首页 \ 问答 \ 在Firebase数据库中单击AlertDialog以setValue时出错(Error when clicking AlertDialog to setValue at Firebase database)

在Firebase数据库中单击AlertDialog以setValue时出错(Error when clicking AlertDialog to setValue at Firebase database)

 我试图在AlertDialog中选择一个选项，但它显示一个错误。 以下是错误：  
10-17 00:54:44.765 25600-25600/com.example.jingwen.bluetoothlowenergy E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.jingwen.bluetoothlowenergy, PID: 25600
java.lang.IndexOutOfBoundsException: Invalid index 1, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.example.jingwen.bluetoothlowenergy.MainActivity$1$1.onClick(MainActivity.java:325)
at android.support.v7.app.AlertController$AlertParams$3.onItemClick(AlertController.java:959)
at android.widget.AdapterView.performItemClick(AdapterView.java:300)
at android.widget.AbsListView.performItemClick(AbsListView.java:1143)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3063)
at android.widget.AbsListView$3.run(AbsListView.java:3881)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5237)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
 
 这是发生错误的代码，特别是Firebase数据库的setValue部分：  
 
  
  private void alertdialog()
    {
        final CharSequence peers[] = new CharSequence[] {"Home", "School", "Children"};
        stopScan();
        final String uid = firebaseAuth.getCurrentUser().getUid();
        if(alert11!=null && alert11.isShowing()) return;
        AlertDialog.Builder builder1 = new AlertDialog.Builder(this);
        builder1.setMessage("Add this device to peer list?");
        builder1.setCancelable(true);

        builder1.setNegativeButton(
                "Yes",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        AlertDialog.Builder pbuilder = new AlertDialog.Builder(MainActivity.this);
                        pbuilder.setTitle("Set peer as:");
                        pbuilder.setCancelable(false);
                        pbuilder.setItems(peers, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // the user clicked on option[which]
                                if(which == 0) {
                                    databaseRef.child("users").child(uid).child("Peer list").child(mBTDevicesArrayList.get(post).getAddress()).setValue("Home");
                                    Toast.makeText(MainActivity.this,"Set peer as 'Home'",Toast.LENGTH_SHORT).show();
                                    Toast.makeText(MainActivity.this,"Peer list updated!",Toast.LENGTH_SHORT).show();
                                }
                                if(which == 1) {
                                    databaseRef.child("users").child(uid).child("Peer list").child(mBTDevicesArrayList.get(post).getAddress()).setValue("School");
                                    Toast.makeText(MainActivity.this,"Set peer as 'School'",Toast.LENGTH_SHORT).show();
                                    Toast.makeText(MainActivity.this,"Peer list updated!",Toast.LENGTH_SHORT).show();
                                }
                                if(which == 2) {
                                    databaseRef.child("users").child(uid).child("Peer list").child(mBTDevicesArrayList.get(post).getAddress()).setValue("Children");
                                    Toast.makeText(MainActivity.this,"Set peer as 'Children'",Toast.LENGTH_SHORT).show();
                                    Toast.makeText(MainActivity.this,"Peer list updated!",Toast.LENGTH_SHORT).show();
                                }
                            }
                        });
                        pbuilder.show();

                    }
                }); 
  
 
 
 请告诉我是否有更多部分代码需要显示。 

I tried to select an option at AlertDialog but it shows an error. Below is the error: 
10-17 00:54:44.765 25600-25600/com.example.jingwen.bluetoothlowenergy E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.jingwen.bluetoothlowenergy, PID: 25600
java.lang.IndexOutOfBoundsException: Invalid index 1, size is 0
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.example.jingwen.bluetoothlowenergy.MainActivity$1$1.onClick(MainActivity.java:325)
at android.support.v7.app.AlertController$AlertParams$3.onItemClick(AlertController.java:959)
at android.widget.AdapterView.performItemClick(AdapterView.java:300)
at android.widget.AbsListView.performItemClick(AbsListView.java:1143)
at android.widget.AbsListView$PerformClick.run(AbsListView.java:3063)
at android.widget.AbsListView$3.run(AbsListView.java:3881)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5237)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
 
