{"id":29193,"date":"2024-05-08T09:36:24","date_gmt":"2024-05-08T01:36:24","guid":{"rendered":"https:\/\/h5app.yimenapp.cn\/h5app\/?p=29193"},"modified":"2024-05-08T09:36:24","modified_gmt":"2024-05-08T01:36:24","slug":"app%e5%bc%80%e5%8f%91%e4%b8%ad%e5%a6%82%e4%bd%95%e8%b0%83%e5%8a%a8%e7%9b%b8%e6%9c%ba%e6%8b%8d%e7%85%a7","status":"publish","type":"post","link":"https:\/\/h5app.yimenapp.cn\/h5app\/2024\/appkfa\/29193\/","title":{"rendered":"app\u5f00\u53d1\u4e2d\u5982\u4f55\u8c03\u52a8\u76f8\u673a\u62cd\u7167?"},"content":{"rendered":"

\u5728\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\u4e2d\uff0c\u8c03\u7528\u76f8\u673a\u8fdb\u884c\u62cd\u7167\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u9700\u6c42\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5728app\u5f00\u53d1\u4e2d\u8c03\u7528\u76f8\u673a\u62cd\u7167\u7684\u539f\u7406\u548c\u6b65\u9aa4\u3002<\/p>\n

\u5728Android\u5f00\u53d1\u4e2d\uff0c\u4f7f\u7528\u76f8\u673a\u8fdb\u884c\u62cd\u7167\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528Camera\u7c7b\u6765\u5b9e\u73b0\u3002\u9996\u5148\uff0c\u9700\u8981\u5728AndroidManifest.xml\u6587\u4ef6\u4e2d\u6dfb\u52a0\u76f8\u673a\u6743\u9650\uff1a<\/p>\n

“`<\/p>\n<\/p>\n

“`<\/p>\n

\u63a5\u4e0b\u6765\uff0c\u5728\u5e03\u5c40\u6587\u4ef6\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u7528\u4e8e\u663e\u793a\u76f8\u673a\u9884\u89c8\u7684SurfaceView\u7ec4\u4ef6\uff1a<\/p>\n

“`<\/p>\n<\/p>\n

android:id=”@+id\/sAPP<\/a>urfaceView”<\/p>\n

android:layout_width=”match_parent”<\/p>\n

android:layout_height=”match_parent” \/><\/p>\n

“`<\/p>\n

\u7136\u540e\uff0c\u5728Activity\u4e2d\u83b7\u53d6SurfaceView\u7ec4\u4ef6\uff0c\u5e76\u5728\u5408\u9002\u7684\u65f6\u673a\u521d\u59cb\u5316\u76f8\u673a\uff1a<\/p>\n

“`java<\/p>\n

private SurfaceView mSurfaceView;<\/p>\n

private Camera mCamera;<\/p>\n

@Override<\/p>\n

protected void onCreate(Bundle savAPP\u5f00\u53d1<\/a>edInstanceState) {<\/p>\n

super.onCreate(savedInstanceState);<\/p>\n

setContentView(R.layout.activity_main);<\/p>\n

mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView);<\/p>\n

mSurfaceView.getHolder().addCallback(mSurfaceHolderCallback);<\/p>\n

}<\/p>\n

private SurfaceHolder.Callback mSurfaceHolderCallback = new SurfaceHolder.Callback() {<\/p>\n

@Override<\/p>\n

public void surfaceCreated(SurfaceHolder holder) {<\/p>\n

\/\/ \u521d\u59cb\u5316\u76f8\u673a<\/p>\n

mCamera = Camera.open();<\/p>\n

try {<\/p>\n

mCamera.setPreviewDisplay(holder);<\/p>\n

} catch (IOException e) {<\/p>\n

e.printStackTrace();<\/p>\n

}<\/p>\n

}<\/p>\n

@Override<\/p>\n

public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {<\/p>\n

\/\/ \u8c03\u6574\u76f8\u673a\u9884\u89c8\u5927\u5c0f<\/p>\n

Camera.Parameters parameters = mCamera.getParameters();<\/p>\n

List supportedSizes = parameters.getSupportedPreviewSizes();<\/p>\n

Camera.Size optimalSize = getOptimalPreviewSize(supportedSizes, width, height);<\/p>\n

