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Android WebView调用本地相册的方法

时间:2020-10-03 10:14:50 | 栏目:Android代码 | 点击:

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;

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:

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:

@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:

@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:

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。

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