[英]Android button: onClick not working
我正在从事的android应用程序的主要活动中包含以下代码。 由于某种原因,每当我运行该应用程序时,它就会崩溃! 我的activityMain.xml
(部分内容)以及onClick
侦听器和日志错误位于下面。
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/calculate"
android:id="@+id/button"
android:textSize="20sp"
android:onClick="calculateScore"
android:layout_row="0"
android:layout_column="0"/>
我的主程序类中具有以下Java代码:
public void calculateScore(View view) {
TextView totalScore = (TextView) findViewById(R.id.total);
totalScore.setText(totalPoints);
}
我得到这个错误:
Process: org.alexwebber.frc.strongholdcalculator, PID: 8355
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:275)
at android.view.View.performClick(View.java:5254)
at android.view.View$PerformClick.run(View.java:21179)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6895)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:270)
at android.view.View.performClick(View.java:5254)
at android.view.View$PerformClick.run(View.java:21179)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6895)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0xec
at android.content.res.Resources.getText(Resources.java:1399)
at android.widget.TextView.setText(TextView.java:4931)
at org.alexwebber.frc.strongholdcalculator.MainActivity.calculateScore(MainActivity.java:44)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:270)
at android.view.View.performClick(View.java:5254)
at android.view.View$PerformClick.run(View.java:21179)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6895)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
由于某种原因,它无法使用onClick
方法。 任何帮助将是无价之宝!
onClick代码已正确执行。
问题是totalPoints
是一个int
,而不是文本,因此setText
正在查找字符串资源ID,但找不到它。
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0xec
at android.content.res.Resources.getText(Resources.java:1399)
at android.widget.TextView.setText(TextView.java:4931)
at org.alexwebber.frc.strongholdcalculator.MainActivity.calculateScore(MainActivity.java:44)
请将此代码更改为此
totalScore.setText("" + totalPoints);
我认为您正在将整数值传递给calculateScore()中的setText方法。 尝试这个 ::
public void calculateScore(View view) {
TextView totalScore = (TextView) findViewById(R.id.total);
totalScore.setText(String.valueOf(totalPoints));
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.