Android 将变量从公共 void 传递给 onCreate答案

【问题标题】：Android passing a variable from a public void to onCreateAndroid 将变量从公共 void 传递给 onCreate
【发布时间】：2012-04-29 17:43:18
【问题描述】：

我想从公共空白中获取一个字符串并进入我的 onCreate，以便我可以记录它以检查哈希是否有效。但我不知道该怎么做

这是我的代码

public class ChooseTeamActivity extends ListActivity {

    private static final String apiKey = "4545ggg454hfnf7557kfdkgg454"; 
    private static final String apiUser = "AndroidUser"; 

    long unixTimeStamp = System.currentTimeMillis() / 1000L;

    String newFeedRequest = "1.0/evoStructure?timestamp=" + unixTimeStamp;
    String fixturesFeedURL = "https://secure.TestSite.com/_services/api/" + newFeedRequest;

    public void hash() throws NoSuchAlgorithmException, UnsupportedEncodingException{

        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(fixturesFeedURL.getBytes("UTF-8"));
        byte[] digest = md.digest();
        String strhash = new String(digest);

    }   



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

    setContentView(R.layout.chooseact);


     Log.v("myApp", fixturesFeedURL);
     Log.v("myApp", strhash);



    }

}

【问题讨论】：

在你的 onCreate 中调用这个 hash() 方法。

标签： java android public void oncreate

【解决方案1】：

我从你的问题中得到的尝试使用这种方式

private static final String apiKey = "4545ggg454hfnf7557kfdkgg454"; 
private static final String apiUser = "AndroidUser"; 
String strhash="";
long unixTimeStamp = System.currentTimeMillis() / 1000L;

String newFeedRequest = "1.0/evoStructure?timestamp=" + unixTimeStamp;
String fixturesFeedURL = "https://secure.TestSite.com/_services/api/" + newFeedRequest;

public void hash() throws NoSuchAlgorithmException, UnsupportedEncodingException{

    MessageDigest md = MessageDigest.getInstance("SHA-256");
    md.update(fixturesFeedURL.getBytes("UTF-8"));
    byte[] digest = md.digest();
    strhash = new String(digest);

}   



@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);

setContentView(R.layout.chooseact);


 Log.v("myApp", fixturesFeedURL);
 Log.v("myApp", strhash);

}}

【讨论】：

【解决方案2】：

试试这个：

 public class ChooseTeamActivity extends ListActivity {

    private static final String apiKey = "4545ggg454hfnf7557kfdkgg454"; 
    private static final String apiUser = "AndroidUser"; 

    long unixTimeStamp = System.currentTimeMillis() / 1000L;

    String newFeedRequest = "1.0/evoStructure?timestamp=" + unixTimeStamp;
    String fixturesFeedURL = "https://secure.TestSite.com/_services/api/" + newFeedRequest;
    String strHash = null;
    public void hash() throws NoSuchAlgorithmException, UnsupportedEncodingException{

        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(fixturesFeedURL.getBytes("UTF-8"));
        byte[] digest = md.digest();
        strHash = new String(digest);

    }   



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

    setContentView(R.layout.chooseact);

     hash();
     Log.v("myApp", fixturesFeedURL);
     Log.v("myApp", strhash);



    }

}

或：

public class ChooseTeamActivity extends ListActivity {

    private static final String apiKey = "4545ggg454hfnf7557kfdkgg454"; 
    private static final String apiUser = "AndroidUser"; 

    long unixTimeStamp = System.currentTimeMillis() / 1000L;

    String newFeedRequest = "1.0/evoStructure?timestamp=" + unixTimeStamp;
    String fixturesFeedURL = "https://secure.TestSite.com/_services/api/" + newFeedRequest;

    public String hash() throws NoSuchAlgorithmException, UnsupportedEncodingException{

        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(fixturesFeedURL.getBytes("UTF-8"));
        byte[] digest = md.digest();
        return new String(digest);

    }   



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

    setContentView(R.layout.chooseact);

     String strhash = hash();
     Log.v("myApp", fixturesFeedURL);
     Log.v("myApp", strhash);



    }

}

【讨论】：

【解决方案3】：

我想你想这样做......

public class ChooseTeamActivity extends ListActivity {

    private static final String apiKey = "4545ggg454hfnf7557kfdkgg454"; 
    private static final String apiUser = "AndroidUser"; 

    long unixTimeStamp = System.currentTimeMillis() / 1000L;

    String newFeedRequest = "1.0/evoStructure?timestamp=" + unixTimeStamp;
    String fixturesFeedURL = "https://secure.TestSite.com/_services/api/" + newFeedRequest;

    public void hash() throws NoSuchAlgorithmException, UnsupportedEncodingException{

        MessageDigest md = MessageDigest.getInstance("SHA-256");
        md.update(fixturesFeedURL.getBytes("UTF-8"));
        byte[] digest = md.digest();
        String strhash = new String(digest);

     Log.v("myApp", fixturesFeedURL);
     Log.v("myApp", strhash);
    }   



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

    setContentView(R.layout.chooseact);
    try{ 
     hash();
      }catch(Exception e){
       }

    }

}

【讨论】：

【解决方案4】：

只需将 Log 行放入 hash() 方法并从 onCreate 中调用：

@Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        hash();

}

public void hash(){
   Log.v("myApp", "HelloWorld");
}

【讨论】：