好的,我正在尝试实现一个电话间隙插件,它由两部分组成。我正在使用cordova 2.0.0 和eclipse。
这是java部分:
package org.apache.cordova;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.cordova.api.Plugin;
import org.apache.cordova.api.PluginResult;
import org.json.JSONArray;
import android.graphics.Bitmap;
import android.os.Environment;
import android.view.View;
public class Screenshot extends Plugin {
@Override
public PluginResult execute(String action, JSONArray args, String callbackId) {
// starting on ICS, some WebView methods
// can only be called on UI threads
final Plugin that = this;
final String id = callbackId;
super.cordova.getActivity().runOnUiThread(new Runnable() {
//@Override
public void run() {
View view = webView.getRootView();
view.setDrawingCacheEnabled(true);
Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
try {
File folder = new File(Environment.getExternalStorageDirectory(), "Pictures");
if (!folder.exists()) {
folder.mkdirs();
}
File f = new File(folder, "screenshot_" + System.currentTimeMillis() + ".png");
FileOutputStream fos = new FileOutputStream(f);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
that.success(new PluginResult(PluginResult.Status.OK), id);
} catch (IOException e) {
that.success(new PluginResult(PluginResult.Status.IO_EXCEPTION, e.getMessage()), id);
}
}
});
PluginResult result = new PluginResult(PluginResult.Status.NO_RESULT);
result.setKeepCallback(true);
return result;
}
}
这是javascript部分:
cordova.define("cordova/plugin/screenshot", function(require, exports, module) {
var exec = require('cordova/exec');
/**
* This class exposes the ability to take a Screenshot to JavaScript
*/
var Screenshot = function() {};
/**
* Save the screenshot to the user's Photo Library
*/
Screenshot.prototype.saveScreenshot = function() {
exec(null, null, "Screenshot", "saveScreenshot", []);
};
var screenshot = new Screenshot();
module.exports = screenshot;
});
if (!window.plugins) {
window.plugins = {};
}
if (!window.plugins.screenshot) {
window.plugins.screenshot = cordova.require("cordova/plugin/screenshot");
}
我试图在另一个页面上用另一个 javascript 函数调用它,但没有成功。我将图像的锚点隐藏在画布上,然后是这一行:
setTimeout(takeScreenShot,500);
编辑——在西蒙麦克唐纳的回答之后做出的,这与一个javascript函数有关:
function takeScreenShot() {
window.plugins.screenshot.saveScreenshot();
}
以下 java 打印:
System.out.println(folder);
System.out.println("screenshot_" + System.currentTimeMillis() + ".png");
产生以下结果:
/mdt/sdcard/Pictures
screenshot_1347893081276.png
编辑关闭并再次打开设备后,我拍摄的屏幕截图出现了,手机似乎缓存了它们,并没有实际将它们存储到所选文件夹中。
我已确保我的 config.xml 和我的 android 清单具有正确的权限和代码行。有人看到我哪里出错了吗?