私は HTTP を使用するのが初めてで、Android ではそれ以上です。JSON オブジェクトを使用して HTTP Post 経由で必要な情報を送信するログインを認証しようとしています/認証する必要があります。
アプリを実行すると、アクセス URL、ユーザー名、およびパスワードにインストールを追加するように求めるログイン画面を使用してログインします。それらを入力して確認ボタンを押すと、アプリがクラッシュし、「残念ながら、TesterField が停止しました」というメッセージが表示されます。
LOGCAT で識別されている内容を解読できません。
この（実行時）エラーの背後にある理由を教えてください。
コード：
package name.company.androidlogin;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.json.JSONException;
import org.json.JSONObject;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class LoginScreen extends Activity {
private Button loginButton;
private TextView resultText;
private EditText usernameText;
private EditText passwordText;
private EditText installText;
private String accessURL = "http://url";
public final String CONSUMER_KEY = "KEY";
public final String CONSUMER_SECRET = "SECRET";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.login_screen);
loginButton = (Button) findViewById(R.id.btn_login);
resultText = (TextView) findViewById(R.id.lbl_result);
usernameText = (EditText) findViewById(R.id.txt_username);
passwordText = (EditText) findViewById(R.id.txt_password);
installText = (EditText) findViewById(R.id.txt_install);
loginButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.login_screen, menu);
return true;
}
public void sendJson()
{
JSONObject jOb;
try {
jOb = toJSON();
HttpPost httpPost = new HttpPost(accessURL);
StringEntity entity = new StringEntity(jOb.toString(), HTTP.UTF_8);
entity.setContentType("application/json");
httpPost.setEntity(entity);
HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(httpPost);
resultText.setText(response.getStatusLine().getStatusCode()+" "+response.getStatusLine().getReasonPhrase());
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public JSONObject toJSON() throws JSONException {
JSONObject credentials = new JSONObject();
try {
credentials.put("ConsumerSecret", CONSUMER_SECRET);
credentials.put("ConsumerKey", CONSUMER_KEY);
credentials.put("Password", passwordText.getText());
credentials.put("Username", usernameText.getText());
} finally {
resultText.setText(credentials.toString(2));
}
return credentials;
}
}
ログ猫:
07-16 13:55:50.834: I/ActivityManager(93): START {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=name.company.testerfield/.URLBuilder bnds=[120,402][240,552]} from pid 192
07-16 13:55:50.834: W/WindowManager(93): Failure taking screenshot for (180x300) to layer 21005
07-16 13:55:50.954: D/dalvikvm(1122): Not late-enabling CheckJNI (already on)
07-16 13:55:50.997: I/ActivityManager(93): Start proc name.company.testerfield for activity name.company.testerfield/.URLBuilder: pid=1122 uid=10040 gids={3003}
07-16 13:55:51.134: I/WindowManager(93): createSurface Window{415d4950 Starting name.company.testerfield paused=false}: DRAW NOW PENDING
07-16 13:55:51.474: W/NetworkManagementSocketTagger(93): setKernelCountSet(10040, 1) failed with errno -2
07-16 13:55:52.474: I/WindowManager(93): createSurface Window{41620b70 name.company.testerfield/name.company.testerfield.URLBuilder paused=false}: DRAW NOW PENDING
07-16 13:55:52.604: D/gralloc_goldfish(1122): Emulator without GPU emulation detected.
