WebView Example
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />package com.wallet.testwebview;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.webkit.JavascriptInterface;
import android.webkit.JsResult;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;
import android.widget.Toast;
import androidx.annotation.Nullable;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
public class WebViewActivity extends AppCompatActivity {
private static final String TAG = "WebViewActivity";
private WebView webView;
private ProgressBar progressBar;
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_web_view);
if (Constant.second != null && !Constant.second.isFinishing()) {
Constant.second.finish();
}
progressBar = (ProgressBar) findViewById(R.id.progressbar);
webView = (WebView) findViewById(R.id.webview);
webView.setBackgroundColor(0);
Intent intent = getIntent();
String url = intent.getStringExtra("url");
// url = "http://demo.gemini-tiger.cn/order";
webView.loadUrl(url);
//添加js监听 这样html就能调用客户端
webView.addJavascriptInterface(this, "PWA");
webView.setWebChromeClient(webChromeClient);
webView.setWebViewClient(webViewClient);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webView.setWebContentsDebuggingEnabled(true);
webSettings.setSupportMultipleWindows(true);
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);//允许js弹出窗口
webSettings.setSupportMultipleWindows(true);
webSettings.setDomStorageEnabled(true);
webSettings.setDatabaseEnabled(true);
webSettings.setAllowFileAccess(true);
webSettings.setBlockNetworkLoads(false); // 是否从网络获取资源
/**
* LOAD_CACHE_ONLY: 不使用网络，只读取本地缓存数据
* LOAD_DEFAULT: （默认）根据cache-control决定是否从网络上取数据。
* LOAD_NO_CACHE: 不使用缓存，只从网络获取数据.
* LOAD_CACHE_ELSE_NETWORK，只要本地有，无论是否过期，或者no-cache，都使用缓存中的数据。
*/
webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE);
//支持屏幕缩放
webSettings.setSupportZoom(true);
webSettings.setBuiltInZoomControls(true);
//不显示webview缩放按钮
webSettings.setDisplayZoomControls(false);
webSettings.setUseWideViewPort(true); //将图片调整到适合webview的大小
webSettings.setLoadWithOverviewMode(true); // 缩放至屏幕的大小
findViewById(R.id.bt_sx).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
webView.reload();
}
});
}
//WebViewClient主要帮助WebView处理各种通知、请求事件
private WebViewClient webViewClient = new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {//页面加载完成
Log.i(TAG, "加载完成url:" + url);
progressBar.setVisibility(View.GONE);
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {//页面开始加载
Log.i(TAG, "加载url:" + url);
progressBar.setVisibility(View.VISIBLE);
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Log.i(TAG, "拦截url:" + url);
return super.shouldOverrideUrlLoading(view, url);
}
};
private static ValueCallback<Uri[]> filePathCallback1;
//WebChromeClient support WebView to process Javascript dialog, web icon, web title, loading progress, etc
private WebChromeClient webChromeClient = new WebChromeClient() {
//Don't support js alert pop-up. Need to montior and pop-up through dialog.
@Override
public boolean onJsAlert(WebView webView, String url, String message, JsResult result) {
AlertDialog.Builder localBuilder = new AlertDialog.Builder(webView.getContext());
localBuilder.setMessage(message).setPositiveButton("Yes", null);
localBuilder.setCancelable(false);
localBuilder.create().show();
//Note:
//Must use this code: result.confirm():
//The result is "Yes" status and wakeup WebCore thread at the same time
//Cannot click the confirm button if not
result.confirm();
return true;
}
//Get web title
@Override
public void onReceivedTitle(WebView view, String title) {
super.onReceivedTitle(view, title);
Log.i(TAG, "web title:" + title);
}
//callback of loading progress
@Override
public void onProgressChanged(WebView view, int newProgress) {
progressBar.setProgress(newProgress);
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
public boolean onShowFileChooser(WebView webView, ValueCallback<Uri[]> filePathCallback, FileChooserParams fileChooserParams) {
//return super.onShowFileChooser(webView, filePathCallback, fileChooserParams);
filePathCallback1 = filePathCallback;
//Convert the format type received by the front-end H5 into a string without a semicolon after it
String[] acceptTypes = fileChooserParams.getAcceptTypes();
String acceptType = "*/*";
StringBuilder sb = new StringBuilder();
if (acceptTypes.length > 0) {
for (String type : acceptTypes) {
sb.append(type).append(';');
}
}
if (sb.length() > 0) {
String typeStr = sb.toString();
acceptType = typeStr.substring(0, typeStr.length() - 1);
}
//According to the judgment, trigger related operations, such as file selection, taking pictures, etc. For details, please refer to the step-3
//Here, you can also pop up a dialog box for the user to choose. Remember to call the callback onReceiveValue method after the dialog box pops up, otherwise there will be a bug that the dialog box cannot be popped up next time.
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, acceptType);
WebViewActivity.this.startActivityForResult(intent, 15);
return true;
}
};
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
if (requestCode == 15) {
if (resultCode == Activity.RESULT_OK) {
Uri imgUri = data.getData();
Uri[] result = new Uri[]{imgUri};
filePathCallback1.onReceiveValue(result);
} else {
filePathCallback1.onReceiveValue(new Uri[]{});
}
}
super.onActivityResult(requestCode, resultCode, data);
}
@JavascriptInterface
public void bindSuc(String str) {
Log.i(TAG, "bindSuc: str = " + str);
finish();
}
private void showToast(String str) {
Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
}
}
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