android只能通过webview 加载html吗
1个回答
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Android开发中可以用webview直接加载html文本，具体方法为：
1、首先在layout文件夹下的xml中 加入Java代码：
<WebView
android:id="@+id/wv1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
Java代码
public class jsWebDemo extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
WebView wView = (WebView)findViewById(R.id.wv1);
ProxyBridge pBridge = new ProxyBridge();
wView.addJavascriptInterface(pBridge, "AliansBridge");
WebSettings wSet = wView.getSettings();
wSet.setJavaScriptEnabled(true);
wView.loadUrl("file:///android_asset/index.html");
}
public class ProxyBridge {
public int one () {
return 1;
}
}
}
public class jsWebDemo extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
WebView wView = (WebView)findViewById(R.id.wv1);
ProxyBridge pBridge = new ProxyBridge();
wView.addJavascriptInterface(pBridge, "AliansBridge");
WebSettings wSet = wView.getSettings();
wSet.setJavaScriptEnabled(true);
wView.loadUrl("file:///android_asset/index.html");
}
public class ProxyBridge {
public int one () {
return 1;
}
}
}
解释：
wView.addJavascriptInterface(pBridge, "AliansBridge");
上句代码是实例化一个方法为的是在html中的js中调用，第二个参数则是 实例化方法的别名，如果要使用这个pBridge，则在js中使用的名字就是AliansBridge。
WebSettings wSet = wView.getSettings();
wSet.setJavaScriptEnabled(true);
上面两句就是允许使用js的意思
wView.loadUrl(file:///android_asset/index.html);
就是在asset下放入一个index.html文件，这个文件包含js的代码，注意路径是“///”，这个android_asset不是文件夹的名字是系统自动生成的，其实就是asset文件夹的系统路径。
index.html 内容如下：
Java代码
<html><body>
<div id="output">Test page.</div>
<input type="submit" value="change to 1" onclick="document.getElementById('output').innerHTML = AliansBridge.one()" />
</body></html>
<html><body>
<div id="output">Test page.</div>
<input type="submit" value="change to 1" onclick="document.getElementById('output').innerHTML = AliansBridge.one()" />
</body></html>
2.上面是javascript调用android的方法，那么android也可以调用js的方法：
Java代码
public class webJsDemo extends Activity {
/** Called when the activity is first created. */
private WebView mWebView;
private Handler mHandler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mWebView = (WebView) findViewById(R.id.wv1);
WebSettings webSettings = mWebView.getSettings();
webSettings.setSavePassword(false);
webSettings.setSaveFormData(false);
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportZoom(false);
mWebView.setWebChromeClient(new MyWebChromeClient());
mWebView.addJavascriptInterface(new DemoJavaScriptInterface(), "demo");
mWebView.loadUrl("file:///android_asset/demo.html");
}
final class DemoJavaScriptInterface {
DemoJavaScriptInterface() {
}
/**
* This is not called on the UI thread. Post a runnable to invoke
* loadUrl on the UI thread.
*/
public void clickOnAndroid() {
mHandler.post(new Runnable() {
public void run() {
mWebView.loadUrl("javascript:wave()");
}
});
}
}
/**
* Provides a hook for calling "alert" from javascript. Useful for
* debugging your javascript.
*/
final class MyWebChromeClient extends WebChromeClient {
@Override
public boolean onJsAlert(WebView view, String url, String message,
JsResult result) {
// TODO Auto-generated method stub
Log.d("aa", message);
Log.d("url", url);
Log.d("result", ""+result);
result.confirm();
return super.onJsAlert(view, url, message, result);
}
}
public class webJsDemo extends Activity {
/** Called when the activity is first created. */
private WebView mWebView;
private Handler mHandler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mWebView = (WebView) findViewById(R.id.wv1);
WebSettings webSettings = mWebView.getSettings();
webSettings.setSavePassword(false);
webSettings.setSaveFormData(false);
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportZoom(false);
mWebView.setWebChromeClient(new MyWebChromeClient());
mWebView.addJavascriptInterface(new DemoJavaScriptInterface(), "demo");
mWebView.loadUrl("file:///android_asset/demo.html");
}
final class DemoJavaScriptInterface {
DemoJavaScriptInterface() {
}
/**
* This is not called on the UI thread. Post a runnable to invoke
* loadUrl on the UI thread.
*/
public void clickOnAndroid() {
mHandler.post(new Runnable() {
public void run() {
mWebView.loadUrl("javascript:wave()");
}
});
}
}
/**
* Provides a hook for calling "alert" from javascript. Useful for
* debugging your javascript.
