我的問題是，當我運行 android 應用程式時，如果列印機處于脫機狀態，此方法需要一分鐘才能運行。我想在后臺的另一個執行緒上運行它，并且原始執行緒可以不間斷地運行。感謝您的任何建議，快樂編碼！
public class MainActivity extends WebView {
public PrinterManager printerManager;
public final int REQUEST_COARSE_LOCATION_PERMISSIONS = 52;
private JSPlugin plugin;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mBluetoothReceiver, filter);
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case REQUEST_COARSE_LOCATION_PERMISSIONS: {
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//printerManager.connectDefaultPrinter(0);
//printerManager.connectDefaultPrinter(1);
printerManager.connectAll(); <----- This method call i want to do in new thread
} else {
Toast.makeText(this,
"NO Bluetooth RIGHTS",
Toast.LENGTH_LONG).show();
}
return;
}
}
}
uj5u.com熱心網友回復：
您可以簡單地創建一個 Thread 物件并將您的方法放入其中。
這里的代碼應該適用于您的情況：
public class MainActivity extends WebView {
public PrinterManager printerManager;
public final int REQUEST_COARSE_LOCATION_PERMISSIONS = 52;
private JSPlugin plugin;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
IntentFilter filter = new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED);
registerReceiver(mBluetoothReceiver, filter);
}
@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
switch (requestCode) {
case REQUEST_COARSE_LOCATION_PERMISSIONS: {
if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
ConnectingThread connectingThread = new ConnectingThread();
connectingThread.start();
} else {
Toast.makeText(this, "NO Bluetooth RIGHTS", Toast.LENGTH_LONG).show();
}
return;
}
}
}
private class ConnectingThread extends Thread {
public ConnectingThread() {
}
public void run() {
// You can set a low priority, if you want, using:
//Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
printerManager.connectAll();
}
}
}
根據您的管理需要，您可以決定將connectingThread 的定義放在不同的位置。
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