如何添加服务到我的项目？

Question

我们的应用程序正在录制视频，当我们按下“开始”按钮而没有打开相机，并且在看到另一个按钮之后点击它。 我希望当我们点击“开始”按钮时，它会记录下来，但在后台（使用服务），我已经尝试过，但我没有成功。 当我点击开始时，当我关闭应用程序或转到其他应用程序时，我需要继续录制。 有人能告诉我，我该怎么办？

我的XML代码：

<TextView 
     android:id="@+id/tvTitle" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="@string/app_name" 
     android:textSize="35dp" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="10dp"/> 

    <TextView 
     android:id="@+id/tvTime" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="זמן הקלטה: " 
     android:textSize="19dp" 
     android:layout_below="@id/tvTitle" 
     android:layout_marginTop="70px" 
     android:layout_alignParentRight="true"/> 

    <EditText 
     android:id="@+id/etTime" 
     android:layout_width="500px" 
     android:layout_height="wrap_content" 
     android:layout_alignTop="@+id/tvTime" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" /> 

    <TextView 
     android:id="@+id/tvMail" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="אימייל:" 
     android:textSize="19dp" 
     android:layout_below="@id/tvTime" 
     android:layout_marginTop="70px" 
     android:layout_alignParentRight="true"/> 

    <EditText 
     android:id="@+id/etMail" 
     android:layout_width="500px" 
     android:layout_height="wrap_content" 
     android:layout_toLeftOf="@id/tvMail" 
     android:layout_alignParentLeft="true" 
     android:layout_alignTop="@id/tvMail"/> 

    <Button 
     android:id="@+id/btnStart" 
     android:layout_width="300px" 
     android:layout_height="300px" 
     android:layout_gravity="center|center" 
     android:background="@drawable/button_states" 
     android:text="Start" 
     android:textSize="25dp" 
     android:layout_marginTop="150px" 
     android:layout_centerHorizontal="true" 
     android:layout_below="@id/tvMail"/> 

    <Button 
     android:id="@+id/btnSave" 
     android:layout_width="55dp" 
     android:layout_height="55dp" 
     android:layout_gravity="center|center" 
     android:layout_marginTop="50px" 
     android:background="@drawable/button_states" 
     android:layout_alignParentBottom="true" 
     android:layout_alignParentRight="true" 
     android:layout_marginBottom="30px" 
     android:layout_marginRight="30px" 
     android:text=">" /> 

    <SurfaceView 
     android:id="@+id/surfaceView" 
     android:layout_width="0.1dp" 
     android:layout_height="0.1dp" 
     android:layout_gravity="center|center"></SurfaceView> 

，这是我的代码：

public class VideoCapture extends Activity implements SurfaceHolder.Callback{ 
public static SurfaceView cameraView; 
public static SurfaceHolder holder; 
public static Camera mCamera; 
public static boolean mPreviewRunning; 

private Button btnStart,btnSave; // buttons of the app 
private MediaRecorder recorder; // object for recording the videos 
private CamcorderProfile cpHigh; 
private boolean recording,savingEvidence = false; 
private int counter; 
private EditText etTime,etMail; 
private View view; 
private String firstVideo,secondVideo; 
private Handler handler; 
private File myvideoDirectory;; // file for new directory 
private int recordTime;  // time to record in ms 
private String savePath; // string for saving the file in directory 

private final int REFRESH_VIDEOS = 1; 
private final int SAVE_EVIDENCE = 2; 
/// </Variables> 

/// <Getters and Setters functions> 
// get the counter 
public int getCounter() { 
    return counter; 
} 

// set the counter 
public void setCounter(int counter) { 
    this.counter = counter; 
} 
/// </Getters and Setters functions> 

/// <Activity's Functions> 
@Override 
protected void onResume() { 
    super.onResume(); 
} 

@Override 
protected void onStart() { 
    super.onStart(); 

} 
/// </Activity's Functions> 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
      WindowManager.LayoutParams.FLAG_FULLSCREEN); 

