Question

我正在制作一个播放背景音乐的应用程序。当手机的屏幕关闭（或进入睡眠状态）时，音乐就会停止播放，我希望屏幕关闭后也能播放音乐。

这是我的代码。

import cv2
import numpy as np

mg = cv2.imread('octa.jpg')
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)

kernel_size = 5
blur_gray = cv2.GaussianBlur(gray,(kernel_size, kernel_size),0)
ret,thresh = cv2.threshold(blur_gray,100,255,0)

low_threshold = 50
high_threshold = 150
edges = cv2.Canny(thresh, low_threshold, high_threshold)

rho = 1  # distance resolution in pixels of the Hough grid
theta = np.pi / 180  # angular resolution in radians of the Hough grid
threshold = 15  # minimum number of votes (intersections in Hough grid cell)
min_line_length = 50  # minimum number of pixels making up a line
max_line_gap = 50  # maximum gap in pixels between connectable line segments
line_image = np.copy(img) * 0  # creating a blank to draw lines on

# Run Hough on edge detected image
# Output "lines" is an array containing endpoints of detected line segments
lines = cv2.HoughLinesP(edges, rho, theta, threshold, np.array([]),
                    min_line_length, max_line_gap)

for line in lines:
    for x1,y1,x2,y2 in line:
        cv2.line(line_image,(x1,y1),(x2,y2),(255,0,0),2)

lines_edges = cv2.addWeighted(img, 0.5, line_image, 1, 0)

line_image_gray = cv2.cvtColor(line_image, cv2.COLOR_RGB2GRAY)

M = cv2.moments(line_image_gray)

cx = int(M['m10']/M['m00'])
cy = int(M['m01']/M['m00'])

cv2.circle(lines_edges, (cx, cy), 5, (0, 0, 255), 1)

cv2.imshow("res", lines_edges)

Answer 1

MediaPlayer类可用于控制音频/视频文件和流的播放。在VideoView中可以找到有关如何使用此类中的方法的示例。 MediaPlayer

public class SoundService extends Service {
    private static final String TAG = null;
    MediaPlayer player;
    public IBinder onBind(Intent arg0) {

        return null;
    }
    @Override
    public void onCreate() {
        super.onCreate();
        player = MediaPlayer.create(this, R.raw.idil);
        player.setLooping(true); // Set looping
        player.setVolume(100,100);

    }
    public int onStartCommand(Intent intent, int flags, int startId) {
        player.start();
        return 1;
    }

    public void onStart(Intent intent, int startId) {
        // TO DO
    }
    public IBinder onUnBind(Intent arg0) {
        // TO DO Auto-generated method
        return null;
    }

    public void onStop() {

    }
    public void onPause() {

    }
    @Override
    public void onDestroy() {
        player.stop();
        player.release();
    }

    @Override
    public void onLowMemory() {

    }
}

  Intent svc=new Intent(this, SoundService.class);
  startService(svc);

确保您已将服务添加到清单中。

<service android:enabled="true" android:name=".SoundService" />

Answer 2

您应该考虑使用Service。

如何防止手机屏幕关闭后音乐停止播放？

2 个答案: