在内部类局部变量的最终的ACCES破 [英] acces of local final variable in inner class broken
问题描述
我在哪一个服务器 - 客户端通信完成的onClick为此我创建一个匿名OnClickListener的方法,我要发布一个敬酒通信是否全成与否。
要做到这一点,我需要的活性的研究中,上下文发布敬酒,和我的外在的方法,它必须被赋予为这个参数的活动。但是作为我是一个匿名内部类中我无法访问活性的研究的这个指针,即使我把它存储在一个局部变量的最终
I got a method in which server-client communication is done "onClick" therefor i create a anonymous OnClickListener, and I want to publish a toast if the communication was successfull or not. To do this I need the Acitivity in which context to publish the toast, and as I externalized the method, it must be given as a "this" argument to the Activity. But as I am inside an anonymous inner class I cannot access the this pointer of the Acitivity, and even though I stored it in a local final variable
private final Activity activity = this;
@Override
public void onCreate(Bundle savedInstanceState) {
lastResult = null;
super.onCreate(savedInstanceState);
setLayout(R.layout.main);
qrscan = (Button) findViewById(R.id.qrcodescan);
qrscan.setOnClickListener( new View.OnClickListener() {
public void onClick(View view) {
initiateScan(activity);
}
}
);
}
private AlertDialog initiateSend(Activity activity) {
if(lastResult != null) {
String[] arr = lastResult.content.split("/");
AlertDialog.Builder downloadDialog = new AlertDialog.Builder(activity);
String[] args = Util.filterString(arr,this);
downloadDialog.setTitle(args[0]);
downloadDialog.setMessage("Auftragsnummer:" + args[1]);
downloadDialog.setPositiveButton(getString(R.string.ja), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
try {
String send = lastResult.content;
send += "/uid/" + R.id.username + "/cid/" + R.id.password;
String result = Util.send(send);
//toaster(send);
Util.toaster(result,activity);
if(!(result.equals("OK") || result.equals("ok") || result.equals("Ok")))
throw new Exception("Bad Server Answer");
Util.toaster("Communication erfolgreich",activity);
} catch(Exception ex) {
ex.printStackTrace();
Util.toaster("Communication nicht erfolgreich",activity);
}
}
});
downloadDialog.setNegativeButton(getString(R.string.nein), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {}
});
return downloadDialog.show();
}
return null;
}
任何线索什么我搞砸了?
Any clue what i messed up?
推荐答案
在声明变量的的onCreate()像这样
public class HelloAndroid extends Activity {
Activity activity = this; // declare here
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
EDITED
Activity mainActivity;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setLayout(R.layout.main);
mainActivity = this;
lastResult = null;
qrscan = (Button) findViewById(R.id.qrcodescan);
qrscan.setOnClickListener( new View.OnClickListener() {
public void onClick(View view) {
initiateScan(mainActivity);
}
}
);
}
private AlertDialog initiateSend(final Activity activity) {
if(lastResult != null) {
String[] arr = lastResult.content.split("/");
AlertDialog.Builder downloadDialog = new AlertDialog.Builder(activity);
String[] args = Util.filterString(arr,this);
downloadDialog.setTitle(args[0]);
downloadDialog.setMessage("Auftragsnummer:" + args[1]);
downloadDialog.setPositiveButton(getString(R.string.ja), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
try {
String send = lastResult.content;
send += "/uid/" + R.id.username + "/cid/" + R.id.password;
String result = Util.send(send);
//toaster(send);
Util.toaster(result,activity);
if(!(result.equals("OK") || result.equals("ok") || result.equals("Ok")))
throw new Exception("Bad Server Answer");
Util.toaster("Communication erfolgreich",activity);
} catch(Exception ex) {
ex.printStackTrace();
Util.toaster("Communication nicht erfolgreich",activity);
}
}
});
downloadDialog.setNegativeButton(getString(R.string.nein), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1) {}
});
return downloadDialog.show();
}
return null;
}
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