在OkHttp的Android SetText导致崩溃的异步回调
我有一个android活动,执行异步okhttp调用时,活动加载(从onStart
方法调用为getActiveRequests())。在OkHttp的Android SetText导致崩溃的异步回调
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));
}
}
我想要做的就是更新一次HTTP调用已使用SetText
方法所做的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,它会导致应用崩溃和关闭。我不知道如何解决这个问题,但我认为它与Okhttp Async
调用不能更新UI有关,因为我的setText方法在onCreate()
中工作正常。
这是因为视图的更新只能在UI线程上完成,OkHttp的onResponse
在后台线程上运行。尝试在主线程上运行,像这样:
@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,如果你有更新onFailure
任何意见,这样做的UI线程。
谢谢你,这是为我工作:) – jjharrison
@jjharrison,太棒了! –
这可能是因为结果为空,并且您无法将空值设置为视图 – Eenvincible
请参阅Jake Whartons在这里的答案http://*.com/questions/24246783/okhttp-response-callbacks-on-the-主线程 –
检查我的[答案](http://*.com/questions/36629346/android-settext-in-okhttp-async-callback-causing-crash/36629456#36629456)并尝试更新UI线程上的视图。 –