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在我的項目中啓用ProGuard之後，我的應用程序正常工作，應用程序在'release'和'debug'apk中立即崩潰。我也禁用了proguard，並再次嘗試它，它的工作原理。通過在Android中實現Proguard，使用JDBC執行Asynctask中的應用程序崩潰
現在我的問題是如何在我的項目中使用jdbc以及proguard，這有可能嗎？
這裏是我的調試什麼
E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
Process: com.example.aileen.rotaractclub, PID: 6131
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:309)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.ExceptionInInitializerError
at com.b.a.bq.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:179)
at java.sql.DriverManager.getConnection(DriverManager.java:213)
at com.example.aileen.rotaractclub.b.a.a(Unknown Source)
at com.example.aileen.rotaractclub.b.a$c.a(Unknown Source)
at com.example.aileen.rotaractclub.b.a$c.doInBackground(Unknown Source)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.RuntimeException: java.lang.NoSuchMethodException: <init> [class java.lang.String, int, class java.util.Properties, class java.lang.String, class java.lang.String]
at com.b.a.o.<clinit>(Unknown Source)
at com.b.a.bq.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:179)
at java.sql.DriverManager.getConnection(DriverManager.java:213)
at com.example.aileen.rotaractclub.b.a.a(Unknown Source)
at com.example.aileen.rotaractclub.b.a$c.a(Unknown Source)
at com.example.aileen.rotaractclub.b.a$c.doInBackground(Unknown Source)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by: java.lang.NoSuchMethodException: <init> [class java.lang.String, int, class java.util.Properties, class java.lang.String, class java.lang.String]
at java.lang.Class.getConstructor(Class.java:528)
at java.lang.Class.getConstructor(Class.java:492)
at com.b.a.o.<clinit>(Unknown Source)
at com.b.a.bq.connect(Unknown Source)
at java.sql.DriverManager.getConnection(DriverManager.java:179)
at java.sql.DriverManager.getConnection(DriverManager.java:213)
at com.example.aileen.rotaractclub.b.a.a(Unknown Source)
at com.example.aileen.rotaractclub.b.a$c.a(Unknown Source)
at com.example.aileen.rotaractclub.b.a$c.doInBackground(Unknown Source)
at android.os.AsyncTask$2.call(AsyncTask.java:295)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
這裏是我的AsyncTask
//Deleting Announcement
public class deleting extends AsyncTask<String,String,String> {
Boolean Connection = false;
Boolean isSuccess = false;
ProgressDialog progress;
String title;
String ids;
public deleting(String aydi,String titulo)
{
ids=aydi;
title =titulo;
}
@Override
protected void onPreExecute()
{
super.onPreExecute();
progress = new ProgressDialog(getActivity());
progress.setTitle("Synchronizing");
progress.setMessage("Removing '"+ title +"'\n announcement please wait...");
progress.setIndeterminate(false);
progress.setProgressStyle(android.R.style.Widget_ProgressBar_Small);
progress.show();
progress.setCancelable(false);
}
@Override
protected String doInBackground(String... params) {
try {
try {
connection = connectionclass(secured_Pref.getString("server",""), secured_Pref.getString("user",""), secured_Pref.getString("pass",""));
if (connection == null) {
Connection = false;
}
else
{
Connection = true;
PreparedStatement statement = connection.prepareStatement("DELETE FROM Announcements WHERE ID='"+this.ids.toString()+"' AND Title='"+this.title.toString()+"'");
long i =statement.executeUpdate();
try {
if (i>0)
{
isSuccess = true;
} else {
isSuccess = false;
}
connection.close();
} catch (Exception x) {
Toast.makeText(getActivity(), "Error Occur.", Toast.LENGTH_SHORT).show();
}
}
} catch (Exception e)
{
e.printStackTrace();
Toast.makeText(getActivity(), "Error Occur.", Toast.LENGTH_SHORT).show();
}
} catch (Exception ex) {
isSuccess = false;
}
return null;
}
@Override
protected void onPostExecute(String r) {
super.onPostExecute(r);
if (Connection)
{
Toast.makeText(getActivity(),"Successfully Connected.",Toast.LENGTH_LONG).show();
}
else if(Connection==false)
{
Toast.makeText(getActivity(),"No Internet Connection.",Toast.LENGTH_LONG).show();
}
if (isSuccess)
{
Snackbar.make(getView(), "Announcement is Successfully Removed.", Snackbar.LENGTH_LONG).show();
//Refresh my fragment
FragmentTransaction refresh = getFragmentManager().beginTransaction();
refresh.detach(ViewAnnounce.this).attach(ViewAnnounce.this).commit();
}
else
{
Snackbar.make(getView(), "Oops! Error Occur.", Snackbar.LENGTH_LONG).show();
}
progress.dismiss();
}
}
ProGuard的規則
-ignorewarnings
# Basic ProGuard rules for Firebase Android SDK 2.0.0+
-keep class com.firebase.** { *; }
-keep class org.apache.** { *; }
-keepnames class com.fasterxml.jackson.** { *; }
-keepnames class javax.servlet.** { *; }
-keepnames class org.ietf.jgss.** { *; }
-dontwarn org.apache.**
-dontwarn org.w3c.dom.**
-renamesourcefileattribute SourceFile
-keep public class * extends android.app.Application
-optimizationpasses 5
-keepattributes *Annotation*,EnclosingMethod
在我的搖籃
buildTypes {
release {
minifyEnabled true
shrinkResources true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
debug {
debuggable true
minifyEnabled true
shrinkResources true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
這裏已經固定在我的連接嘗試什麼{ 調用Class.forName （ 「com.mysql.jdbc.Driver」）; connection = DriverManager.getConnection（url，user，password）; （「error here 1：」，se.getMessage（））; （錯誤在這裏2：「，e.getMessage（））; （例如e） } catch（Exception e） Log.e（「error here 3：」，e.getMessage（））; } – ArcherEmiya
忘記包括抱歉，連接連接=空; – ArcherEmiya