(R.id.checkbox1);
CheckBox checkbox2=(CheckBox) findViewById(R.id.checkbox2);
if(checkbox1.isChecked() &&checkbox2 .isChecked()){
score = score + 1;
}
}
public void questionThree(){
Button button1 = (Button)findViewById(R.id.button1);
Button button2 = (Button)findViewById(R.id.button2);
Button button3 = (Button)findViewById(R.id.button3);
if (button1.isSelected()) {
score= score + 1;
}
}
public void questionFour(){
EditText edit_text_view =(EditText) findViewById(R.id.edit_text_view);
if (edit_text_view.getText().toString().contains("Nordlicht") || edit_text_view.getText().toString().contains("Nordlicht")) {
score = score + 1;
}
}
public void questionFive(){
EditText edit2_text_view=(EditText)findViewById(R.id.edit2_text_view);
if (edit2_text_view.getText().toString().contains("On October 10th at 10:10, 10 tame goats pull 10 centners of sugar to the zoo")|| edit2_text_view.getText().toString().contains("On October 10th at 10:10, 10 tame goats pull 10 centners of sugar to the zoo")) {
score = score + 1;
}
}public void calculateScore(View view){
display (score);
questionOne ();
questionTwo ();
questionThree();
questionFour ();
questionFive ();
}
private void display(int number) {
TextView score_text_view = (TextView) findViewById(
R.id.score_text_view);
score_text_view.setText("" + number);
}}
日志错误:
08-27 13:07:50.408 3344-3344/com.example.hende.germanquiz E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.hende.germanquiz, PID: 3344
java.lang.IllegalStateException: Could not find method rechnung2(View) in a parent or ancestor Context for
android:onClick attribute defined on view class android.support.v7.widget.AppCompatCheckBox with id 'checkbox2'
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:327)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:284)
at android.view.View.performClick(View.java:5609)
at android.widget.CompoundButton.performClick(CompoundButton.java:122)
at android.view.View$PerformClick.run(View.java:22259)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
08-27 12:49:22.499 32531-416/com.example.hende.germanquiz E/InstantRun:
Failed to update existing theme for activity com.example.hende.germanquiz.MainActivity@587f4d8
java.lang.NoSuchFieldException: No field mTheme in class Landroid/content/res/Resources$Theme;
(declaration of 'android.content.res.Resources$Theme' appears in /system/framework/framework.jar)
at java.lang.Class.getDeclaredField(Native Method)
at com.android.tools.fd.runtime.MonkeyPatcher.monkeyPatchExistingResources(MonkeyPatcher.java:374)
at com.android.tools.fd.runtime.Server.restart(Server.java:523)
at com.android.tools.fd.runtime.Server.access$600(Server.java:61)
at com.android.tools.fd.runtime.Server$SocketServerReplyThread.handle(Server.java:318)
at com.android.tools.fd.runtime.Server$SocketServerReplyThread.run(Server.java:190)
at com.android.tools.fd.runtime.Server$SocketServerThread.run(Server.java:158)
at java.lang.Thread.run
08-27 12:49:43.382 32531-32531/com.example.hende.germanquiz E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
08-27 12:49:43.590 32531-32531/com.example.hende.germanquiz E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
最佳答案
在 xml 中定义 onClick 属性。这意味着当您单击该按钮时，android 将调用“onClick”属性中命名的方法。由于您没有在 MainActivity 中定义这些方法，因此您会收到运行时错误
关于java - 按下按钮时应用程序崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39185801/