Android SharedPreferences HashSet练习

Android SharedPreferences  HashSet练习

SharedPreferences sp = this.getSharedPreferences("xxx.xml", MODE_PRIVATE);
不需要文件扩展名

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        t2();
    }

    protected void t1() {
        SharedPreferences sp = this.getSharedPreferences("xxx.xml", MODE_PRIVATE);
        SharedPreferences.Editor spe = sp.edit();
        spe.putBoolean("a", true);
        spe.putFloat("f", 2222.999f);
        spe.putInt("int", new Integer(22));
        spe.putString("String", "testXML");
        Set<String> xx = new HashSet<String>();
        xx.add("a");
        xx.add("b");
        xx.add("c");
        xx.add("d");
        spe.putStringSet("set", xx);
        spe.commit();
    }

    protected void t2() {
        SharedPreferences sp = getSharedPreferences("xxx.xml", MODE_PRIVATE);
        TextView tv = (TextView) findViewById(R.id.t1);
        HashSet<String> sset = (HashSet<String>) sp.getStringSet("set", null);
        Iterator<String> index = sset.iterator();
        while (index.hasNext()) {
            String temp = index.next();
            if (temp.equals("a")) {
                System.out.println(temp);
            }
        }
        System.out.println(sp.getBoolean("a",true));
        System.out.println(sp.getFloat("f",0));
        System.out.println(sp.getInt("int",0));
        System.out.println(sp.getInt("int",0));
    }
}