Android Java webview 加载本地html

方法一：
直接加载文件

final String filePath = "file:///android_asset/privacy_terms/privacy.html";
webView.loadUrl(filePath);
readTxtFile(getArguments().getString("fileName"));

方法二：
加载字符串

String fileContent = fileNamePrivacy = PrivacyDialogFragment.readTxtFile("privacy.html", this);
String contentTxt = fileContent;
        webView.getSettings().setDefaultTextEncodingName("utf-8");
        webView.loadDataWithBaseURL(null, contentTxt, "text/html", "utf-8", null);

public static String readTxtFile(String fileName, Context context) {
        try {
            InputStream is = context.getResources().getAssets().open("privacy_terms/" + fileName);
            int lenght = is.available();
            byte[]  buffer = new byte[lenght];
            is.read(buffer);
            String result = new String(buffer, "utf8");
            return result;
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

package com.chison.android.pu.View.Privacy;
import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Rect;
import android.graphics.drawable.ColorDrawable;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.DialogFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.TextView;
import com.chison.android.pu.R;
import com.chison.android.pu.Utils.Helper.LanguageUtil;
import java.io.InputStream;
public class PrivacyDialogFragment extends DialogFragment {
private WebView webView;
private Button agreeButton;
private View rootView;
private String contentTxt;
private Handler handler;
private View.OnClickListener onItemClickListener;
public static PrivacyDialogFragment newInstance(String titleTxt, String btnTxt, String fileName) {
Bundle args = new Bundle();
args.putString("title",titleTxt);
args.putString("buttonTitle",btnTxt);
args.putString("fileName",fileName);
PrivacyDialogFragment fragment = new PrivacyDialogFragment();
fragment.setArguments(args);
return fragment;
}
// public static PrivacyDialogFragment newInstance(String titleTxt, String btnTxt, String filePath) {
// Bundle args = new Bundle();
// args.putString("title",titleTxt);
// args.putString("buttonTitle",btnTxt);
// args.putString("filePath",filePath);
// PrivacyDialogFragment fragment = new PrivacyDialogFragment();
// fragment.setArguments(args);
// return fragment;
// }
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setStyle(STYLE_NORMAL, R.style.Dialog_FullScreen);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Dialog dialog = getDialog();
if(dialog != null) {
Window window = dialog.getWindow();
if (window != null) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
window.getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
} else {
window.addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
}
}
}
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
getDialog().setCanceledOnTouchOutside(false);
getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
setCancelable(false);
if(rootView ==null){
rootView = inflater.inflate(R.layout.dialog_fragment_privacy, container,false);
}
webView = rootView.findViewById(R.id.webview_privacy);
agreeButton= rootView.findViewById(R.id.button_agree);
agreeButton.setText(getArguments().getString("buttonTitle"));
TextView titleTextView = rootView.findViewById(R.id.textview_header);
titleTextView.setText(getArguments().getString("title"));
if (onItemClickListener != null) {
//绑定监听事件
agreeButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dismiss();
onItemClickListener.onClick(v);
}
}
);
} else {
dismiss();
}
// final String filePath = getArguments().getString("filePath");
// webView.loadUrl(filePath);
// readTxtFile(getArguments().getString("fileName"));
webView.getSettings().setUseWideViewPort(true);//關鍵點
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN); //这个是国外网站Stack Overflow推荐提升加载速度的方式
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { // chromium, enable hardware acceleration
webView.setLayerType(View.LAYER_TYPE_HARDWARE, null);
} else {
webView.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
webView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
webView.setBackgroundColor(0);
webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setRenderPriority(WebSettings.RenderPriority.HIGH);
webView.setLayerType(View.LAYER_TYPE_SOFTWARE,null);
contentTxt = getArguments().getString("fileName");
webView.getSettings().setDefaultTextEncodingName("utf-8");
webView.loadDataWithBaseURL(null, contentTxt, "text/html", "utf-8", null);
rootView.setVisibility(View.INVISIBLE);
webView.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url)
{
super.onPageFinished(view, url);
// 加载完成
rootView.setVisibility(View.VISIBLE);
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon)
{
super.onPageStarted(view, url, favicon);
// 加载开始
}
});
return rootView;
}
/**
* 功能：Java读取txt文件的内容
* 步骤：1：先获得文件句柄
* 2：获得文件句柄当做是输入一个字节码流，需要对这个输入流进行读取
* 3：读取到输入流后，需要读取生成字节流
* 4：一行一行的输出。readline()。
* 备注：需要考虑的是异常情况
* @param fileName
*/
public static String readTxtFile(String fileName, Context context) {
try {
InputStream is = context.getResources().getAssets().open("privacy_terms/" + fileName);
int lenght = is.available();
byte[] buffer = new byte[lenght];
is.read(buffer);
String result = new String(buffer, "utf8");
return result;
} catch (Exception e) {
e.printStackTrace();
return "";
}
}
public int getContextRect() {
Activity activity = getActivity();
Rect rect = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(rect);
return rect.height();
}
@Override
public void onStart() {
super.onStart();
Window window = getDialog().getWindow();
WindowManager.LayoutParams layoutParams = window.getAttributes();
window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
layoutParams.dimAmount = 0.2f;
window.setAttributes(layoutParams);
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
LanguageUtil.resetDefaultLanguage(context);
if (context instanceof View.OnClickListener) {
onItemClickListener = (View.OnClickListener) context;
} else {
}
}
}