我有一个android活动,在活动加载时执行异步 Okhttp 调用(从onStart
方法调用getActiveRequests())。
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
Button btLogout;
UserLocalStore userLocalStore;
String username;
String userEmail;
String recentAppName;
String recentRequestTime;
String isExpired;
TelephonyManager telephonyManager;
OkHttpClient client;
TextView tvRecentAppName, tvRecentRequestTime, tvIsExpired;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
userLocalStore = new UserLocalStore(this);
telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
TextView tvUserName = (TextView) findViewById(R.id.userName);
TextView tvUserEmail = (TextView) findViewById(R.id.userEmail);
tvRecentAppName = (TextView) findViewById(R.id.recentAppName);
tvRecentRequestTime = (TextView) findViewById(R.id.recentRequestTime);
tvIsExpired = (TextView) findViewById(R.id.isExpired);
client = new OkHttpClient();
username = userLocalStore.getLoggedInUser().name;
userEmail = userLocalStore.getLoggedInUser().email;
tvUserEmail.setText(userEmail);
tvUserName.setText(username);
btLogout = (Button) findViewById(R.id.btLogout);
btLogout.setOnClickListener(this);
}
@Override
protected void onStart() {
super.onStart();
if(authenticateUser() == true){
getActiveRequests();
}else{
startActivity(new Intent(this, LoginActivity.class));
}
}
我想要做的是使用SetText
方法进行Http调用后更新UI。这是我的调用,在GetActiveRequests()方法中实现。
client.newCall(request)
.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
String hello = "failed call";
}
@Override
public void onResponse(Call call, Response response) throws IOException {
final String responseData = response.body().string();
if (responseData != null) {
Gson gson = new Gson();
JsonElement element = gson.fromJson(responseData, JsonElement.class);
JsonObject jsonObject = element.getAsJsonObject();
final AccessRequest request = gson.fromJson(jsonObject, AccessRequest.class);
recentAppName = request.AppName.toString();
recentRequestTime = request.RequestTime.toString();
if (request.IsExpired)
isExpired = "Has Expired";
else isExpired = "Active";
tvRecentAppName.setText(recentAppName);
tvRecentRequestTime.setText(recentRequestTime);
tvIsExpired.setText(isExpired);
}
}
});
我遇到的问题是,当调试器到达SetText
行代码时,它会导致应用程序崩溃并关闭。我对如何解决这个问题感到很遗憾,但我认为它与Okhttp Async
调用无法更新UI有关,因为我的setText方法在onCreate()
中工作正常。 / p>
答案 0 :(得分:2)
那是因为观点'更新只能在UI线程上完成,而OkHttp的onResponse
在后台线程上运行。尝试在主线程上运行,如下所示:
@Override
public void onResponse(Call call, Response response) throws IOException {
final String responseData = response.body().string();
if (responseData != null) {
Gson gson = new Gson();
JsonElement element = gson.fromJson(responseData, JsonElement.class);
JsonObject jsonObject = element.getAsJsonObject();
final AccessRequest request = gson.fromJson(jsonObject, AccessRequest.class);
recentAppName = request.AppName.toString();
recentRequestTime = request.RequestTime.toString();
if (request.IsExpired)
isExpired = "Has Expired";
else isExpired = "Active";
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
//Handle UI here
tvRecentAppName.setText(recentAppName);
tvRecentRequestTime.setText(recentRequestTime);
tvIsExpired.setText(isExpired);
}
});
}
}
同样,如果您更新onFailure
上的任何视图,请在UI线程上执行。