我面临的问题是NullPointerException我无法在我的代码中找出问题所在。请帮帮我。
java.lang.RuntimeException: Unable to start receiver me.radhakrishna.buddyreader.TextMessageReceiver: java.lang.NullPointerException
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2146)
at android.app.ActivityThread.access$1500(ActivityThread.java:127)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4441)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:823)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:590)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at me.radhakrishna.buddyreader.MainActivity.stopReading(MainActivity.java:81)
at me.radhakrishna.buddyreader.TextMessageReceiver.onReceive(TextMessageReceiver.java:59)
at android.app.ActivityThread.handleReceiver(ActivityThread.java:2139)
... 10 more
我的清单文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="me.radhakrishna.buddyreader"
android:versionCode="14"
android:versionName="1.2.2" >
<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.READ_SMS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="me.radhakrishna.buddyreader.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="me.radhakrishna.buddyreader.MessageActivity"
android:label="@string/app_name" >
</activity>
<activity
android:name="me.radhakrishna.buddyreader.PreferActivity"
android:label="@string/app_name" >
</activity>
<receiver android:name="me.radhakrishna.buddyreader.TextMessageReceiver" android:exported="true">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.provider.Telephony.SMS_RECEIVED" />
</intent-filter>
</receiver>
</application>
</manifest>
我的TextMessageReceiver.java文件：
package me.radhakrishna.buddyreader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract.PhoneLookup;
import android.telephony.SmsMessage;
public class TextMessageReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent){
if ("android.intent.action.BOOT_COMPLETED".equals(intent.getAction())) {
String val="";
FileInputStream fileos;
try {
fileos = context.getApplicationContext().openFileInput("startup");
byte[] input = new byte[fileos.available()];
while(fileos.read(input) != -1){
val += new String(input);
}
if(val.equals("ON")){
Intent myIntent = new Intent(context, MainActivity.class);
myIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(myIntent);
}
fileos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Bundle bundle=intent.getExtras();
Object[] messages=(Object[])bundle.get("pdus");
SmsMessage[] sms=new SmsMessage[messages.length];
for(int n=0;n<messages.length;n++){
sms[n]=SmsMessage.createFromPdu((byte[]) messages[n]);
}
for(SmsMessage msg:sms){
final String mobileNum = msg.getOriginatingAddress();
Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(mobileNum));
Cursor cursor= context.getContentResolver().query(uri, new String[]{PhoneLookup.DISPLAY_NAME},null,null,null);
final MainActivity main = new MainActivity();
main.stopReading();
main.setSpeechSpeed();
String messageFormat = "Message from "+mobileNum+". Message: "+msg.getMessageBody();
FileOutputStream fos;
try {
fos = context.getApplicationContext().openFileOutput("lastmessage",Context.MODE_PRIVATE);
fos.write(messageFormat.toString().getBytes());
fos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (cursor.getCount()>0){
cursor.moveToFirst();
String contactName = cursor.getString(0);
cursor.close();
String enteredText = "Excuse me sir, You got a message from "+contactName+". Message, "+msg.getMessageBody();
String words = enteredText.toString();
main.speakWords(words);
}else{
String enteredText = "Excuse me sir, You got a message from "+mobileNum+". Message, "+msg.getMessageBody();
String words = enteredText.toString();
main.speakWords(words);
}
}
}
}
提前致谢。