问android.content.res.Resources $ NotFoundException：字符串资源ID Main中的致命异常该怎么办？

EN

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);}

    }

<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>

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