我想编写一个应用程序，以便在等待接收短信时显示进度对话框。接收SMS时，非空TextView smsReceive将作为解除进度对话框的条件。但它获得了runtimeException。你能告诉我代码中要改变什么。
package cx.opseng.PerfTOLD;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.SmsManager;
import android.telephony.SmsMessage;
import android.util.Log;
import android.widget.TextView;
public class Sms extends Activity {
/** Called when the activity is first created. */
static TextView smsReceive;
static TextView smsReceiveChar;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.sms);
Intent i = getIntent();
// Receiving the Data
String reg = i.getStringExtra("reg");
String port = i.getStringExtra("port");
String smsMessage = reg + port ;
// Show SMS sent message on screen
TextView smsSend = (TextView) findViewById(R.id.smsSend);
smsSend.setText(smsMessage);
Log.i("smsSend",String.valueOf(smsSend.getText()));
// Send SMS message
SmsManager sm = SmsManager.getDefault();
String number = "5556";
sm.sendTextMessage(number, null, smsMessage, null, null);
ProgressDialog dialog = new ProgressDialog(Sms.this);
dialog.setMessage("working hard......");
dialog.setIndeterminate(true);
dialog.setCancelable(true);
dialog.show();
// Receive SMS message
smsReceive = null;
smsReceive = (TextView) findViewById(R.id.smsReceive);
Log.i("smsReceive",smsReceive.getText().toString());
if (smsReceive.getText().toString() != null) {
Log.i("smsReceive",smsReceive.getText().toString());
String smsChar = smsReceive.getText().toString();
Integer smsChar2 = smsChar.length();
String smsChar3 = Integer.toString(smsChar2);
Log.i("smsReceive2",smsChar3);
smsReceiveChar.setText(smsChar);
smsReceiveChar = (TextView) findViewById(R.id.smsReceiveChar);
}
if (smsReceiveChar.getText().toString() .equals("Message")) {
dialog.dismiss();
}
}
public static void updateMessageBox(String msg)
{
smsReceive.append(msg);
smsReceiveChar.append(msg);
}
}
public class SmsReceiver extends BroadcastReceiver{
public void onReceive(Context context, Intent intent)
{
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){
String num = msg.getOriginatingAddress();
Log.i("SMS sender",num);
if (num.equals("15555215556")) {
Sms.updateMessageBox("\nFrom: " + msg.getOriginatingAddress() +
"\n" + "Message: " + msg.getMessageBody() + "\n"); }
}
}
}
logcat如下：
08-14 11:16:56.152: E/AndroidRuntime(2091): FATAL EXCEPTION: main
08-14 11:16:56.152: E/AndroidRuntime(2091): java.lang.RuntimeException: Unable to start activity ComponentInfo{cx.opseng.PerfTOLD/cx.opseng.PerfTOLD.Sms}: java.lang.StringIndexOutOfBoundsException
08-14 11:16:56.152: E/AndroidRuntime(2091): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
08-14 11:16:56.152: E/AndroidRuntime(2091): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
08-14 11:16:56.152: E/AndroidRuntime(2091): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
08-14 11:16:56.152: E/AndroidRuntime(2091): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
08-14 11:16:56.152: E/AndroidRuntime(2091): at android.os.Handler.dispatchMessage(Handler.java:99)
08-14 11:16:56.152: E/AndroidRuntime(2091): at android.os.Looper.loop(Looper.java:123)
08-14 11:16:56.152: E/AndroidRuntime(2091): at android.app.ActivityThread.main(ActivityThread.java:4627)
08-14 11:16:56.152: E/AndroidRuntime(2091): at java.lang.reflect.Method.invokeNative(Native Method)
08-14 11:16:56.152: E/AndroidRuntime(2091): at java.lang.reflect.Method.invoke(Method.java:521)
08-14 11:16:56.152: E/AndroidRuntime(2091): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-14 11:16:56.152: E/AndroidRuntime(2091): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-14 11:16:56.152: E/AndroidRuntime(2091): at dalvik.system.NativeStart.main(Native Method)
08-14 11:16:56.152: E/AndroidRuntime(2091): Caused by: java.lang.StringIndexOutOfBoundsException
08-14 11:16:56.152: E/AndroidRuntime(2091): at java.lang.String.substring(String.java:1579)
08-14 11:16:56.152: E/AndroidRuntime(2091): at cx.opseng.PerfTOLD.Sms.onCreate(Sms.java:88)
08-14 11:16:56.152: E/AndroidRuntime(2091): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-14 11:16:56.152: E/AndroidRuntime(2091): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
08-14 11:16:56.152: E/AndroidRuntime(2091): ... 11 more
答案 0 :(得分：1)
我做了一个适合我的例子。
我遇到了因使用线程而导致进度对话无效的问题。
AndroidManifest.xml：
<manifest package="com.mw.stackoverflow.example02"
android:versionCode="1"
android:versionName="1.0" xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.RECEIVE_SMS"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity.java：
package com.mw.stackoverflow.example02;
import android.os.AsyncTask;
import android.os.Bundle;
import android.telephony.SmsMessage;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.IntentFilter;
public class MainActivity extends Activity implements SmsUpdater
{
private static final String TAG = "MainActivity";
private SmsReceiver mSmsReceiver;
private class ExaminMessagesTask extends AsyncTask<SmsMessage, Void, Boolean>
{
ProgressDialog mProgressDialog;
@Override
protected void onPreExecute()
{
super.onPreExecute();
mProgressDialog = new ProgressDialog(MainActivity.this);
mProgressDialog.setMessage("Receiving SMS.");
mProgressDialog.setIndeterminate(true);
mProgressDialog.setCancelable(true);
mProgressDialog.show();
}
protected Boolean doInBackground(SmsMessage... messages)
{
if (messages.length > 0)
{
Log.d(TAG, "Showing progress dialog.");
}
for (SmsMessage m: messages)
{
Log.d(TAG, "Message received");
}
int count = 0;
for(SmsMessage msg:messages)
{
String num = msg.getOriginatingAddress();
Log.d(TAG, num);
mProgressDialog.setTitle("Processing message " + (count++));
try
{
Thread.sleep(1000);
}
catch (InterruptedException e)
{
}
}
return true;
}
protected void onProgressUpdate(Integer... progress)
{
}
protected void onPostExecute(Boolean result)
{
mProgressDialog.dismiss();
}
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSmsReceiver = new SmsReceiver(this);
}
@Override
protected void onResume()
{
super.onResume();
IntentFilter filter = new IntentFilter();
filter.addAction("android.provider.Telephony.SMS_RECEIVED");
registerReceiver(mSmsReceiver, filter);
}
@Override
public void onPause()
{
super.onPause();
unregisterReceiver(mSmsReceiver);
}
@Override
public void gotSms(final SmsMessage[] m)
{
Log.d(TAG, "OnReceive, number of messages: " + m.length);
runOnUiThread(new Runnable()
{
public void run()
{
Toast.makeText(MainActivity.this, "SMS received", Toast.LENGTH_SHORT).show();
new ExaminMessagesTask().execute(m);
}
});
}
}
SmsReceiver.java：
package com.mw.stackoverflow.example02;
import android.os.Bundle;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v4.app.NavUtils;
import android.telephony.SmsMessage;
class SmsReceiver extends BroadcastReceiver
{
private static final String TAG = "SMSREC";
private SmsUpdater mSmsUpdater;
public SmsReceiver(SmsUpdater u)
{
super();
mSmsUpdater = u;
}
public void onReceive(Context context, Intent intent)
{
Log.d(TAG, "OnReceive called.");
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]);
}
mSmsUpdater.gotSms(sms);
}
}
SmsUpdater.java
package com.mw.stackoverflow.example02;
import android.telephony.SmsMessage;
public interface SmsUpdater
{
void gotSms(SmsMessage[] m);
}
答案 1 :(得分：0)
请在第85行查看活动onCreate()的{{1}}，以获取可能为null的参考。那就是日志说：
09:41:09.993: E/AndroidRuntime(1832): Caused by: java.lang.NullPointerException 08-14 09:41:09.993: E/AndroidRuntime(1832): at cx.opseng.PerfTOLD.Sms.onCreate(Sms.java:85) 08-14
由于你没有为它发布代码，我无法告诉你哪个对象为空。