我有一个名为getData()的方法，它在启动活动的早期加载；它基本上连接到json并从中检索一些字符串。
我有两个问题：
我的第一个问题是...此方法需要几秒钟的时间才能从json连接并检索数据，但是我的程序似乎没有等待并继续播放代码的下一行并同时运行getData()时间错了。我需要首先获取一些字符串，然后播放下一个代码。
我的第二个问题是，如果应用程序无法连接到json，我想再次调用getData()两次。如果连接成功，则可以使用布尔值isupdated来检查此值，该布尔值在getData()内部具有真实值。但是，再次调用方法getData()并等待它完成是不可能的。
这些方法都无济于事：
for(int x =0 , x<3 , x++ )
{
if(!jsonfetch.isupdated) {jsonfetch.getData(splash.this)}
}
或
while (!jsonfetch.isupdated){
jsonfetch.getData(splash.this);
}
条件始终为假，它会同时调用该方法，因为它不会在再次检查条件之前等待它完成...
我尝试了很多解决方案，例如将getData()放在线程上并调用join()，但它没有等待。我也尝试过AsyncTask，但它在方法结束之前调用了onPostExecute()，我不理解。
以下是getData（）代码
public static void getData(final Context context) {
handleSSLHandshake();
requestQueue = Volley.newRequestQueue(context.getApplicationContext());
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, encryption.URL_main(), null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
Log.i("update_statut","Start Fetch .");
popup_msg = jsonfect_Decryption(response.getString(encryption.epopup_msg));
banner = jsonfect_Decryption(response.getString(encryption.ebanner));
banner2= jsonfect_Decryption(response.getString(encryption.ebanner2));
interstitial = jsonfect_Decryption(response.getString(encryption.einterstitial));
interstitial_Inside = jsonfect_Decryption(response.getString(encryption.einterstitial_Inside));
youtube_url = jsonfect_Decryption(response.getString(encryption.eyoutube_url));
dialog_check = Boolean.parseBoolean(jsonfect_Decryption(response.getString(encryption.dialog_check)));
dialog_Image_URL =jsonfect_Decryption(response.getString(encryption.dialog_Image_URL));
dialog_URL = jsonfect_Decryption(response.getString(encryption.dialog_URL));
dialog_txt= jsonfect_Decryption(response.getString(encryption.dialog_msg));
dialog_canceble= Boolean.parseBoolean(jsonfect_Decryption(response.getString(encryption.dialog_canceble)));
m3u_app_url = jsonfect_Decryption(response.getString(encryption.edownload_appurl));
premium_url = jsonfect_Decryption(response.getString(encryption.emuimerp));
premium_msg = jsonfect_Decryption(response.getString(encryption.epremium_msg));
online_version=response.getString("ON_version");
updated_version=response.getString("UP_version");
url_version = jsonfect_Decryption(response.getString(encryption.eurl_version));
activation = response.getString("act");
isupdated=true;
Log.i("update_statut","Ending Fetch .");
} catch (JSONException e) {
e.printStackTrace();
Log.i("json",""+e.getMessage());
isupdated=false;
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.i("json",""+error.getMessage());
isupdated=false;
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
HashMap<String, String> params = new HashMap<String, String>();
params.put("Content-Type", "application/json");
String creds = String.format("%s:%s",encryption.USERNAME(),encryption.Password());
String auth = "Basic " + Base64.encodeToString(creds.getBytes(), Base64.DEFAULT);
params.put("Authorization", auth);
return params;
}
};
requestQueue.add(jsonObjectRequest);
}
以下是飞溅活动
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Fabric.with(this, new Crashlytics());
setContentView(R.layout._splash_java);
/// Start Animation
circle=(ImageView)findViewById(R.id.img_circle);
textView2=(TextView) findViewById(R.id.textView2);
txtwelcome=(TextView) findViewById(R.id.txtwelcome);
relativeLayout=(RelativeLayout)findViewById(R.id.relativelayout);
startAnimation();
// GET DATABASE DATA
while (!jsonfetch.isupdated){
jsonfetch.getData(splash.this);
}
// Check Version
onlineVersion = jsonfetch.online_version;
updatedVersion = jsonfetch.updated_version;
try {
currentVersion = splash.this.getPackageManager()
.getPackageInfo(splash.this.getPackageName(), 0).versionName;
} catch (PackageManager.NameNotFoundException e) {
Log.d("update_statut", "currentVersion value is " + e.getMessage());
}
if ( onlineVersion == null || updatedVersion == null || onlineVersion.equals("null") || updatedVersion.equals("null") ) {
Log.d("update_statut", "online_Version or updated_Version issue");
Log.d("update_statut", "Current version " + currentVersion + " & Online version " + onlineVersion + " & Updated version " + updatedVersion);
check_version = true;
jsonfetch.isupdated = false;
} else if ((currentVersion.equals(onlineVersion))) {
Log.d("update_statut", "match");
Log.d("update_statut", "Current version " + currentVersion + " & Online version " + onlineVersion);
check_version = true;
Interstitial_LOAD();
} else if ((currentVersion.equals(updatedVersion))) {
Log.d("update_statut", "match");
Log.d("update_statut", "Current version " + currentVersion + " & Updated version " + updatedVersion);
check_version = true;
Interstitial_LOAD();
} else {
Log.d("update_statut", "doesn't match");
Log.d("update_statut", "Current version " + currentVersion + " & Online version " + onlineVersion);
check_version = false;
}
/// Load Next Activity after 5s so that Interstitial can be loaded
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
if( (!check_version) && jsonfetch.isupdated){
update_dialog();
Log.d("update_statut", "Update dialog ");
} else {
Interstitial_SHOW();
}
}
}, 5000);
}
private void Interstitial_LOAD() {
String inter_code = jsonfetch.interstitial;
if ( inter_code!=null && !(inter_code.equals("null") || inter_code.equals("") ) ){
AdRequest adRequestI = new AdRequest.Builder().build();
interstitial = new InterstitialAd(this);
interstitial.setAdUnitId(inter_code);
interstitial.loadAd(adRequestI);
}
}
private void Interstitial_SHOW() {
String inter_code = jsonfetch.interstitial;
if ( inter_code!=null && !(inter_code.equals("null") || inter_code.equals("") ) )
{
if (interstitial.isLoaded())
{
interstitial.show();
interstitial.setAdListener(new AdListener(){
@Override
public void onAdClosed() {
startActivity(new Intent(splash.this, first_java.class).setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION));
splash.this.finish();
}
});
}
else
{
startActivity(new Intent(splash.this, first_java.class).setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION));
splash.this.finish();
}
}
else {
startActivity(new Intent(splash.this, first_java.class).setFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION));
splash.this.finish();
}
}
答案 0 :(得分：0)
关于您的第一次关注...
如果要暂停，请使用 java.util.concurrent.TimeUnit：
TimeUnit.SECONDS.sleep（1）;
睡觉一秒钟或更长时间
TimeUnit.MINUTES.sleep（1）;