Android的WebView呼叫本地相簿
阿新 • • 發佈:2018-11-20
首先要知道android本身的WebView是並不支援呼叫手機檔案並上傳的,其次WebView的核心在android每次更新的時候都是不太一樣的,也是夠坑爹的;不過需求又不能改,H5需要呼叫系統相簿,還好最後還是找到方法解決了,就是要重寫裡面的一個方法,不過這種情況也是在5.0之前有效,5.0之後就需要重寫另外的一個方法,先將這些方法一個個的列出
注意在這裡我們需要重寫的方法是在這個WebChromeClient類裡面的;
private ValueCallback<Uri> mUploadMessage;
private ValueCallback<Uri[]> mUploadCallbackAboveL;
private final static int FILECHOOSER_RESULTCODE = 101;
當我們是5.0以下的話,用的是以下三個方法:
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
Log.d(TAG, "openFileChoose(ValueCallback<Uri> uploadMsg)");
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory (Intent.CATEGORY_OPENABLE);
i.setType("image/*");
Html5Activity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"),
FILECHOOSER_RESULTCODE);
}
public void openFileChooser(ValueCallback uploadMsg, String acceptType) {
Log.d(TAG, "openFileChoose( ValueCallback uploadMsg, String acceptType )" );
mUploadMessage = uploadMsg;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
Html5Activity.this.startActivityForResult(
Intent.createChooser(i, "File Browser"),
FILECHOOSER_RESULTCODE);
}
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
Log.d(TAG, "openFileChoose(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/*");
Html5Activity.this.startActivityForResult(Intent.createChooser(i, "File Browser"),
FILECHOOSER_RESULTCODE);
}
值得注意的是這三種方法都是一樣的,只是在不同版本下會分別呼叫,還有就是這個方法是重寫這個WebChromeClient類裡面的,別以為是我們隨便寫的,只是google不希望我們重寫這個方法罷了,不過5.0之後就又不一樣了,需要重寫的是下面的這個方法:
@Override
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
mUploadCallbackAboveL = filePathCallback;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
Html5Activity.this.startActivityForResult(
Intent.createChooser(i, "File Browser"),
FILECHOOSER_RESULTCODE);
return true;
}
好了,到了這一步我們的呼叫已經ok了,但還有一個需要的過程;跟我們普通的回撥接收是一模一樣的:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == FILECHOOSER_RESULTCODE) {
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;
}
}
}
當然還有一個是讓我們在5.0的情況下用的:
private void onActivityResultAboveL(int requestCode, int resultCode, Intent data) {
if (requestCode != FILECHOOSER_RESULTCODE
|| mUploadCallbackAboveL == null) {
return;
}
Uri[] results = null;
if (resultCode == Activity.RESULT_OK) {
if (data == null) {
} 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();
Log.e(TAG, "onActivityResultAboveL: " + results[i].getPath());
}
}
if (dataString != null)
results = new Uri[]{Uri.parse(dataString)};
Log.e(TAG, "onActivityResultAboveL: " + results.length);
}
}
mUploadCallbackAboveL.onReceiveValue(results);
mUploadCallbackAboveL = null;
return;
}
到這一步H5基本就可以正常的呼叫手機的相簿了。