Android webview 允许使用当前 Android Studio 访问相机

Question

Android webview 允许使用当前 Android Studio 访问相机

我一直在尝试在我的网络视图上制作一个简单的输入按钮来访问相机和文件。我读过的解决方案各不相同，只有几行代码，没有解释它们到我在 Android Studio 中下载和打开的盲 github 项目链接（Os-Fileup 等）的位置，而且它们通常有数十个文件，但没有任何内容真的对我有帮助，因为我不知道我在寻找什么。

我尝试过各种解决方案，包括包含这个包或那个包、请求权限等，但没有一个解决方案能为我解决问题，因为我可能错误地实现了它们，或者它们适用于更旧版本的 Android 或 Android Studio。我使用的是最新版本的 Android Studio，并且仅针对 Oreo 8.1（minSdkVersion 27 和 targetSdkVersion 28）。

对于我的 webview 应用程序的初始设置，我遵循了我在某处找到的一个简单教程，除了相机之外，一切都正常。

我终于在某处读到，授予应用程序权限（例如：访问相机、设备上的应用程序）不会传递到网络视图 - 所以这就是我陷入困境的地方。只有两个文件 - AndroidManifest 和 MainActivity.java ...所以这两个文件看起来就像您在下面看到的那样 - 我到底要在这些文件中更改什么才能使按钮在应用程序中正常工作浏览器中的同一设备？

The button from the webview.loadURL page:

<input id='uploadImage' type='file' accept='image/*' name='image' />

Run Code Online (Sandbox Code Playgroud)

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="redacted.name.here">

    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" android:required="true" />
    <uses-feature android:name="android.hardware.camera.front" android:required="true" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_ns_n"
        android:label="@string/app_name"
        android:roundIcon="@drawable/ic_ns_n"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:configChanges="orientation|screenSize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Run Code Online (Sandbox Code Playgroud)

MainActivity.java


import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.CookieManager;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends AppCompatActivity {
    private WebView webview;

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        onCreate(savedInstanceState);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        webview =(WebView)findViewById(R.id.webView);
        webview.setWebViewClient(new WebViewClient());
        webview.getSettings().setJavaScriptEnabled(true);
        webview.getSettings().setDomStorageEnabled(true);
        webview.setOverScrollMode(WebView.OVER_SCROLL_NEVER);
        webview.loadUrl("https://redacted.url.here");
        CookieManager cookieManager = CookieManager.getInstance();
        cookieManager.setAcceptThirdPartyCookies(webview,true);
    }
}

Run Code Online (Sandbox Code Playgroud)

Answer 1

PEN*_*GON 5

经过额外搜索后，我发现了一些较新的代码，我可以对其进行编辑以使其对我有用，其中出现对话框询问我是否要使用相机或选择文件。

编辑包名称和 URL 以匹配您的项目。我保留了在下面的代码中复制的代码中注释掉的所有部分，但我将在我自己的项目中删除其中的大部分。

我希望这对其他人有帮助。

我没有对 HTML 或 AndroidManifest.xml 文件进行任何更改。

MainActivity.java

package {put your package name here};

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.Parcelable;
import android.provider.MediaStore;
import android.support.annotation.RequiresApi;
import android.webkit.CookieManager;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebResourceRequest;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import java.io.File;

public class MainActivity extends Activity {

    private WebView webview;
    private ValueCallback<Uri> mUploadMessage;
    private ValueCallback<Uri[]> mUploadMessages;
    private Uri mCapturedImageURI = null;
    private static final int MY_CAMERA_REQUEST_CODE = 100;
    private static final int FILECHOOSER_RESULTCODE = 1;

    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        webview =(WebView)findViewById(R.id.webView);



        webview.setOverScrollMode(WebView.OVER_SCROLL_NEVER);
        webview.loadUrl("https://{put your URL here");
        CookieManager cookieManager = CookieManager.getInstance();
        cookieManager.setAcceptThirdPartyCookies(webview,true);


        webview.setWebViewClient(new WebViewClient());

