Android_Media：截屏

最新推荐文章于 2024-09-23 17:30:07 发布

火鸟菲戈

最新推荐文章于 2024-09-23 17:30:07 发布

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分类专栏： Android_Media

本文链接：https://blog.youkuaiyun.com/ss1168805219/article/details/70821365

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本文详细介绍了Android中MediaProjection及VirtualDisplay等类的使用方法，包括如何通过MediaProjectionManager获取服务、创建屏幕截图和录制、显示虚拟屏幕，并提供了完整的生命周期管理和示例代码。

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MediaProjection + VirtualDisplay

这里写图片描述

有关的类
- MediaProjectionManager
- MediaProjection
- VirtualDisplay
- SurfaceView
- Sruface

MediaProjectionManager是个系统级服务，同TelephoneManager一样，通过getSystemService()方法获取；
MediaProjection 实现截屏和录屏的类
VirtualDisplay显示截屏

用SurfaceView来显示，

获取Surface

SurfaceView surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
Surface surface = surfaceView.getHolder().getSurface();

获取DPI

DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
int ensityDpi = metrics.densityDpi;

获取MediaProjectionManager

MediaProjectionManager mediaManager = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE);

分“开始”+“结束”选项
开始的代码见下方，if else判断逻辑还没搞懂，先放着吧

if (surface == null) {
    LogUtil.d(TAG, "surface == null");
    return;
}
if (mediaProjection != null) {
    createVirtualDisplay();
} else if (mResultCode != 0 && mResultData != null) {
    getMediaProjection();
    createVirtualDisplay();
} else {
    startActivityForResult(mediaManager.createScreenCaptureIntent(), 1);//createScreenCaptureIntent() API>=21
}

createVirtualDisplay()

VirtualDisplay mVirtualDisplay = mediaProjection.createVirtualDisplay("VirtualDisplay01", surfaceView.getWidth(),
        surfaceView.getHeight(), densityDpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, surface, null, null);

getMediaProjection()

MediaProjection mediaProjection = mediaManager.getMediaProjection(mResultCode, mResultData);

关闭 stopScreenCapture();

关闭的是VirtualDisplay

if (mVirtualDisplay != null) {
    mVirtualDisplay.release();//API>=19
    mVirtualDisplay = null;
}

onActivityResult()

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 1) {
        if (resultCode != RESULT_OK) {
            LogUtil.d(TAG, "用户点击了取消");
            return;
        }
        mResultCode = resultCode;
        mResultData = data;

        getMediaProjection();
        createVirtualDisplay();
    }
}

销毁

@Override
protected void onPause() {
    super.onPause();
    if (mVirtualDisplay != null) {
       mVirtualDisplay.release();//API>=19
       mVirtualDisplay = null;
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();
    if (mediaProjection != null) {
        mediaProjection.stop();
        mediaProjection = null;
    }
}