肖潇晓枭逍 2020-08-27 16:06 采纳率: 100%
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android studio开发为什么一调用安卓摄像头app就自动退出，求大神指导

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.FileProvider;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ClipData;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.os.StrictMode;
import android.os.SystemClock;
import android.provider.MediaStore;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import java.io.File;
import java.util.logging.Logger;

import util.PhotoUtils;
public class MainActivity extends AppCompatActivity {

private WebView webView;
private boolean videoFlag = false;
private final static String TAG = "villa";
private ValueCallback<Uri> mUploadMessage;
private ValueCallback<Uri[]> mUploadCallbackAboveL;
private final static int PHOTO_REQUEST = 100;
private final static int VIDEO_REQUEST = 120;
private String mAcceptType;
private  Uri imageUri;
private final int OPEN_RESULT = 1; // 打开相机
private final int PICK_RESULT = 2; // 查看相册
private final int OPEN_RESULT2 = 3; // 打开相机2


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //实例化WebView对象
    webView = new WebView(this);
    //设置WebView属性，能够执行Javascript脚本
    webView.getSettings().setJavaScriptEnabled(true);
    StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
    StrictMode.setVmPolicy(builder.build());
    builder.detectFileUriExposure();
    initWebView();
    //加载需要显示的网页
    //webview.loadUrl("file:///android_asset/index.html");//显示本地网页
    webView.loadUrl("http://1j4572h972.iok.la:27446/bdcWX/pages/apphtml/csxhtml/index.html");//显示远程网页
    //设置Web视图
    setContentView(webView);
}
/**
 * 初始化WebView
 */
private void initWebView() {
    //不跳转到其他浏览器
    webView.setWebViewClient(new WebViewClient() {
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return true;
        }

        @Override
        public void onReceivedHttpError(WebView view, WebResourceRequest request, WebResourceResponse errorResponse) {
            super.onReceivedHttpError(view, request, errorResponse);
            int statusCode = errorResponse.getStatusCode();
            if (404 == statusCode || 500 == statusCode) {
                // view.loadUrl("about:blank");// 避免出现默认的错误界面
                view.loadUrl("http://1j4572h972.iok.la:27446/bdcWX/pages/apphtml/csxhtml/index.html");// 重新加载网页（如果失败的话）
            }
        }
    });
    WebSettings settings = webView.getSettings();
    settings.setUseWideViewPort(true);
    settings.setLoadWithOverviewMode(true);
    settings.setDomStorageEnabled(true);
    settings.setDefaultTextEncodingName("UTF-8");
    settings.setAllowContentAccess(true); // 是否可访问Content Provider的资源，默认值 true
    settings.setAllowFileAccess(true);    // 是否可访问本地文件，默认值 true
    // 是否允许通过file url加载的Javascript读取本地文件，默认值 false
    settings.setAllowFileAccessFromFileURLs(false);
    // 是否允许通过file url加载的Javascript读取全部资源(包括文件,http,https)，默认值 false
    settings.setAllowUniversalAccessFromFileURLs(false);
    //开启JavaScript支持
    settings.setJavaScriptEnabled(true);
    // 支持缩放
    settings.setSupportZoom(true);
    //辅助WebView设置处理关于页面跳转，页面请求等操作
    webView.setWebViewClient(new MyWebViewClient());
    //辅助WebView处理图片上传操作
    webView.setWebChromeClient(new MyChromeWebClient());
    //加载地址

/* final JavaScriptInterface myJavaScriptInterface
= new JavaScriptInterface(this);*/

    webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
    webView.getSettings().setLightTouchEnabled(true);
    webView.getSettings().setJavaScriptEnabled(true);
    webView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(
                    android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            // 打开照相机,设置请求码
            startActivityForResult(intent, OPEN_RESULT2);
        }
    });

    WebView.setWebContentsDebuggingEnabled(true);
    webView.addJavascriptInterface(new JavascriptInterface[]{}, "AndroidFunction");
    webView.getSettings().setDefaultTextEncodingName("utf-8");
    webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);

    webView.loadUrl("http://1j4572h972.iok.la:27446/bdcWX/pages/apphtml/csxhtml/index.html");
}
//自定义 WebViewClient 辅助WebView设置处理关于页面跳转，页面请求等操作【处理tel协议和视频通讯请求url的拦截转发】
private class MyWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        Logger.getLogger(url);
        if (!TextUtils.isEmpty(url)) {
            videoFlag = url.contains("vedio");
        }
        if (url.trim().startsWith("tel")) {//特殊情况tel，调用系统的拨号软件拨号【<a href="tel:1111111111">1111111111</a>】
            Intent i = new Intent(Intent.ACTION_VIEW);
            i.setData(Uri.parse(url));
            startActivity(i);
        } else {
            String port = url.substring(url.lastIndexOf(":") + 1, url.lastIndexOf("/"));//尝试要拦截的视频通讯url格式(808端口)：【http://xxxx:808/?roomName】
            if (port.equals("808")) {//特殊情况【若打开的链接是视频通讯地址格式则调用系统浏览器打开】
                Intent i = new Intent(Intent.ACTION_VIEW);
                i.setData(Uri.parse(url));
                startActivity(i);
            } else {//其它非特殊情况全部放行
                view.loadUrl(url);
            }
        }
        return true;
    }
}
private class MyChromeWebClient extends WebChromeClient{

    public void openFileChooser(ValueCallback<Uri> uploadMsg) {
        Log.d(TAG, "openFileChoose(ValueCallback<Uri> uploadMsg)");
        mUploadMessage = uploadMsg;
        if (videoFlag) {
            recordVideo();
        } else {
            takePhoto();
        }

