我是Android新手;所以请耐心等待我。 我正在尝试使用Google Cloud Messasging注册新用户。我使用教程让“注册”按钮工作正常。我正在尝试将一些EditText信息传递到相同的URL，用户名，密码等。 RegisterApp.java看起来像这样
package com.example.android.gcmtest;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.gcm.GoogleCloudMessaging;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
public class RegisterApp extends AsyncTask<Void, Void, String> {
private static final String TAG = "GCMRelated";
Context ctx;
GoogleCloudMessaging gcm;
String SENDER_ID = "mySenderID";
String regid = null;
private int appVersion;
public RegisterApp(Context ctx, GoogleCloudMessaging gcm, int appVersion){
this.ctx = ctx;
this.gcm = gcm;
this.appVersion = appVersion;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected String doInBackground(Void... arg0) {
String msg = "";
try {
if (gcm == null) {
gcm = GoogleCloudMessaging.getInstance(ctx);
}
regid = gcm.register(SENDER_ID);
msg = "Device registered, registration ID=" + regid;
// You should send the registration ID to your server over HTTP,
// so it can use GCM/HTTP or CCS to send messages to your app.
// The request to your server should be authenticated if your app
// is using accounts.
sendRegistrationIdToBackend();
// For this demo: we don't need to send it because the device
// will send upstream messages to a server that echo back the
// message using the 'from' address in the message.
// Persist the regID - no need to register again.
storeRegistrationId(ctx, regid);
} catch (IOException ex) {
msg = "Error :" + ex.getMessage();
// If there is an error, don't just keep trying to register.
// Require the user to click a button again, or perform
// exponential back-off.
}
return msg;
}
private void storeRegistrationId(Context ctx, String regid) {
final SharedPreferences prefs = ctx.getSharedPreferences(MainActivity.class.getSimpleName(),
Context.MODE_PRIVATE);
Log.i(TAG, "Saving regId on app version " + appVersion);
SharedPreferences.Editor editor = prefs.edit();
editor.putString("registration_id", regid);
editor.putInt("appVersion", appVersion);
editor.commit();
}
private void sendRegistrationIdToBackend() {
URI url = null;
try {
url = new URI("http://192.168.0.21/gcm_server_php/register.php?regId=" + regid + "&myName=" + usernamevalue + "&myPassword=" + passwordvalue + "&myCredits=0");
} catch (URISyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
HttpClient httpclient = new DefaultHttpClient();
HttpGet request = new HttpGet();
request.setURI(url);
try {
httpclient.execute(request);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
Toast.makeText(ctx, "Registration Completed. Continue to login...", Toast.LENGTH_LONG).show();
Log.v(TAG, result);
}
}
我的activity_main.xml看起来像这样
<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"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<EditText
android:text="username"
android:id="@+id/myUserName"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<EditText
android:text="password"
android:id="@+id/myPassword"
android:inputType="textPassword"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<Button
android:id="@+id/register"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Register">
</Button>"
</RelativeLayout>
添加
EditText simpleEditText = (EditText) findViewById(R.id.et_simple);
String strValue = simpleEditText.getText().toString();
显示'无法解析方法findviewbyid' 我被困了......如果你需要看MainActivity.java，我会高兴地发布它。
MainActivity.java
package com.example.android.gcmtest;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.gcm.GoogleCloudMessaging;
import java.util.concurrent.atomic.AtomicInteger;
public class MainActivity extends Activity {
private static final int PLAY_SERVICES_RESOLUTION_REQUEST = 9000;
public static final String EXTRA_MESSAGE = "message";
public static final String PROPERTY_REG_ID = "registration_id";
private static final String PROPERTY_APP_VERSION = "appVersion";
private static final String TAG = "GCMRelated";
GoogleCloudMessaging gcm;
AtomicInteger msgId = new AtomicInteger();
String regid;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final Button button = (Button) findViewById(R.id.register);
final EditText myUsername = (EditText) findViewById(R.id.myUserName);
String usernamevalue = myUsername.getText().toString();
if (checkPlayServices()) {
gcm = GoogleCloudMessaging.getInstance(getApplicationContext());
regid = getRegistrationId(getApplicationContext());
if(!regid.isEmpty()){
button.setEnabled(false);
}else{
button.setEnabled(true);
}
}
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Check device for Play Services APK.
if (checkPlayServices()) {
gcm = GoogleCloudMessaging.getInstance(getApplicationContext());
regid = getRegistrationId(getApplicationContext());
if (regid.isEmpty()) {
button.setEnabled(false);
new RegisterApp(getApplicationContext(), gcm, getAppVersion(getApplicationContext())).execute();
} else {
Toast.makeText(getApplicationContext(), "Device already Registered", Toast.LENGTH_SHORT).show();
}
} else {
Log.i(TAG, "No valid Google Play Services APK found.");
}
}
});
}
/**
* Check the device to make sure it has the Google Play Services APK. If
* it doesn't, display a dialog that allows users to download the APK from
* the Google Play Store or enable it in the device's system settings.
*/
private boolean checkPlayServices() {
int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS) {
if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
GooglePlayServicesUtil.getErrorDialog(resultCode, this,
PLAY_SERVICES_RESOLUTION_REQUEST).show();
} else {
Log.i(TAG, "This device is not supported.");
finish();
}
return false;
}
return true;
}
/**
* Gets the current registration ID for application on GCM service.
* <p>
* If result is empty, the app needs to register.
*
* @return registration ID, or empty string if there is no existing
* registration ID.
*/
private String getRegistrationId(Context context) {
final SharedPreferences prefs = getGCMPreferences(context);
String registrationId = prefs.getString(PROPERTY_REG_ID, "");
if (registrationId.isEmpty()) {
Log.i(TAG, "Registration not found.");
return "";
}
// Check if app was updated; if so, it must clear the registration ID
// since the existing regID is not guaranteed to work with the new
// app version.
int registeredVersion = prefs.getInt(PROPERTY_APP_VERSION, Integer.MIN_VALUE);
int currentVersion = getAppVersion(getApplicationContext());
if (registeredVersion != currentVersion) {
Log.i(TAG, "App version changed.");
return "";
}
return registrationId;
}
/**
* @return Application's {@code SharedPreferences}.
*/
private SharedPreferences getGCMPreferences(Context context) {
// This sample app persists the registration ID in shared preferences, but
// how you store the regID in your app is up to you.
return getSharedPreferences(MainActivity.class.getSimpleName(),
Context.MODE_PRIVATE);
}
/**
* @return Application's version code from the {@code PackageManager}.
*/
private static int getAppVersion(Context context) {
try {
PackageInfo packageInfo = context.getPackageManager()
.getPackageInfo(context.getPackageName(), 0);
return packageInfo.versionCode;
} catch (NameNotFoundException e) {
// should never happen
throw new RuntimeException("Could not get package name: " + e);
}
}
}
答案 0 :(得分：0)
findViewById是Activity的功能。我认为您的ctx是Activity。所以，作为一个快速而肮脏的解决方案：
EditText simpleEditText = (EditText) ((Activity)ctx).findViewById(R.id.et_simple);
String strValue = simpleEditText.getText().toString();