    // create a File object for the parent directory 
    savePath = "/sdcard/Recorder/"; 
    myvideoDirectory = new File(savePath); 
    // have the object build the directory structure, if needed. 
    if (!myvideoDirectory.exists()) 
    { 
     myvideoDirectory.mkdirs(); 
    } 

    setContentView(R.layout.main); 
    // setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 
    initHandler(); 
    // new media recorder object 
    recorder = new MediaRecorder(); 
    // init the medica recorder object 
    initRecorder(); 

    cameraView = (SurfaceView) findViewById(R.id.surfaceView); 
    holder = cameraView.getHolder(); 
    holder.addCallback(this); 
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
    //recordTime = 30000; 

    // button to record the video 
    btnStart = (Button) findViewById(R.id.btnStart); // get the Button object's id 
    btnStart.setOnClickListener(new View.OnClickListener() 
    { 
     @Override 
     // recording/stopping the video 
     public void onClick(View v) 
     { 
      /// <Variables>; 
      int timeInSeconds; 
      InputMethodManager imm; 
      /// </Variables> 

      if (!recording) // if we are not recording 
      { 
       try 
       { 
        etTime = (EditText)findViewById(R.id.etTime); // get the EdisText of the seconds to record object's id 
        etMail = (EditText)findViewById(R.id.etMail); // get the EditText of the mail to send the video 

        // toast's message to show error message of input error values 
        if(etMail.getText().toString().equals("") && etTime.getText().toString().equals("")) 
         Toast.makeText(getApplicationContext(), "Please write a valid number and email!", Toast.LENGTH_SHORT).show(); 
        else 
        { 
         if(etMail.getText().toString().equals("")) 
          Toast.makeText(getApplicationContext(), "Please write a valid email!", Toast.LENGTH_SHORT).show(); 
         else 
         { 
          if(etTime.getText().toString().equals("")) 
           Toast.makeText(getApplicationContext(), "Please write a valid number!", Toast.LENGTH_SHORT).show(); 
          else 
          { 
           timeInSeconds = Integer.parseInt(etTime.getText().toString()); // parse from text to int 
           recordTime = timeInSeconds * 1000; 
           recording = true; // change the boolen valut to true because we are recording now 
           Toast.makeText(getApplicationContext(), "Recording Started", Toast.LENGTH_SHORT).show(); 
           recorder.start(); // start recording 
           btnSave.setVisibility(View.VISIBLE); // enable the button 
           btnStart.setText("Stop"); // set the text to Stop 
           handler.sendEmptyMessageDelayed(REFRESH_VIDEOS, recordTime); 
          } 
         } 
        } 

        // hide the keyboard 
        view = getCurrentFocus(); 
        if (view != null) 
        { 
         imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); 
         imm.hideSoftInputFromWindow(view.getWindowToken(), 0); 
        } 
        // create a new intent for Service's object to record in background 
       } 
       catch (Exception e) 
       { 
        // hide the keyboard 
        view = getCurrentFocus(); 
        if(view != null) 
        { 
         imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE); 
         imm.hideSoftInputFromWindow(view.getWindowToken(),0); 
        } 
       } 
      } 
      else // if we are already recording 
      { 
       recording = false; // change the boolen valut to false because we are not recording now 
       btnSave.setVisibility(View.GONE); // enable the button 
       btnStart.setText("Start"); // set the text to Start 
       stopRecording(); // stop recording 
      } 
     } 
    }); 

    // button to save the video 
    btnSave = (Button) findViewById(R.id.btnSave); // get the Button object's id 
    btnSave.setVisibility(View.GONE); // disable the button 
    btnSave.setOnClickListener(new View.OnClickListener() 
    { 
     @Override 
     // saving the last 30 seconds 
     public void onClick(View v) 
     { 
      savingEvidence = true;// Stop the REFRESH_VIDEOS "thread" 
      handler.sendEmptyMessageDelayed(SAVE_EVIDENCE,recordTime); // Stop the current video after recordTime seconds 
      // SAVE_EVIDENCE(message) , recordTime(object) 
     } 
    }); 

