クラスでエラーが発生する理由plainText = mService.getPlainText(key, cipherText);がわかりません。crackingProcessに行を入れると、buttonclick動作します。誰が私に何が間違っているのか説明できますか?
public class CrackingProcess extends Activity {
TextView message;
TextView result;
DesService mService;
boolean mBound = false;
Button btnStop;
String[] stringResult;
String key;
String cipherText;
String plainText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cracking_process);
message = (TextView) findViewById(R.id.message);
btnStop = (Button) findViewById(R.id.btnStop);
result = (TextView) findViewById(R.id.result);
message.setText("Cracking In Progress...");
doBindService();
}
@Override
protected void onStart() {
super.onStart();
try {
AssetManager fileManager = getAssets();
InputStream fileInput = fileManager.open("json_block56");
Reader fileRead = new InputStreamReader(fileInput);
JsonReader reader = new JsonReader(fileRead);
stringResult = readJson(reader);
key = stringResult[1];
Log.d("key", key);
cipherText = stringResult[2];
Log.d("text", cipherText);
plainText = mService.getPlainText(key, cipherText); // This line cause error
result.setText(plainText);
} catch (IOException e) {
e.printStackTrace();
}
btnStop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if (mBound) {
unbindService(mConnection);
mBound = false;
}
finish();
}
});
}
private String[] readJson(JsonReader reader) throws IOException {
String[] array = new String[3];
String type = "";
String key = "";
String cipherText = "";
// ArrayList<String> result = null;
reader.beginObject();
while (reader.hasNext()) {
String name = reader.nextName();
if (name.equals("reply")) {
reader.beginObject();
while (reader.hasNext()) {
String newName = reader.nextName();
if (newName.equals("type"))
type = reader.nextString();
else if (newName.equals("key"))
key = reader.nextString();
else if (newName.equals("ciphertext"))
cipherText = reader.nextString();
else
reader.skipValue();
}
reader.endObject();
} else
reader.skipValue();
}
reader.endObject();
array[0] = type;
array[1] = key;
array[2] = cipherText;
return array;
}
public ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
mService = ((DesService.LocalBinder)service).getService();
mBound = true;
}
@Override
public void onServiceDisconnected(ComponentName name) {
mService = null;
//mBound = false;
}
};
void doBindService() {
Intent intent = new Intent(this, DesService.class);
startService(intent);
boolean bound = bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
if ( bound ) {
Log.d( "Sucess", "Successfully bound to service" );
}
else {
Log.d( "Fail", "Failed to bind service" );
}
}
}
DESService クラス
public class DesService extends Service {
private final IBinder mBinder = new LocalBinder();
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
// TODO Auto-generated method stub
return super.onStartCommand(intent, flags, startId);
}
public class LocalBinder extends Binder {
public DesService getService() {
return DesService.this;
}
}
public String getPlainText(String key, String cipherText) {
return "testing";
}
}
LogCat
10-05 18:29:13.893: D/AndroidRuntime(8026): Shutting down VM
10-05 18:29:13.893: W/dalvikvm(8026): threadid=1: thread exiting with uncaught exception (group=0xa62c5288)
10-05 18:29:13.897: E/AndroidRuntime(8026): FATAL EXCEPTION: main
10-05 18:29:13.897: E/AndroidRuntime(8026): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.androiddes/com.example.androiddes.CrackingProcess}: java.lang.NullPointerException
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059)
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.app.ActivityThread.access$600(ActivityThread.java:130)
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.os.Handler.dispatchMessage(Handler.java:99)
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.os.Looper.loop(Looper.java:137)
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.app.ActivityThread.main(ActivityThread.java:4745)
10-05 18:29:13.897: E/AndroidRuntime(8026): at java.lang.reflect.Method.invokeNative(Native Method)
10-05 18:29:13.897: E/AndroidRuntime(8026): at java.lang.reflect.Method.invoke(Method.java:511)
10-05 18:29:13.897: E/AndroidRuntime(8026): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
10-05 18:29:13.897: E/AndroidRuntime(8026): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
10-05 18:29:13.897: E/AndroidRuntime(8026): at dalvik.system.NativeStart.main(Native Method)
10-05 18:29:13.897: E/AndroidRuntime(8026): Caused by: java.lang.NullPointerException
10-05 18:29:13.897: E/AndroidRuntime(8026): at com.example.androiddes.CrackingProcess.onStart(CrackingProcess.java:63)
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.app.Activity.performStart(Activity.java:5018)
10-05 18:29:13.897: E/AndroidRuntime(8026): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2032)
10-05 18:29:13.897: E/AndroidRuntime(8026): ... 11 more