android.content.res.Resources$NotFoundException: Main 中的字符串资源 ID 致命异常 [英] android.content.res.Resources$NotFoundException: String resource ID Fatal Exception in Main
问题描述
我一直在尝试制作一个简单的程序来获取一个小的随机数并在文本视图中显示给用户.在最终获得随机数生成(我认为)之后，每当我运行时，程序都会抛出一个致命的异常.代码没有错误，但我是一个完整的新手，我开始很简单，以便我可以学习.几个小时后，我已经提交请求帮助.我几乎可以肯定我的随机数片段在错误的区域，我只是不确定该放在哪里.我尝试的所有地方都会引发相同的错误.
I've been trying to make a simple program that fetches a small random number and displays it to the user in a textview. After finally getting the random number to generate (I think) the program throws a fatal exception whenever I run. No errors in code, but I'm a complete newbie and I am starting simple so that I may learn. After hours I've submitted to asking for help. I'm almost certain that my snippet for random numbers is in the wrong area, I just am not sure where to put it. Everywhere I tried throws the same error.
这是.java
package com.eai.vgp;
import java.util.Random;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
Random pp = new Random();
int a1 = pp.nextInt(10);
TextView tv = (TextView)findViewById(R.id.tv);{
tv.setText(a1);}
}
XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true" />
</RelativeLayout>
LogCat
03-03 16:34:25.313: I/Process(740): Sending signal. PID: 740 SIG: 9
03-03 16:35:02.212: E/Trace(806): error opening trace file: No such file or directory (2)
03-03 16:35:02.802: W/ResourceType(806): No package identifier when getting value for resource number 0x00000001
03-03 16:35:02.813: D/AndroidRuntime(806): Shutting down VM
03-03 16:35:02.813: W/dalvikvm(806): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
03-03 16:35:02.833: E/AndroidRuntime(806): FATAL EXCEPTION: main
03-03 16:35:02.833: E/AndroidRuntime(806): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.eai.vgp/com.eai.vgp.MainActivity}: android.content.res.Resources$NotFoundException: String resource ID #0x1
03-03 16:35:02.833: E/AndroidRuntime(806): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
03-03 16:35:02.833: E/AndroidRuntime(806): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
03-03 16:35:02.833: E/AndroidRuntime(806): at android.app.ActivityThread.access$600(ActivityThread.java:130)
03-03 16:35:02.833: E/AndroidRuntime(806): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
03-03 16:35:02.833: E/AndroidRuntime(806): at android.os.Handler.dispatchMessage(Handler.java:99)
03-03 16:35:02.833: E/AndroidRuntime(806): at android.os.Looper.loop(Looper.java:137)
03-03 16:35:02.833: E/AndroidRuntime(806): at android.app.ActivityThread.main(ActivityThread.java:4745)
03-03 16:35:02.833: E/AndroidRuntime(806): at java.lang.reflect.Method.invokeNative(Native Method)
03-03 16:35:02.833: E/AndroidRuntime(806): at java.lang.reflect.Method.invoke(Method.java:511)
03-03 16:35:02.833: E/AndroidRuntime(806): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-03 16:35:02.833: E/AndroidRuntime(806): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-03 16:35:02.833: E/AndroidRuntime(806): at dalvik.system.NativeStart.main(Native Method)
03-03 16:35:02.833: E/AndroidRuntime(806): Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x1
03-03 16:35:02.833: E/AndroidRuntime(806): at android.content.res.Resources.getText(Resources.java:229)
03-03 16:35:02.833: E/AndroidRuntime(806): at android.widget.TextView.setText(TextView.java:3620)
03-03 16:35:02.833: E/AndroidRuntime(806): at com.eai.vgp.MainActivity.onCreate(MainActivity.java:22)
03-03 16:35:02.833: E/AndroidRuntime(806): at android.app.Activity.performCreate(Activity.java:5008)
03-03 16:35:02.833: E/AndroidRuntime(806): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
03-03 16:35:02.833: E/AndroidRuntime(806): atandroid.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
03-03 16:35:02.833: E/AndroidRuntime(806): ... 11 more
03-03 16:35:05.113: I/Process(806): Sending signal. PID: 806 SIG: 9
推荐答案
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Random pp = new Random();
int a1 = pp.nextInt(10);
TextView tv = (TextView)findViewById(R.id.tv);
tv.setText(a1);
到onCreate()里面，把tv.setText(a1);改成tv.setText(String.valueOf(a1));代码>:
To inside onCreate(), and change tv.setText(a1); to tv.setText(String.valueOf(a1)); :
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Random pp = new Random();
int a1 = pp.nextInt(10);
TextView tv = (TextView)findViewById(R.id.tv);
tv.setText(String.valueOf(a1));
}
第一个问题:findViewById() 在 onCreate() 之前被调用，这会抛出 NPE.
First issue: findViewById() was called before onCreate(), which would throw an NPE.
第二个问题:将 int 直接传递给 TextView 会调用查找 String 资源的重载方法(来自 R.string).因此，我们要使用 String.valueOf() 来强制 String 重载方法.
Second issue: Passing an int directly to a TextView calls the overloaded method that looks for a String resource (from R.string). Therefore, we want to use String.valueOf() to force the String overloaded method.
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