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我正面臨一個問題。運行應用程序後，我設置的文本視圖不會顯示。這是我的代碼：android textview settext不顯示
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView rangeLabel = (TextView) findViewById(R.id.range_label);
final TextView beaconMacAddressLabel = (TextView) findViewById(R.id.beacon_mac_address_label);
final TextView beaconUuidLabel = (TextView) findViewById(R.id.beacon_uuid_label);
final TextView beaconVersionLabel = (TextView) findViewById(R.id.beacon_major_minor_label);
final TextView beaconStatsLabel = (TextView) findViewById(R.id.beacon_stats_label);
rangeLabel.setTextColor(Color.BLACK);
rangeLabel.setText(R.string.question_mark);
region = new Region("regionid", null, null, null);
beaconManager = new BeaconManager(this);
beaconManager.setRangingListener(new RangingListener() {
@Override
public void onBeaconsDiscovered(Region region, final List<Beacon> beacons) {
runOnUiThread(new Runnable() {
@Override
public void run() {
if (!beacons.isEmpty()) {
Beacon closestBeacon = beacons.get(0);
beaconMacAddressLabel.setText(getString(R.string.mac_address) + " : " + closestBeacon.getMacAddress());
beaconUuidLabel.setText(closestBeacon.getProximityUUID());
beaconVersionLabel.setText(getString(R.string.major) + ": "+closestBeacon.getMajor() +
" " + getString(R.string.minor) + ": " + closestBeacon.getMinor());
beaconStatsLabel.setText(getString(R.string.power) + ": " +
closestBeacon.getMeasuredPower() +
" " +
getString(R.string.dbm) +
" | " +
getString(R.string.rssi) +
": " + closestBeacon.getRssi());
double accuracy = Utils.computeAccuracy(closestBeacon);
switch (Utils.proximityFromAccuracy(accuracy)) {
case FAR:
rangeLabel.setText(R.string.cold);
rangeLabel.setTextColor(getResources().getColor(R.color.cold_colour));
rangeLabel.setBackgroundResource(R.drawable.cold_indicator_background);
break;
case NEAR:
rangeLabel.setText(R.string.warm);
rangeLabel.setTextColor(getResources().getColor(R.color.warm_colour));
rangeLabel.setBackgroundResource(R.drawable.warm_indicator_background);
break;
case IMMEDIATE:
rangeLabel.setText(R.string.hot);
rangeLabel.setTextColor(getResources().getColor(R.color.hot_colour));
rangeLabel.setBackgroundResource(R.drawable.hot_indicator_background);
break;
case UNKNOWN:
rangeLabel.setText(R.string.question_mark);
rangeLabel.setTextColor(Color.BLACK);
rangeLabel.setBackgroundResource(R.drawable.indicator_background);
break;
mycode有什麼問題嗎？只顯示標題（以XML設置）和可分區（在第10行設置）。沒有其他。有誰知道爲什麼？ 我試圖改變顏色，但沒有幫助。猜猜有什麼錯我的代碼
在需要的情況下，這是我的XML：
如果沒有滿足！beacons.empty（）條件，是否嘗試記錄beacons.size（）？ –