TextUtils使用

public class MainActivity extends Activity {

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

        String str1 = "";
        System.out.println(TextUtils.isEmpty(str1));	//为true

        String str2 = null;
        System.out.println(TextUtils.isEmpty(str2));	//为true

    }
}