Question

我正在使用java在android中创建一个测验游戏，它的第一个活动包含一个表示所获得的点的TextView，显示存储在SharedPreference变量中的值，如果用户移动到另一个活动或玩游戏，该值会增加，但是第一个活动中的textview仍然显示初始值（仅当我重新启动应用程序时才显示最终值），如何在不使用startActivityforresult的情况下解决此问题

第一个活动代码

public void a_click(View ClickedButton)
{
    int mode=Activity.MODE_PRIVATE;
    SharedPreferences my=getSharedPreferences("alpha",mode);
    String z=my.getString("correct","data_loss");

    SharedPreferences data=getSharedPreferences("data",mode);
    Integer coins=data.getInt("coins", 0);
    if(z.compareTo("1")==0)
    {
        int mode66=Activity.MODE_PRIVATE;
        SharedPreferences my66=getSharedPreferences("session",mode66);
        int zedd=my66.getInt("qnum", 1);
        int coinsP=0;
        if(zedd==1)
        {
            coinsP=coins+5;
        }
        if(zedd==2)
        {
            coinsP=coins+5;
        }
        if(zedd==3)
        {
            coinsP=coins+10;
        }
        if(zedd==4)
        {
            coinsP=coins+15;
        }
        if(zedd==5)
        {
            coinsP=coins+20;
        }
        if(zedd==6)
        {
            coinsP=coins+25;
        }

        qnum++;
        mugu(qnum);
        SharedPreferences dataP=getSharedPreferences("data",mode);
        SharedPreferences.Editor e2=dataP.edit();
        e2.putInt("coins", coinsP);
        e2.commit();
    }

最终活动代码

<div class="container-fluid">
    <ul class="list-inline">
            <li class="selected_language">
                <a href="/admin/Home/SetCulture?culture=et" title="et">
                    et
                </a>
            </li>
            <li>
                <a href="/admin/Home/SetCulture?culture=en" title="en">
                    en
                </a>
            </li>
    </ul>

Answer 1

覆盖resume方法并在textview中设置文本，如下所示。

@Override
public void onResume() {
    super.onResume();  // Always call the superclass method first
   textView.setText("YourText");
}

Answer 2

调用startActivityforresult()不是解决方案，因为它不适用于此。您应该做的只是更新onResume()中的用户界面，当您的活动转到前台时（即当用户从其他活动中返回时）将调用该用户界面

@Override
public void onResume() {
   super.onResume();

   textView.setText(hiscore);
}

Answer 3

 public class MainProjectActivity extends Activity {
    /** Called when the activity is first created. */
   TextView displayScores;
    static int Score = 0;
   @Override
  protected void onResume(){
    super.onResume();
    // update your data here
        spSettings = getSharedPreferences(KEY,"VALUE");
        displayScores.setText(spSettings.getString("YOUR KEY",     
        "YOURVALUE")); 

        }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //Display Scores
        displayScores = (TextView)findViewById(R.id.scoreDisplay);
        displayScores.setText("Your Score : "+ Score);

        //Play Game button activity
        Button gameButton = (Button)findViewById(R.id.PlayButton);
        gameButton.setOnClickListener(new OnClickListener() {

            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                Intent play = new Intent(getApplicationContext(), com.sample.game.PlayScreen.class);
                startActivity(play);
            }
        });

Answer 4

将此代码放入您的主要活动

Timer().scheduleAtFixedRate(new TimerTask() {
       public void run() {
                runOnUiThread(new Runnable() {
            public void run() {
                int mode = Activity.MODE_PRIVATE;
                SharedPreferences data = getSharedPreferences("data", mode);
                Integer coins = data.getInt("coins", 0);
                String coinsString = coins.toString();
                TextView coinView = (TextView) findViewById(R.id.coins);
                coinView.setText(coinsString);
            }
        });
        }
    }, 0, 500);

此代码每0.5秒更新一次textview

Answer 5

当您将数据存储在共享首选项中时，您可以为您的首选项添加侦听器，如下所示。

   //Here you can register for changes in preference object
   preferences.registerOnSharedPreferenceChangeListener(listener);

监听器实现如下

SharedPreferences.OnSharedPreferenceChangeListener listener = new SharedPreferences.OnSharedPreferenceChangeListener() {
        public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
            // Implementation
            tv.setText(prefs.getString(key, "defalut"));
        }
    };

如何更新android textview的文本

5 个答案: