私はAndroid DevelopersのWebサイトでチュートリアルを実行しましたが、自分のサービスをバインドするアクティビティを取得できません。cantはサービスにバインドします
package com.dieselboris.motioncapture;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.dieselboris.motioncapture.LocalService.LocalBinder;
public class HelloMotionCaptureActivity extends Activity implements OnClickListener {
private TextView textBox;
LocalService mService;
boolean mBound = false;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
textBox = (TextView) findViewById(R.id.textView1);
}
@Override
protected void onStart() {
super.onStart();
// Bind to LocalService NEVER RETURNS TRUE!!!!
Intent intent = new Intent(this, LocalService.class);
boolean isBound = bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
String text = Boolean.toString(isBound);
textBox.setText(text);
}
@Override
protected void onStop() {
super.onStop();
// Unbind from the service
if (mBound) {
unbindService(mConnection);
mBound = false;
}
}
//start the service when clicked
public void onClick(View v) {
if (v == startButton)
{
//NEVER IN HERE
if (mBound) {
int num = mService.getRandomNumber();
Toast.makeText(this, "incoming number: " + num, Toast.LENGTH_LONG).show();
}
Toast.makeText(this, "the service should run now", Toast.LENGTH_LONG).show();
}
}
/** Defines callbacks for service binding, passed to bindService() */
private ServiceConnection mConnection = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className,
IBinder service) {
// We've bound to LocalService, cast the IBinder and get LocalService instance
LocalBinder binder = (LocalBinder) service;
mService = binder.getService();
mBound = true;
if (mBound) {
// Call a method from the LocalService.
// However, if this call were something that might hang, then this request should
// occur in a separate thread to avoid slowing down the activity performance.
int num = mService.getRandomNumber();
String text = Integer.toString(num);
textBox.setText(text);
}
}
@Override
public void onServiceDisconnected(ComponentName arg0) {
mBound = false;
}
};
}
私がに接続しようとするサービス:
ERROR/AndroidRuntime(10878):致命的な例外:メイン
package com.dieselboris.motioncapture; import java.util.Random; import android.app.Service; import android.content.Intent; import android.os.Binder; import android.os.IBinder; public class LocalService extends Service { // Binder given to clients private final IBinder mBinder = new LocalBinder(); // Random number generator private final Random mGenerator = new Random(); /** * Class used for the client Binder. Because we know this service always * runs in the same process as its clients, we don't need to deal with IPC. */ public class LocalBinder extends Binder { LocalService getService() { // Return this instance of LocalService so clients can call public methods return LocalService.this; } } @Override public IBinder onBind(Intent intent) { return mBinder; } /** method for clients */ public int getRandomNumber() { return mGenerator.nextInt(100); } }
を私はエミュレータからの次の出力を取得しますERROR/AndroidRuntime(10878):java.lang.NullPointerException
ERROR/AndroidRuntime(10878):com.dieselboris.motioncapture.HelloMotionCapturでeActivity.onClick(HelloMotionCaptureActivity.java:66)
ERROR/AndroidRuntime(10878):android.view.View.performClick(View.java:2408)で
ERROR/AndroidRuntime(10878):でandroid.view.View $ PerformClick.run(View.java:8817)
ERROR/AndroidRuntime(10878):android.os.Handler.handleCallback(Handler.java:587)
ERROR/AndroidRuntime(10878):android.os.Handler。 DispatchMessageを(Handler.java:92)
ERROR/AndroidRuntime(10878):android.app.ActivityThread.mainで(:android.os.Looper.loop(Looper.java:144)
ERROR/AndroidRuntime(10878)で、 ActivityThread.java:4937)
ERROR/AndroidRuntime( 10878):java.lang.reflect.Method.invokeNative(ネイティブメソッド)で
ERROR/AndroidRuntime(10878):java.lang.reflect.Method.invoke(Method.java:521)
ERROR/AndroidRuntimeで(10878 ):com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:868)
ERROR/AndroidRuntime(10878):com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) )
ERROR/AndroidRuntime(10878):dalvik.system.NativeStart.main(ネイティブメソッド)
で、初期化される前、私がサービスからパブリックメソッドを呼び出すか、接続がまだ設定されていないようです。
私は開発者サイトの例を慎重に踏襲し、私が間違っていることを理解できません。