通过在Android中实现Proguard，使用JDBC在Asynctask中崩溃 _AsyncTask

仓廪实则知礼节，衣食足则知荣辱。这篇文章主要讲述通过在Android中实现Proguard，使用JDBC在Asynctask中崩溃相关的知识，希望能为你提供帮助。
我的应用程序之前工作正常，但在我的项目中启用ProGuard后，应用程序立即在“release”和“debug”apk中崩溃。我也禁用proguard并再次尝试它，它的工作原理。
现在我的问题是如何在我的项目中使用jdbc以及proguard，这可能吗？
这是我的调试

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)

这是我的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 +"' 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规则

-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Gradle中

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' } }

答案【通过在Android中实现Proguard，使用JDBC在Asynctask中崩溃】已经通过将此规则包含在我的程序中来修复