Android(安卓)- webview通过js调用Android方法

尊重原创：https://blog.csdn.net/nihaomabmt/article/details/80347945

H5调用APP的方法——APP来实现一些功能

1、通过下面的方法将webview的接口传给H5

@param object the Java object to inject into this WebView's JavaScript
* @param name the name used to expose the object in JavaScript
webview.addJavascriptInterface(Object object, String name));

在项目中

webview.addJavascriptInterface(new JsAction(), "action");

2、在JsAction类中添加相应的接口方法

android原生提供了一种注解方式@JavascriptInterface。只要在JsAction的类里面定义的方法都加上@JavascriptInterface即可。

private class JsAction {
@JavascriptInterface //H5调用Android的该方法
public void toast(final String jsonString) {
//注意@JavascriptInterface 下的该方法和当前activity并不是同一个线程，所以增加要将H5的调用和回调到H5的代码都写到runOnUiThread。否则会抛出以下异常
runOnUiThread(new Runnable() {
@Override
public void run() {
JSONObject object = null;
try {
object = new JSONObject(jsonString);
} catch (JSONException e) {
e.printStackTrace();
}
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("H5调用Android显示对话框");
if (object != null) {
builder.setMessage(object.optString("message", ""));
}
builder.setNegativeButton(android.R.string.ok, null);
AlertDialog dialog = builder.create();
dialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
@Override
public void onDismiss(DialogInterface dialog) {
//在dialog消息的时候，将修改H5的内容
reloadJs("alert", "iOS change javascript to message for H5");
}
});
dialog.show();
}
});
}
}

在H5调用的方法中添加如下代码即可

[javascript] view plain copy

//H5调用Android的方法来显示dialog
function toast(){
window.action.toast("{\"message\":\"From H5 message\"}");
}

@JavascriptInterface 下的该方法和当前activity并不是同一个线程，所以增加要将H5的调用和回调到H5的代码都写到runOnUiThread。否则会抛出以下异常

[java] view plain copy

05-17 16:11:00.847 13875-14010/com.j1 E/AndroidRuntime: FATAL EXCEPTION: JavaBridge
Process: com.j1, PID: 13875
java.lang.RuntimeException: java.lang.Throwable: A WebView method was called on thread 'JavaBridge'. All WebView methods must be called on the same thread. (Expected Looper Looper (main, tid 2) {839b89} called on Looper (JavaBridge, tid 349) {a0a3877}, FYI main Looper is Looper (main, tid 2) {839b89})
at android.webkit.WebView.checkThread(WebView.java:2486)
at android.webkit.WebView.loadUrl(WebView.java:938)
at com.j1.MainActivity.reloadJs(MainActivity.java:89)
at com.j1.MainActivity.access$100(MainActivity.java:18)
at com.j1.MainActivity$JsAction$1.onDismiss(MainActivity.java:76)
at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1361)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.os.HandlerThread.run(HandlerThread.java:65)
Caused by: java.lang.Throwable: A WebView method was called on thread 'JavaBridge'. All WebView methods must be called on the same thread. (Expected Looper Looper (main, tid 2) {839b89} called on Looper (JavaBridge, tid 349) {a0a3877}, FYI main Looper is Looper (main, tid 2) {839b89})
at android.webkit.WebView.checkThread(WebView.java:2476)
at android.webkit.WebView.loadUrl(WebView.java:938)
at com.j1.MainActivity.reloadJs(MainActivity.java:89)
at com.j1.MainActivity.access$100(MainActivity.java:18)
at com.j1.MainActivity$JsAction$1.onDismiss(MainActivity.java:76)
at android.app.Dialog$ListenersHandler.handleMessage(Dialog.java:1361)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.os.HandlerThread.run(HandlerThread.java:65)

1、通过下面的方法将webview的接口传给H5

2、在JsAction类中添加相应的接口方法

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