android摄像头调用,android调用摄像头读取数据

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android 中实现网页调用摄像头功能？怎么实现？

android 中实现网页调用摄像头功能方法·如下：

1. 首先在Manifest.xml中添加如下权限：

!-- 访问网络权限 --

uses-permission android:name="android.permission.INTERNET"/

!-- 调用摄像头的权限 --

uses-permission android:name="android.permission.CAMERA"/

!-- 文件系统权限 --

uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/

!-- SD卡写权限 --

uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/

2. 编写index.html放在android项目下的assests目录下：

index.html:

html

head

titleWebview capture testing.../title

script type="text/javascript"

//android中调用js方法

function wave() {

alert('cc2');

document.getElementById("droid").innerHTML ="android_waving.png";

}

//android中调用js方法2，并更id为"droid"的span标签的值及新刚拍的照片显示到"pic0"里

function wave2(name) {

alert(name);

document.getElementById("droid").innerHTML = "Photopath: " + name;

document.getElementById("pic0").src=name;

}

//html的点击事件，并通过"window.demo.clickOnAndroid"触发android中的clickOnAndroid方法

function clickOnHtml () {

var fileName = window.demo.clickOnAndroid();

//wave2(fileName);

}

function revert() {

alert('cc');

document.getElementById("droid").innerHTML ="aa2";

}

/script

style type="text/css"

body{

font:14px;

color:#333;

line-height: 1.8em;

margin: 0;

padding: 0;

width:480px;

}

html{

outline: none;

hide-focus:expression(this.hideFocus=true);

}

/style

/head

body

div

pHere is the funtion to TakePhoto in html/p

!-- 通过"window.demo.clickOnAndroid"触发android中的clickOnAndroid方法 --

a onClick="window.demo.clickOnAndroid()"TakePhoto/abr/

span id='droid'Photopath:/span

br/

pHere is the funtion to revert in html/p

input type="button" onclick="revert();" value="Revert" / br/

input type="button" onclick="javascript:window.top.location.reload()" value="Refresh" /

/li

/div

div

p id="picpath"PhotoPath/p

img alt="ddd" id="pic0" width="200" height="200" src="/storage/sdcard0/webview_camera/testimg23.8156950140954181.jpg" /

/div

/body

/html

3、编写Activity的布局activity_camera_webview.xml：

RelativeLayout xmlns:android=""

xmlns:tools=""

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context=".CameraWebviewActivity"

Button

android:id="@+id/bt"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Camera"

android:layout_alignParentTop="true"

WebView

android:id="@+id/wv"

android:layout_width="fill_parent"

android:layout_height="match_parent"

android:layout_below="@+id/bt"

/RelativeLayout

4.、编写activity：

public class CameraWebviewActivity extends Activity {

private final static String TAG = "CameraWebviewActivity";

private Button bt;

private WebView wv;

public String fileFullName;//照相后的照片的全整路径

private boolean fromTakePhoto; //是否是从摄像界面返回的webview

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_camera_webview);

initViews();

}

private void initViews() {

bt = (Button) findViewById(R.id.bt);

bt.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

System.out.println("----------------");

takePhoto( Math.random()*1000+1 + ".jpg");

}

});

wv = (WebView) findViewById(R.id.wv);

WebSettings setting = wv.getSettings();

setting.setJavaScriptEnabled(true);

wv.setWebViewClient(new WebViewClient(){

@Override

public void onPageStarted(WebView view, String url, Bitmap favicon) {

super.onPageStarted(view, url, favicon);

}

@Override

public boolean shouldOverrideUrlLoading(WebView view, String url) {

return super.shouldOverrideUrlLoading(view, url);

}

@Override

public void onPageFinished(WebView view, String url) {

super.onPageFinished(view, url);

}

});

wv.setWebChromeClient(new WebChromeClient(){

@Override//实现js中的alert弹窗在Activity中显示

public boolean onJsAlert(WebView view, String url, String message, JsResult result) {

Log.d(TAG, message);

result.confirm();

return true;

}

});

wv.loadUrl("");

final Handler mHandler = new Handler();

//webview增加javascript接口，监听html页面中的js点击事件

wv.addJavascriptInterface(new Object(){

public String clickOnAndroid() {//将被js调用

mHandler.post(new Runnable() {

public void run() {

fromTakePhoto = true;

//调用启用摄像头的自定义方法

takePhoto("testimg" + Math.random()*1000+1 + ".jpg");

System.out.println("========fileFullName: " + fileFullName);

}

});

return fileFullName;

}

}, "demo");

}

* 调用摄像头的方法

public void takePhoto(String filename) {

System.out.println("----start to take photo2 ----");

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

intent.putExtra(MediaStore.EXTRA_MEDIA_TITLE, "TakePhoto");

//判断是否有SD卡

String sdDir = null;

boolean isSDcardExist = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);

if(isSDcardExist) {

sdDir = Environment.getExternalStorageDirectory().getAbsolutePath();

} else {

sdDir = Environment.getRootDirectory().getAbsolutePath();

}

//确定相片保存路径

String targetDir = sdDir + "/" + "webview_camera";

File file = new File(targetDir);

if (!file.exists()) {

file.mkdirs();

}

fileFullName = targetDir + "/" + filename;

System.out.println("----taking photo fileFullName: " + fileFullName);

//初始化并调用摄像头

intent.putExtra(MediaStore.Images.Media.MIME_TYPE, "image/jpeg");

intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(fileFullName)));

startActivityForResult(intent, 1);

}

* (non-Javadoc)

* @see android.app.Activity#onActivityResult(int, int, android.content.Intent)

