我正在通过Deitel编码:Android如何编程示例,其中两个我的Android Studio对匿名内部类发出警告/错误。它声明片段应该是静态的。
正确的方法是什么?如果我制作静态非匿名内部类,那么没有关于该类的警告,但我不能引用非静态类变量(?另一种方法可能是创建一个单独的类(不是内部类(,但引用变量也存在同样的问题。
这个问题在示例Cannon Game,类CannonView,方法showGameOverDialog(下图(以及FlagQuiz中。
private void showGameOverDialog(final int messageId) {
final DialogFragment gameResult =
new DialogFragment() {
@Override
public Dialog onCreateDialog(Bundle bundle) {
AlertDialog.Builder builder =
new AlertDialog.Builder(getActivity());
builder.setTitle(getResources().getString(messageId));
builder.setMessage(getResources().getString(
R.string.result_format, shotsFired, totalElapsettime
));
builder.setPositiveButton(R.string.reset_game,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialogIsDisplayed = false;
newGame();
}
});
return builder.create();
}
};
activity.runOnUiThread(
new Runnable() {
@Override
public void run() {
showSystemBars();
dialogIsDisplayed = true;
gameResult.setCancelable(false);
gameResult.show(activity.getFragmentManager(), "results");
}
}
);
}
// display an AlertDialog when the game ends
private void showGameOverDialog(final int messageId) {
// DialogFragment to display game stats and start new game
final AlertDialog.Builder builder = new AlertDialog.Builder(activity);
builder.setTitle(getResources().getString(messageId));
// display number of shots fired and total time elapsed
builder.setMessage(getResources().getString(
R.string.results_format, shotsFired, totalElapsedTime));
builder.setPositiveButton(R.string.reset_game,
new DialogInterface.OnClickListener() {
// called when "Reset Game" Button is pressed
@Override
public void onClick(DialogInterface dialog,
int which) {
dialogIsDisplayed = false;
newGame(); // set up and start a new game
}
}
);
/* final DialogFragment gameResult =
new DialogFragment() {
// create an AlertDialog and return it
@Override
public Dialog onCreateDialog(Bundle bundle) {
// create dialog displaying String resource for messageId
AlertDialog.Builder builder =
new AlertDialog.Builder(getActivity());
builder.setTitle(getResources().getString(messageId));
// display number of shots fired and total time elapsed
builder.setMessage(getResources().getString(
R.string.results_format, shotsFired, totalElapsedTime));
builder.setPositiveButton(R.string.reset_game,
new DialogInterface.OnClickListener() {
// called when "Reset Game" Button is pressed
@Override
public void onClick(DialogInterface dialog,
int which) {
dialogIsDisplayed = false;
newGame(); // set up and start a new game
}
}
);
return builder.create(); // return the AlertDialog
}
};
*/
// in GUI thread, use FragmentManager to display the DialogFragment
activity.runOnUiThread(
new Runnable() {
public void run() {
final AlertDialog gameResult = builder.create();
showSystemBars();
dialogIsDisplayed = true;
gameResult.setCancelable(false); // modal dialog
// gameResult.show(activity.getFragmentManager(), "results");
gameResult.show();
}
}
);
}