sdk 截屏之调用系统截屏

前天写了一篇截图(截屏)–未调用系统截屏管理,今天介绍一篇关于利用系统截屏的

其一:申请的权限如下:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

其二:关于TargetSdkVersion的版本 大小–最好选择在23以下(给用户去选择申请权限)

其三:其思想和上一篇文章是一样的 ,这里就不介绍了,直接贴代码
主体部分:

private ImageView mImageCupView;    private MediaProjectionManager mMediaProjectionManager;    private int mScreenWidth;    private int mScreenHeight;    private int mScreenDensity;    private ImageReader mImageReader;    private MediaProjection mMediaProjection;    private VirtualDisplay mVirtualDisplay;    public static final int REQUEST_MEDIA_PROJECTION = 18;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //获取当前屏幕的像素点        DisplayMetrics metrics = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(metrics);        mScreenDensity = metrics.densityDpi;        mScreenWidth = metrics.widthPixels;        mScreenHeight = metrics.heightPixels;        //5 表示接受的权限的最多次数(拒绝5次就会崩溃)        mImageReader = ImageReader.newInstance(mScreenWidth, mScreenHeight, PixelFormat.RGBA_8888, 5);        //检查其版本号        requestCapturePermission();        mImageCupView = (ImageView) findViewById(R.id.cupView);        findViewById(R.id.text).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if(mMediaProjection == null) {                    //判断是否获取到权限,否则开启重新开启权限                    Toast.makeText(MainActivity.this,"您必须接受开启权限",Toast.LENGTH_SHORT).show();                    requestCapturePermission();                }                startScreenShot();            }        });    }    private void startScreenShot() {        Handler handler1 = new Handler();        handler1.postDelayed(new Runnable() {            public void run() {                //start virtual                virtualDisplay();            }        }, 5);        handler1.postDelayed(new Runnable() {            public void run() {                //capture the screen                startCapture();            }        }, 30);    }    private void startCapture() {        Image image = mImageReader.acquireLatestImage();        if (image == null) {            //开始截屏            startScreenShot();        } else {            //保存截屏            SaveTask mSaveTask = new SaveTask();            AsyncTaskCompat.executeParallel(mSaveTask, image);        }    }    public class SaveTask extends AsyncTask<Image, Void, Bitmap> {        @Override        protected Bitmap doInBackground(Image... params) {            if (params == null || params.length < 1 || params[0] == null) {                return null;            }            Image image = params[0];            int width = image.getWidth();            int height = image.getHeight();            final Image.Plane[] planes = image.getPlanes();            final ByteBuffer buffer = planes[0].getBuffer();            //每个像素的间距            int pixelStride = planes[0].getPixelStride();            //总的间距            int rowStride = planes[0].getRowStride();            int rowPadding = rowStride - pixelStride * width;            Bitmap bitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);            bitmap.copyPixelsFromBuffer(buffer);            bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height);            image.close();            File fileImage = null;            if (bitmap != null) {                try {                    fileImage = new File(FileUtil.getScreenShotsName(getApplicationContext()));                    if (!fileImage.exists()) {                        fileImage.createNewFile();                    }                    FileOutputStream out = new FileOutputStream(fileImage);                    if (out != null) {                        bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);                        out.flush();                        out.close();                        //发送广播给相册--更新相册图片                        Intent media = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);                        Uri contentUri = Uri.fromFile(fileImage);                        media.setData(contentUri);                        sendBroadcast(media);                    }                } catch (FileNotFoundException e) {                    e.printStackTrace();                    fileImage = null;                } catch (IOException e) {                    e.printStackTrace();                    fileImage = null;                }            }            if (fileImage != null) {                return bitmap;            }            return null;        }        @Override        protected void onPostExecute(Bitmap bitmap) {            super.onPostExecute(bitmap);            //预览图片            if (bitmap != null) {                Toast.makeText(MainActivity.this,"截图已经成功保存到相册",Toast.LENGTH_SHORT).show();                //直接设置动画效果                setAnimation(bitmap);            }        }    }    private void setAnimation(Bitmap bitmap) {        int width = bitmap.getWidth();        int height = bitmap.getHeight();        ViewGroup.LayoutParams layoutParams = mImageCupView.getLayoutParams();        layoutParams.height = height;        layoutParams.width = width;        //mImagerCupView是布局文件中创建的        mImageCupView.setLayoutParams(layoutParams);        mImageCupView.setImageBitmap(bitmap);        AnimatorSet animatorSet = new AnimatorSet();        ObjectAnimator animatory = ObjectAnimator.ofFloat(mImageCupView, "scaleY", 1.0f, 0.0f);        ObjectAnimator animatorx = ObjectAnimator.ofFloat(mImageCupView, "scaleX", 1.0f, 0.0f);        animatorSet.addListener(new Animator.AnimatorListener() {            @Override            public void onAnimationStart(Animator animation) {            }            @Override            public void onAnimationEnd(Animator animation) {                //后面可以继续接着写其他活动，如页面的跳转等等            }            @Override            public void onAnimationCancel(Animator animation) {            }            @Override            public void onAnimationRepeat(Animator animation) {            }        });        animatorSet.setDuration(500);        animatorSet.play(animatory).with(animatorx);//两个动画同时开始        animatorSet.start();    }    private void virtualDisplay() {        if(mMediaProjection != null) {            mVirtualDisplay = mMediaProjection.createVirtualDisplay("screen-mirror",                    mScreenWidth, mScreenHeight, mScreenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,                    mImageReader.getSurface(), null, null);        }    }    @TargetApi(Build.VERSION_CODES.LOLLIPOP)    private void requestCapturePermission() {        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {            Toast.makeText(this, "不能截屏", Toast.LENGTH_LONG).show();            return;        }        //获取截屏的管理器        mMediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);        startActivityForResult(mMediaProjectionManager.createScreenCaptureIntent(), REQUEST_MEDIA_PROJECTION);    }    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {        super.onActivityResult(requestCode, resultCode, data);        switch (requestCode) {            case REQUEST_MEDIA_PROJECTION:                if (resultCode == RESULT_OK && data != null) {                    mMediaProjection = mMediaProjectionManager.getMediaProjection(Activity.RESULT_OK, data);                }                break;        }    }    private void tearDownMediaProjection() {        if (mMediaProjection != null) {            mMediaProjection.stop();            mMediaProjection = null;        }    }    private void stopVirtual() {        if (mVirtualDisplay == null) {            return;        }        mVirtualDisplay.release();        mVirtualDisplay = null;    }    // 结束后销毁    @Override    public void onDestroy() {        super.onDestroy();        stopVirtual();        tearDownMediaProjection();    }

工具类:如下

public class FileUtil {    //系统保存截图的路径    public static final String SCREENCAPTURE_PATH = "ScreenCapture" + File.separator + "Screenshots" + File.separator;    public static final String SCREENSHOT_NAME = "Screenshot";    public static String getAppPath(Context context) {        if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {            return Environment.getExternalStorageDirectory().toString();        } else {            return context.getFilesDir().toString();        }    }    public static String getScreenShots(Context context) {        StringBuffer stringBuffer = new StringBuffer(getAppPath(context));        stringBuffer.append(File.separator);        stringBuffer.append(SCREENCAPTURE_PATH);        File file = new File(stringBuffer.toString());        if (!file.exists()) {            file.mkdirs();        }        return stringBuffer.toString();    }    public static String getScreenShotsName(Context context) {        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd-hh-mm-ss");        String date = simpleDateFormat.format(new Date());        StringBuffer stringBuffer = new StringBuffer(getScreenShots(context));        stringBuffer.append(SCREENSHOT_NAME);        stringBuffer.append("_");        stringBuffer.append(date);        stringBuffer.append(".png");        return stringBuffer.toString();    }}

以上,就不做解释了