本文实例为大家分享了Android WebView调用本地相册的具体实现方法,供大家参考,具体内容如下
首先要知道android本身的WebView是并不支持调用手机文件并上传的,其次WebView的内核在android每次更新的时候都是不太一样的,也是够坑爹的;不过需求又不能改,H5需要调用系统相册,还好最后还是找到方法解决了,就是要重写里面的一个方法,不过这种情况也是在5.0之前有效,5.0之后就需要重写另外的一个方法,先将这些方法一个个的列出 注意在这里我们需要重写的方法是在这个WebChromeClient类里面的;
代码语言:javascript复制private ValueCallback<Uri mUploadMessage;
private ValueCallback<Uri[] mUploadCallbackAboveL;
private final static int FILECHOOSER_RESULTCODE = 101;
当我们是5.0以下的话,用的是以下三个方法:
代码语言:javascript复制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);
}
代码语言:javascript复制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);
}
代码语言:javascript复制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);
}
值得注意的是这三种方法都是一样的,只是在不同版本下会分别调用,还有就是这个方法是重写这个WebChromeClient类里面的,别以为是我们随便写的,只是google不希望我们重写这个方法罢了,不过5.0之后就又不一样了,需要重写的是下面的这个方法:
代码语言:javascript复制@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,到了这一步我们的调用已经ok了,但还有一个需要的过程;跟我们普通的回调接收是一模一样的:
代码语言:javascript复制@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;
}
}
}
当然还有一个是让我们在5.0的情况下用的:
代码语言:javascript复制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;
}
到这一步H5基本就可以正常的调用手机的相册了。
以上就是本文的全部内容,希望对大家的学习有所帮助。