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public abstract class MyHandler extends Handler {
       public static final int SUCCESS = 0;    public static final int FAILURE = 1;    public abstract void onSuccess(String content);    public abstract void onFailure(String content) ;    @Override    public void handleMessage(Message msg) {        String content = (String) msg.obj;        switch (msg.what) {        case SUCCESS:            onSuccess(content);            break;        case FAILURE:            onFailure(content);            break;        default:            break;        }    }}

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