} 

/// <Functions> 
// init the media recorder object 
private void initRecorder() 
{ 
    recorder.setAudioSource(MediaRecorder.AudioSource.DEFAULT); 
    //recorder.setVideoSource(MediaRecorder.VideoSource.DEFAULT); 
    recorder.setVideoSource(MediaRecorder.VideoSource.CAMERA); 

    cpHigh = CamcorderProfile.get(CamcorderProfile.QUALITY_HIGH); 


    recorder.setProfile(cpHigh); // Set the video output format and encoding 
    // create a string for saving the video 
    String videoName = savePath + "Record " + getCounter() + ".mp4"; 
    recorder.setOutputFile(videoName); 
    firstVideo = videoName; 
    setCounter(++counter); // count the number of the videos 

    //recorder.setMaxDuration(5000); // 5 seconds 
} 

// prepare the recorder before we are recording 
private void prepareRecorder() { 
    recorder.setPreviewDisplay(holder.getSurface()); // get the surface object 

    try 
    { 
     recorder.prepare(); // prepare the media recorder object , its very important to 
     // prepare the object before we are recording 
    } 
    catch (IllegalStateException e) 
    { 
     e.printStackTrace(); 
     finish(); 
    } 
    catch (IOException e) 
    { 
     e.printStackTrace(); 
     finish(); 
    } 
} 

// init the handler object 
public void initHandler() 
{ 
    handler = new Handler(new Handler.Callback() 
    { 
     @RequiresApi(api = Build.VERSION_CODES.N) 
     @Override 
     public boolean handleMessage(Message message) 
     { 
      switch (message.what) 
      { 
       case REFRESH_VIDEOS: 
        // Validations 
        if(savingEvidence || !recording) 
        { break; } 

        // Stop the first video 
        recorder.stop(); // stop recording 
        // Show a message for saving the video 
        Toast.makeText(getApplicationContext(), "Video saved! \n" + firstVideo, Toast.LENGTH_SHORT).show(); 


        // delete the second video 
        if(secondVideo != null) 
        { 
         File file = new File(secondVideo); 
         file.delete(); 
        } 

        // Change the name of the second video to first video 
        secondVideo = firstVideo; 

        // Start new video 
        initRecorder(); 
        prepareRecorder(); 
        recorder.start(); // start recording 

        // call handler for maximum 10 seconds and stop the video 
        handler.sendEmptyMessageDelayed(REFRESH_VIDEOS,recordTime); 
        break; 

       case SAVE_EVIDENCE: 
        // stop the first video 
        //stopRecording(); // stop recording 
        recorder.stop(); 
        // Show a message for saving the video's evidence 
        Toast.makeText(getApplicationContext(), "Evidence saved! " + "\n" +firstVideo , Toast.LENGTH_SHORT).show(); 

        // move firstvideo and secondvideo to private folder 
        Date dt = new Date(); // get the date 
        int hours = dt.getHours(); // get the hour now 
        int minutes = dt.getMinutes(); // get the minutes now 
        int seconds = dt.getSeconds(); // get the seconds now 
        // get the time 
        String curTime = hours + ":" + minutes + ":" + seconds; 
        // saving the videos with the time and the date 
        String firstPath = savePath + "Evidence - " + curTime+"/"; 
        String secondPath = savePath + "Evidence - " + curTime+"/"; 
        moveFile(firstVideo, firstPath, "1.mp4"); 
        moveFile(secondVideo, secondPath,"2.mp4"); 
        firstPath += "1.mp4"; 
        secondPath += "2.mp4"; 

        // resume REFRESH_VIDEOS 
        handler.sendEmptyMessageDelayed(REFRESH_VIDEOS,recordTime); 
        savingEvidence = false; 

