在 android Webview 中写入权限
Write Permission in android Webview
谁能帮我在从我的应用程序下载文件时请求 运行 时间许可 WRITE_EXTERNAL_STORAGE
?在 android 中使用 myWebview
显示我的网站,其中包含 PDF 文件,因此我需要 运行 时间权限以允许在我的应用程序中访问存储空间。
这是我的示例代码:
public class MainActivity extends AppCompatActivity {
private WebView mywebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mywebView = (WebView) findViewById(R.id.webview);
WebSettings webSettings= mywebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setDomStorageEnabled(true);
mywebView.getSettings().setLoadWithOverviewMode(true);
mywebView.getSettings().setUseWideViewPort(true);
mywebView.getSettings().setBuiltInZoomControls(true);
mywebView.getSettings().setPluginState(WebSettings.PluginState.ON);
mywebView.setWebChromeClient(new WebChromeClient());
mywebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
mywebView.loadUrl("https://moh.org.in/");// Line of Code for opening links in app
mywebView.setWebViewClient(new WebViewClient());
getSupportActionBar().hide();
mywebView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition,
String mimeType, long contentLength) {
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setMimeType(mimeType);
//------------------------COOKIE!!------------------------
String cookies = CookieManager.getInstance().getCookie(url);
request.addRequestHeader("cookie", cookies);
//------------------------COOKIE!!------------------------
request.addRequestHeader("User-Agent", userAgent);
request.setDescription("Downloading file...");
request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimeType));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
String fileName = URLUtil.guessFileName(url, contentDisposition, mimeType);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
dm.enqueue(request);
Toast.makeText(getApplicationContext(), "Downloading File", Toast.LENGTH_LONG).show();
}
});
}
//Code For Back Button
@Override
public void onBackPressed() {
if(mywebView.canGoBack()) {
mywebView.goBack();
} else {
super.onBackPressed();
}
}
}
解决方案
步骤 1. 将权限添加到您的 AndroidManifest.xml
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.kotlinapp">
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:requestLegacyExternalStorage="true"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
第二步在MainActivity里面写代码逻辑
如果没有权限,显示权限对话框,如果用户允许权限,则下载文件。
如果权限被授予,则下载文件
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final int WRITE_EXTERNAL_STORAGE_RC = 100;
private WebView mywebView;
private String url, userAgent, contentDisposition, mimeType;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mywebView = (WebView) findViewById(R.id.webview);
WebSettings webSettings = mywebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setDomStorageEnabled(true);
mywebView.getSettings().setLoadWithOverviewMode(true);
mywebView.getSettings().setUseWideViewPort(true);
mywebView.getSettings().setBuiltInZoomControls(true);
mywebView.getSettings().setPluginState(WebSettings.PluginState.ON);
mywebView.setWebChromeClient(new WebChromeClient());
mywebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
mywebView.loadUrl("https://moh.org.in/");// Line of Code for opening links in app
mywebView.setWebViewClient(new WebViewClient());
getSupportActionBar().hide();
mywebView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition,
String mimeType, long contentLength) {
MainActivity.this.url = url;
MainActivity.this.userAgent = userAgent;
MainActivity.this.contentDisposition = contentDisposition;
MainActivity.this.mimeType = mimeType;
String permission = Manifest.permission.WRITE_EXTERNAL_STORAGE;
if (ActivityCompat.checkSelfPermission(MainActivity.this, permission)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
WRITE_EXTERNAL_STORAGE_RC);
} else {
downloadFile();
}
}
});
}
private void downloadFile() {
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setMimeType(mimeType);
//------------------------COOKIE!!------------------------
String cookies = CookieManager.getInstance().getCookie(url);
request.addRequestHeader("cookie", cookies);
//------------------------COOKIE!!------------------------
request.addRequestHeader("User-Agent", userAgent);
request.setDescription("Downloading file...");
request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimeType));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
String fileName = URLUtil.guessFileName(url, contentDisposition, mimeType);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
dm.enqueue(request);
Toast.makeText(getApplicationContext(), "Downloading File", Toast.LENGTH_LONG).show();
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == WRITE_EXTERNAL_STORAGE_RC) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
downloadFile();
}
}
}
//Code For Back Button
@Override
public void onBackPressed() {
if (mywebView.canGoBack()) {
mywebView.goBack();
} else {
super.onBackPressed();
}
}
}
谁能帮我在从我的应用程序下载文件时请求 运行 时间许可 WRITE_EXTERNAL_STORAGE
?在 android 中使用 myWebview
