layout: post
author: zjhChester
header-img: img/post-bg-universe.jpg
catalog: true
tags:
- android
安卓webView使用到文件上傳流遇到的問題
前言:
做的h5網頁可以直接套一個webView的殼子直接運行,但是如果裏頭有<input type='file'>
的時候,需要對webView進行設置,不然無法進行文件上傳,此問題是我做刷臉登錄的時候遇到的問題。
注意事項:
1、需要特別注意和遇到的坑的是,調用相機和相冊使用到的Uri需要全局化,不能依靠startActivityForResult傳遞參數,即便傳遞的核驗碼一致,得到的uri都可能是null,主要是
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
這個裏頭的data會爲空,所以,如果上傳爲單文件的時候,我們可以讓圖片的uri直接設置爲全局變量,在最終加載到客戶端上拿到正確的uri就可以正常上傳
2、第二個坑是保存圖片的路徑問題,在調用相機拍攝照片的時候,存放照片的地址最好不要寫sd卡的實際地址,可能會因爲權限問題,保存失敗,在適配機型方面就不好拓展,所以最好就保存到相對目錄getExternalCacheDir()
裏面。
String fileName = "IMG_" + DateFormat.format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA)) + ".jpg";
File file = new File(getExternalCacheDir(), fileName);
try {
if(file.exists()){
file.delete();
}
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
if(Build.VERSION.SDK_INT>=24){
imageUri = FileProvider.getUriForFile(MainActivity.this,getPackageName()+".fileprovider",file);
}else{
imageUri = Uri.fromFile(file);
}
源碼:
話不多說,源碼奉上:
package cn.tfs.yunge;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.FileProvider;
import android.annotation.TargetApi;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.text.format.DateFormat;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.util.Calendar;
import java.util.Locale;
public class MainActivity extends AppCompatActivity {
private android.webkit.ValueCallback<Uri[]> mUploadCallbackAboveL;
private android.webkit.ValueCallback<Uri> mUploadCallbackBelow;
private Uri imageUri;
private int REQUEST_CODE = 1;
private ProgressBar progressBar;
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
progressBar = findViewById(R.id.pb);
ActionBar actionBar = getSupportActionBar();
if(actionBar!=null){
actionBar.hide();
}
webView = findViewById(R.id.web_view);
webView.canGoBack();
webView.getSettings().setJavaScriptEnabled(true);
webView.setWebViewClient(new WebViewClient());
webView.loadUrl("你加載的地址");
webView.setWebChromeClient(new WebChromeClient() {
@Override
public void onProgressChanged(WebView view, int newProgress) {
if (newProgress == 100) {
progressBar.setVisibility(View.GONE);//加載完網頁進度條消失
} else {
progressBar.setProgress(newProgress);//設置進度值
progressBar.setVisibility(View.VISIBLE);//開始加載網頁時顯示進度條
}
}
/**
* 8(Android 2.2) <= API <= 10(Android 2.3)回調此方法
*/
private void openFileChooser(android.webkit.ValueCallback<Uri> uploadMsg) {
Log.e("WangJ", "運行方法 openFileChooser-1");
// (2)該方法回調時說明版本API < 21,此時將結果賦值給 mUploadCallbackBelow,使之 != null
mUploadCallbackBelow = uploadMsg;
takePhoto();
}
/**
* 11(Android 3.0) <= API <= 15(Android 4.0.3)回調此方法
*/
public void openFileChooser(android.webkit.ValueCallback<Uri> uploadMsg, String acceptType) {
Log.e("WangJ", "運行方法 openFileChooser-2 (acceptType: " + acceptType + ")");
// 這裏我們就不區分input的參數了,直接用拍照
openFileChooser(uploadMsg);
}
/**
* 16(Android 4.1.2) <= API <= 20(Android 4.4W.2)回調此方法
*/
public void openFileChooser(android.webkit.ValueCallback<Uri> uploadMsg, String acceptType, String capture) {
Log.e("WangJ", "運行方法 openFileChooser-3 (acceptType: " + acceptType + "; capture: " + capture + ")");
// 這裏我們就不區分input的參數了,直接用拍照
openFileChooser(uploadMsg);
}
/**
* API >= 21(Android 5.0.1)回調此方法
*/
@Override
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> valueCallback, FileChooserParams fileChooserParams) {
Log.e("WangJ", "運行方法 onShowFileChooser");
// (1)該方法回調時說明版本API >= 21,此時將結果賦值給 mUploadCallbackAboveL,使之 != null
mUploadCallbackAboveL = valueCallback;
takePhoto();
return true;
}
});
}
/**
* Android API < 21(Android 5.0)版本的回調處理
* @param resultCode 選取文件或拍照的返回碼
* @param data 選取文件或拍照的返回結果
*/
private void chooseBelow(int resultCode, Intent data) {
Log.e("WangJ", "返回調用方法--chooseBelow");
if (RESULT_OK == resultCode) {
