Question

在总活动java类

中创建了

错误

这里是logcat

java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.prudentmubasha.ainnaresto / com.example.prudentmubasha.ainnaresto.TotalActivity}：java.lang.StringIndexOutOfBoundsException：字符串索引超出范围：-2 在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2892）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3027）在android.app.servertransaction.LaunchActivityItem.execute（LaunchActivityItem.java:78）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:101）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:73）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1786）在android.os.Handler.dispatchMessage（Handler.java:106）在android.os.Looper.loop（Looper.java:164）在android.app.ActivityThread.main（ActivityThread.java:6656） at java.lang.reflect.Method.invoke（Native Method）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:438）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:823）引起：java.lang.StringIndexOutOfBoundsException：字符串索引超出范围：-2 at java.lang.String.substring（String.java:2036） at com.example.prudentmubasha.ainnaresto.TotalActivity.onCreate（TotalActivity.java:33）在android.app.Activity.performCreate（Activity.java:7117）在android.app.Activity.performCreate（Activity.java:7108）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1262）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2867）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3027）在android.app.servertransaction.LaunchActivityItem.execute（LaunchActivityItem.java:78）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:101）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:73）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1786）在android.os.Handler.dispatchMessage（Handler.java:106）在android.os.Looper.loop（Looper.java:164）在android.app.ActivityThread.main（ActivityThread.java:6656） at java.lang.reflect.Method.invoke（Native Method）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:438）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:823）

这是发生错误的地方

enter c while (st.hasMoreElements()) {
    //Toast.makeText(getApplicationContext(), st.nextElement().toString().substring(0,1), Toast.LENGTH_LONG).show();
    test = st.nextElement().toString().substring(3,1);
    if(count>0)
        total+= Float.parseFloat(test);
    count++;
}

这是总活动java类文件

 mApp=((pizza) getApplicationContext());
et_summary = (EditText) findViewById(R.id.et_summary);
tv_total = (TextView) findViewById(R.id.tv_total);
//Toast.makeText(getApplicationContext(), "You have chosen the" + " " +  mApp.getGlobalVarValue(), Toast.LENGTH_LONG).show();
et_summary.setText(mApp.getGlobalVarValue());
String str = mApp.getGlobalVarValue();
StringTokenizer st = new StringTokenizer(str,"$");
String test="";
float total=0;
int count=0;
while (st.hasMoreElements()) {
    //Toast.makeText(getApplicationContext(), st.nextElement().toString().substring(0,1), Toast.LENGTH_LONG).show();
    test = st.nextElement().toString().substring(3,1);
    if(count>0)
        total+= Float.parseFloat(test);
    count++;
}
et_summary.setText(mApp.getGlobalVarValue());
tv_total.setText("Total :" + total+"");
mApp.setGlobalClear();


}
public boolean isFloat( String input )
{
try
{
    Float.parseFloat( input );
    return true;
}
catch( Exception e)
{
    return false;
}
}
}

Answer 1

你不能从3到1子串交换

substring(3,1);

代表

substring(1,3)

引起：java.lang.StringIndexOutOfBoundsException：字符串索引超出范围：-2位于

1 个答案: