Android11 实现侧键打印走纸

/frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

else if (keyCode == KeyEvent.KEYCODE_F12) {

            //XCSW wenjie.gu add for Side key printer paper start

            if(down && repeatCount==0){

                Intent intentslide = new Intent("com.xcheng.printerservice.wrappaper");

        // The length of the paper can be changed by changing the int value here  for example-->intentslide.putExtra("length_paper",10);----XCSW wenjie.gu add

                intentslide.putExtra("length_paper",5);

                intentslide.addFlags(0x01000000);

                mContext.sendBroadcast(intentslide);

            }

            //XCSW wenjie.gu add for Side key printer paper end

        }

  /SlideKeyReceiver.java

package printerservice;

import android.app.Application;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.os.RemoteException;
import android.util.Log;

import javax.security.auth.callback.Callback;

public class SlideKeyReceiver extends BroadcastReceiver {
    private final String TAG="SlidekeyReceiver";
    private IPrinterCallback mCallback = null;
    private IPrinterService mPrinterService;
    private boolean mPrintConnected = false;
    private Context mContext;
    private  int paper_Len;
    @Override
    public void onReceive(Context context, Intent intent) {
         mContext=context;
         paper_Len=intent.getIntExtra("length_paper",5);
        if(mPrinterService==null){
            onPrinterStart();

        }

    }

    public void onPrinterStart(){
        mCallback = new IPrinterCallback.Stub() {
            @Override
            public void onException(int code, final String msg) throws RemoteException {
                Log.w(TAG, "onException("+ code+","+msg+")");
            }
            @Override
            public void onLength(long current, long total) throws RemoteException {

            }
            public void onComplete() {
                Log.i(TAG, "onComplete()");
            }
            @Override
            public void onRealLength(double realCurrent, double realTotal) throws RemoteException {

            }
        };
        Intent intent=new Intent();
        intent.setPackage("com.xcheng.printerservice");
        intent.setAction("com.xcheng.printerservice.IPrinterService");
        mContext.startService(intent);
        mContext.getApplicationContext().bindService(intent, mConnectionService, Context.BIND_AUTO_CREATE);

    }
    private ServiceConnection mConnectionService = new ServiceConnection() {
        @Override
        public void onServiceDisconnected(ComponentName name) {
            mPrinterService = null;
        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            mPrinterService = IPrinterService.Stub.asInterface(service);
            onPrinterConnected();
            if(printerPaper()){
                Wrappaper(paper_Len,mCallback);
           }
        }
    };
    public void onPrinterConnected(){
        printerInit();
        mPrintConnected = true;
    }
    public void printerInit(){
        try {
            if(mPrinterService!=null){
                mPrinterService.printerInit(mCallback);
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    public boolean printerPaper(){
        try {
            if(mPrinterService!=null){
                return mPrinterService.printerPaper(mCallback);
            }
        }catch(Exception e){

        }
        return false;
    }
    public void Wrappaper(int n ,IPrinterCallback callback){
        try {
            if(mPrinterService!=null){
                mPrinterService.printWrapPaper(n,callback);
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }


}

AndroidManifest.xml

<receiver android:name=".SlideKeyReceiver">
    <intent-filter>
        <action android:name="com.printerservice.wrappaper"/>
    </intent-filter>
</receiver>