updatePhotos();
if (data != null) {
// 這裏是針對文件路徑處理
Uri uri = data.getData();
if (uri != null) {
Log.e("WangJ", "系統返回URI:" + uri.toString());
mUploadCallbackBelow.onReceiveValue(uri);
} else {
mUploadCallbackBelow.onReceiveValue(null);
}
} else {
// 以指定圖像存儲路徑的方式調起相機,成功後返回data爲空
Log.e("WangJ", "自定義結果:" + imageUri.toString());
mUploadCallbackBelow.onReceiveValue(imageUri);
}
} else {
mUploadCallbackBelow.onReceiveValue(null);
}
mUploadCallbackBelow = null;
}
/**
* Android API >= 21(Android 5.0) 版本的回調處理
* @param resultCode 選取文件或拍照的返回碼
* @param data 選取文件或拍照的返回結果
*/
private void chooseAbove(int resultCode, Intent data) {
Log.e("WangJ", "返回調用方法--chooseAbove");
if (RESULT_OK == resultCode) {
updatePhotos();
if (data != null) {
// 這裏是針對從文件中選圖片的處理
Uri[] results;
Uri uriData = imageUri;
System.out.println("chooseAbove"+uriData);
if (uriData != null) {
results = new Uri[]{uriData};
for (Uri uri : results) {
Log.e("WangJ", "系統返回URI:" + uri.toString());
}
mUploadCallbackAboveL.onReceiveValue(results);
} else {
mUploadCallbackAboveL.onReceiveValue(null);
}
} else {
Log.e("WangJ", "自定義結果:" + imageUri.toString());
mUploadCallbackAboveL.onReceiveValue(new Uri[]{imageUri});
}
} else {
mUploadCallbackAboveL.onReceiveValue(null);
}
mUploadCallbackAboveL = null;
}
private void updatePhotos() {
// 該廣播即使多發(即選取照片成功時也發送)也沒有關係,只是喚醒系統刷新媒體文件
Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
intent.setData(imageUri);
sendBroadcast(intent);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_CODE) {
// 經過上邊(1)、(2)兩個賦值操作,此處即可根據其值是否爲空來決定採用哪種處理方法
if (mUploadCallbackBelow != null) {
chooseBelow(resultCode, data);
} else if (mUploadCallbackAboveL != null) {
chooseAbove(resultCode, data);
} else {
Toast.makeText(this, "發生錯誤", Toast.LENGTH_SHORT).show();
}
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onDestroy() {
if (webView != null) {
webView.loadDataWithBaseURL(null, "", "text/html", "utf-8", null);
webView.clearHistory();
((ViewGroup) webView.getParent()).removeView(webView);
webView.destroy();
webView = null;
}
super.onDestroy();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && webView.canGoBack()) {
webView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
/**
* 調用相機
*/
private void takePhoto() {
// // 指定拍照存儲位置的方式調起相機
String fileName = "IMG_" + DateFormat.format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA)) + ".jpg";
File file = new File(getExternalCacheDir(), fileName);
try {
if(file.exists()){
file.delete();
}
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
if(Build.VERSION.SDK_INT>=24){
imageUri = FileProvider.getUriForFile(MainActivity.this,getPackageName()+".fileprovider",file);
}else{
imageUri = Uri.fromFile(file);
}
// 指定拍照存儲位置的方式調起相機
// String filePath = Environment.getExternalStorageDirectory() + File.separator
// + Environment.DIRECTORY_PICTURES + File.separator;
// String fileName = "IMG_" + DateFormat.format("yyyyMMdd_hhmmss", Calendar.getInstance(Locale.CHINA)) + ".jpg";
// imageUri = Uri.fromFile(new File(filePath + fileName));
// Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
// startActivityForResult(intent, REQUEST_CODE);
// 選擇圖片(不包括相機拍照),則不用成功後發刷新圖庫的廣播
// Intent i = new Intent(Intent.ACTION_GET_CONTENT);
// i.addCategory(Intent.CATEGORY_OPENABLE);
// i.setType("image/*");
// startActivityForResult(Intent.createChooser(i, "Image Chooser"), REQUEST_CODE);
Intent captureIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
System.out.println("imageUri:"+imageUri);
// Intent chooserIntent = Intent.createChooser(Photo, "Image Chooser");
// chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[]{captureIntent});
startActivityForResult(captureIntent, REQUEST_CODE);
System.out.println("captureIntent:"+captureIntent);
}
}
有問題或者需要幫助的同學聯繫郵箱[email protected]