*/
final class MyWebChromeClient extends WebChromeClient {
@Override
public boolean onJsAlert(WebView view, String url, String message,
JsResult result) {
// TODO Auto-generated method stub
Log.d("aa", message);
Log.d("url", url);
Log.d("result", ""+result);
result.confirm();
return super.onJsAlert(view, url, message, result);
}
其中上面的代码 也提到了怎么在android中调试js mWebView.setWebChromeClient(new MyWebChromeClient());
上面的代码来源于别人的实例。
3、还要注意在这个实例中demo.html和两个image应该在同一个文件夹asset下
1、首先在layout文件夹下的xml中 加入Java代码：
<WebView
android:id="@+id/wv1"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
Java代码
public class jsWebDemo extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
WebView wView = (WebView)findViewById(R.id.wv1);
ProxyBridge pBridge = new ProxyBridge();
wView.addJavascriptInterface(pBridge, "AliansBridge");
WebSettings wSet = wView.getSettings();
wSet.setJavaScriptEnabled(true);
wView.loadUrl("file:///android_asset/index.html");
}
public class ProxyBridge {
public int one () {
return 1;
}
}
}
public class jsWebDemo extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
WebView wView = (WebView)findViewById(R.id.wv1);
ProxyBridge pBridge = new ProxyBridge();
wView.addJavascriptInterface(pBridge, "AliansBridge");
WebSettings wSet = wView.getSettings();
wSet.setJavaScriptEnabled(true);
wView.loadUrl("file:///android_asset/index.html");
}
public class ProxyBridge {
public int one () {
return 1;
}
}
}
解释：
wView.addJavascriptInterface(pBridge, "AliansBridge");
上句代码是实例化一个方法为的是在html中的js中调用，第二个参数则是 实例化方法的别名，如果要使用这个pBridge，则在js中使用的名字就是AliansBridge。
WebSettings wSet = wView.getSettings();
wSet.setJavaScriptEnabled(true);
上面两句就是允许使用js的意思
wView.loadUrl(file:///android_asset/index.html);
就是在asset下放入一个index.html文件，这个文件包含js的代码，注意路径是“///”，这个android_asset不是文件夹的名字是系统自动生成的，其实就是asset文件夹的系统路径。
index.html 内容如下：
Java代码
<html><body>
<div id="output">Test page.</div>
<input type="submit" value="change to 1" onclick="document.getElementById('output').innerHTML = AliansBridge.one()" />
</body></html>
<html><body>
<div id="output">Test page.</div>
<input type="submit" value="change to 1" onclick="document.getElementById('output').innerHTML = AliansBridge.one()" />
</body></html>
2.上面是javascript调用android的方法，那么android也可以调用js的方法：
Java代码
public class webJsDemo extends Activity {
/** Called when the activity is first created. */
private WebView mWebView;
private Handler mHandler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mWebView = (WebView) findViewById(R.id.wv1);
WebSettings webSettings = mWebView.getSettings();
webSettings.setSavePassword(false);
webSettings.setSaveFormData(false);
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportZoom(false);
mWebView.setWebChromeClient(new MyWebChromeClient());
mWebView.addJavascriptInterface(new DemoJavaScriptInterface(), "demo");
mWebView.loadUrl("file:///android_asset/demo.html");
}
final class DemoJavaScriptInterface {
DemoJavaScriptInterface() {
}
/**
* This is not called on the UI thread. Post a runnable to invoke
* loadUrl on the UI thread.
*/
public void clickOnAndroid() {
mHandler.post(new Runnable() {
public void run() {
mWebView.loadUrl("javascript:wave()");
}
});
}
}
/**
* Provides a hook for calling "alert" from javascript. Useful for
* debugging your javascript.
*/
final class MyWebChromeClient extends WebChromeClient {
@Override
public boolean onJsAlert(WebView view, String url, String message,
JsResult result) {
// TODO Auto-generated method stub
Log.d("aa", message);
Log.d("url", url);
Log.d("result", ""+result);
result.confirm();
return super.onJsAlert(view, url, message, result);
}
}
public class webJsDemo extends Activity {
/** Called when the activity is first created. */
private WebView mWebView;
private Handler mHandler = new Handler();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mWebView = (WebView) findViewById(R.id.wv1);
WebSettings webSettings = mWebView.getSettings();
webSettings.setSavePassword(false);
webSettings.setSaveFormData(false);
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportZoom(false);
mWebView.setWebChromeClient(new MyWebChromeClient());
mWebView.addJavascriptInterface(new DemoJavaScriptInterface(), "demo");
mWebView.loadUrl("file:///android_asset/demo.html");
}
final class DemoJavaScriptInterface {
DemoJavaScriptInterface() {
}
/**
* This is not called on the UI thread. Post a runnable to invoke
* loadUrl on the UI thread.
*/
public void clickOnAndroid() {
mHandler.post(new Runnable() {
public void run() {
mWebView.loadUrl("javascript:wave()");
}
});
}
}
/**
* Provides a hook for calling "alert" from javascript. Useful for
* debugging your javascript.
*/
final class MyWebChromeClient extends WebChromeClient {
@Override
public boolean onJsAlert(WebView view, String url, String message,
JsResult result) {
// TODO Auto-generated method stub
Log.d("aa", message);
Log.d("url", url);
Log.d("result", ""+result);
result.confirm();
return super.onJsAlert(view, url, message, result);
}
其中上面的代码 也提到了怎么在android中调试js mWebView.setWebChromeClient(new MyWebChromeClient());
上面的代码来源于别人的实例。
3、还要注意在这个实例中demo.html和两个image应该在同一个文件夹asset下
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