        WebSettings webSettings = webview.getSettings();
        webSettings.setJavaScriptEnabled(true);
        webSettings.setDomStorageEnabled(true);
        webview.getSettings().setJavaScriptEnabled(true);
        webview.getSettings().setDomStorageEnabled(true);
        webview.getSettings().setPluginState(WebSettings.PluginState.ON);
        webview.getSettings().setAppCacheEnabled(false);
        webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
        webview.getSettings().setUseWideViewPort(true);
        webview.getSettings().setLoadWithOverviewMode(true);
        webview.getSettings().setBuiltInZoomControls(false);
        webview.getSettings().setSupportZoom(false);
        webview.getSettings().setDefaultZoom(WebSettings.ZoomDensity.FAR);
        webview.getSettings().setDomStorageEnabled(true);
        webview.getSettings().setDatabaseEnabled(true);
        webview.getSettings().setDatabasePath("/data/data/" + webview.getContext().getPackageName() + "/databases/");

        webview.setWebChromeClient(new WebChromeClient() {

            // For api level bellow 24
            public boolean shouldOverrideUrlLoading(WebView view, String url) {

                if (url.startsWith("http")) {
                    // Return false means, web view will handle the link
                    return false;
                }

                return false;
            }


            // From api level 24
            @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
            public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest request) {
                /*Toast.makeText(mcontext, "New Method",Toast.LENGTH_SHORT).show();*/

                // Get the tel: url
                String url = request.getUrl().toString();

                if (url.startsWith("http")) {
                    // Return false means, web view will handle the link
                    return false;
                }

                return false;
            }

            // openFileChooser for Android 3.0+

           /* public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
                mUploadMessage = uploadMsg;
                openImageChooser();
            }*/

            // For Lollipop 5.0+ Devices

            public boolean onShowFileChooser(WebView mWebView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
                mUploadMessages = filePathCallback;
                openImageChooser();
                return true;
            }

            // openFileChooser for Android < 3.0

           /* public void openFileChooser(ValueCallback<Uri> uploadMsg) {
                openFileChooser(uploadMsg, "");
            }

            //openFileChooser for other Android versions

            public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
                openFileChooser(uploadMsg, acceptType);
            }*/
        });

    }

    private void openImageChooser() {
        try {

            File imageStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "FolderName");

            if (!imageStorageDir.exists()) {
                imageStorageDir.mkdirs();
            }
            File file = new File(imageStorageDir + File.separator + "IMG_" + String.valueOf(System.currentTimeMillis()) + ".jpg");
            mCapturedImageURI = Uri.fromFile(file);

            final Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);

            Intent i = new Intent(Intent.ACTION_GET_CONTENT);
            i.addCategory(Intent.CATEGORY_OPENABLE);
            i.setType("image/*");

            Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
            chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]{captureIntent});

            startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
        super.onActivityResult(requestCode, resultCode, intent);

        if (requestCode == FILECHOOSER_RESULTCODE) {

            if (null == this.mUploadMessage && null == this.mUploadMessages) {
                return;
            }

           /* Uri result;
            if (requestCode != RESULT_OK){
                result = null;
            }else {
                result = intent == null ? this.mCapturedImageURI : intent.getData();
            }
            this.mUploadMessage.onReceiveValue(result);
            this.mUploadMessage = null;*/
            if (null != mUploadMessage) {
                handleUploadMessage(requestCode, resultCode, intent);

            } else if (mUploadMessages != null) {
                handleUploadMessages(requestCode, resultCode, intent);
            }
        }
    }

    private void handleUploadMessage(int requestCode, int resultCode, Intent intent) {
        Uri result = null;
        try {
            if (resultCode != RESULT_OK) {
                result = null;
            } else {
                // retrieve from the private variable if the intent is null

                result = intent == null ? mCapturedImageURI : intent.getData();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        mUploadMessage.onReceiveValue(result);
        mUploadMessage = null;
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private void handleUploadMessages(int requestCode, int resultCode, Intent intent) {
        Uri[] results = null;
        try {
            if (resultCode != RESULT_OK) {
                results = null;
            } else {
                if (intent != null) {
                    String dataString = intent.getDataString();
                    ClipData clipData = intent.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)};
                    }
                } else {
                    results = new Uri[]{mCapturedImageURI};
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        mUploadMessages.onReceiveValue(results);
        mUploadMessages = null;
    }

}

Run Code Online (Sandbox Code Playgroud)

归档时间：	6 年前
查看次数：	8472 次
最近记录：	5 年，8 月前