该方法无法获取 某些号码（Android 4.0以后google正在慢慢收回一些权限）

public class MainActivity extends Activity {	// private String TAG = "MainActivity";	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		TelephonyManager tm = (TelephonyManager) this				.getSystemService(TELEPHONY_SERVICE);		String phoneId = tm.getLine1Number();		TextView tv = (TextView) findViewById(R.id.num);		tv.setText(phoneId);		Log.e("phoneId： ", phoneId + "");	}}