如何减少此代码重复

Question

我坚持如何减少代码重复,我使用TextToSpeech引擎并使用语言环境,以便用户可以选择他们的语言.

language 是一个旋转器.

language.setOnItemSelectedListener(new OnItemSelectedListener() {

    public void onItemSelected(AdapterView<?> parent, View arg1,
        int pos, long id) {
    System.out.println(parent.getItemAtPosition(pos).toString());
    if (parent.getItemAtPosition(pos).toString().equals("UK")) {
        textToSpeech = new TextToSpeech(MainActivity.this,
            new TextToSpeech.OnInitListener() {

            @Override
            public void onInit(int status) {
                if (status != TextToSpeech.ERROR) {
                textToSpeech.setLanguage(Locale.UK);
                }
            }
            });
    } else if (parent.getItemAtPosition(pos).toString()
        .equals("US")) {
        textToSpeech = new TextToSpeech(MainActivity.this,
            new TextToSpeech.OnInitListener() {

            @Override
            public void onInit(int status) {
                if (status != TextToSpeech.ERROR) {
                textToSpeech.setLanguage(Locale.US);
                }
            }
            });

    } else if (parent.getItemAtPosition(pos).toString()
        .equals("French")) {
        textToSpeech = new TextToSpeech(MainActivity.this,
            new TextToSpeech.OnInitListener() {

            @Override
            public void onInit(int status) {
                if (status != TextToSpeech.ERROR) {
                textToSpeech.setLanguage(Locale.FRANCE);
                }
            }
            });

    } else if (parent.getItemAtPosition(pos).toString()
        .equals("Italian")) {
        textToSpeech = new TextToSpeech(MainActivity.this,
            new TextToSpeech.OnInitListener() {

            @Override
            public void onInit(int status) {
                if (status != TextToSpeech.ERROR) {
                textToSpeech
                    .setLanguage(Locale.ITALIAN);
                }
            }
            });

    } else if (parent.getItemAtPosition(pos).toString()
        .equals("German")) {
        textToSpeech = new TextToSpeech(MainActivity.this,
            new TextToSpeech.OnInitListener() {

            @Override
            public void onInit(int status) {
                if (status != TextToSpeech.ERROR) {
                textToSpeech
                    .setLanguage(Locale.GERMAN);
                }
            }
            });

    }

    }

    public void onNothingSelected(AdapterView<?> arg0) {
    // TODO Auto-generated method stub

    }
});
}

Answer 1

将TextToSpeech对象的创建提取到单独的函数中:

private TextToSpeech createTextToSpeech(final Locale loc) {
    return new TextToSpeech(MainActivity.this,  
        new TextToSpeech.OnInitListener() {  

        @Override  
        public void onInit(int status) {  
            if (status != TextToSpeech.ERROR) {  
                setLanguage(loc);  
            }  
        }  
    });  
}

请注意,loc必须声明参数final,以便可以在匿名类中使用它.

用法:

...
} else if (parent.getItemAtPosition(pos).toString().equals("French")) {   
    textToSpeech = createTextToSpeech(Locale.FRANCE);
} ...