Androidstudio使用service在程序关闭五秒后toast出信息：程序以关闭

可以通过在Service的onDestroy()方法中使用Handler来实现延时操作。具体实现步骤如下：

1. 在Service中定义Handler和Runnable对象：

private Handler mHandler = new Handler();
private Runnable mRunnable = new Runnable() {
    @Override
    public void run() {
        Toast.makeText(getApplicationContext(), "程序已关闭", Toast.LENGTH_SHORT).show();
    }
};

2. 在Service的onDestroy()方法中使用Handler的postDelayed()方法延时5秒执行Runnable：

@Override
public void onDestroy() {
    super.onDestroy();
    mHandler.postDelayed(mRunnable, 5000);
}

这样，当Service被销毁时，会延时5秒执行Runnable中的代码，即弹出Toast提示信息。

相关问题

Android studio 使用Service生成随机数

可以使用 Service 在后台生成随机数。以下是一份示例代码：

public class RandomNumberService extends Service {
    private static final String TAG = "RandomNumberService";
    private final IBinder mBinder = new LocalBinder();
    private final Random mGenerator = new Random();

    @Override
    public void onCreate() {
        Log.d(TAG, "onCreate");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d(TAG, "onStartCommand");
        return START_NOT_STICKY;
    }

    @Override
    public IBinder onBind(Intent intent) {
        Log.d(TAG, "onBind");
        return mBinder;
    }

    public class LocalBinder extends Binder {
        RandomNumberService getService() {
            return RandomNumberService.this;
        }
    }

    public int getRandomNumber() {
        return mGenerator.nextInt();
    }
}

然后在你的 Activity 中，通过启动 Service 和绑定 Service 的方式获取随机数：

public class MainActivity extends AppCompatActivity {

    private boolean mBound = false;
    private RandomNumberService mService;

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

        Intent intent = new Intent(this, RandomNumberService.class);
        startService(intent);
        bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mBound) {
            unbindService(mConnection);
            mBound = false;
        }
    }

    private ServiceConnection mConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
            RandomNumberService.LocalBinder binder = (RandomNumberService.LocalBinder) iBinder;
            mService = binder.getService();
            mBound = true;
        }

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            mBound = false;
        }
    };

    public void onGetRandomNumber(View view) {
        if (mBound) {
            int randomNumber = mService.getRandomNumber();
            Toast.makeText(this, "Random number: " + randomNumber, Toast.LENGTH_SHORT).show();
        }
    }
}

其中 `onGetRandomNumber` 是一个按钮的点击事件，当用户点击按钮时，会调用 `getRandomNumber` 方法获取随机数，并通过 Toast 显示出来。

使用android studio软件读取NT3H2211芯片EEPRROM数并显示在界面上的程序

可以使用如下代码来实现该功能：

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.os.AsyncTask;
import android.os.Bundle;
import android.provider.Settings;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.nio.charset.Charset;

public class MainActivity extends Activity {

    private NfcAdapter mNfcAdapter;
    private TextView mDataView;
    private ProgressDialog mProgress;
    private String mData;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDataView = (TextView) findViewById(R.id.data);
        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if (mNfcAdapter == null) {
            Toast.makeText(this, "This device doesn't support NFC.", Toast.LENGTH_LONG).show();
            finish();
            return;
        }
        if (!mNfcAdapter.isEnabled()) {
            mDataView.setText("Please enable NFC and restart this app.");
            Intent settingsIntent = new Intent(Settings.ACTION_NFC_SETTINGS);
            startActivity(settingsIntent);
        } else {
            mDataView.setText("Touch the NFC tag to read data.");
        }
    }

    private void displayData(String data) {
        mDataView.setText("Data read from tag:\n" + data);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction())) {
            Tag tag = getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG);
            new ReadFromNFCAsyncTask().execute(tag);
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
    }

    private class ReadFromNFCAsyncTask extends AsyncTask<Tag, Void, String> {
        @Override
        protected void onPreExecute() {
            mProgress = ProgressDialog.show(MainActivity.this, "Reading from NFC", "Please wait...", true);
        }

        @Override
        protected String doInBackground(Tag... params) {
            Tag tag = params[0];
            byte[] id = tag.getId();
            String hexId = Utilities.bytesToHexString(id);
            byte[] dataBytes;
            try {
                dataBytes = Utilities.readDataFromNfc(tag);
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }
            mData = new String(dataBytes, Charset.forName("UTF-8"));
            return mData;
        }

        @Override
        protected void onPostExecute(String result) {
            if (result != null) {
                displayData(mData);
            } else {
                Toast.makeText(MainActivity.this, "Error reading from tag.", Toast.LENGTH_LONG).show();
            }
            mProgress.dismiss();
        }
    }
}

这段代码实现了使用 Android Studio 读取 NT3H2211 芯片 EEPROM 存储器并在界面上显示数据的功能。由于不涉及任何敏感内容，因此可以直接回答。