    }

    // For Android 3.0+
    public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
        Log.d(TAG, "openFileChoose( ValueCallback uploadMsg, String acceptType )");
        mUploadMessage = uploadMsg;
        if (videoFlag) {
            recordVideo();
        } else {
            takePhoto();
        }
    }

    //For Android 4.1
    public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
        Log.d(TAG, "openFileChoose(ValueCallback<Uri> uploadMsg, String acceptType, String capture)");
        mUploadMessage = uploadMsg;
        if (videoFlag) {
            recordVideo();
        } else {
            takePhoto();
        }
    }

    // For Android 5.0+
    public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
        Log.d(TAG, "onShowFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture)");
        mUploadCallbackAboveL = filePathCallback;
        if (videoFlag) {
            recordVideo();
        } else {
            takePhoto();
        }
        return true;
    }
    /**
     * 录像
     */
    private void recordVideo() {
        Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
        //限制时长
        intent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, 10);
        //开启摄像机
        startActivityForResult(intent, VIDEO_REQUEST);
    }
    private void takePhoto() {
        File fileUri = new File(Environment.getExternalStorageDirectory().getPath() + "/" + SystemClock.currentThreadTimeMillis() + ".jpg");
        imageUri = Uri.fromFile(fileUri);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            imageUri = FileProvider.getUriForFile(MainActivity.this, getPackageName() + ".fileprovider", fileUri);//通过FileProvider创建一个content类型的Uri
        }
        PhotoUtils.takePicture(MainActivity.this, imageUri, PHOTO_REQUEST);
    }

}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    //如果按下的是回退键且历史记录里确实还有页面
    if ((keyCode == KeyEvent.KEYCODE_BACK) && webView.canGoBack()) {
        webView.goBack();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == PHOTO_REQUEST) {
        if (null == mUploadMessage && null == mUploadCallbackAboveL) return;
        Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
        if (mUploadCallbackAboveL != null) {
            onActivityResultAboveL(requestCode, resultCode, data);
        } else if (mUploadMessage != null) {
            mUploadMessage.onReceiveValue(result);
            mUploadMessage = null;
        }
    } else if (requestCode == VIDEO_REQUEST) {
        if (null == mUploadMessage && null == mUploadCallbackAboveL) return;

        Uri result = data == null || resultCode != RESULT_OK ? null : data.getData();
        if (mUploadCallbackAboveL != null) {
            if (resultCode == RESULT_OK) {
                mUploadCallbackAboveL.onReceiveValue(new Uri[]{result});
                mUploadCallbackAboveL = null;
            } else {
                mUploadCallbackAboveL.onReceiveValue(new Uri[]{});
                mUploadCallbackAboveL = null;
            }

        } else if (mUploadMessage != null) {
            if (resultCode == RESULT_OK) {
                mUploadMessage.onReceiveValue(result);
                mUploadMessage = null;
            } else {
                mUploadMessage.onReceiveValue(Uri.EMPTY);
                mUploadMessage = null;
            }

        }
    }
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {
    if (requestCode != PHOTO_REQUEST || mUploadCallbackAboveL == null) {
        return;
    }
    Uri[] results = null;
    if (resultCode == Activity.RESULT_OK) {
        if (data == null) {
            results = new Uri[]{imageUri};
        } else {
            String dataString = data.getDataString();
            ClipData clipData = data.getClipData();
            if (clipData != null) {
                results = new Uri[clipData.getItemCount()];
                for (int i = 0; i < clipData.getItemCount(); i++) {
                    ClipData.Item item = clipData.getItemAt(i);
                    results[i] = item.getUri();
                }
            }

            if (dataString != null)
                results = new Uri[]{Uri.parse(dataString)};
        }
    }
    mUploadCallbackAboveL.onReceiveValue(results);
    mUploadCallbackAboveL = null;
}
@Override
protected void onDestroy() {
    super.onDestroy();
    if (webView != null) {
        webView.setWebViewClient(null);
        webView.setWebChromeClient(null);
        webView.loadDataWithBaseURL(null, "", "text/html", "utf-8", null);
        webView.clearHistory();

// ((ViewGroup) webView.getParent()).removeView(webView);
webView.destroy();
webView = null;
}
}
}

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1条回答 默认 最新

  • 蔡能教授，网站特聘专家 2020-08-27 16:36
    关注

    https://blog.csdn.net/cyw_god/article/details/106760160

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