Android WebView实现长截图
Android网页长截图功能实现
在安卓开发过程中，有时候会需要进行长截图，而传统截图都是单张截图，若我们想获取整个网页的内容做长截图该怎么做呢？
1.首先我们可以先处理一下链接
// 打开网页
String content = mContentEdit.getText().toString();
if (TextUtils.isEmpty(content)) {
ToastUtils.showShortToast("请输入或粘贴网址");
return;
}
if (!content.contains("http://") && !content.contains("https://")) {
content ="http://" + content;
}
if (content.contains(" ")) {
// 淘宝链接转正确网址
String host ="http://";
if (content.contains("https://")) {
host ="https://";
}
String s = content.substring(content.indexOf(host));
if (s.contains(" ")) {
s = s.substring(0, s.indexOf(" "));
content = s;
}
}
// 校验网址是否有效
if (!Patterns.WEB_URL.matcher(content).matches()) {
ToastUtils.showShortToast("请输入或粘贴有效网址");
return;
}
Intent intent =new Intent(this, WebScreenShotActivity.class);
intent.putExtra("url", content);
startActivity(intent);
2.WebView页面展示网页
WebSettings webSettings = mWebView.getSettings();
webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN);
webSettings.setDefaultTextEncodingName("UTF-8");
webSettings.setJavaScriptEnabled(true);
webSettings.setUserAgentString(webSettings.getUserAgentString());
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
webSettings.setSupportZoom(true);
webSettings.setUseWideViewPort(true);
webSettings.setBuiltInZoomControls(true);
webSettings.setLoadWithOverviewMode(true);
webSettings.setRenderPriority(WebSettings.RenderPriority.HIGH);
webSettings.setLoadsImagesAutomatically(true);
webSettings.setDomStorageEnabled(true);
webSettings.setDatabaseEnabled(true);
webSettings.setAppCacheEnabled(true);
mWebView.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
return false;
}
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
if(!mWebView.getSettings().getLoadsImagesAutomatically()) {
mWebView.getSettings().setLoadsImagesAutomatically(true);
}
}
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
});
mWebView.loadUrl(getIntent().getStringExtra("url"));
3.实现长截图功能
注意：该方法在Android4.4以下可以截取整个WebView的内容，但是在4.4以上，需要在WebView未加载之前，也就是setContentView之前，增加以下代码，才能截取整个WebView的内容。
if (Build.VERSION.SDK_INT > 19) {
mWebView.enableSlowWholeDocumentDraw();
}
下面就是长截图功能实现部分：
Picture snapShot = mWebView.capturePicture();
if (snapShot == null || snapShot.getHeight() <= 0 || snapShot.getWidth() <= 0) return;
Bitmap bitmap = Bitmap.createBitmap(snapShot.getWidth(),
snapShot.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
snapShot.draw(canvas);
4.保存到本地相册，并刷新
try {
String fileName = Environment.getExternalStorageDirectory().getPath()+"/temp_capture.jpg";
FileOutputStream fos = new FileOutputStream(fileName);
//压缩bitmap到输出流中
bitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos);
fos.close();
Toast.makeText(WebviewFromGetDecorView.this, "截屏成功", Toast.LENGTH_LONG).show();
File file = new File(fileName);
insertToSystem(mActivity, file, fileName);
} catch (Exception e) {
Log.e(TAG, e.getMessage());
} finally {
if(bitmap != null) {
bitmap.recycle();
}
}
刷新媒体库方法
public void insertToSystem(Context context, File file, String fileName) {
try {
MediaStore.Images.Media.insertImage(context.getContentResolver(),
file.getAbsolutePath(), fileName, null);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// 通知图库更新
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
// 判断SDK版本是不是4.4或者高于4.4
String[] paths = new String[]{
file.getAbsolutePath()};
MediaScannerConnection.scanFile(context, paths, null, null);
} else {
final Intent intent;
if (file.isDirectory()) {
intent = new Intent(Intent.ACTION_MEDIA_MOUNTED);
intent.setClassName("com.android.providers.media",
"com.android.providers.media.MediaScannerReceiver");
intent.setData(Uri.fromFile(Environment.getExternalStorageDirectory()));
} else {
intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
intent.setData(Uri.fromFile(file));
}
context.sendBroadcast(intent);
}
}