显示我的网站,其中包含 PDF 文件,因此我需要 运行 时间权限以允许在我的应用程序中访问存储空间。
这是我的示例代码:
public class MainActivity extends AppCompatActivity {
private WebView mywebView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mywebView = (WebView) findViewById(R.id.webview);
WebSettings webSettings= mywebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setDomStorageEnabled(true);
mywebView.getSettings().setLoadWithOverviewMode(true);
mywebView.getSettings().setUseWideViewPort(true);
mywebView.getSettings().setBuiltInZoomControls(true);
mywebView.getSettings().setPluginState(WebSettings.PluginState.ON);
mywebView.setWebChromeClient(new WebChromeClient());
mywebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
mywebView.loadUrl("https://moh.org.in/");// Line of Code for opening links in app
mywebView.setWebViewClient(new WebViewClient());
getSupportActionBar().hide();
mywebView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition,
String mimeType, long contentLength) {
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setMimeType(mimeType);
//------------------------COOKIE!!------------------------
String cookies = CookieManager.getInstance().getCookie(url);
request.addRequestHeader("cookie", cookies);
//------------------------COOKIE!!------------------------
request.addRequestHeader("User-Agent", userAgent);
request.setDescription("Downloading file...");
request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimeType));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
String fileName = URLUtil.guessFileName(url, contentDisposition, mimeType);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
dm.enqueue(request);
Toast.makeText(getApplicationContext(), "Downloading File", Toast.LENGTH_LONG).show();
}
});
}
//Code For Back Button
@Override
public void onBackPressed() {
if(mywebView.canGoBack()) {
mywebView.goBack();
} else {
super.onBackPressed();
}
}
}
解决方案
步骤 1. 将权限添加到您的 AndroidManifest.xml
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.kotlinapp">
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:requestLegacyExternalStorage="true"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
第二步在MainActivity里面写代码逻辑
如果没有权限,显示权限对话框,如果用户允许权限,则下载文件。
如果权限被授予,则下载文件
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final int WRITE_EXTERNAL_STORAGE_RC = 100;
private WebView mywebView;
private String url, userAgent, contentDisposition, mimeType;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mywebView = (WebView) findViewById(R.id.webview);
WebSettings webSettings = mywebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setDomStorageEnabled(true);
mywebView.getSettings().setLoadWithOverviewMode(true);
mywebView.getSettings().setUseWideViewPort(true);
mywebView.getSettings().setBuiltInZoomControls(true);
mywebView.getSettings().setPluginState(WebSettings.PluginState.ON);
mywebView.setWebChromeClient(new WebChromeClient());
mywebView.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
mywebView.loadUrl("https://moh.org.in/");// Line of Code for opening links in app
mywebView.setWebViewClient(new WebViewClient());
getSupportActionBar().hide();
mywebView.setDownloadListener(new DownloadListener() {
@Override
public void onDownloadStart(String url, String userAgent, String contentDisposition,
String mimeType, long contentLength) {
MainActivity.this.url = url;
MainActivity.this.userAgent = userAgent;
MainActivity.this.contentDisposition = contentDisposition;
MainActivity.this.mimeType = mimeType;
String permission = Manifest.permission.WRITE_EXTERNAL_STORAGE;
if (ActivityCompat.checkSelfPermission(MainActivity.this, permission)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
WRITE_EXTERNAL_STORAGE_RC);
} else {
downloadFile();
}
}
});
}
private void downloadFile() {
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
request.setMimeType(mimeType);
//------------------------COOKIE!!------------------------
String cookies = CookieManager.getInstance().getCookie(url);
request.addRequestHeader("cookie", cookies);
//------------------------COOKIE!!------------------------
request.addRequestHeader("User-Agent", userAgent);
request.setDescription("Downloading file...");
request.setTitle(URLUtil.guessFileName(url, contentDisposition, mimeType));
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
String fileName = URLUtil.guessFileName(url, contentDisposition, mimeType);
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, fileName);
DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
dm.enqueue(request);
Toast.makeText(getApplicationContext(), "Downloading File", Toast.LENGTH_LONG).show();
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
@NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == WRITE_EXTERNAL_STORAGE_RC) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
downloadFile();
}
}
}
//Code For Back Button
@Override
public void onBackPressed() {
if (mywebView.canGoBack()) {
mywebView.goBack();
} else {
super.onBackPressed();
}
}
}