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[英]Android: How do I get the Application Context as an Activity from a class that extends Application?
[英]Crosswalk - How do you get android application context in the XWalkExtension class?
因此,我正在按照https://crosswalk-project.org/documentation/embedding_crosswalk/extensions.html上创建Crosswalk扩展的说明进行操作。 我的问题与扩展XWalkExtension类有关。
package org.crosswalkproject.sample;
import org.xwalk.core.XWalkExtension;
public class ExtensionEcho extends XWalkExtension {
private static String name = "echo";
private static String jsapi = "var echoListener = null;" +
"extension.setMessageListener(function(msg) {" +
" if (echoListener instanceof Function) {" +
" echoListener(msg);" + " };" + "});" +
"exports.echo = function (msg, callback) {" +
" echoListener = callback;" + " extension.postMessage(msg);" +
"};" + "exports.echoSync = function (msg) {" +
" return extension.internal.sendSyncMessage(msg);" + "};";
public ExtensionEcho() {
super(name, jsapi);
}
@Override
public void onMessage(int instanceID, String message) {
postMessage(instanceID, "From java: " + message);
}
@Override
public String onSyncMessage(int instanceID, String message) {
return "From java sync: " + message;
}
}
扩展XWalkExtension类时,如何获取android应用程序上下文? 因此,如果我想创建Toast消息,则可以在上下文中传递。
没有公开记录的接口可从XWalkExtension获取活动。 您可以修改构造函数以存储对Activity的私有引用,然后只需从实例化扩展的地方将其传递即可。
public class ExtensionEcho extends XWalkExtension {
private final Activity activity;
public ExtensionEcho(Activity activity) {
this.activity = activity;
}
...
}
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