使用 WebView 直接用 控件选择相册图片
package com.moguzhuan.android.zhuan;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ClipData;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
public class MainActivity extends AppCompatActivity {
private final static String TAG = "MainActivity";
private String TMP_URL = "http://m.zhuan.com";
private WebView webview;
private String MIME = "image/*";
private ValueCallback<Uri> mUploadMessage;
private ValueCallback<Uri[]> mUploadCallbackAboveL;
private final static int FILECHOOSER_RESULTCODE = 1;
private void assignViews() {
webview = (WebView) findViewById(R.id.webview);
WebSettings settings = webview.getSettings();
settings.setUseWideViewPort(true);
settings.setLoadWithOverviewMode(true);
settings.setJavaScriptEnabled(true);
settings.setSupportZoom(true);
webview.setVerticalScrollBarEnabled(true);
webview.setHorizontalScrollBarEnabled(true);
webview.setWebViewClient(new WebViewClient(){
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub
//返回值是true的时候控制去WebView打开，为false调用系统浏览器或第三方浏览器
view.loadUrl(url);
return true;
}
});
webview.setWebChromeClient(new WebChromeClient(){
// For Android 3.0+
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(MIME);
MainActivity.this.startActivityForResult(Intent.createChooser(i, "File Chooser"), FILECHOOSER_RESULTCODE);
}
// For Android 3.0+
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(MIME);
MainActivity.this.startActivityForResult(
Intent.createChooser(i, "File Browser"),
FILECHOOSER_RESULTCODE);
}
//For Android 4.1
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(MIME);
MainActivity.this.startActivityForResult( Intent.createChooser( i, "File Browser" ), MainActivity.FILECHOOSER_RESULTCODE );
}
// For Android 5.0+
public boolean onShowFileChooser (WebView webView, ValueCallback<Uri[]> filePathCallback, WebChromeClient.FileChooserParams fileChooserParams) {
Log.d(TAG, "onShowFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture)");
mUploadCallbackAboveL = filePathCallback;
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType(MIME);
MainActivity.this.startActivityForResult(
Intent.createChooser(i, "File Browser"),
FILECHOOSER_RESULTCODE);
return true;
}
});
webview.loadUrl(TMP_URL);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
assignViews();
}
@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;
}
}
}
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
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();
}
}
if (dataString != null)
results = new Uri[]{Uri.parse(dataString)};
}
}
mUploadCallbackAboveL.onReceiveValue(results);
mUploadCallbackAboveL = null;
return;
}
}assignViews 方法中需增加一段代码，让app使用默认的浏览器直接打开链接，否则会弹出选择第三方浏览器的窗口：
webview.setWebViewClient(new WebViewClient(){
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub
//返回值是true的时候控制去WebView打开，为false调用系统浏览器或第三方浏览器
view.loadUrl(url);
return true;
}
});在 AndroidManifest.xml 中添加网络访问权限：
<uses-permission android:name="android.permission.INTERNET" />另外，需要注意一点就是通过这种方式上传的图片，在服务端接收到的 MIME 类型为
application/octet-stream
而不是一般的 image/jpeg 这种哦