我做了一个应用程序（在Android studio 3.0.1中），它可以显示输入的数字是三角形数字，还是方形数字，还是两者都有，或者没有。然而，当我输入一个数字并按下 "回车 "按钮时，应用程序就会冻结，并停止响应。我试着改变循环的类型（forwhile）......但没有任何结果。
我在下面给出了.java代码......
package com.example.home.numbershape;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
class testNumber {
int n;
int i = 0;
int tTestnum;
int sTestNum;
boolean triangular;
boolean square;
boolean triangleTest(){
while( tTestnum <= n){
int tTestnum = i*(i+1)/2;
if( n == tTestnum){
triangular = true;
} else if(n > tTestnum){
i++;
} else {
triangular = false;
}
}
return triangular;
}
boolean squareTest(){
while( sTestNum <= n){
int sTestNum = i*i;
if( n == sTestNum ){
square = true;
} else if(n > sTestNum){
i++;
} else {
square = false;
}
}
return square;
}
}
public void submitFunction(View view){
testNumber num = new testNumber();
EditText inNum = (EditText) findViewById(R.id.inputNum);
String nString = inNum.getText().toString();
num.n = Integer.parseInt(nString);
if(num.triangleTest()){
if(num.squareTest()){
Toast.makeText(this, "It is both a triangular and a square number!", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(this, "It is a triangular number.", Toast.LENGTH_LONG).show();
}
} else if(num.squareTest()){
if(num.triangleTest()){
Toast.makeText(this, "It is both a triangular and a square number!", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(this, "It is a square number.", Toast.LENGTH_LONG).show();
}
}
else {
Toast.makeText(this, "It is neither.", Toast.LENGTH_LONG).show();
}
Log.i("Info", "Submitted and checked.");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
下面是.xml代码......。
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:context="com.example.home.numbershape.MainActivity">
<EditText
android:id="@+id/inputNum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="21dp"
android:layout_marginEnd="84dp"
android:layout_marginStart="85dp"
android:layout_marginTop="33dp"
android:ems="10"
android:hint="enter the number."
android:inputType="number"
android:selectAllOnFocus="true"
android:singleLine="false"
app:layout_constraintBottom_toTopOf="@+id/submitButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />
<TextView
android:id="@+id/textView"
android:layout_width="292dp"
android:layout_height="113dp"
android:layout_marginBottom="33dp"
android:layout_marginEnd="46dp"
android:layout_marginStart="46dp"
android:layout_marginTop="29dp"
android:text="This app tells you whether the number which you have typed in is a Square number, triangular number, both or none. So give it a go!"
android:textAlignment="center"
android:textSize="18sp"
app:layout_constraintBottom_toTopOf="@+id/inputNum"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/submitButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="221dp"
android:layout_marginEnd="148dp"
android:layout_marginStart="148dp"
android:layout_marginTop="21dp"
android:onClick="submitFunction"
android:text="enter"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/inputNum" />
</android.support.constraint.ConstraintLayout>
我在代码结构上有什么错误吗？请告诉有什么问题...谢谢!
P.S: 这里是日志 05-24 10:35:45.471 2322-2322/com.google.android.gms.persistent E/ActivityThread: Service com.google.android.gms.autofill.service.AutofillService has leaked IntentReceiver com.google.android.gms.autofill.smsretriever.TracingSmsBroadcastReceiver@88dcee that was originally registered here. Are you missing a call to unregisterReceiver()?
android.app.IntentReceiverLeaked: Service com.google.android.gms.autofill.service.AutofillService has leaked IntentReceiver com.google.android.gms.autofill.smsretriever.TracingSmsBroadcastReceiver@88dcee that was originally registered here. Are you missing a call to unregisterReceiver()?
at android.app.LoadedApk$ReceiverDispatcher.<init>(LoadedApk.java:1588)
at android.app.LoadedApk.getReceiverDispatcher(LoadedApk.java:1368)
at android.app.ContextImpl.registerReceiverInternal(ContextImpl.java:1515)
at android.app.ContextImpl.registerReceiver(ContextImpl.java:1488)
at android.app.ContextImpl.registerReceiver(ContextImpl.java:1476)
at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:627)
at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:627)
at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:627)
at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:627)
at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:627)
at lkl.<init>(:com.google.android.gms@[email protected] (040700-294335909):5)
at ljc.<init>(:com.google.android.gms@[email protected] (040700-294335909):1)
at kxb.a(:com.google.android.gms@[email protected] (040700-294335909):10)
at bzlo.a(:com.google.android.gms@[email protected] (040700-294335909):5)
at kxj.a(:com.google.android.gms@[email protected] (040700-294335909):2)
at bzlo.a(:com.google.android.gms@[email protected] (040700-294335909):5)
at kvm.b(:com.google.android.gms@[email protected] (040700-294335909):0)
at lfu.onFillRequest(:com.google.android.gms@[email protected] (040700-294335909):70)
at android.service.autofill.-$$Lambda$I0gCKFrBTO70VZfSZTq2fj-wyG8.accept(Unknown Source:8)
at com.android.internal.util.function.pooled.PooledLambdaImpl.doInvoke(PooledLambdaImpl.java:300)
at com.android.internal.util.function.pooled.PooledLambdaImpl.invoke(PooledLambdaImpl.java:195)
at com.android.internal.util.function.pooled.OmniFunction.run(OmniFunction.java:86)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
05-24 10:35:59.300 2114-2146/system_process E/memtrack: Couldn't load memtrack module
你没有在你的Java代码中引用你的按钮。试着将这段代码添加到"... "中。onCreate 你的 Main 活动
Button Sbutton = findViewById(R.id.submitButton);