安卓的webView嵌入网页后，发送图片至网页，网页请求文件操作

最新推荐文章于 2021-05-26 09:45:25 发布

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最新推荐文章于 2021-05-26 09:45:25 发布

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本文详细介绍了如何在Android应用中使用WebView实现图片上传功能。针对不同Android版本，提供了兼容的图片选择器解决方案，包括初始化WebView、设置WebChromeClient以及处理 onActivityResult 方法来接收和响应图片选择结果。

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public class WebViewDemo extends FragmentActivity {

private static final int FILE_SELECT_CODE = 0;

private WebView webView;
private ValueCallback<Uri> mUploadMessage;//回调图片选择，4.4以下
private ValueCallback<Uri[]> mUploadCallbackAboveL;//回调图片选择，5.0以上

@Override
protected void onCreate(Bundle arg0) {
super.onCreate(arg0);
setContentView(R.layout.content_main);
initWebView();

}

@SuppressLint("SetJavaScriptEnabled")
private void initWebView() {
webView = (WebView) findViewById(R.id.webview);

WebView webView = (WebView) findViewById(R.id.webview);
//允许JavaScript执行
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setLoadsImagesAutomatically(true);
webView.setVerticalScrollBarEnabled(false);
//运行webview通过URI获取安卓文件
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setAllowFileAccessFromFileURLs(true);
webView.getSettings().setAllowUniversalAccessFromFileURLs(true);

webView.setWebChromeClient(new MyWebChromeClient());//设置可以打开图片管理器
webView.loadUrl("file:///android_asset/demo81.htm");

}

private class MyWebChromeClient extends WebChromeClient {

// For Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg) {

mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Chooser"), FILE_SELECT_CODE);

}

// For Android 3.0+
public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
startActivityForResult(Intent.createChooser(i, "File Browser"), FILE_SELECT_CODE);
}

// For Android 4.1
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
startActivityForResult(Intent.createChooser(i, "File Chooser"), FILE_SELECT_CODE);

}

// For Android 5.0+
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
mUploadCallbackAboveL = filePathCallback;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
startActivityForResult(
Intent.createChooser(i, "File Browser"),
FILE_SELECT_CODE);
return true;
}

}

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode != Activity.RESULT_OK) {
return;
}

switch (requestCode) {
case FILE_SELECT_CODE: {
if (Build.VERSION.SDK_INT >= 21) {//5.0以上版本处理
Uri uri = data.getData();
Uri[] uris = new Uri[]{uri};
/* ClipData clipData = data.getClipData(); //选择多张
if (clipData != null) {
for (int i = 0; i < clipData.getItemCount(); i++) {
ClipData.Item item = clipData.getItemAt(i);
Uri uri = item.getUri();
uris[i]=uri;
}
}*/
mUploadCallbackAboveL.onReceiveValue(uris);//回调给js
} else {//4.4以下处理
Uri uri = data.getData();
mUploadMessage.onReceiveValue(uri);
}