android - OkHTTP 从排队回调更新 UI

Question

我正在尝试使用 OkHTTP 库。调用服务器并获得成功响应时。我需要更新 UI。

在使用 enqueue() 进行异步调用时如何做到这一点？

client.newCall(request).enqueue(new Callback() {

    @Override
    public void onFailure(Request request, IOException e) {

    }

    @Override
    public void onResponse(Response response) throws IOException {

        if (response.isSuccessful()) {

            // NEED TO UPDATE UI HERE

        } 
    }
});

Answer 1

您可以引用下面的示例代码，希望对您有所帮助!

public class MainActivity extends AppCompatActivity {
    private static final String LOG_TAG = "OkHttp";
    private TextView mTextView;
    private Handler mHandler;
    private String mMessage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTextView = (TextView) findViewById(R.id.textView);
        mHandler = new Handler(Looper.getMainLooper());
        OkHttpClient client = new OkHttpClient();
        // GET request
        Request request = new Request.Builder()
                .url("http://...")
                .build();
        client.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Request request, IOException e) {
                mMessage = e.toString();
                Log.e(LOG_TAG, mMessage); // no need inside run()
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        mTextView.setText(mMessage); // must be inside run()
                    }
                });
            }

            @Override
            public void onResponse(Response response) throws IOException {
                mMessage = response.toString();
                Log.i(LOG_TAG, mMessage); // no need inside run()
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        mTextView.setText(mMessage); // must be inside run()
                    }
                });
            }
        });
    }
}