07-16 13:55:52.704: I/ActivityManager(93): Displayed name.company.testerfield/.URLBuilder: +1s788ms
07-16 13:55:52.974: W/NetworkManagementSocketTagger(93): setKernelCountSet(10005, 0) failed with errno -2
07-16 13:55:55.054: I/WindowManager(93): createSurface Window{415cdbe0 InputMethod paused=false}: DRAW NOW PENDING
07-16 13:55:56.084: D/dalvikvm(147): GC_CONCURRENT freed 306K, 35% free 10784K/16455K, paused 6ms+8ms
07-16 13:56:09.504: D/dalvikvm(93): GC_CONCURRENT freed 483K, 10% free 12354K/13639K, paused 6ms+33ms
07-16 13:56:13.364: D/dalvikvm(376): GC_CONCURRENT freed 499K, 6% free 11433K/12039K, paused 6ms+27ms
07-16 13:56:17.134: D/AndroidRuntime(1122): Shutting down VM
07-16 13:56:17.134: W/dalvikvm(1122): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
07-16 13:56:17.164: E/AndroidRuntime(1122): FATAL EXCEPTION: main
07-16 13:56:17.164: E/AndroidRuntime(1122): java.lang.NullPointerException
07-16 13:56:17.164: E/AndroidRuntime(1122): at java.net.URI.parseURI(URI.java:353)
07-16 13:56:17.164: E/AndroidRuntime(1122): at java.net.URI.<init>(URI.java:204)
07-16 13:56:17.164: E/AndroidRuntime(1122): at java.net.URI.create(URI.java:725)
07-16 13:56:17.164: E/AndroidRuntime(1122): at org.apache.http.client.methods.HttpPost.<init>(HttpPost.java:79)
07-16 13:56:17.164: E/AndroidRuntime(1122): at name.company.testerfield.URLBuilder.postLoginData(URLBuilder.java:57)
07-16 13:56:17.164: E/AndroidRuntime(1122): at name.company.testerfield.URLBuilder.onClick(URLBuilder.java:50)
07-16 13:56:17.164: E/AndroidRuntime(1122): at android.view.View.performClick(View.java:3480)
07-16 13:56:17.164: E/AndroidRuntime(1122): at android.view.View$PerformClick.run(View.java:13983)
07-16 13:56:17.164: E/AndroidRuntime(1122): at android.os.Handler.handleCallback(Handler.java:605)
07-16 13:56:17.164: E/AndroidRuntime(1122): at android.os.Handler.dispatchMessage(Handler.java:92)
07-16 13:56:17.164: E/AndroidRuntime(1122): at android.os.Looper.loop(Looper.java:137)
07-16 13:56:17.164: E/AndroidRuntime(1122): at android.app.ActivityThread.main(ActivityThread.java:4340)
07-16 13:56:17.164: E/AndroidRuntime(1122): at java.lang.reflect.Method.invokeNative(Native Method)
07-16 13:56:17.164: E/AndroidRuntime(1122): at java.lang.reflect.Method.invoke(Method.java:511)
07-16 13:56:17.164: E/AndroidRuntime(1122): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-16 13:56:17.164: E/AndroidRuntime(1122): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-16 13:56:17.164: E/AndroidRuntime(1122): at dalvik.system.NativeStart.main(Native Method)
07-16 13:56:17.204: W/ActivityManager(93): Force finishing activity name.company.testerfield/.URLBuilder
07-16 13:56:17.204: W/WindowManager(93): Failure taking screenshot for (180x300) to layer 21010
07-16 13:56:17.344: I/WindowManager(93): createSurface Window{41642a88 paused=false}: DRAW NOW PENDING
07-16 13:56:17.724: W/ActivityManager(93): Activity pause timeout for ActivityRecord{4133b488 name.company.testerfield/.URLBuilder}
07-16 13:56:17.743: W/NetworkManagementSocketTagger(93): setKernelCountSet(10005, 1) failed with errno -2
07-16 13:56:17.814: I/WindowManager(93): createSurface Window{41622c28 com.android.launcher/com.android.launcher2.Launcher paused=false}: DRAW NOW PENDING
07-16 13:56:18.694: W/NetworkManagementSocketTagger(93): setKernelCountSet(10040, 0) failed with errno -2
07-16 13:56:28.634: W/ActivityManager(93): Activity destroy timeout for ActivityRecord{4133b488 name.company.testerfield/.URLBuilder}
編集：他の要件について言及する必要があります：-コンテンツタイプを「application / json;」として設定します。charset=utf-8″ - 応答の一部として Cookie を受け取ります
ありがとう