我正在制作一个phonegap项目。我在android中为它制作了一个原生插件。在其中，AsyncTask也被调用。在其中，我有context.startActivity(intent)功能。我希望在此活动完成后执行任务。我找到了一个使用context.startActivityForResult(intent,i)的解决方案。但是这个功能无法识别。
然后我试过了，
((Activity) context).startActivityForResult(intent,1);
按照
StartActivityForResult not working in AsyncTask
但是在startActivityForResult时，我遇到了文件安装错误。
我的代码如下 -
public class MyPlugin extends CordovaPlugin
{
Context context;
CallbackContext callback;
@Override
public void initialize(CordovaInterface cordova, CordovaWebView webView)
{
super.initialize(cordova, webView);
}
@Override
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException
{
context=this.cordova.getActivity().getApplicationContext();
callback=callbackContext;
if (action.equals("plugin1"))
{
System.out.println("Inside plugin1");
String myurl = args.getString(0);
if(haveNetworkConnection()==true)
{
System.out.println("Network connected");
new DownloadManager().execute(myurl);
return true;
}
else
{
System.out.println("Network not connected");
callbackContext.error("Internet connection is not available.");
return false;
}
}
callbackContext.error("Some error has occured.Please try later.");
return false;
}
public class DownloadManager extends AsyncTask<String, String, String>
{
@Override
public String doInBackground(String... arg0)
{
try
{
//Knowing imei number
TelephonyManager mngr = (TelephonyManager)context.getSystemService(context.TELEPHONY_SERVICE);
String imei_device=mngr.getDeviceId();
//downloading and installing app
downloadapk(arg0[0]);
installapk();
PluginResult result = new PluginResult(PluginResult.Status.OK, "success");
result.setKeepCallback(true);
callback.success("Operation completed!!");
return null;
}
catch(Exception e)
{
callback.error("Some problem occured.Try again later");
return null;
}
}
}
public void installapk()
{
try
{
Intent intent=new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(
Uri.fromFile(new File(Environment.getExternalStorageDirectory()+"/"+fileName)),"application/vnd.android.package-archive");
((Activity) context).startActivityForResult(intent,1);
}
catch (Exception e)
{
Log.e("File installing Error", e.getMessage());
System.out.println(e.getMessage());
callback.error("Installation Failed.Please try later");
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) //check if the request code is the one you've sent
{
if (resultCode == Activity.RESULT_OK)
{
System.out.println("Result is OK");
}
else
{
System.out.println("Result is not OK");
}
}
super.onActivityResult(requestCode, resultCode, data);
}
提前完成。
答案 0 :(得分：0)
请尝试这种方式，希望这有助于您解决问题。
public class MyPlugin extends CordovaPlugin {
Context context;
CallbackContext callback;
@Override
public void initialize(CordovaInterface cordova, CordovaWebView webView) {
super.initialize(cordova, webView);
}
@Override
public boolean execute(String action, JSONArray args, CallbackContext callbackContext) throws JSONException {
context = this.cordova.getActivity().getApplicationContext();
callback = callbackContext;
if (action.equals("plugin1")) {
System.out.println("Inside plugin1");
String myurl = args.getString(0);
if (haveNetworkConnection() == true) {
System.out.println("Network connected");
new DownloadManager().execute(myurl);
return true;
} else {
System.out.println("Network not connected");
callbackContext.error("Internet connection is not available.");
return false;
}
}
callbackContext.error("Some error has occured.Please try later.");
return false;
}
public class DownloadManager extends AsyncTask<String, String, String> {
@Override
public String doInBackground(String... arg0) {
try {
//Knowing imei number
TelephonyManager mngr = (TelephonyManager) context.getSystemService(context.TELEPHONY_SERVICE);
String imei_device = mngr.getDeviceId();
//downloading and installing app
downloadapk(arg0[0]);
PluginResult result = new PluginResult(PluginResult.Status.OK, "success");
result.setKeepCallback(true);
callback.success("Operation completed!!");
return null;
} catch (Exception e) {
callback.error("Some problem occured.Try again later");
return null;
}
}
@Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
installapk();
}
}
public void installapk() {
try {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setDataAndType(
Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/" + fileName)), "application/vnd.android.package-archive");
((Activity) context).startActivityForResult(intent, 1);
} catch (Exception e) {
Log.e("File installing Error", e.getMessage());
System.out.println(e.getMessage());
callback.error("Installation Failed.Please try later");
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 1) //check if the request code is the one you've sent
{
if (resultCode == Activity.RESULT_OK) {
System.out.println("Result is OK");
} else {
System.out.println("Result is not OK");
}
}
super.onActivityResult(requestCode, resultCode, data);
}
}
答案 1 :(得分：0)
错误是ClassCastException？
如果是这样，那是因为您要使用应用程序上下文替换Activity（Context），该应用程序上下文也是Context但不是Activity ，因此无法获得startActivityForResult方法。
如果你替换它是否有效：
context = this.cordova.getActivity().getApplicationContext();
with：
context = this.cordova.getActivity();
Here是关于不同类型的上下文以及何时使用每个上下文的解释。