parameters.setPreviewSize(optimalSize.width, optimalSize.height);<\/p>\n

mCamera.setParameters(parameters);<\/p>\n

\/\/ \u5f00\u59cb\u76f8\u673a\u9884\u89c8<\/p>\n

mCamera.startPreview();<\/p>\n

}<\/p>\n

@Override<\/p>\n

public void surfaceDestroyed(SurfaceHolder holder) {<\/p>\n

\/\/ \u91ca\u653e\u76f8\u673a\u8d44\u6e90<\/p>\n

mCamera.stopPreview();<\/p>\n

mCamera.release();<\/p>\n

mCamera = null;<\/p>\n

}<\/p>\n

};<\/p>\n

private Camera.Size getOptimalPreviewSize(List sizes, int width, int height) {<\/p>\n

final double ASPECT_TOLERANCE = 0.1;<\/p>\n

double targetRatio = (double) width \/ height;<\/p>\n

Camera.Size optimalSize = null;<\/p>\n

double minDiff = Double.MAX_VALUE;<\/p>\n

for (Camera.Size size : sizes) {<\/p>\n

double ratio = (double) size.width \/ size.height;<\/p>\n

if (Math.abs(ratio – targetRatio) > ASPECT_TOLERANCE) continue;<\/p>\n

if (Math.abs(size.height – height) <\/p>\n

optimalSize = size;<\/p>\n

minDiff = Math.abs(size.height – height);<\/p>\n

}<\/p>\n

}<\/p>\n

if (optimalSize == null) {<\/p>\n

\n

<\/figure>\n<\/p>\n

minDiff = Double.MAX_VALUE;<\/p>\n

for (Camera.Size size : sizes) {<\/p>\n

if (Math.abs(size.height – height) <\/p>\n

optimalSize = size;<\/p>\n

minDiff = Math.abs(size.height – height);<\/p>\n

}<\/p>\n

}<\/p>\n

}<\/p>\n

return optimalSize;<\/p>\n

}<\/p>\n

“`<\/p>\n

\u4ee5\u4e0a\u4ee3\u7801\u4e2d\uff0cmSurfaceHolderCallback\u662fSurfaceHolder.Callback\u7684\u4e00\u4e2a\u5b9e\u73b0\uff0c\u7528\u4e8e\u76d1\u542cSurfaceView\u7684\u72b6\u6001\u53d8\u5316\u3002\u5728surfaceCreated\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u6253\u5f00\u76f8\u673a\u5e76\u5c06\u9884\u89c8\u663e\u793a\u5728SurfaceView\u4e0a\uff1b\u5728surfaceChanged\u65b9\u6cd5\u4e2d\uff0c\u8c03\u6574\u76f8\u673a\u9884\u89c8\u7684\u5927\u5c0f\uff0c\u5e76\u5f00\u59cb\u76f8\u673a\u9884\u89c8\uff1b\u5728surfaceDestroyed\u65b9\u6cd5\u4e2d\uff0c\u91ca\u653e\u76f8\u673a\u8d44\u6e90\u3002<\/p>\n

\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u53ef\u4ee5\u6dfb\u52a0\u4e00\u4e2a\u6309\u94ae\uff0c\u7528\u4e8e\u89e6\u53d1\u62cd\u7167\u4e8b\u4ef6\uff1a<\/p>\n

“`java<\/p>\n

Button mCaptureButton = (Button) findViewById(R.id.captureButton);<\/p>\n

mCaptureButton.setOnClickListener(new View.OnClickListener() {<\/p>\n

@Override<\/p>\n

public void onClick(View v) {<\/p>\n

mCamera.takePicture(null, null, mPictureCallback);<\/p>\n

}<\/p>\n

});<\/p>\n

“`<\/p>\n

\u5728mCaptureButton\u7684\u70b9\u51fb\u4e8b\u4ef6\u4e2d\uff0c\u8c03\u7528mCamera.takePicture\u65b9\u6cd5\u8fdb\u884c\u62cd\u7167\u3002mPictureCallback\u662fCamera.PictureCallback\u7684\u4e00\u4e2a\u5b9e\u73b0\uff0c\u7528\u4e8e\u5904\u7406\u62cd\u7167\u7ed3\u679c\uff1a<\/p>\n

“`java<\/p>\n

private Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {<\/p>\n

@Override<\/p>\n

public void onPictureTaken(byte[] data, Camera camera) {<\/p>\n

\/\/ \u5904\u7406\u62cd\u7167\u7ed3\u679c<\/p>\n

Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);<\/p>\n

\/\/ \u4fdd\u5b58\u56fe\u7247\u5230\u672c\u5730<\/p>\n

String filePath = Environment.getExternalStorageDirectory().getPath() + “\/image.jpg”;<\/p>\n

try {<\/p>\n

FileOutputStream fos = new FileOutputStream(filePath);<\/p>\n

bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);<\/p>\n

fos.close();<\/p>\n

} catch (IOException e) {<\/p>\n

e.printStackTrace();<\/p>\n

}<\/p>\n

\/\/ \u91cd\u65b0\u5f00\u59cb\u76f8\u673a\u9884\u89c8<\/p>\n

mCamera.startPreview();<\/p>\n

}<\/p>\n

};<\/p>\n

“`<\/p>\n

\u5728mPictureCallback\u7684onPictureTaken\u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u62cd\u7167\u7ed3\u679c\u8f6c\u6362\u4e3aBitmap\u5bf9\u8c61\uff0c\u5e76\u4fdd\u5b58\u5230\u672c\u5730\u3002\u6700\u540e\uff0c\u91cd\u65b0\u5f00\u59cb\u76f8\u673a\u9884\u89c8\u3002<\/p>\n

\u81f3\u6b64\uff0c\u6211\u4eec\u5df2\u7ecf\u5b8c\u6210\u4e86\u5728app\u5f00\u53d1\u4e2d\u8c03\u7528\u76f8\u673a\u62cd\u7167\u7684\u6b65\u9aa4\u3002\u901a\u8fc7\u4e0a\u8ff0\u4ee3\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u76f8\u673a\u5e94\u7528\uff0c\u7528\u6237\u70b9\u51fb\u6309\u94ae\u5373\u53ef\u62cd\u7167\u5e76\u4fdd\u5b58\u5230\u672c\u5730\u3002\u5f53\u7136\uff0c\u4e3a\u4e86\u66f4\u597d\u7684\u7528\u6237\u4f53\u9a8c\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u6dfb\u52a0\u76f8\u673a\u9884\u89c8\u7684\u81ea\u5b9a\u4e49\u754c\u9762\u3001\u62cd\u7167\u53c2\u6570\u7684\u8bbe\u7f6e\u7b49\u529f\u80fd\uff0c\u8fd9\u9700\u8981\u6839\u636e\u5177\u4f53\u9700\u6c42\u8fdb\u884c\u6269\u5c55\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u60a8\u7406\u89e3\u76f8\u673a\u62cd\u7167\u7684\u539f\u7406\u548c\u6b65\u9aa4\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728\u5e94\u7528\u7a0b\u5e8f\u5f00\u53d1\u4e2d\uff0c\u8c03\u7528\u76f8\u673a\u8fdb\u884c\u62cd\u7167\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u9700\u6c42\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5728app\u5f00\u53d1\u4e2d\u8c03\u7528\u76f8\u673a\u62cd\u7167\u7684\u539f\u7406\u548c\u6b65\u9aa4\u3002\u5728Android\u5f00\u53d1\u4e2d\uff0c\u4f7f\u7528\u76f8\u673a\u8fdb\u884c\u62cd\u7167\u53ef\u4ee5\u901a\u8fc7\u8c03\u7528Camera\u7c7b\u6765\u5b9e\u73b0\u3002\u9996\u5148\uff0c\u9700\u8981\u5728A<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[7781,10184,427,416,4723],"topic":[],"class_list":["post-29193","post","type-post","status-publish","format-standard","hentry","category-appkfa","tag-windows","tag-app","tag-427","tag-416","tag-4723"],"_links":{"self":[{"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/posts\/29193","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/comments?post=29193"}],"version-history":[{"count":1,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/posts\/29193\/revisions"}],"predecessor-version":[{"id":29200,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/posts\/29193\/revisions\/29200"}],"wp:attachment":[{"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/media?parent=29193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/categories?post=29193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/tags?post=29193"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/h5app.yimenapp.cn\/h5app\/wp-json\/wp\/v2\/topic?post=29193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}