Android Studio-Java-API

Question

我正在使用OkHttpClient連接到API。

Request request = new Request.Builder()
        .url(BPI_ENDPOINT)
        .build();

okHttpClient.newCall(request).enqueue(new Callback() {
    @Override
    public void onFailure(Call call, IOException e) {
        Toast.makeText(Test.this, "Error during BPI loading : "
                + e.getMessage(), Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onResponse(Call call, Response response)
            throws IOException {
       final String body = response.body().string();

       runOnUiThread(new Runnable() {
            @Override
            public void run() {
                parseBpiResponse(body);
            }
        });
    }
});

parseBpiResponse只是在TextView顯示數據，但是來自站點的數據請求僅發生一次，為了再次獲取數據，我需要重新激活活動或實現按鈕或滑動屏幕等，

如何不斷調用API請求，以使數據保持更新，而不是通過用戶輸入來進行？

Answer 1

您可以使用Timer類定期進行網絡調用

final long period = 0;
new Timer().schedule(new TimerTask() {
@Override
public void run() {
    // do your task here
}
}, 0, period);

Answer 2

使用此代碼，但您應注意此代碼中的活動和視圖，這會導致令人討厭的異常和內存泄漏，更好的方法是將實時數據與遞歸函數一起使用！

        new Thread(new Runnable() {
        @Override
        public void run() {

            //Checks the life cycle of the activity and if activity was destroyed break the while loop and exits 
            while (true && getLifecycle().getCurrentState() != Lifecycle.State.DESTROYED) {
                okHttpClient.newCall(request).enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {
                        Toast.makeText(Test.this, "Error during BPI loading : "
                                + e.getMessage(), Toast.LENGTH_SHORT).show();
                    }

                    @Override
                    public void onResponse(Call call, Response response)
                            throws IOException {
                        final String body = response.body().string();

                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                if (getLifecycle().getCurrentState() != Lifecycle.State.DESTROYED)
                                    parseBpiResponse(body);
                            }
                        });
                    }
                });

                try {
                    //Waits for 1 sec
                    TimeUnit.SECONDS.sleep(1);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

        }
    }).start();

Answer 3

只需進行遞歸調用即可，例如：

public void callAPI()
    {
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Toast.makeText(Test.this, "Error during BPI loading : "
                        + e.getMessage(), Toast.LENGTH_SHORT).show();
            }

            @Override
            public void onResponse(Call call, Response response)
                    throws IOException {
                final String body = response.body().string();

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        parseBpiResponse(body);
                    }
                });
         **//just use handler/timer or thread to post event after some interval**
                new android.os.Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        callAPI();
                    }
                },2000);
            }
        });

    }

我也建議將Rxjava+Retrofit與OkHttp使用，並使用interval函數使其變得更容易。