* 重写些方法，判断是否从摄像Activity返回的webview activity

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

System.out.println("----requestCode: " + requestCode + "; resultCode " + resultCode + "; fileFullName: " + fileFullName);

if (fromTakePhoto requestCode ==1 resultCode ==-1) {

wv.loadUrl("javascript:wave2('" + fileFullName + "')");

} else {

wv.loadUrl("javascript:wave2('Please take your photo')");

}

fromTakePhoto = false;

super.onActivityResult(requestCode, resultCode, data);

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.camera_webview, menu);

return true;

}

相关问答

Q1: 如何直接调用安卓Android的系统相机的前置摄像头

1、在手机的设置里面去找相机的设置，

在照相的功能下也可以在选项里面找到更换摄像头的选项，

一般都是按左键出来选单的。

2、在手机菜单里面勾选摄像头选项，切换到你想要的摄像头，然后把那个屏幕切换一下，竖屏或横屏；

3、你若是在找不到就到手机铺里面找售后维修或者在照片拍摄好后，在电脑上面把使用那个图像管理器把图片，点击那个转换头，让图片正过来。

Q2: android 中实现网页调用摄像头功能？怎么实现

android 中实现网页调用摄像头功能方法·如下： 1/apk/res/android" xmlns:tools="schemas/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".CameraWebviewActivity" Button android:id="@+id/bt" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Camera" android:layout_alignParentTop="true" /WebView android:id="@+id/wv" android:layout_width="fill_parent" android:layout_height="match_parent" android:layout_below="@+id/bt" //RelativeLayout 4.、编写activity： public class CameraWebviewActivity extends Activity {private final static String TAG = "CameraWebviewActivity";private Button bt; private WebView wv; public String fileFullName;//照相后的照片的全整路径 private boolean fromTakePhoto; //是否是从摄像界面返回的webview@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_camera_webview); initViews(); }private void initViews() {bt = (Button) findViewById(R.id.bt); bt.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { System.out.println("----------------"); takePhoto( Math.random()*1000+1 + ".jpg"); } });wv = (WebView) findViewById(R.id.wv); WebSettings setting = wv.getSettings(); setting.setJavaScriptEnabled(true); wv.setWebViewClient(new WebViewClient(){ @Override public void onPageStarted(WebView view, String url, Bitmap favicon) { super.onPageStarted(view, url, favicon); }@Override public boolean shouldOverrideUrlLoading(WebView view, String url) { return super.shouldOverrideUrlLoading(view, url); }@Override public void onPageFinished(WebView view, String url) { super.onPageFinished(view, url); }});wv.setWebChromeClient(new WebChromeClient(){ @Override//实现js中的alert弹窗在Activity中显示 public boolean onJsAlert(WebView view, String url, String message, JsResult result) { Log.d(TAG, message); result.confirm(); return true; } });wv.loadUrl(""); final Handler mHandler = new Handler(); //webview增加javascript接口，监听html页面中的js点击事件 wv.addJavascriptInterface(new Object(){ public String clickOnAndroid() {//将被js调用 mHandler.post(new Runnable() { public void run() { fromTakePhoto = true; //调用启用摄像头的自定义方法 takePhoto("testimg" + Math.random()*1000+1 + ".jpg"); System.out.println("========fileFullName: " + fileFullName);} }); return fileFullName; } }, "demo"); }/* * 调用摄像头的方法 */ public void takePhoto(String filename) { System.out.println("----start to take photo2 ----"); Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); intent.putExtra(MediaStore.EXTRA_MEDIA_TITLE, "TakePhoto");//判断是否有SD卡 String sdDir = null; boolean isSDcardExist = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED); if(isSDcardExist) { sdDir = Environment.getExternalStorageDirectory().getAbsolutePath(); } else { sdDir = Environment.getRootDirectory().getAbsolutePath(); } //确定相片保存路径 String targetDir = sdDir + "/" + "webview_camera"; File file = new File(targetDir); if (!file.exists()) { file.mkdirs(); } fileFullName = targetDir + "/" + filename; System.out.println("----taking photo fileFullName: " + fileFullName); //初始化并调用摄像头 intent.putExtra(MediaStore.Images.Media.MIME_TYPE, "image/jpeg"); intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new File(fileFullName))); startActivityForResult(intent, 1); }/* * (non-Javadoc) * @see android.app.Activity#onActivityResult(int, int, android.content.Intent) * 重写些方法，判断是否从摄像Activity返回的webview activity */ @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { System.out.println("----requestCode: " + requestCode + "; resultCode " + resultCode + "; fileFullName: " + fileFullName); if (fromTakePhoto requestCode ==1 resultCode ==-1) { wv.loadUrl("javascript:wave2('" + fileFullName + "')"); } else { wv.loadUrl("javascript:wave2('Please take your photo')"); } fromTakePhoto = false; super.onActivityResult(requestCode, resultCode, data); }@Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.camera_webview, menu); return true; }}

Q3: android怎么调用手机摄像头

这个权限的话通常都是软件会自动获取的，像有些软件需要获取手机的摄像头调用权限，通常都会默认配置的。

如果自己禁止了某些软件调用摄像头，这种情况的话，只需要在手机设置的权限管理里面自己设置一下离学校有摄像头就可以了。

Q4: Android调用本机摄像头后可以移动

Android调用本机摄像头后可以移动如下

调用本机摄像头//设置返回码：标志照相机拍摄final int RESULT_CAMERA=100;//设置一个临时路径，保存所拍的照片String savefont = “/storage/sdcard0/”;// 获取模板路径File CameraFolder = new File(savefont, “CameraFile”);if (!CameraFolder.exists())//判断文件夹是否存在，不存在则创建文件夹，已经存在跳过{undefinedCameraFolder.mkdir()。