Webview扩展之改变字体大小

改变WebView字体大小效果：


  


直接上代码：

package com.example.zhihuibj;

import java.lang.annotation.Annotation;

import com.lidroid.xutils.view.annotation.event.OnChildClick;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.text.AlteredCharSequence;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebSettings.TextSize;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ImageButton;
import android.widget.ProgressBar;

public class WebViewActivity extends Activity implements OnClickListener{

private ProgressBar mProgressBar;
private WebView mWebView;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.webview_newsdatail);

mWebView = (WebView) findViewById(R.id.wb_webview_newsdatail_webviewcontent);

ImageButton mImageButton_Back = (ImageButton) findViewById(R.id.ib_webview_newsdatail_back);
ImageButton mImageButton_textsize= (ImageButton) findViewById(R.id.ib_webview_newsdatail_textsize);
ImageButton mImageButton_share =(ImageButton) findViewById(R.id.ib_webview_newsdatail_share);
mProgressBar = (ProgressBar) findViewById(R.id.pb_webview_newsdatail_progressbar);

mImageButton_Back.setOnClickListener(this);
mImageButton_textsize.setOnClickListener(this);
mImageButton_share.setOnClickListener(this);

//根据键值获得url
String webview_url=getIntent().getStringExtra("webview_url");//得到URL

WebSettings webview_settings = mWebView.getSettings();
//使能JavaScript
webview_settings.setJavaScriptEnabled(true);
//显示放大缩小按钮
webview_settings.setDisplayZoomControls(true);
//双击放大或缩放
webview_settings.setUseWideViewPort(true);

/*
* 当前作用：用于获得页面加载的状态：开始加载，加载结束，在本应用中加载
*/
mWebView.setWebViewClient(new WebViewClient(){

/*
* 所有跳转的链接都会在此回调中进行调用
* */
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
System.out.println("跳转URL ..."+url);
view.loadUrl(url);//防止调用系统自带的浏览器打开网页
return true;
}

/*
* 开始加载网页
* @see android.webkit.WebViewClient#onPageStarted(android.webkit.WebView, java.lang.String, android.graphics.Bitmap)
*/
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
System.out.println("onPageStarted.... ");
mProgressBar.setVisibility(View.VISIBLE);
}

/*
* 加载网页结束
* @see android.webkit.WebViewClient#onPageFinished(android.webkit.WebView, java.lang.String)
*/
@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);
System.out.println("onPageFinished.... ");
mProgressBar.setVisibility(View.INVISIBLE);
}

});

/*
* 当前作用：获得网页信息：得到网页标题，网页图标，网页加载进度
*/
mWebView.setWebChromeClient(new WebChromeClient(){
/*
* 获得webView的标题
* @see android.webkit.WebChromeClient#onReceivedTitle(android.webkit.WebView, java.lang.String)
*/
@Override
public void onReceivedTitle(WebView view, String title) {
// TODO Auto-generated method stub
super.onReceivedTitle(view, title);
System.out.println("title : "+title);
}
/*
* 获得标题图标
* @see android.webkit.WebChromeClient#onReceivedIcon(android.webkit.WebView, android.graphics.Bitmap)
*/
@Override
public void onReceivedIcon(WebView view, Bitmap icon) {
// TODO Auto-generated method stub
super.onReceivedIcon(view, icon);
}
/*
* 加载进度
* @see android.webkit.WebChromeClient#onProgressChanged(android.webkit.WebView, int)
*/
@Override
public void onProgressChanged(WebView view, int newProgress) {
// TODO Auto-generated method stub
super.onProgressChanged(view, newProgress);
System.out.println("newProgress :"+newProgress);
}
});

mWebView.loadUrl(webview_url);

}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.ib_webview_newsdatail_back:
finish();
break;
case R.id.ib_webview_newsdatail_share:

break;
case R.id.ib_webview_newsdatail_textsize:
ChangeWebViewTextSize();
break;
default:
break;
}

}

/************************* 改变网页字体功能 开始************************************/
private int mCurrentDialog=0;
private void ChangeWebViewTextSize() {

AlertDialog.Builder builder = new AlertDialog.Builder(this);
String[] items = new String[]{"超大号字体","大号字体","普通字体","小号字体","超小号字体"};

builder.setTitle("设置字体");

builder.setSingleChoiceItems(items,2, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
mCurrentDialog=which;

}
});
builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
WebSettings webview_Dialog_settings = mWebView.getSettings();

switch (mCurrentDialog) {
case 0:
webview_Dialog_settings.setTextSize(TextSize.LARGEST);
break;
case 1:
webview_Dialog_settings.setTextSize(TextSize.LARGER);
break;
case 2:
webview_Dialog_settings.setTextSize(TextSize.NORMAL);
break;
case 3:
webview_Dialog_settings.setTextSize(TextSize.SMALLER);
break;
case 4:
webview_Dialog_settings.setTextSize(TextSize.SMALLEST);
break;

default:
break;
}

}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.show();
}
/************************* 改变网页字体功能 结束************************************/
}