        // creating intent object of SendingEmail class for sending a email 
        String[] TO = {((EditText)findViewById(R.id.etMail)).getText().toString()}; 
        Intent emailIntent = new Intent(Intent.ACTION_SEND); 
        emailIntent.setType("vnd.android.cursor.dir/email"); 
        emailIntent.putExtra(Intent.EXTRA_EMAIL,TO); 
        emailIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://"+firstPath)); 
        emailIntent.putExtra(Intent.EXTRA_SUBJECT,"Evidence"); 
        startActivity(Intent.createChooser(emailIntent,"Send Email...")); 

        // Start new video 
        initRecorder(); 
        prepareRecorder(); 
        recorder.start(); // start recording 
        break; 
      } 
      return false; 
     } 
    }); 
} 

// Stops the recording 
private void stopRecording() 
{ 
    // stop new video 
    Toast.makeText(getBaseContext(), "Recording Stopped", Toast.LENGTH_SHORT).show(); 
    recorder.stop(); 
    initRecorder(); 
    prepareRecorder(); 
} 

// when the surface just created in the first time 
public void surfaceCreated(SurfaceHolder holder) 
{ 
    prepareRecorder(); 
} 

// when we want to change a details of the surface object 
public void surfaceChanged(SurfaceHolder holder, int format, int width, 
          int height) 
{ 
} 

// when the surface object is gonna die 
public void surfaceDestroyed(SurfaceHolder holder) 
{ 
    if (recording) // if we are recording 
    { 
     recorder.stop(); // stop recording 
     recording = false; 
    } 
    recorder.release(); // release the media recorder object , its very important if we want to use again 
    finish(); 
} 

// move the files to new directory for saving the video's evidence 
private void moveFile(String videoPath, String outputPath, String videoName) 
{ 
    InputStream in = null; 
    OutputStream out = null; 
    try 
    { 
     File dir = new File (outputPath); 
     // if the directory isn't exist 
     if (!dir.exists()) 
     { 
      dir.mkdirs(); 
     } 

     in = new FileInputStream(videoPath); 
     out = new FileOutputStream(outputPath + videoName); 

     byte[] buffer = new byte[1024]; 
     int read; 
     while ((read = in.read(buffer)) != -1) 
     { 
      out.write(buffer, 0, read); 
     } 
     in.close(); 
     in = null; 

     // write the output file 
     out.flush(); 
     out.close(); 
     out = null; 

     // delete the second video 
     File file = new File(videoPath); 
     file.delete(); 

    } 

    catch (FileNotFoundException e1) 
    { 
     Log.e("tag", e1.getMessage()); 
    } 
    catch (Exception e) 
    { 
     Log.e("tag", e.getMessage()); 
    } 

} 
/// </Functions> 

}

Answer 1

如果你想添加的服务比你的包添加新类像这样，并通过服务延伸

现在在你的Mainefest.xml添加此并在活动中使用这项服务

添加计时器上测试服务类

public class TestService extends Service { 

    public final String TAG = TestService.this.getClass().getSimpleName(); 

    // constant 
    public static final long NOTIFY_INTERVAL = 10 * 1000; //Call every 10 sec 
    // run on another Thread to avoid crash 
    private Handler mHandler = new Handler(); 
    // timer handling 
    private Timer mTimer = null; 

    @Override 
    public IBinder onBind(Intent intent) { 
     return null; 
    } 

    @Override 
    public void onCreate() { 
     // cancel if already existed 
     if (mTimer != null) { 
      mTimer.cancel(); 
     } else { 
      // recreate new 
      mTimer = new Timer(); 
     } 
     // schedule task 
     mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 0, NOTIFY_INTERVAL); 
    } 

    class TimeDisplayTimerTask extends TimerTask { 

     @Override 
     public void run() { 
      // run on another thread 
      mHandler.post(new Runnable() { 

       @Override 
       public void run() { 
        //Here your Video Recording code which call every 10 sec 
       } 

      }); 
     } 
    } 

}