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WebView相关

2016-01-27 09:17 309 查看

WebView相关

WebView的后退

方式一

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {
if (mWebView.canGoBack()) {
mWebView.goBack();
} else {
finish();
}
return true;
}
return super.onKeyDown(keyCode, event);
}

方式二

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && webview.canGoBack()) {
webview.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}

使用intent跳转到指定网页

Uri uri = Uri.parse("http://www.sohu.com");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
startActivity(intent);

webview浏览器url输入栏

btn_search.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String url = et_text.getText().toString();

if (url == null || "".equals(url)) {
Toast.makeText(getApplicationContext(), "请输入", Toast.LENGTH_SHORT).show();
} else {
if (!url.startsWith("http:") && !url.endsWith("file:")) {
url = "http://" + url;
}
}
webview.loadUrl(url);
}
});

WebSettings设置

settings = mWebView.getSettings();
settings.setJavaScriptEnabled(true); // 启用javascript脚本
settings.setBuiltInZoomControls(true); // 启用界面上放大和缩小按钮
settings.setUseWideViewPort(true); // 启用双击放大, 双击缩小功能
mWebView.loadUrl(url);

webSettings.setCacheMode(webSettings.LOAD_CACHE_ELSE_NETWORK);// 优先使用缓存
webSettings.setCacheMode(webSettings.LOAD_NO_CACHE);//不使用缓存
webview.setHapticFeedbackEnabled(false); // 触觉回馈不可用
mWebSettings.setSupportZoom(true); // 支持缩放
webview.getSettings().setSavePassword(false); // 设置是否保存密码

webview加载资源

// webview加载本地资源
webview.loadUrl("file:///android_asset/demo.html");

// 加载web资源
webview.loadUrl("http://baidu.com");

// 这种方式可以解决中文乱码问题
String htmlContent="<html><head></head><body>少量内容，直接用字符串拼接</body></html>";
webview.loadDataWithBaseURL(null, htmlContent, "text/html", "utf-8", null);

WebViewClient

使用webview打开网页

webview.setWebViewClient(new WebViewClient() {
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);

// 返回true用WebView打开，false调用系统浏览器或第三方浏览器
return true;
}
});

加载网页完成后,进度条消失

mWebView.setWebViewClient(new WebViewClient() {
@Override
public void onPageFinished(WebView view, String url) {
mProgressbar.setVisibility(View.GONE);
}
});

总结

class MyWebViewClient extends WebViewClient {
//设置使用webview打开网页
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}

// 开始加载网页时要做的工作
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
super.onPageStarted(view, url, favicon);
}

// 加载完成时要做的工作
@Override
public void onPageFinished(WebView view, String url) {
super.onPageFinished(view, url);
}

// 加载错误时要做的工作
@Override
public void onReceivedError(WebView view, int errorCode,
String description, String failingUrl) {
Log.d("onReceivedError", "error=" + description);
Toast.makeText(MainActivity.this, errorCode + "/" + description,
Toast.LENGTH_LONG).show();
}

}

WebChromeClient

class MyWebChromeClient extends WebChromeClient {

// 对话框
@Override
public boolean onJsAlert(WebView view, String url, String message, final JsResult result) {
Builder builder = new Builder(MainActivity.this);
builder.setTitle("提示对话框");
builder.setMessage("message");
builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
result.confirm();
}
});
builder.setCancelable(false);
builder.create();
builder.show();
return true;
}

// 带按钮的对话框
@Override
public boolean onJsConfirm(WebView view, String url, String message, final JsResult result) {
Builder builder = new Builder(MainActivity.this);
builder.setTitle("带选择的对话框");
builder.setMessage(message);
builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
result.confirm();
}
});
builder.setNeutralButton(android.R.string.cancel, new AlertDialog.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
result.cancel();
}
});
builder.setCancelable(false);
builder.create();
builder.show();
return true;
}

// 带输入框的对话框
@Override
public boolean onJsPrompt(WebView view, String url, String message, String defaultValue,
final JsPromptResult result) {

LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
final View v = inflater.inflate(R.layout.prom_dialog, null);

// 设置 TextView对应网页中的提示信息
TextView TextView_PROM = (TextView) v.findViewById(R.id.TextView_PROM);
TextView_PROM.setText(message);
// 设置EditText对应网页中的输入框
EditText EditText_PROM = (EditText) v.findViewById(R.id.EditText_PROM);
EditText_PROM.setText(defaultValue);

Builder builder = new Builder(MainActivity.this);
builder.setTitle("带输入的对话框");
builder.setView(v);
builder.setPositiveButton(android.R.string.ok, new AlertDialog.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String value = ((EditText) v.findViewById(R.id.EditText_PROM)).getText().toString();
result.confirm(value);
}
});
builder.setNegativeButton(android.R.string.cancel, new AlertDialog.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
result.cancel();
}
});
builder.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
result.cancel();
}
});
builder.create();
builder.show();
return true;
}

// 设置网页加载的进度条
@Override
public void onProgressChanged(WebView view, int newProgress) {
MainActivity.this.getWindow().setFeatureInt(Window.FEATURE_PROGRESS, newProgress * 100);
super.onProgressChanged(view, newProgress);
}

// 设置应用程序的标题
@Override
public void onReceivedTitle(WebView view, String title) {
MainActivity.this.setTitle(title);
super.onReceivedTitle(view, title);
}

}

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