效果如下:
使用Android WebView加載網頁，網頁中調用文件選擇功能實現
網頁參考代碼
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,maximun-scale=1,mininum-scale=1,user-scale=1">
<tile>文件選擇</tile>
<style>
.filechooser {
width: 95%;
height: 50px;
-webkit-background-clip: border-box;
}
</style>
<script>
var display = function(){
var path = document.getElementById("file_chooser").textContent;
document.getElementById("filechooser_display").innerHTML("<b>"+path+"</b>");
}
</script>
</head>
<body>
<ul class="listview">
<li class="listviewItem">
<fieldset class="itemset">
<input class="filechooser" id="file_chooser" type="file" placeholder="選擇文件" onchange="display()" oninput="display()"><br>
<p id="filechooser_display"></p>
<div class="line_black"></div>
</fieldset>
</li>
</ul>
</body>
</html>
Android代碼
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private WebView mWebView;
private ValueCallback<Uri> uploadFile;
private ValueCallback<Uri[]> uploadFiles;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mWebView = findViewById(R.id.webview);
initWebView();
mWebView.loadUrl("file:///android_asset/fileChooser.html");
}
private void initWebView() {
WebSettings settings = mWebView.getSettings();
settings.setJavaScriptEnabled(true);
settings.setSupportZoom(false);
settings.setBuiltInZoomControls(false);
mWebView.setWebChromeClient(new WebChromeClient() {
// For Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
Log.i("test", "openFileChooser 1");
MainActivity.this.uploadFile = uploadMsg;
openFileChooseProcess();
}
// For Android < 3.0
public void openFileChooser(ValueCallback<Uri> uploadMsgs) {
Log.i("test", "openFileChooser 2");
MainActivity.this.uploadFile = uploadMsgs;
openFileChooseProcess();
}
// For Android > 4.1.1
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
Log.i("test", "openFileChooser 3");
MainActivity.this.uploadFile = uploadMsg;
openFileChooseProcess();
}
// For Android >= 5.0
public boolean onShowFileChooser(WebView webView,
ValueCallback<Uri[]> filePathCallback,
WebChromeClient.FileChooserParams fileChooserParams) {
Log.i("test", "openFileChooser 4:" + filePathCallback.toString());
MainActivity.this.uploadFiles = filePathCallback;
openFileChooseProcess();
return true;
}
});
}
private void openFileChooseProcess() {
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("*/*");
startActivityForResult(Intent.createChooser(i, "上傳文件"), 0);
}
@Override
protected void onResume() {
super.onResume();
mWebView.onResume();
}
@Override
protected void onPause() {
super.onPause();
mWebView.onPause();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 0) {
if (resultCode == RESULT_OK) {
if (null != uploadFile) {
Uri result = data == null ? null
: data.getData();
uploadFile.onReceiveValue(result);
uploadFile = null;
}
if (null != uploadFiles) {
Uri result = data == null ? null
: data.getData();
uploadFiles.onReceiveValue(new Uri[]{result});
uploadFiles = null;
}
} else if (resultCode == RESULT_CANCELED) {
if (null != uploadFile) {
uploadFile.onReceiveValue(null);
uploadFile = null;
}
}
}
}
}
核心代碼是爲WebView設置WebChromeClient實現openFileChooser方法
mWebView.setWebChromeClient(new WebChromeClient() {
// For Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
Log.i("test", "openFileChooser 1");
MainActivity.this.uploadFile = uploadMsg;
openFileChooseProcess();
}
// For Android < 3.0
public void openFileChooser(ValueCallback<Uri> uploadMsgs) {
Log.i("test", "openFileChooser 2");
MainActivity.this.uploadFile = uploadMsgs;
openFileChooseProcess();
}
// For Android > 4.1.1
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
Log.i("test", "openFileChooser 3");
MainActivity.this.uploadFile = uploadMsg;
openFileChooseProcess();
}
// For Android >= 5.0
public boolean onShowFileChooser(WebView webView,
ValueCallback<Uri[]> filePathCallback,
WebChromeClient.FileChooserParams fileChooserParams) {
Log.i("test", "openFileChooser 4:" + filePathCallback.toString());
MainActivity.this.uploadFiles = filePathCallback;
openFileChooseProcess();
return true;
}
});