Android利用自带摄像头实现透明桌面壁纸

先看下效果，其实就是一个动态壁纸，通过摄像头把实时预览景象绘制到界面上，动态视频壁纸的实现原理与之类似

用到的权限

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.SET_WALLPAPER" />
    <uses-permission android:name="android.permission.SET_WALLPAPER_HINTS" />

    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />

    <uses-feature
        android:name="android.software.live_wallpaper"
        android:required="true" />

xml文件配置

<?xml version="1.0" encoding="utf-8"?>
<wallpaper
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:thumbnail="@mipmap/ic_launcher"/>

核心WallpaperService.java

public class WallpaperService extends android.service.wallpaper.WallpaperService {

    private static String TAG = "WallpaperService";
    private static final String SERVICE_NAME = "com.dq.wallpaper.service.WallpaperService";

    @Override
    public Engine onCreateEngine() {
        return new CameraEngine();
    }

    public static void startWallPaper(Context context) {
        Intent intent = new Intent(WallpaperManager.ACTION_CHANGE_LIVE_WALLPAPER);
        intent.putExtra(WallpaperManager.EXTRA_LIVE_WALLPAPER_COMPONENT, new ComponentName(context, WallpaperService.class));
        context.startActivity(intent);
    }

    class CameraEngine extends Engine implements Camera.PreviewCallback {
        private Camera camera;

        @Override
        public void onCreate(SurfaceHolder surfaceHolder) {
            super.onCreate(surfaceHolder);
            startPreview();
            setTouchEventsEnabled(true);
        }

        @Override
        public void onTouchEvent(MotionEvent event) {
            super.onTouchEvent(event);
            // 时间处理:点击拍照,长按拍照
        }

        @Override
        public void onDestroy() {
            super.onDestroy();
            stopPreview();
        }

        @Override
        public void onVisibilityChanged(boolean visible) {
            if (visible) {
                startPreview();
            } else {
                stopPreview();
            }
        }

        /**
         * 开始预览
         */
        public void startPreview() {
            Log.e("TAG", "开始预览");
            camera = Camera.open();
            camera.setDisplayOrientation(90);
            try {
                camera.setPreviewDisplay(getSurfaceHolder());
            } catch (IOException e) {
                e.printStackTrace();
            }
            camera.startPreview();
        }

        /**
         * 停止预览
         */
        public void stopPreview() {
            if (camera != null) {
                try {
                    camera.stopPreview();
                    camera.setPreviewCallback(null);
                    camera.release();
                } catch (Exception e) {
                    e.printStackTrace();
                }
                camera = null;
            }
        }

        @Override
        public void onPreviewFrame(byte[] bytes, Camera camera) {
            camera.addCallbackBuffer(bytes);
        }
    }
}

manifest.xml配置

<!-- 配置实时壁纸Service -->
        <service
            android:name=".WallpaperService"
            android:label="@string/app_name"
            android:permission="android.permission.BIND_WALLPAPER">
            <!-- 为实时壁纸配置intent-filter -->
            <intent-filter>
                <action android:name="android.service.wallpaper.WallpaperService" />
            </intent-filter>
            <!-- 为实时壁纸配置meta-data -->
            <meta-data
                android:name="android.service.wallpaper"
                android:resource="@xml/livewallpaper" />
        </service>

activity调用

WallpaperService.startWallPaper(this);

Demo源码下载