我正在研究android的短信功能，我可以通过短信将用户的位置和地址发送到有限数量的联系人作为我的应用程序要求，现在我想实现进度对话框，所以当用户点击发送按钮，应该出现进度对话框，在向所有联系人发送短信后，进度对话框应该消失。
我搜索了很多但是这让我很困惑如何做到这一点我的申请，因为我是android的初学者！
任何人都可以帮助我如何在我的班级中实现 onPreExecute（），onPostExecute（）和doInBackground（） 方法，这里我包括我的java类发送短信。
package com.example.ghaznavi.myapp;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.telephony.SmsManager;
import android.util.Log;
import android.widget.Toast;
import android.content.IntentFilter;
public class SmsHandler{
Settings setObj=new Settings();
double latitude,longitude;
public SmsHandler() {
}
public void SendSms(final Context hcontext)
{
GPSService mGPSService = new GPSService(hcontext);
LocationAddress locObj=new LocationAddress();
mGPSService.getLocation();
latitude = mGPSService.getLatitude();
longitude = mGPSService.getLongitude();
StringBuilder sb = new StringBuilder(160);
String addd= locObj.getAddressFromLocation(latitude,longitude,hcontext);
sb.append("Hi, I m in trouble, Please Help!\n\n");
if ((latitude != 0.0) && (longitude!= 0.0)) {
sb.append("Map Link:").append("\n").append("https://maps.google.com/maps?q=").append(latitude).append("%2C").append(longitude).append("\n\n");
}
if (addd != null) {
sb.append("Address: ").append(addd).append("\n\n");
}
sb.append( "- My Application");
setObj.Initialize(hcontext);
if (setObj.GetContactListCount()!=0)
{
for(int i=0;i<setObj.GetContactListCount();i++)
{
try
{
String SENT = "SMS_SENT";
PendingIntent sentPI = PendingIntent.getBroadcast(hcontext, 0, new Intent(
SENT), 0);
BroadcastReceiver sendSMS = new BroadcastReceiver() {
@Override
public void onReceive(Context arg0, Intent arg1) {
switch (getResultCode()) {
case Activity.RESULT_OK:
Toast.makeText(hcontext, "SMS sent Successfully",
Toast.LENGTH_SHORT).show();
break;
case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
Toast.makeText(hcontext, "Generic failure",
Toast.LENGTH_SHORT).show();
break;
case SmsManager.RESULT_ERROR_NO_SERVICE:
Toast.makeText(hcontext, "No service",
Toast.LENGTH_SHORT).show();
break;
case SmsManager.RESULT_ERROR_NULL_PDU:
Toast.makeText(hcontext, "Null PDU",
Toast.LENGTH_SHORT).show();
break;
case SmsManager.RESULT_ERROR_RADIO_OFF:
Toast.makeText(hcontext, "Radio off",
Toast.LENGTH_SHORT).show();
break;
}
}
};
SmsManager localSmsManager = SmsManager.getDefault();
if (sb.toString().length() <= 160) {
hcontext.registerReceiver(sendSMS, new IntentFilter(SENT));
localSmsManager.sendTextMessage(setObj.GetContactListNumber()[i], null, sb.toString(), sentPI, null);
} else {
hcontext.registerReceiver(sendSMS, new IntentFilter(SENT));
localSmsManager.sendTextMessage(setObj.GetContactListNumber()[i], null, sb.toString().substring(0, 159),sentPI, null);
localSmsManager.sendTextMessage(setObj.GetContactListNumber()[i], null, sb.toString().substring(160),sentPI, null);
}
}
catch (SecurityException localSecurityException)
{
Log.e("Error", "Security Exception, SMS permission denied");
return;
}
}
}
else
{
Toast.makeText(hcontext,"please select a number",Toast.LENGTH_SHORT).show();
}
}
}
非常感谢任何帮助，谢谢你！
答案 0 :(得分：0)
1）您将需要扩展AsyncTask的类
2）然后尝试foll。摘录 -
public class SendSMS extends AsyncTask<String ,String,String>{
ProgressDialog pd = new ProgressDialog(MainActivity.this);
@Override
protected void onPreExecute() {
super.onPreExecute();
//this method executes Before background process done
pd.setTitle("Please Wait!");
pd.setMessage("Sending SMS");
pd.show();
}
@Override
protected String doInBackground(String... params) {
//Your logic here for sending SMS
return null;
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
//this method executes after completion of background process
pd.dismiss(); //don't forget to dismiss
}
}
希望它会有所帮助：）
答案 1 :(得分：0)
public class YourActivity extends AppCompatActivity{
// Constant variables to show progress dialogs...
private static final int SHOW_PROGRESS = 0x01;
private static final int STOP_PROGRESS = 0x02;
// On create...
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_xml_layout);
new SendSms().execute();
}
// Your asynchronous class..
public class SendSms extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
mHandler.sendEmptyMessage(SHOW_PROGRESS);
}
@Override
protected Void doInBackground(Void... params) {
// Do your work here
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
mHandler.sendEmptyMessage(STOP_PROGRESS);
}
}
Handler mHandler = new Handler() {
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case SHOW_PROGRESS:
if (mProgressDialog == null) {
mProgressDialog = Utils.createProgressDialog(YourActivity.this);
mProgressDialog.show();
} else
mProgressDialog.show();
mHandler.removeMessages(SHOW_PROGRESS);
break;
case STOP_PROGRESS:
if (mProgressDialog != null && mProgressDialog.isShowing())
mProgressDialog.dismiss();
mHandler.removeMessages(STOP_PROGRESS);
break;
}
};
protected void onDestroy() {
super.onDestroy();
if (mProgressDialog != null && mProgressDialog.isShowing())
mProgressDialog.dismiss();
}
//在Utils类中复制以下方法..
public static ProgressDialog createProgressDialog(Context mContext) {
// if you want to set style..
ProgressDialog dialog = new ProgressDialog(mContext,
R.style.MyProgressDialogStyle);
// or Otherwise..
ProgressDialog dialog = new ProgressDialog(mContext);
try {
dialog.setCancelable(false);
dialog.getWindow().setBackgroundDrawable(
new ColorDrawable(mContext.getResources().getColor(android.R.color.transparent)));
dialog.show();
dialog.setContentView(R.layout.custom_progress_dialog);
} catch (BadTokenException e) {
Utils.debug(e.getMessage());
}
return dialog;
}
和layout.xml中的custom_progress_dialog
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:background="@android:color/transparent">
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true">
<ProgressBar
android:id="@+id/progressBar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dip" />
</FrameLayout>
</RelativeLayout>
多数民众赞成......你很高兴。如果您遇到任何麻烦，请告诉我。