This is the code where the error occurs, specifically the setValue part to Firebase database :  
 
  
  private void alertdialog()
    {
        final CharSequence peers[] = new CharSequence[] {"Home", "School", "Children"};
        stopScan();
        final String uid = firebaseAuth.getCurrentUser().getUid();
        if(alert11!=null && alert11.isShowing()) return;
        AlertDialog.Builder builder1 = new AlertDialog.Builder(this);
        builder1.setMessage("Add this device to peer list?");
        builder1.setCancelable(true);

        builder1.setNegativeButton(
                "Yes",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        AlertDialog.Builder pbuilder = new AlertDialog.Builder(MainActivity.this);
                        pbuilder.setTitle("Set peer as:");
                        pbuilder.setCancelable(false);
                        pbuilder.setItems(peers, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                // the user clicked on option[which]
                                if(which == 0) {
                                    databaseRef.child("users").child(uid).child("Peer list").child(mBTDevicesArrayList.get(post).getAddress()).setValue("Home");
                                    Toast.makeText(MainActivity.this,"Set peer as 'Home'",Toast.LENGTH_SHORT).show();
                                    Toast.makeText(MainActivity.this,"Peer list updated!",Toast.LENGTH_SHORT).show();
                                }
                                if(which == 1) {
                                    databaseRef.child("users").child(uid).child("Peer list").child(mBTDevicesArrayList.get(post).getAddress()).setValue("School");
                                    Toast.makeText(MainActivity.this,"Set peer as 'School'",Toast.LENGTH_SHORT).show();
                                    Toast.makeText(MainActivity.this,"Peer list updated!",Toast.LENGTH_SHORT).show();
                                }
                                if(which == 2) {
                                    databaseRef.child("users").child(uid).child("Peer list").child(mBTDevicesArrayList.get(post).getAddress()).setValue("Children");
                                    Toast.makeText(MainActivity.this,"Set peer as 'Children'",Toast.LENGTH_SHORT).show();
                                    Toast.makeText(MainActivity.this,"Peer list updated!",Toast.LENGTH_SHORT).show();
                                }
                            }
                        });
                        pbuilder.show();

                    }
                }); 
  
 
 
Do tell me if there are more parts of the codes need to be shown.

原文：https://stackoverflow.com/questions/40073000

更新时间：2022-04-13 20:04

最满意答案

 我不知道那里发生了什么（我只是用高度压缩的gzip文件重现了缓慢），但是一次解压缩的速度更快，如下所示：  
def decompress(io, int_size = 3)
    array = Array.new(262144)
    i = 0
    io.rewind
    gz = Zlib::GzipReader.new(io)
    dec = gz.read
    seq = StringIO.new(dec, "rb")
    until seq.eof?
        buffer = seq.read(int_size)
        array[i] = buffer.unpack('C*').inject { |r, n| r << 8 | n }
        i += 1
    end
    array
end
 
 更快的还是使用map而不是循环：  
def decompress(io, int_size = 3)
    io.rewind
    gz = Zlib::GzipReader.new(io)
    dec = gz.read
    dec.unpack('C*').each_slice(int_size).to_a.map {|t| t.inject {|r,n| r << 8 | n}}
end

I'm not sure what's going on there (I reproduced the slowness only with a highly compressed gzip file), but decompressing all at once is faster, something like this: 
def decompress(io, int_size = 3)
    array = Array.new(262144)
    i = 0
    io.rewind
    gz = Zlib::GzipReader.new(io)
    dec = gz.read
    seq = StringIO.new(dec, "rb")
    until seq.eof?
        buffer = seq.read(int_size)
        array[i] = buffer.unpack('C*').inject { |r, n| r << 8 | n }
        i += 1
    end
    array
end
 
Faster still would be to use map instead of a loop: 
def decompress(io, int_size = 3)
    io.rewind
    gz = Zlib::GzipReader.new(io)
    dec = gz.read
    dec.unpack('C*').each_slice(int_size).to_a.map {|t| t.inject {|r,n| r << 8 | n}}
end

在Firebase数据库中单击AlertDialog以setValue时出错(Error when clicking AlertDialog to setValue at Firebase database)

最满意答案

相关问答

在Clojure中解压缩zlib流(Decompress zlib stream in Clojure)[2021-07-12]

Lua：如何在内存中gzip字符串（gzip，而不是zlib）？(Lua: How to gzip a string (gzip, not zlib) in memory?)[2023-07-06]

使用zlib解压缩PNG(Decompress PNG using zlib)[2023-10-02]

如何在Ruby中解压缩Gzip字符串？(How to decompress Gzip string in ruby?)[2022-08-19]

如何使用zlib解压缩gzip流？(How can I decompress a gzip stream with zlib?)[2023-03-22]

Ruby：解压缩zlib包装的deflate数据(Ruby: uncompress zlib-wrapped deflate data)[2023-10-26]

不是用gzip格式（Zlib :: GzipFile :: Error） - 在Ruby中解压缩gzip文件(not in gzip format (Zlib::GzipFile::Error) - while decompressing the gzip file in Ruby)[2022-07-22]

使用Zlib压缩ruby中的大文件以获取gzip(Compress large file in ruby with Zlib for gzip)[2022-05-26]

Ruby zlib库解压缩gzip文件非常慢(Ruby zlib Library Very Slow to Decompress gzip File)[2023-07-04]

Delphi ZLib压缩/解压缩(Delphi ZLib Compress / Decompress)[2022-11-19]

相关文章

最新问答