多くの静的な便利なメソッドを持つクラスがあります。そのうちの 1 つは BroadcastReceiver を動的に開始する必要がありますが、常に InstantiationException を返します。BroadcastReceiver にはパラメーターのないコンストラクターがあるため、機能するはずですが、機能しません。これが私がこれまでにしたことです:
クラスの便利なメソッドは次のとおりです。
// Static convenience methods in a tools class
public class MyTools {
// Start BroadcastReceiver dynamically
public static BroadcastReceiver startBroadcastReceiver(Context context,
Class<? extends BroadcastReceiver> receiverClass, String receiverTag) {
BroadcastReceiver receiver = null;
try {
receiver = (BroadcastReceiver) receiverClass.newInstance();
if (receiver != null) {
IntentFilter intentFilter = new IntentFilter(receiverTag);
if (intentFilter != null) {
context.registerReceiver(receiver, intentFilter);
}
}
} catch (Exception exception) {
// --> InstantiationException
}
return receiver;
}
// ...
}
この便利なメソッドで BroadcastReceiver を開始しようとする InnerClass BroadcastReceiver のアクティビティを次に示します。
// An activity with an InnerClass BroadcastReceiver
public class MyActivity extends Activity {
public class MyBroadcastReceiver extends BroadcastReceiver {
public static final String TAG = "aa.bb.cc.MyActivity.MyBroadcastReceiver";
public static final long ACTION_UNDEFINED = 0;
public static final long ACTION_DOSOMETHING = 1;
@Override
public void onReceive(Context context, Intent intent) {
if (intent != null) {
Bundle bundleExtras = intent.getExtras();
if (bundleExtras != null) {
long action = bundleExtras.getLong("ACTION");
if (action == ACTION_DOSOMETHING) {
doSomething();
}
}
}
}
}
private MyBroadcastReceiver receiver;
@Override
protected void onResume() {
super.onResume();
// Start BroadcastReceiver
receiver = (MyBroadcastReceiver) MyTools.startBroadcastReceiver(this,
MyBroadcastReceiver.class, MyBroadcastReceiver.TAG);
}
public void doSomething() {
// ...
}
}
このアプローチの何が問題なのですか?
どんな助けでも大歓迎です。