Question

嗨这是循环我怎么能在我输入的地方打破它我想在这里打破它在此先感谢您的帮助，我使用android studio开发我的应用程序。

for (int i = 10; i < 100; i++) {
        if (serverconnection.equals("false")) {
            AsyncHttpPost post = new AsyncHttpPost(serveraddress + "/soton/serveraddress.php");
            post.setTimeout(5000);

            final int finalI = i;
            AsyncHttpClient.getDefaultInstance().executeString(post, new AsyncHttpClient.StringCallback() {
                @Override
                public void onCompleted(final Exception e, AsyncHttpResponse source, final String result) {

                    if (e != null) {
                        MainActivity.activity.runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                e.printStackTrace();
                                servernum = finalI+1;
                                Toast.makeText(MainActivity.activity, "not this IP:"+ servernum, Toast.LENGTH_SHORT).show();

                            }
                        });
                    } else if (result.equals("correct address")) {
                        MainActivity.activity.runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(MainActivity.activity,"آدرس جدید پیدا شد",Toast.LENGTH_LONG).show();
                                serverconnection = "true";
                                SharedPreferences.Editor editor = sp.edit();
                                editor.putString("IP", serveraddress+"/");
                                editor.apply();
                                I WHANT TO BREAK IT HERE



                            }
                        });
                    }
                }
            });
        } else {


            SharedPreferences.Editor editori = sp.edit();
            editori.putString("IP", serveraddress+"/");
            editori.apply();
        }
    }

Answer 1

只需使用

else if (result.equals("correct address")) {
                        MainActivity.activity.runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                Toast.makeText(MainActivity.activity,"آدرس جدید پیدا شد",Toast.LENGTH_LONG).show();
                                serverconnection = "true";
                                SharedPreferences.Editor editor = sp.edit();
                                editor.putString("IP", serveraddress+"/");
                                editor.apply();


                         //use break

                         break;

                            }
                        });

打破循环。

IF语句中的break命令将退出FOR循环

Answer 2

在for循环之前使用全局布尔（AtomicBoolean）变量，例如。 shouldStop。最初将其值设置为false。并且在进入循环时检查该值是否为真。如果真的使用了。或者只是在for语句中使用它作为条件。现在设置shouldStop = true代替我在这里打破

//initialize AtomicBoolean shouldStop = new AtomicBoolean(Boolean.FALSE); //update value shouldStop.set(Boolean.TRUE);

Answer 3

试试这段代码：

/**
 * Try to connect to the server, with an ip address from 'minIndex' to 'maxIndex';
 * @param context Current Context
 * @param minIndex Index of the ip address to start with. (e.g. 10)
 * @param maxIndex max index
 */
public void testIpConnection(Context context,final int minIndex, final int maxIndex) {
    testConnection(minIndex, new Callback() {
        @Override
        public void onSuccess(String serverAddress) {
            Toast.makeText(context, "آدرس جدید پیدا شد", Toast.LENGTH_LONG).show();
            storeServerAddress(serverAddress);
        }

        @Override
        public void onFailure(int index, @Nullable Throwable e) {
            if (e != null)
                e.printStackTrace();
            Toast.makeText(context, "not this IP:" + index, Toast.LENGTH_SHORT).show();
            index++;
            if (index < maxIndex)
                // Try again with the same callback and the new index
                testConnection(index, this);
            else
                Toast.makeText(context, "Failure: Max IP reached" , Toast.LENGTH_SHORT).show();   
        }
    });
}

/**
 * Connect to the server
 *
 * @param index    index to generate the ip
 * @param callback To be call when the request returns.
 */
public void testConnection(final int index, final Callback callback) {
    final String serverAddress = ...; // TODO: Use the index to generate the serverAddress
    AsyncHttpPost post = new AsyncHttpPost(serverAddress + "/soton/serveraddress.php");
    post.setTimeout(5000);

    AsyncHttpClient.getDefaultInstance().executeString(post, new AsyncHttpClient.StringCallback() {
        @Override
        public void onCompleted(final Exception e, AsyncHttpResponse source, final String result) {
            if (result != null && result.equals("correct address")) {
                callback.onSuccess(serverAddress);
            } else {
                callback.onFailure(index, e);
            }
        }
    });
}

/**
 * Store the server address in the SharedPreferences
 *
 * @param serverAddress Address to store
 */
public void storeServerAddress(String serverAddress) {
    SharedPreferences sp = ... // TODO: Define sp here
    SharedPreferences.Editor editori = sp.edit();
    editori.putString("IP", serverAddress + "/");
    editori.apply();
}

/**
 * To be call when on a result of a server call
 */
private interface Callback {
    void onSuccess(String serverAddress);

    void onFailure(int index, Throwable e);
}

我怎么能在android studio中打破这个循环

3 个答案: