android从textview保存一个值

Question

我制作了一个简单的计数应用程序，其中包含包含计数数字的“文本”视图，并且我想保存计数数字，以便在我关闭该应用程序时，计数数字应该在其中。

Answer 1

You should use SharedPreferences . Save the count to preference every time it is updated. Read and load the saved value in TextView when app starts next time.

Answer 2

The best solution for your problem is to use SharedPreference. create another class called SaveCounterValue and copy the following code to that class

public class SaveCounterValue {

static final String PREF_COUNTER= "counter";
static SharedPreferences getSharedPreferences(Context ctx) {
    return PreferenceManager.getDefaultSharedPreferences(ctx);
}

public static void setCounter(Context ctx, int counter)
{
    SharedPreferences.Editor editor = getSharedPreferences(ctx).edit();
    editor.putInt(PREF_COUNTER, counter);
    editor.commit();
}

public static Long getCounter(Context ctx)
{
    return getSharedPreferences(ctx).getInt(PREF_COUNTER, 0);
}

}

Then in your activity after conter++ you copy the below code

SaveCounterValue.setConuter(context, counter);