The constructor AlertDialog.Builder(***) is undefined

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new AlertDialog.Builder(Example.this)                .setMessage("Saved!")                .setNeutralButton("OK", null)                .show();

满足条件是类Example是一个activity

比如:

public class Example extends Activity

如果不是上面的情况，用这样:

new AlertDialog.Builder(view.getContext())                .setMessage("Saved!")                .setNeutralButton("OK", null)                .show();

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